Patent Publication Number: US-11657714-B2

Title: Enhanced travel modes for vehicles

Description:
This application claims priority to and is a continuation of U.S. patent application Ser. No. 15/727,234, filed on Oct. 6, 2017, the entire contents of which are incorporated herein by reference. 
    
    
     BACKGROUND 
     Vehicles may be used to transport people between different locations. Normal driving procedures may include maneuvering the vehicle within the confines of a lane, maneuvering around turns in the road, safely passing through intersections, as well as complying with traffic laws. In most scenarios, all vehicles traveling on a road may be given equal priority in order to reach their respective destinations. In such scenarios, all vehicles may be controlled so as to maximize the efficiency of traffic flow on the road and/or on portions of a road network. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identify the figure in which the reference number first appears. The same reference numbers in different figures indicate similar or identical items. 
         FIG.  1    is a schematic diagram of an example environment through which an example vehicle travels along a road of a road network. As shown in  FIG.  1   , such a vehicle may include a preferential travel input device configured to enable a passenger of the vehicle to request a prioritized path or other preferential travel benefits when traveling to a particular destination. 
         FIG.  2    is a block diagram illustrating an example vehicle system architecture. 
         FIG.  3    is a block diagram illustrating an example vehicle control system architecture useful for interacting with vehicles remotely. 
         FIGS.  4   a  and  4   b    are schematic views of a portion of an example road network in which example vehicles are traveling along respective paths. In such examples, at least one of the vehicles may be traveling along a prioritized path to a particular destination. 
         FIGS.  5   a  and  5   b    are additional schematic views of a portion of an example road network in which example vehicles are traveling along respective paths. 
         FIGS.  6   a  and  6   b    are further schematic views of a portion of an example road network in which example vehicles are traveling along respective paths. 
         FIGS.  7   a  and  7   b    are still further schematic views of a portion of an example road network in which example vehicles are traveling along respective paths. 
         FIG.  8    is a flow diagram of an example method for operating one or more vehicles traveling in an example road network. Such an example method may include determining and providing one or more sets of parameters governing operation of one or more vehicles while the vehicles travel to respective destinations. 
     
    
    
     DETAILED DESCRIPTION 
     This disclosure is generally directed to facilitating interaction between a vehicle, such as a driverless vehicle, a remotely located vehicle control system, one or more other vehicles, and/or one or more other devices (e.g., traffic signals, signs, barriers, bridges, etc.). As mentioned above, such a vehicle traveling on a road of a road network, from a first location to a particular destination at a second location, may require or request preferential travel for a variety of reasons. For example, the vehicle and/or a passenger thereof may be part of a travel program or other premium service in which prioritized or preferential travel is a benefit. A passenger of the vehicle may also request preferential travel in emergency situations or in other time-sensitive situations. In such circumstances, for example, the passenger may provide a touch input, a voice input, a gesture input, and/or other input via a preferential travel input device of the vehicle. The preferential travel input device may be operably connected to a vehicle controller configured to process such an input, and to provide a signal indicative of such an input to the remotely located vehicle control system. The input may additionally or alternatively be provided to the vehicle controller by one or more applications operable on a mobile phone, tablet, laptop computer, or other electronic device, and in such examples, such electronic devices may comprise a preferential travel input device. In still further examples, such preferential travel may be a preset user setting and/or a subscription-based service associated with the vehicle and/or the user. In such examples, the vehicle may automatically be granted preferential travel once the passenger enters the vehicle and/or once the vehicle is turned on. Additionally, the passenger may be granted preferential travel upon paying a subscription fee and/or upon paying a one-time fee upon requesting preferential travel. 
     As will be described in greater detail below, during normal operations, the vehicle may travel and/or otherwise operate according to a set of nominal operating parameters or parameters, and such operating parameters may be adjusted if preferential travel is requested by a passenger of the vehicle. For example, upon receiving a request from the passenger, the vehicle controller may provide a signal indicative of a request for preferential travel to the remote vehicle control system via one or more wireless networks. Based at least partly on such a request, the remote vehicle control system may determine a set of parameters that includes modifications to the nominal operating parameters currently governing operation of the vehicle from which the request for preferential travel originated (e.g., a “requesting vehicle”). Such a set of modified parameters may include, for example, a new/modified speed threshold below which the requesting vehicle may be permitted and, in some situations, required to operate, a new/modified drive line along which the requesting vehicle may be permitted and, in some situations, required to travel, a new/modified drive envelope along which or within which the requesting vehicle may be permitted and, in some situations, required to travel, new/modified traffic rules (e.g., rules governing vehicle operation with regard to stop signs, traffic lights, no passing zones, school zones, or other areas) with which the requesting vehicle must abide, and/or other new/modified rules or limitations for operating the requesting vehicle within the road network. 
     In some examples, the set of parameters may include road network data and/or other information that may be used by a vehicle controller of the requesting vehicle to generate a drive envelope that defines a prioritized path along which the requesting vehicle may travel between the vehicle&#39;s current location in the road network to the desired destination. Alternatively, such a set of new/modified parameters may identify, define, and/or include such a prioritized path. Such a prioritized path may include a path in which none of the additional vehicles, or a limited number of additional vehicles, in the road network are disposed within a drive envelope of the requesting vehicle as the requesting vehicle travels to the destination. In some examples, the prioritized path may be selected and/or otherwise determined based at least in part on the fact that no other vehicles are present within such a drive envelope. Additionally or alternatively, the additional vehicles in the road network may be actively controlled to avoid the trajectory of the requesting vehicle. In such examples, the signal provided to the remote vehicle control system by the vehicle controller may include sensor information and/or other information indicative of the requesting vehicle&#39;s current location. The signal may also include an address, global positioning coordinates, and/or other indication of the desired destination. The signal may further include an identifier uniquely identifying the requesting vehicle, an additional identifier uniquely identifying one or more passengers of the requesting vehicle, and/or other information related to the request. Further, in any of the examples described herein, such a “drive envelope” may be defined as a preferred area on which the vehicle should drive to reach a destination having an extent along a direction of travel associated with a distance the vehicle may traverse in a fixed period of time (e.g., according to a receding horizon technique) or a specified finite distance. For example, such a drive envelope may extend a length along a drive segment, line, and/or route along which the requesting vehicle may be controlled to travel for approximately 10 seconds. Alternatively, such a drive envelope may extend a fixed distance, e.g. 500 feet, in the direction of a line and/or route along which the requesting vehicle may be controlled to travel. Such a “drive envelope” may comprise a drive line indicating an ideal line for the vehicle to follow within the drive envelope. As used herein, a trajectory may be a selected subset of the “drive envelope” in which the vehicle actually traverses, or is selected to traverse. It is understood that the finite period of time and finite distance noted above are merely examples and, in further embodiments, such finite periods of time and finite distances may be greater than or less than those noted above. 
     In such examples, and based at least in part on the request, one or more computing devices of the remote vehicle control system may determine a first set of parameters associated with the requesting vehicle as well as one or more additional sets of parameters associated with the remaining vehicles in the road network. The first set of parameters may require that the requesting vehicle travel along a prioritized path from the vehicle&#39;s current location to the particular destination. Such a prioritized path may be configured such that none of the additional vehicles in the road network are disposed within one or more drive envelopes (e.g., a series of consecutive drive envelopes) of the requesting vehicle as the requesting vehicle travels to the destination. The additional sets of parameters may require that the remaining vehicles in the road network remain outside of the prioritized path of the requesting vehicle. For example, a second set of parameters provided to a second vehicle traveling in the road network may require that the second vehicle remain outside of the trajectory of the requesting vehicle as the requesting vehicle travels to a destination. Further, in some examples the signal sent to the remote vehicle control system by the requesting vehicle may identify an area, zone, radius, and/or other location that is to be avoided by the additional vehicles in the road network (e.g., a temporary non-entry zone) when the requesting vehicle is disposed proximate and/or within such a location. In such examples, such locations may be identified in the one or more additional sets of parameters determined by the remote vehicle control system. 
     Additionally, while some embodiments of the present disclosure relate to centralized control examples in which signals are provided to a remote vehicle control system and in which the remote vehicle control system determines one or more sets of parameters based at least in part on such signals, in other embodiments, such a remote vehicle control system may be omitted. For example, in additional decentralized control embodiments the vehicle controller of the requesting vehicle may provide a signal indicative of a request for preferential travel to the respective vehicle controllers of one or more of the additional vehicles located in the road network via the one or more wireless networks. In such embodiments, the vehicle controller of the requesting vehicle may determine a first set of parameters including, among other things, a prioritized path for the requesting vehicle to travel along. As noted above, such a prioritized path may include one or more drive envelopes and/or trajectories, and none of the additional vehicles may be disposed within or along such drive envelopes and/or trajectories as the requesting vehicle travels along the prioritized path to the destination. Additionally, based at least partly on such a request, the vehicle controllers of the additional vehicles may determine additional respective sets of parameters for operating the corresponding vehicles. Such additional sets of parameters require that each of the additional vehicles remain outside of the one or more trajectories of the prioritized path as the requesting vehicle travels to the destination. In some examples, one or more of the additional vehicles and/or owners or passengers of the additional vehicles may be compensated for operating in accordance with such additional respective sets of parameters and/or for otherwise facilitating the preferential travel of the requesting vehicle. For example, as part of requesting preferential travel and/or as a requirement for being granted preferential travel, a passenger of the requesting vehicle may pay a corresponding fee. In such examples, at least a portion of the fee may be distributed to an owner or passenger of one or more of the remaining vehicles within the road network whose travel is hindered, de-prioritized and/or otherwise affected by the requesting vehicle being granted preferential or prioritized travel. The techniques and systems described herein may be implemented in a number of ways. Example implementations are provided below with reference to the figures. 
       FIG.  1    is a schematic diagram of an example environment  100  through which an example vehicle  102  travels. The example environment  100  includes a road network  104  including a plurality of example roads  106  having two pairs  108  of lanes  110   a ,  110   b  separated by a median or double-yellow line  112 . For example, a first lane  110   a , a second lane  110   b , and/or one or more additional lanes may be at least partially defined by a lane dividing line  114  and/or a lane boundary line  116 . The example road  106  also includes shoulders  118  located on opposite sides of the road  106 .  FIG.  1    also shows an example geographic location  120  associated with a departure location including a structure  122 , such as a house or building, and an example destination  124  also including a structure  126 , such as a house or building. The road network  104  provides a number of roads  106  defining a path between the geographic location  120  and the destination  124 , and  FIG.  1    shows an enlarged view of a portion of an example road  106 . The road network  104  may include a number of features, such as curves, intersections with cross-roads, crosswalks, traffic signs, traffic lights, railroad crossings, bridges, traffic circles, directional arrows, etc. 
     As shown in  FIG.  1   , the example vehicle  102  may travel through the example environment  100  via the road network  104  according to a path extending from the geographic location  120  to the particular destination  124 . For the purpose of illustration, the vehicle  102  may be a driverless vehicle, such as an autonomous vehicle configured to operate according to a Level 5 classification issued by the U.S. National Highway Traffic Safety Administration, which describes a vehicle capable of performing all safety-critical functions for the entire trip, with the driver (or occupant) not being expected to control the vehicle at any time. In that case, since the vehicle  102  may be configured to control all functions from start to completion of the trip, including all parking functions, it may not include a driver. This is merely an example, and the systems and methods described herein may be incorporated into any ground-borne, airborne, or waterborne vehicle, including those ranging from vehicles that need to be manually controlled by a driver at all times, to those that are partially or fully autonomously controlled. 
     The example vehicle  102  shown in  FIG.  1    is an automobile having four wheels  128  and respective tires for each of the wheels  128 . Other types and configurations of vehicles are contemplated, such as, for example, vans, sport utility vehicles, cross-over vehicles, trucks, buses, agricultural vehicles, and construction vehicles. The vehicle  102  may be powered by one or more internal combustion engines, one or more electric motors, hydrogen power, any combination thereof, and/or any other suitable power sources. In addition, although the example vehicle  102  has four wheels  128 , the systems and methods described herein may be incorporated into vehicles having fewer or a greater number of wheels, tires, and/or tracks. The example vehicle  102  has four-wheel steering and may operate generally with equal performance characteristics in all directions, for example, such that a first end  130  of the vehicle  102  is the front end of the vehicle  102  when travelling in a first direction  132 , and such that the first end  130  becomes the rear end of the vehicle  102  when traveling in the opposite, second direction  134 , as shown in  FIG.  1   . Similarly, a second end  136  of the vehicle  102  is the front end of the vehicle  102  when travelling in the second direction  134 , and such that the second end  136  becomes the rear end of the vehicle  102  when traveling in the opposite, first direction  132 . These example characteristics may facilitate greater maneuverability, for example, in small spaces or crowded environments, such as parking lots and urban areas. 
     In the example shown in  FIG.  1   , and as will be explained in greater detail below, the vehicle  102  may use various sensors and a vehicle controller to autonomously operate through the environment  100  along a path via the road network  104 . For example, the vehicle controller may be configured to determine a drive envelope  138  defined by virtual boundaries  140  within which the vehicle  102  may travel. For example, the drive envelope  138  may have a variable envelope width  142  in the width direction of the vehicle  102 , and a variable envelope length  144  extending in the direction of travel of the vehicle  102 . In some examples, the virtual boundaries  140  of the drive envelope  138  may be determined based at least in part on sensor data received from sensors associated with the vehicle  102  and/or road network data received by the vehicle  102  via a road network data store, as explained in more detail herein. In some examples, the vehicle  102  may travel along a drive line  146  within the drive envelope  138 . In such examples, the drive line  146  may extend approximately centrally through the drive envelope  138 , and the drive envelope  138  may define at least part of the path along which the vehicle  102  travels to reach the particular destination  124 . For example, the path along which the vehicle  102  travels may be approximately as wide as the vehicle  102  and/or the envelope width  142 . In some examples, the drive line  146  may be, or may be used to determine, a trajectory along which the vehicle  102  may follow to achieve the desired path. Such a trajectory may be determined by, substantially simultaneously, generating a plurality of trajectories and selecting one of the trajectories which is best able to achieve the path. In such examples, the trajectory may be calculated in accordance with a receding horizon technique such that the trajectory only provides commands for a particular time window (e.g. less than 10 seconds) and is recalculated at a certain frequency (e.g. 10 Hz, 30 Hz, etc.). 
     The vehicle  102  may also include a preferential travel input device  148  and a preferential travel output device  150 . Shown schematically in  FIG.  1   , the preferential travel input device  148  and the preferential travel output device  150  may comprise separate respective devices or components of the vehicle  102 . Alternatively, the preferential travel input device  148  and the preferential travel output device  150  may comprise a single input/output device. The preferential travel input device  148  may be configured to assist a passenger with requesting preferential travel to the destination  124  and, in particular, with requesting a set of parameters governing operation of the vehicle  102  as the vehicle travels to the destination  124 . Such a set of parameters may include, for example, road network data, global positioning information, traffic rules, and/or other information that may be utilized as inputs to a vehicle controller of the vehicle  102 . In such examples, the vehicle controller of the vehicle  102  may generate and/or otherwise determine a drive envelope including a drive line  146 . As noted above, in any of the examples described herein, such a drive line  146  may be, or may be used to determine, one or more trajectories (e.g., a series of consecutive trajectories) along which the vehicle  102  may travel. In this way, the drive line  146  and/or the one or more trajectories may define a prioritized path extending from the vehicle  102  to the destination  124 . In additional examples, the set of parameters may define and/or otherwise include a drive envelope that includes and/or otherwise defines the prioritized path. 
     In some examples, the preferential travel input device  148  may comprise a button, switch, knob, lever, or other component of the vehicle  102  configured to receive a manual, physical, or touch input from a passenger. Such a preferential travel input device  148  may also comprise one or more touch screen displays, physical keyboards, virtual keyboards (e.g., a keyboard displayed via a touch screen or other display device), or other user interface devices of the vehicle  102  configured to receive such input. In still further examples, the preferential travel input device  148  may comprise one or more microphones configured to receive voice commands or other audible input from the passenger, and/or one or more cameras configured to receive visual or gesture input. In such examples, the vehicle controller may include voice recognition functionality, gesture recognition functionality, or other such capabilities in order to process inputs received via the preferential travel input device  148 . In any of the examples described herein, the preferential travel output device  150  may comprise a speaker, a display (e.g., a touch screen display), a heads-up display, and/or other such device configured to display, announce, and/or otherwise output at least part of a prioritized path along which the vehicle  102  may travel. The preferential travel output device  150  may include any of the components described above with respect to the preferential travel input device  148 . The preferential travel input device  148  and the preferential travel output device  150  may be operably and/or otherwise connected to the vehicle controller of the vehicle  102 . It is also understood that such inputs and/or outputs may be provided by one or more applications operable on a mobile phone, tablet, laptop computer, or other electronic device that are in communication (wirelessly or otherwise) with the vehicle  102 , and in such examples, such electronic devices may comprise a preferential travel input device  148  and/or a preferential travel output device  150 . 
     In some examples, the preferential travel input device  148  may be configured to receive an input from a passenger of the vehicle  102  indicative of a request for preferential travel, and the preferential travel input device  148  may be configured to generate and/or send a signal to the vehicle controller of the vehicle  102  containing information indicative of the request, at least partly in response to such an input. In such examples, the vehicle controller of the vehicle  102  may be communicatively and/or otherwise connected to a network  152 , and the vehicle controller may provide a corresponding signal and/or request to a remote vehicle control system  154  via the network  152 . In any of the examples described herein, a request for preferential travel may comprise a request for a prioritized drive envelope and/or path extending from the vehicle  102  to a particular destination  124  that is accessible via the road network  104  on which the vehicle  102  is traveling. In response, the vehicle controller of the vehicle  102  may request assistance from the remote vehicle control system  154  and, in particular, may request the determination of a set of modified parameters governing operation of the vehicle  102  as the vehicle  102  travels to the particular destination  124 . Such a set of modified parameters may include, for example, an alteration of at least one of the nominal operating parameters currently governing operation of the vehicle  102 . In another example, such a set of modified parameters may include at least one additional operating parameter not included in the nominal operating parameters. In a further example, such a set of modified parameters may omit one or more of the nominal operating parameters. In some examples, the vehicle  102  may be a part of a fleet of vehicles in communication with the remote vehicle control system  154  via the network  152 . In such examples, the signal provided by the vehicle controller of the vehicle  102  may include sensor information and/or other information indicative of a current location of the vehicle  102 . The signal may also include an address, global positioning coordinates, and/or other indication of the desired destination  124 , and such information may be provided by the passenger via the preferential travel input device  148 . The signal may further include an identifier uniquely identifying the requesting vehicle  102 , an additional identifier uniquely identifying one or more passengers of the requesting vehicle  102 , and/or other information related to the request. 
     As will be explained in further detail below, at least partly in response to such a request, the remote vehicle control system  154  may determine a first set of modified parameters governing operation of the vehicle  102 . The first set of modified parameters may include a modified (e.g., prioritized) drive envelope  138  comprising a modified (e.g., prioritized) drive line  146 . As noted above, such a drive line  146  may comprise one or more trajectories (e.g., a series of consecutive trajectories) defining a prioritized path from the vehicle  102  to the destination  124 . In any of the examples described herein, the first set of modified parameters may include road network data and/or other information that may be used by the vehicle controller of the vehicle  102  to determine such a drive envelope and/or prioritized path. For example, the first set of modified parameters may also identify portions of the road network  104  which may or may not be used by the requesting vehicle  102  as the vehicle  102  travels to the destination  124 . At least partly in response to such a request, the remote vehicle control system  154  may also determine a second set of modified parameters governing operation of a second vehicle of the fleet of vehicles. Such a second set of parameters may include a modified (e.g., a reduced priority) drive envelope  138  comprising a modified (e.g., a reduced priority) drive line  146 . Such a drive line  146  may comprise one or more trajectories (e.g., a series of consecutive trajectories) defining a second path (e.g., a path of reduced priority) along which the second vehicle of the fleet of vehicles travels such that the vehicle  102  providing the request may have priority in reaching the destination  124  along the road network  104 . Alternatively, the second set of parameters may include road network data and/or other information that may be used by the vehicle controller of the second vehicle to determine such a second path (e.g., by rerouting the second vehicle to take alternate routes allowing the vehicle  102  to have less traffic on the prioritized route). In such examples, the second set of parameters may be at least partly more restrictive than the first set of parameters. For example, in accordance with the second set of parameters, the second vehicle and/or a remainder of the plurality of vehicles may be permitted and, in some situations, required to clear at least one of the first lane  110   a  or the second lane  110   b  of the road  106  such that the vehicle  102  providing the request may travel along a prioritized path (i.e., a travel path in which none of the additional vehicles in the road network are disposed within the drive envelope or along one or more trajectories of the requesting vehicle  102  as the requesting vehicle  102  travels to the particular destination  124 . In any of the examples described herein, one or more of the vehicles  102  may form a caravan and/or a motorcade as the vehicles  102  travel together in the road  106 . Further, in any of the examples described herein, one or more of the vehicles  102  may include an input/output interface or other component that enables dynamic short range communication between the respective vehicles  102 . For example, such components may enable a first vehicle  102  to communicate a first set of modified parameters, a prioritized drive envelope  138 , a prioritized drive line  146 , one or more trajectories, a prioritized path, and/or any other information described herein to one or more additional vehicles  102  traversing the road network  104  having corresponding input/output interface components. Such additional vehicles  102  may also be configured to communicate information back to the first vehicle  102 , using the corresponding input/output interface components, in response to information received from the first vehicle  102 . 
     In some examples, and as shown schematically in  FIG.  1   , the remote vehicle control system  154  may be located at a remote control center  156 , and one or more human operators  158  may also be located at the remote control center  156  in order to operate the remote vehicle control system  154 . In some examples, one or more of the operators  158  may not be human. For example, they may be computer systems leveraging artificial intelligence, machine learning, and/or other decision making strategies in order to operate the remote vehicle control system  154 . In the example shown, the operator  158  may interact with one or more vehicles  102  in the fleet of vehicles via an operator computing device  160 . The operator computing device  160  may include one or more displays  162  configured to provide the operator  158  with data related to operation of the vehicle  102 , a subset of the fleet of vehicles, and/or the fleet of vehicles. For example, the display(s)  162  may be configured to show data related to sensor signals received from the vehicles  102 , data related to the road network  104 , requests for preferential travel received from the vehicles  102 , and/or additional data or information to facilitate providing travel paths, vehicle information, directions, and/or other information or assistance to the vehicles  102 . In addition, the operator computing device  160  may include an operator input device  164  configured to allow the operator  158  to provide information to one or more of the vehicles  102 , for example, in the form of signals providing guidance to the vehicles  102 . The operator input device  164  may include one or more of a touch-sensitive screen, a stylus, a mouse, a dial, a keyboard, a keypad, and/or a gesture-input system configured to translate gestures performed by the operator  158  into input commands for the computing device  160 . As explained in more detail below, the remote vehicle control system  154  may provide one or more of the vehicles  102  with a set of modified parameters that may be used by the local vehicle controllers of the respective vehicles  102  to govern operation of the respective vehicle  102 . It is understood, however, that any of the methods and/or operations described herein with respect to the remote vehicle control system  154  may be performed by one or more of the respective vehicle controllers of the vehicles  102  traversing the road network  104 . In such examples, the remote vehicle control system  154  may be omitted and, for example, the various sets of parameters, drive envelopes, paths, drive lines, trajectories, and/or other operational parameters described herein may be determined and/or provided by at least one of the vehicle controllers. 
       FIG.  2    is a block diagram of an example architecture  200  including vehicle systems  202  for controlling operation of the systems that provide data associated with operation of the vehicle  102 , and that control operation of the vehicle  102 . Any of the components described with respect to  FIG.  2    may be incorporated into one or more of the vehicles  102  described herein. 
     In various implementations, the architecture  200  may be implemented using a uniprocessor system including one processor, or a multiprocessor system including several processors (e.g., two, four, eight, or another suitable number). The processor(s) may be any suitable processor capable of executing instructions. For example, in various implementations, the processor(s) may be general-purpose or embedded processors implementing any of a variety of instruction set architectures (ISAs), such as the x 86 , PowerPC, SPARC, or MIPS ISAs, or any other suitable ISA. In multiprocessor systems, each processor may commonly, but not necessarily, implement the same ISA. In some examples, the processor(s) may include a central processing unit (CPU), a graphics processing unit (GPU), or a combination thereof. The processor(s) may comprise a component of the vehicle controller described herein. In some examples, the processor(s) may include one or more field-programmable gate arrays, application-specific integrated circuits, microprocessors, and/or other processor components. 
     The example architecture  200  may include a non-transitory computer readable media configured to store executable instructions/modules, data, and/or data items accessible by the processor(s). In various implementations, the non-transitory computer readable media may be implemented using any suitable memory technology, such as static random access memory (SRAM), synchronous dynamic RAM (SDRAM), nonvolatile/Flash-type memory, or any other type of memory. In the illustrated implementation, program instructions and data implementing desired functions, such as those described above, are shown stored within the non-transitory computer readable memory. In other implementations, program instructions, and/or data may be received, sent, or stored on different types of computer-accessible media, such as non-transitory media, or on similar media separate from the non-transitory computer readable media. Generally, a non-transitory, computer readable memory may include storage media or memory media, such as flash memory (e.g., solid state memory), magnetic or optical media (e.g., a disk) coupled to the architecture  200  via an I/O interface. Program instructions and data stored via a non-transitory computer readable medium may be transmitted by transmission media or signals such as electrical, electromagnetic, or digital signals, which may be conveyed via a communication medium such as a network and/or a wireless link, such as may be implemented via a network interface. 
     In some implementations, the I/O interface may be configured to coordinate I/O traffic between the processor(s), the non-transitory computer readable media, and any peripheral devices, the network interface, or other peripheral interfaces, such as input/output devices. In some implementations, the I/O interface may perform any necessary protocol, timing, or other data transformations to convert data signals from one component (e.g., the non-transitory computer readable media) into a format suitable for use by another component (e.g., processor(s)). In some implementations, the I/O interface may include support for devices attached through various types of peripheral buses, such as a variant of the Peripheral Component Interconnect (PCI) bus standard or the Universal Serial Bus (USB) standard, for example. In some implementations, the function of the I/O interface may be split into two or more separate components, such as a north bridge and a south bridge, for example. Also, in some implementations, some or all of the functionality of the I/O interface, such as an interface to the non-transitory computer readable media, may be incorporated directly into the processor(s). 
     In the example architecture  200  shown in  FIG.  2   , the example vehicle systems  202  include a plurality of sensors  204 , for example, configured to sense movement of the vehicle  102  through the environment  100 , sense environmental data, such as the ambient temperature, pressure, and humidity, and/or sense objects in the environment  100  surrounding the vehicle  102 . In some examples, the sensors  204  may include sensors configured to identify a location on a map (e.g., a geographic location of the vehicle  102 ). The sensors  204  may include, for example, one or more light detection and ranging sensors (LIDAR), one or more cameras, one or more radio detection and ranging sensors (RADAR), one or more sound navigation and ranging sensors (SONAR) (e.g., ultrasonic transducers), one or more microphones for sensing sounds in the environment  100 , such as sirens from law enforcement and emergency vehicles, and other sensors related to the operation of the vehicle  102 . Other sensors may include a speed sensor, sensors related to operation of internal combustion engines and/or electric motors, sensors related to the tires to detect tire temperature, tire pressure, and tread depth, and/or brake-related sensors for detecting brake temperatures and/or wear, and in vehicles having regenerative braking, sensors for detecting parameters related to operation of the regenerative braking system. The sensors  204  may also include, for example, inertial measurement units (IMUs), accelerometers, and gyroscopes. The sensors  204  may be configured to provide sensor data  206  representative of the sensed objects and signals to the vehicle systems  202  via, for example, an input/output (I/O) interface  208 . Other types of sensors and sensor data are contemplated. As noted above, in some examples one or more of the I/O interfaces  208  described herein, and/or the vehicle system  202  generally, may include an antenna, transmitter, transceiver, and/or other components configured to enable dynamic short range communication between the vehicles  102 . In particular, such components may enable the transfer of signals and/or information between the vehicles  102  as the vehicles traverse the road network  104 . 
     The example vehicle systems  202  also include location systems  210  configured to receive location information, including position and orientation data (e.g., a local position or local pose (e.g., a location and orientation)) from the sensors  204  and/or external sources, and provide location data  212  to other portions of the vehicle systems  202  via the I/O interface  208 . The external sources may include global satellites for facilitating operation of a global positioning system (GPS) and/or a wireless network for communicating and receiving information related to the vehicle&#39;s location, such as map data. The location systems  210  may also include sensors configured to assist with navigation of the vehicle  102 , such as wheel encoders for sensing the rotation of the wheels  128 , inertial navigation sensors, such as gyroscopes and/or accelerometers, and/or cameras for obtaining image data for dead-reckoning navigation (e.g., visual odometery), a Bayesian filtering schema (e.g. SLAM), bundle adjustment, or the like. 
     The example vehicle systems  202  also include one or more of a path calculator  214 , an object data calculator  216 , an object classifier  218 , a collision predictor system  220 , a kinematics calculator  222 , and a safety system actuator  224 . The vehicle systems  202  may be configured to access one or more data stores including, but not limited to, an object type data store  226 . The object type data store  226  may include data representing object types associated with object classifications for objects detected in the environment  100 . 
     The example vehicle systems  202  shown in  FIG.  2    also include a vehicle controller  228  configured to receive vehicle control data  230 , and based on the vehicle control data  230 , communicate with a drive system  232  (e.g., a steering system, a propulsion system, suspension system, and/or a braking system) to control operation of the vehicle  102 . For example, the vehicle control data  230  may be derived from data received from one of more of the sensors  204  and one or more of the path calculator  214 , the object data calculator  216 , the object classifier  218 , the collision predictor system  220 , the kinematics calculator  222 , and the safety system actuator  224 , and control operation of the drive system  232 , so that operation and maneuvering of the vehicle  102  is executed. 
     In some examples, the path calculator  214  may comprise a software and/or hardware component of the vehicle controller  228 , and the path calculator  214  may be configured to generate data representative of a trajectory of the vehicle  102 , for example, using data representing a location of the vehicle  102  in the environment  100  and other data, such as local pose data, that may be included in the location data  212 . In some examples, the path calculator  214  may also be configured to determine projected trajectories predicted to be executed by the vehicle  102 . The path calculator  214  may, in some examples, be configured to calculate data associated with a predicted motion of an object in the environment  100 , and may determine a predicted object path associated with the predicted motion of the object. In some examples, the object path may include the predicted object path. In some examples, the object path may include a predicted object trajectory. In some examples, the path calculator  214  may be configured to predict more than a single predicted object trajectory. For example, the path calculator  214  may be configured to predict multiple object trajectories based on, for example, probabilistic determinations or multi-modal distributions of predicted positions, trajectories, and/or velocities associated with an object. In any of the examples described herein, the path calculator  214  may configured to generate and/or otherwise determine a path along or within which the vehicle  102  will travel, and such a path may be determined by the path calculator  214  based at least partly on and/or in accordance with a set of parameters provided by the remote vehicle control system  154 . In particular, in some examples the path calculator  214  may be configured to determine a drive envelope  138  defining and/or including a drive line  146  along or within which the vehicle  102  will travel to the destination  124 . Such a drive line  146  may indicate an ideal line for the vehicle  102  to follow and may further comprise one or more trajectories (e.g., a series of consecutive trajectories), and the drive line  146  and/or such trajectories may define a prioritized path extending from the vehicle  102  to the destination  124 . 
     In some examples, the object data calculator  216  may be configured to provide data representative of, for example, one or more of the location of an object in the environment  100  surrounding the vehicle  102 , an object track associated with the object, and an object classification associated with the object. For example, the object data calculator  216  may be configured to receive data in the form of sensor signals received from one or more of the sensors  204  and determine data representing one or more of the location in the environment  100  of the object, the object track, and the object classification. 
     In some examples, the object classifier  218  may be configured to access data from the object type data store  226 , which may be configured to store data representing object types, such as, for example, a species of an object classification, a subclass of an object classification, and/or a subset of an object classification. The object classifier  218 , in some examples, may be configured to analyze data representing an object track and data representing an object classification with data representing an object type, and determine an object type based at least in part on the object track and classification data. For example, a detected object having an object classification of an “automobile” may have an object type of “sedan,” “coupe,” “hatch-back,” “sports utility vehicle,” “pick-up truck,” or “minivan.” An object type may include additional subclasses or subsets. For example, a “sedan” that is parked may have an additional subclass designation of being “static” or “being dynamic” if moving. 
     In some examples, the collision predictor system  220  may be configured to use the data representing the object type, the data representing the trajectory of the object, and/or the data representing the trajectory of the vehicle  102 , to predict a collision between the vehicle  102  and the object. 
     In some examples, the kinematics calculator  222  may be configured to determine data representing one or more scalar and/or vector quantities associated with motion of objects in the environment  100 , including, but not limited to, velocity, speed, acceleration, deceleration, momentum, local pose, and/or force. Data from the kinematics calculator  222  may be used to compute other data, including, but not limited to, data representing an estimated time to impact between an object and the vehicle  102 , and data representing a distance between the object and the vehicle  102 . In some examples, the kinematics calculator  222  may be configured to predict a likelihood that other objects in the environment  100  (e.g., cars, motorcyclists, pedestrians, cyclists, and animals) are moving in an alert or controlled state, versus an un-alert or uncontrolled state. For example, the kinematics calculator  222  may be configured estimate the probability that other objects are moving as though they are being controlled and/or are behaving in a predictable manner, or whether they are not being controlled and/or behaving in an unpredictable manner, for example, by observing motion of the object over time and relative to other objects in the environment  100 . For example, if the objects are moving erratically or without appearing to adjust to the presence or motion of other objects in the environment  100 , this may be an indication that the objects are either uncontrolled or moving in an unpredictable manner. This may be inferred based on sensor data received over time that may be used to estimate or predict a future location of the object relative to a current or future trajectory of the vehicle  102 . 
     In some examples, the safety system actuator  224  may be configured to activate one or more safety systems of the vehicle  102  when a collision is predicted by the collision predictor  220  and/or the occurrence of other safety related events, such as, for example, an emergency maneuver by the vehicle  102 , such as hard braking or a sharp acceleration. The safety system actuator  224  may be configured to activate an interior safety system (e.g., including seat belt pre-tensioners and/or air bags), an exterior safety system (e.g., including warning sounds and/or warning lights), the drive system  232  configured to execute an emergency maneuver to avoid a collision, and/or any combination thereof. For example, the drive system  232  may receive data for causing a steering system of the vehicle  102  to change the travel direction of the vehicle  102 , and a propulsion system of the vehicle  102  to change the speed of the vehicle  102  to alter the trajectory of vehicle  102  from an initial trajectory to a trajectory for avoiding a collision. 
     The vehicle systems  202  may operate according to the following example. Data representing a trajectory of the vehicle  102  in the environment  100  may be received by the vehicle controller  228 . Object data associated with an object in the environment  100  surrounding the vehicle  102  may be calculated. Sensor data  206  from one or more of the sensors  204  may be used to calculate the object data. The object data may include data representing the location of the object in the environment  100 , an object track associated with the object, such as whether the object is stationary or moving, and an object classification associated with the object, such as whether the object is another vehicle, a pedestrian, a cyclist, an animal, or a stationary object. In some examples, the object data calculator  216 , based on the object data, may be used to determine data representing the object&#39;s location in the environment  100 , data representing whether the object is moving, and data representing a classification associated with the object. 
     In some examples, the path calculator  214  may use the object data to determine a predicted path of the object in the environment, for example, based on data representing the location of the object and may process that data to generate data representing a predicted object path. Data representing the type of object may be determined based on the data representing whether the object is moving, data representing the object&#39;s classification, and/or data representing object&#39;s type. A pedestrian not in motion, a vehicle in motion, and traffic sign, a lane marker, or a fire hydrant, none of which is in motion, are examples of object types with an associated motion data. 
     In some examples, the collision predictor system  220  may be used to predict a collision between the vehicle  102  and an object in the environment  100  based on the object type, whether the object is moving, the trajectory of the vehicle  102 , the predicted path of the object obtained from the path calculator  214 . For example, a collision may be predicted based in part on the object type due to the object moving, the trajectory of the object being in potential conflict with the trajectory of the vehicle  102 , and the object having an object classification that indicates the object is a likely collision threat. 
     In some examples, the safety system actuator  224  may be configured to actuate one or more portions of a safety system of the vehicle  102  when a collision is predicted. For example, the safety system actuator  224  may activate one or more safety systems of the vehicle  102 , such as, for example, one or more of the interior safety systems, one or more of the exterior safety systems, and one or more of the components of the drive system  232  (e.g., the steering system, the propulsion system, and/or the braking system) via the vehicle controller  228 . In some examples, the vehicle controller  228  may determine that the interior safety system will be activated based on some action of an object in the environment  100 , and the vehicle control data  230  may include information configured to cause the vehicle controller  228  to activate one or more functions of the interior safety system, the exterior safety system, and the drive system  232 . 
     As shown in  FIG.  2   , the example vehicle systems  202  also include a network interface  234  configured to provide a communication link between the vehicle  102  and the remote vehicle control system  154 . For example, the network interface  234  may be configured to allow data to be exchanged between the vehicle  102 , other devices coupled to the network  152 , such as other computer systems, other vehicles  102  in the fleet of vehicles, and/or with the remote vehicle control system  154 . For example, the network interface  234  may enable wireless communication between numerous vehicles and/or the remote vehicle control system  154 . In various implementations, the network interface  234  may support communication via a wireless general data networks, such as a Wi-Fi network. For example, the network interface  234  may support communication via telecommunications networks, such as, for example, cellular communication networks, satellite networks, and the like. Further, the vehicle controller  228  may provide, via the network interface  234 , signals corresponding to and/or containing information indicative of inputs received via the preferential travel input device  148 . The vehicle controller  228  may also provide information indicative of one or more travel paths (e.g., the prioritized described herein) and/or one or more additional parameters included in a set of parameters via the preferential travel output device  150 . Such information may be generated by the path calculator  214 . Additionally or alternatively, such information may be received, by the network interface  234 , from the remote vehicle control system  154  and via the network  152 . In some examples, the vehicle controller  228  may additionally, or alternatively, control a suspension system of the vehicle  102 . For example, in modifying operating parameters of the vehicle  102  based on a set of modified parameters received from the remote vehicle control system  154 , the vehicle controller  228  may lower a suspension of the vehicle  102 , increase a vehicle speed, stiffen a shock/strut response, and/or otherwise modify various vehicle component settings. As a result, the ride experience of a passenger may be altered. For example, controlling the vehicle  102  based on the received set of modified parameters may cause a passenger to experience enhanced accelerations in a lateral (e.g., sideways) direction, an axial direction (e.g., a direction substantially along the drive line  146 ), and/or a vertical direction (e.g., a direction substantially perpendicular to the road  106 ). 
     In various implementations, the parameter values and other data illustrated herein may be included in one or more data stores, and may be combined with other information not described or may be partitioned differently into more, fewer, or different data structures. In some implementations, data stores may be physically located in one memory or may be distributed among two or more memories. 
     Those skilled in the art will appreciate that the example architecture  200  is merely illustrative and is not intended to limit the scope of the present disclosure. In particular, the computing system and devices may include any combination of hardware or software that can perform the indicated functions, including computers, network devices, internet appliances, tablet computers, PDAs, wireless phones, pagers, etc. The architecture  200  may also be connected to other devices that are not illustrated, or instead may operate as a stand-alone system. In addition, the functionality provided by the illustrated components may in some implementations be combined in fewer components or distributed in additional components. Similarly, in some implementations, the functionality of some of the illustrated components may not be provided and/or other additional functionality may be available. 
     Those skilled in the art will also appreciate that, while various items are illustrated as being stored in memory or storage while being used, these items or portions of them may be transferred between memory and other storage devices for purposes of memory management and data integrity. Alternatively, in other implementations, some or all of the software components may execute in memory on another device and communicate with the illustrated architecture  200 . Some or all of the system components or data structures may also be stored (e.g., as instructions or structured data) on a non-transitory, computer-accessible medium or a portable article to be read by an appropriate drive, various examples of which are described above. In some implementations, instructions stored on a computer-accessible medium separate from the architecture  200  may be transmitted to the architecture  200  via transmission media or signals such as electrical, electromagnetic, or digital signals, conveyed via a communication medium such as a wireless link. Various implementations may further include receiving, sending, or storing instructions and/or data implemented in accordance with the foregoing description on a computer-accessible medium. Accordingly, the techniques described herein may be practiced with other control system configurations. 
       FIG.  3    shows an example architecture  300  including a vehicle fleet  302  and an example remote vehicle control system  154 . The example vehicle fleet  302  includes a plurality of vehicles  102 , at least some which are communicatively coupled to the remote vehicle control system  154 , for example, via the respective network interfaces  234  of the vehicles  102 , and a receiver  304  and a transmitter  306  associated with the remote vehicle control system  154 . For example, a vehicle  102  may send communication signals via the network interface  234 , which are received by the receiver  304 . In some examples, the communication signals may include, for example, sensor data from sensor signals generated by one or more sensors associated with the vehicle  102 , and/or road network data from a road network data store. In some examples, the sensor data may include raw sensor data or processed sensor data, and the road network data may include data related to a global or local map of an area associated with operation of the vehicle  102 . In any of the examples described herein, such road network data may also include one or more of lane widths, speed limits, or a road map. Such lane widths, speed limits, and road maps may correspond to the one or more roads  106  of the road network  104  described herein. In some examples, the communication signals may include data associated with the current status of the vehicle  102  and its systems, such as, for example, its current position, current speed, current path, current occupancy, the level of charge of one or more of its batteries, and/or the operational status of its sensors and drive systems. In some examples, the communication signals from the vehicle  102  may include a request for information from the remote vehicle control system  154 . Such information, may include, for example, assistance with operation of the vehicle  102  in the form of, for example, information about objects, the road network  104 , the road  106 , the global map, the local map, collaboration with respect to vehicle operations and maneuvers, and/or confirmation of information and/or actions proposed by the vehicle  102 . In some examples, the communication signals from the vehicle  102  may include a request for preferential travel associated with the vehicle  102  and a particular destination  124  accessible via the road network  104 . A passenger of the vehicle  102  may enter such a request via the preferential travel input device  148 , and such a request may include at least an address, coordinates, and/or other information indicating the location of the destination  124 . 
     As shown in  FIG.  3   , the receiver  304  may be communicatively coupled to the computing device  160 , and in some examples, the operator  158  may be able access the sensor data, the road network data, and/or any other data in the communication signals received from a vehicle  102  using the computing device  160 . In some examples, the operator  158  may be able to selectively access the sensor data, road network data, and/or other data via the input device  164  and view the selected data via one or more of the displays  162  (see  FIG.  1   ). In some examples, such road network data may be stored in the object type data store  226  and/or in a road network data store operably connected to the vehicle controller  228 . Such a road network data store may comprise a component of the vehicle system  202 . In other examples, the road network data store may comprise a component of the remote vehicle control system  154  and may be operably connected to the computing device  160 . In still further examples, a first portion of the road network data store may comprise a component of the remote vehicle control system  154 , and a second portion of the road network data store may comprise a component of the vehicle system  202 . 
     In the example shown, the remote vehicle control system  154  also includes a network module  308  configured to provide communication between two or more of the computing device  160  and the respective operators  158 , and/or communication with vehicle control data  310 . For example, the remote vehicle control system  154  may include a plurality of computing devices  160  and respective operators  158 , and the operators  158  may communicate with one another via the network module  308  to facilitate and/or coordinate the various sets of parameters, path information, and/or other guidance provided to the vehicles  102  of the vehicle fleet  302 . In some examples, there may be an operator  158  assigned to each of the vehicles  102 , and in some examples, an operator  158  may be assigned to more than a single vehicle  102  of the vehicle fleet  302 . In some examples, operators  158  may not be assigned to specific vehicles  102  of the vehicle fleet  302 , but may instead provide sets of parameters, drive lines, trajectories, path information, and/or other guidance to vehicles  102  based on, for example, a level of urgency and/or a level of priority associated with the respective vehicles  102 . In some examples, the various sets of parameters, path information, and/or other guidance provided to the vehicles  102  of the vehicle fleet  302  by an operator  158  may be stored by the remote vehicle control system  154 , for example, in storage for the vehicle control data  310 , and/or accessed by other operators  158 . Further, it is understood that in some examples, the remote vehicle control system  154  may be fully automated. In such examples, the operators  158  described herein may be omitted. Additionally, in other examples, any of the methods and/or functions described herein may be performed by one or more of the local vehicle controllers  228 . In such examples, the remote vehicle control system  154  may be omitted. 
     In some examples, the vehicle control data  310  may be accessible by the operators  158 , for example, via the computing device  160 , for use in generating one or more sets of modified parameters, drive lines, trajectories, drive envelopes, path information, and/or other guidance to the vehicles  102 . For example, the vehicle control data  310  may include global and/or local map data related to the road network  104 , events associated with the road network  104 , and/or travel conditions associated with the road network  104  due to, for example, traffic volume, weather conditions, construction zones, and/or special events. In some examples, the vehicle control data  310  may include data associated with one more of the vehicles  102  of the vehicle fleet  302 , such as, for example, maintenance and service information, and/or operational history including, for example, event history associated with the vehicle  102 , path histories, one or more sets of parameters governing operation of the vehicle  102 , previously visited destinations  124 , occupancy histories, and other types of data associated with the vehicle  102 . In any of the examples described herein, and as noted above, one or more of the vehicles  102  may travel within a respective drive envelope  138  in accordance with a set of nominal operating parameters during normal operation. The one or more sets of modified operating parameters described herein may include, for example, an alteration (e.g., a relaxation or reduction) of at least one of the nominal operating parameters governing the current/normal operation of the vehicle  102 . In another example, such a set of modified parameters may include at least one additional operating parameter not included in the nominal operating parameters. In a further example, such a set of modified parameters may omit one or more of the nominal operating parameters. In any such examples, upon receiving the set of modified parameters from the remote vehicle control system  154 , the vehicle controller  228  may control operation of the vehicle  102  based at least in part on the set of modified operating parameters. 
       FIGS.  4   a - 7   b    illustrate example schematic overhead views of an example road network  104  including example vehicles  102   a - 102   c  (vehicles  102   a - 102   f  are shown in 
       FIGS.  6   a  and  6   b   , and collectively, the vehicles shown in  FIGS.  4   a - 7   b    may be referred to herein as “vehicles  102 ”). In  FIGS.  4   a - 7   b   , the vehicles  102  are shown en route between respective first geographic locations and respective destinations at second geographic areas. For example,  FIG.  4   a    illustrates a first vehicle  102   a  traveling, in the first direction  132 , in the first lane  110   a  of the road  106  toward a particular destination  124 . One or more of the additional vehicles  102   b ,  102   c  may also be traveling en route to the destination  124 , or alternatively, one or more of the vehicles  102   b ,  102   c  may be traveling to a different respective destination (not shown). In such examples, one or more of the vehicles  102  may travel within respective drive envelopes between respective first geographic locations  120  and respective destinations  124 . It is understood that such drive envelopes may each present unique driving circumstances for the respective vehicles  102 . For example, such drive envelopes may cause the respective vehicles to pass through or proximate an accident zone, a lane closure, merging traffic, a school zone, a crosswalk, a police officer directing traffic, a construction zone, or other areas requiring modifications to the speed, and/or other operations of the vehicles  102 . Additionally, in some situations, one or more of the vehicles  102  may receive an input from one or more passengers of the vehicle  102  indicative of a request for preferential travel. In any of the above situations, the methods, systems, and/or other aspects of the present disclosure may be used to determine one or more sets of modified parameters governing operation of the respective vehicles  102  once preferential travel has been requested. An example set of modified parameters may be different from the set of nominal operating parameters currently governing operation of the vehicle  102 , and may cause and/or require a requesting vehicle  102  to travel along a prioritized path to the destination  124  without being slowed or otherwise hindered by the remaining vehicles  102  in the road network  104 . In particular, example command signals including respective sets of modified parameters may be provided to the vehicles  102 . Upon receiving such sets of modified parameters, the vehicle controllers  228  of the respective vehicles  102  may cause and/or require the vehicles  102  to travel within respective drive envelopes such that the requesting vehicle  102  is provided with a free lane (e.g., the first lane  110   a ) or other portion of the road network  104  in order to reach the destination  124  expeditiously. In such examples, the vehicle controller  228  of each of the respective vehicles  102  may consume respective sets of modified parameters and/or other information included in such command signals, and the path calculator  214  of each of the respective vehicles may determine one or more trajectories, a drive line including each of the one or more trajectories, drive envelope including the drive line, and/or other items based at least partly on such command signals and/or sets of parameters. In some examples, such commands to the vehicle controller  228  may additionally, or alternatively, comprise an increase in speed with an accompanying change in vehicle suspension to provide passengers with a racecar-like experience. In some examples, such a request may be made by a first responder (e.g. ambulance, fire truck, police, etc.) to create a free lane for optimizing travel time of the first responders. 
       FIG.  4   a    illustrates an example embodiment in which the vehicle  102   a  is traveling along the road  106 , in the first direction  132 , toward a particular destination  124 . In such examples, a passenger of the vehicle  102   a  may provide an input via the preferential travel input device  148  of the vehicle  102   a . For example, the passenger may provide such an input by actuating, pressing, moving, touching, and/or otherwise contacting the preferential travel input device  148 . Additionally or alternatively, the passenger may provide an input by speaking, waiving, making one or more hand gestures, and/or through other non-contact methods. Any such inputs may be indicative of a request for preferential travel between a current location of the vehicle  102   a  and the destination  124 . As noted above, such a request may comprise a request for a prioritized path in which none of the additional vehicles in the road network are disposed within or along a drive envelop and/or trajectory of the requesting vehicle  102  as the requesting vehicle  102  travels to the particular destination  124 . In such examples, the vehicle  102   a  may be controlled to travel along a trajectory for a finite period of time or for a finite distance. For example, such a drive envelope and/or trajectory may comprise a drive segment, line, and/or route along which the requesting vehicle  102   a  may be controlled to travel for approximately 10 seconds. Alternatively, such a drive envelope and/or trajectory may comprise a drive segment, line, and/or route along which the requesting vehicle  102   a  may be controlled to travel for the next 500 feet. It is understood that the finite period of time and finite distance noted above are merely examples and, in further embodiments, such finite periods of time and finite distances may be greater than or less than those noted above. For instance, in examples in which the requesting vehicle  102   a  is traveling at a relatively high rate of speed, the finite period of time may be decreased and/or the finite distance may be commensurately increased to account for such speeds. Likewise, in examples in which the requesting vehicle  102   a  is traveling at a relatively low rate of speed, the finite period of time may be increased and/or the finite distance may be commensurately decreased. In such examples, it may be permissible for such additional vehicles  102   b ,  102   c  to be traveling in one or more lanes  110  (e.g., the first lane  110   a ) adjacent to the second lane  110   b  in which the requesting vehicle  102   a  is traveling, as such locations would be outside of the trajectory of the requesting vehicle  102   a.    
     The vehicle controller  228  in communication with the preferential travel input device  148  may generate a signal indicative of the request for preferential travel, and the vehicle controller  228  may provide the signal to the remote vehicle control system  154 , via the network  152 . The remote vehicle control system  154  may determine respective sets of modified parameters for the one or more vehicles  102  in the road network  104  based at least partly on the request. In some examples, the sets of modified parameters may include respective drive envelopes, trajectories, drive lines, drive envelopes and/or parameters governing travel of the respective vehicles  102  in the road network  104 . Alternatively, the sets of parameters may provide information and or instructions which, when consumed by a vehicle controller  228  may cause the path calculator  214  to generate and/or otherwise determine one or more trajectories, a drive line, a drive envelope, and/or other parameters governing travel of the corresponding vehicle. The remote vehicle control system  154  may also provide corresponding command signals to the respective vehicles  102 , and the command signals may each include one or more of the respective sets of parameters described herein. In some examples, a set of parameters included in a command signal received by the requesting vehicle  102   a  may cause the vehicle  102   a  to move from the first lane  110   a  to the second lane  110   b  in the direction of arrow  400 . In such examples, as will be described below, one or more drive envelopes defining a prioritized path to the destination  124  may be at least partly defined by and/or may pass substantially along the second lane  110   b . Additionally, the set of parameters included in the command signal received by the requesting vehicle  102   a  may cause the vehicle  102   a  to accelerate and/or decelerate in order to move in the direction of arrow  400  and/or to travel along such drive line. Such sets of parameters may also cause modification of a suspension setting, speed threshold, engine setting, turbo setting, brake setting, and/or other operating parameter of a respective vehicle  102 . As a non-limiting example, the suspension may be lowered during the initial acceleration into the prioritized trajectory and/or along the drive line defined by arrow  400  such that the passenger requesting the prioritization experiences modified vehicle settings that correspond to the prioritization request and/or to preference of the passenger. 
       FIG.  4   b    illustrates the example of  FIG.  4   a    after the vehicles  102   a ,  102   b ,  102   c  have been caused to operate in accordance with the command signals described above. For example, upon receiving a first command signal from the remote vehicle control system  154  including a first set of parameters, the first vehicle  102   a  may be caused to travel along a prioritized path  402  (e.g., a first path  402  extending from the vehicle  102   a  to the destination  124 ). The first path  402  may comprise the drive line  146  and/or a first drive envelope  138  that includes the drive line  146 , i.e. an ideal line for the vehicle  102  to follow. For example, the first path  402  may comprise a series of consecutive prioritized trajectories, and together, such trajectories may define the drive line  146  within the drive envelope  138 . In such examples, the vehicle  102   a  may travel along the drive line  146 , and the drive line  146  may extend approximately centrally through the drive envelope  138  and/or the first path  402 . Additionally, upon receiving respective second and third command signals from the remote vehicle control system  154  including respective second and third sets of parameters, the second vehicle  102   b  and the third vehicle  102   b  may be caused to travel along respective drive lines maintaining the vehicles  102   b ,  102   c  outside of the drive envelopes and/or one or more trajectories defining the drive line  146  of the requesting vehicle  102   a  as the requesting vehicle  102   a  travels to the particular destination  124  along the prioritized path  402 . In particular, upon receiving a second command signal from the remote vehicle control system  154 , the second vehicle  102   b  may be caused to travel within a second drive envelope  406  defined by and/or including a corresponding third drive line (not shown), and upon receiving a third command signal from the remote vehicle control system  154 , the third vehicle  102   c  may be caused to travel within a third drive envelope  408  defined by and/or including a corresponding third drive line (not shown). Based on the sets of modified parameters included in such second and third control signals, the respective vehicle controllers  228  of the second and third vehicles  102   b ,  102   c  may maintain the second and third vehicles  102   b ,  102   c  outside of the drive envelope(s) and/or one or more trajectories defining the drive line  146  of the requesting vehicle  102   a  as the requesting vehicle  102   a  travels to the particular destination  124  along the prioritized path  402 . The sets of parameters included in the command signals received by the second and third vehicles  102   b ,  102   c  may also cause at least one of the second and third vehicles  102   b ,  102   c  to accelerate and/or decelerate in order to travel within the second and third drive envelopes  406 ,  408 , respectively. 
     Additionally, in such examples the first set of parameters may be at least partly less restrictive than the second and third sets of parameters, thereby providing the first vehicle  102   a  with expanded road network usage privileges relative to the remaining vehicles  102  in the road network  104 . For instance, in any of the examples described herein, the sets of parameters may include a speed threshold below which a respective one of the vehicles  102  may be permitted and, in some situations, required to operate, a drive line  146  along which the one of the vehicles  102  may be permitted and, in some situations, required to travel, a drive envelope  138  and/or path along which or within which the one of the vehicles  102  may be permitted and, in some situations, required to travel, traffic rules (e.g., rules governing vehicle operation with regard to stop signs, traffic lights, no passing zones, school zones, or other areas) with which the one of the vehicles  102  must abide, engine, turbo, brake, suspension, and/or other vehicle component settings, and/or other rules or limitations for operating the one of the vehicles  102 . In such examples, the thresholds, drive envelopes, traffic rules, vehicle component settings, and/or other rules or limitations included in the first set of parameters may be at least partly less restrictive than the corresponding rules or limitations included in the additional sets of parameters determined by the remote vehicle control system  154 . 
     Although  FIGS.  4   a  and  4   b    illustrate an example embodiment in which the requesting vehicle  102   a  may be caused to move from a first lane  110   a  to a second lane  110   b , in other examples various command signals provided by the remote vehicle control system  154  may include respective sets of modified parameters that cause vehicles  102  other than the requesting vehicle  102   a  to change lanes. For example,  FIGS.  5   a  and  5   b    illustrate an example embodiment in which the requesting vehicle  102   a  may be controlled to remain in the first lane  110   a  (e.g., the lane in which the requesting vehicle  102   a  is currently traveling) and in which one or more of the additional vehicles  102  traveling along the road  106  may be caused to move from the lane in which the requesting vehicle  102   a  is currently traveling (e.g., the first lane  110   a ) to the second lane  110   b  and/or any other lane different from the lane in which the requesting vehicle  102   a  is currently traveling. In such examples, and as illustrated in  FIG.  5   a   , the vehicle  102   a  may be traveling in the first direction  132  toward a particular destination  124 . During such travel, a passenger of the vehicle  102   a  may provide an input via the preferential travel input device  148  of the vehicle  102   a , and the input may be indicative of a request for prioritized travel between a current location of the vehicle  102   a  and the destination  124 . 
     The vehicle controller  228  in communication with the preferential travel input device  148  of the requesting vehicle  102   a  may generate a signal indicative of the request for preferential travel, and the vehicle controller  228  may provide the signal to the remote vehicle control system  154 , via the network  152 . The remote vehicle control system  154  may determine respective sets of modified parameters for the one or more vehicles  102  in the road network  104  based at least partly on the request. In some examples, the sets of modified parameters may include respective trajectories, drive lines, drive envelopes, and/or other parameters governing travel of the respective vehicles  102  in the road network  104 . Alternatively, the sets of parameters may provide information and/or instructions which, when consumed by a vehicle controller  228  may cause the path calculator  214  to generate and/or otherwise determine one or more trajectories, a drive line, a drive envelope, and/or other parameters governing travel of the corresponding vehicle. Such respective sets of parameters may also include any of the additional settings, thresholds, rules, limitations, or other parameters described herein. The remote vehicle control system  154  may also provide corresponding command signals to the respective vehicles  102 , and the command signals may each include one or more of the respective sets of parameters described herein. 
     In the embodiment illustrated by  FIG.  5   a   , a command signal received by the requesting vehicle  102   a  and including a first set of parameters may cause the vehicle  102   a  to remain in its current lane (i.e., first lane  110   a ). In such examples, a prioritized path extending from the requesting vehicle  102   a  to the destination  124  may be at least partly defined by and/or may pass substantially along the first lane  110   a . Additionally, the command signals received by the remaining vehicles  102   b ,  102   c  in the road network  104  and including respective second and third sets of parameters, may cause one or more of the vehicles  102   b ,  102   c  to move in the direction of arrow  500  from the first lane  110   a  to the second lane  110   b  and/or any other lane different from the first lane  110   a . In any such examples, one or more sets of parameters included in the command signals may cause a respective vehicle  102  to accelerate and/or decelerate in order to change from the first lane  110   a  to the second lane  110   b , and/or to travel along a respective trajectory. Such sets of parameters may also cause modification of a suspension setting, speed threshold, engine setting, turbo setting, brake setting, and/or other operating parameter of a respective vehicle  102 , as described herein. 
       FIG.  5   b    illustrates the embodiment of  FIG.  5   a    after the vehicles  102   a ,  102   b ,  102   c  have been caused to operate in accordance with the command signals described above. For example, upon receiving a first command signal from the remote vehicle control system  154  including a first set of parameters, the first vehicle  102   a  may be caused to travel along a prioritized path  502  (e.g., a first path  502  extending from the vehicle  102   a  to the destination  124 ). The first path  502  may comprise the drive line  146  and/or a first drive envelope  138  that includes and/or is defined by the drive line  146 . In such examples, the vehicle  102   a  may travel along the drive line  146 , and the drive line  146  may extend approximately centrally through the drive envelope  138  and/or the first path  502 . As illustrated in  FIG.  5   b   , the first drive envelope  138  and the respective drive line  146  may be substantially longer than those of vehicles  102   b ,  102   c  (i.e.  506  and  508 ) despite corresponding to a substantially similar receding horizon (e.g. 10 seconds). In such an example, the longer drive envelope  138 /drive line  146  of vehicle  102   a  may be indicative of a greater rate of travel (i.e. speed) than either vehicle  102   b ,  102   c . In the example shown in  FIG.  5   b   , the command signal received from the remote vehicle control system  154  may cause the vehicle  102   a  to remain in the first lane  110   a  as the vehicle  102   a  travels along at least part of the first path  502 . 
     Additionally, upon receiving respective second and third command signals from the remote vehicle control system  154  including respective second and third sets of parameters, the second vehicle  102   b  and the third vehicle  102   b  may be caused to travel along respective drive lines maintaining the vehicles  102   b ,  102   c  outside of the one or more drive envelopes and/or trajectories defining the drive line  146  of the requesting vehicle  102   a  as the requesting vehicle  102   a  travels to the destination  124  along the prioritized path  502 . In particular, upon receiving a second command signal from the remote vehicle control system  154 , the second vehicle  102   b  may be caused to travel within a second drive envelope  506  defined by and/or including a corresponding second drive line (not show), and upon receiving a third command signal from the remote vehicle control system  154 , the third vehicle  102   c  may be caused to travel within a third drive envelope  508  defined by and/or including a corresponding third drive line (not show). Based on the sets of modified parameters included in such second and third control signals, the respective vehicle controllers  228  of the second and third vehicles  102   b ,  102   c  may maintain the second and third vehicles  102   b ,  102   c  outside of the one or more drive envelopes and/or trajectories defining the drive line  146  of the requesting vehicle  102   a  as the requesting vehicle  102   a  travels to the destination  124  along the prioritized path  502 . The sets of parameters included in the respective command signals received by the second and third vehicles  102   b ,  102   c  may cause at least one of the second and third vehicles  102   b ,  102   c  to accelerate and/or decelerate in order to travel within the second and third drive envelopes  506 ,  508 , respectively. For example, the set of parameters included in the command signal received by the second vehicle  102   b  may cause the vehicle  102   b  to accelerate in order to move in the direction of arrow  500  and/or to change from the first lane  110   a  to the second lane  110   b . Additionally or alternatively, the set of parameters included in the command signal received by the third vehicle  102   c  may cause the third vehicle  102   c  to decelerate in order to permit the second vehicle  102   b  to pass in front of the third vehicle  102   c . Additionally, in such examples the first set of parameters may be at least partly less restrictive than the second and third sets of parameters, thereby providing the first vehicle  102   a  with expanded road network usage privileges relative to the remaining vehicles  102  in the road network  104 . 
     In any of the examples described herein, the sets of parameters determined and/or provided by the remote vehicle control system  154  at least partly in response to a request for preferential travel may be determined such that a minimum number of vehicles  102  are caused to change lanes  110  when preferential travel is provided to the requesting vehicle  102   a . Such determinations may be made based on the relative speeds, destinations, applicable traffic rules, and/or locations of the plurality of vehicles  102  in the road network  104  when the request for preferential travel is received by the remote vehicle control system  154 . For example, relatively congested traffic patterns proximate the requesting vehicle  102   a  may cause the remote vehicle control system  154  to determine one or more sets of modified parameters that result in the requesting vehicle  102   a  and at least one of the remaining vehicles  102  in the road network  104  to change lanes.  FIGS.  6   a  and  6   b    illustrate such an example in the context of a road  106  having three lanes  110  (e.g., a first lane  110   a , a second lane  110   b , and a third lanel  10   c ) separated by respective dividing lines  114   a ,  114   b.    
     As shown in  FIG.  6   a   , a first vehicle  102   a  may be traveling in the first direction  132  toward a particular destination  124 . During such travel, a passenger of the vehicle  102   a  may provide an input via the preferential travel input device  148  of the vehicle  102   a , and the input may be indicative of a request for preferential travel from a current location of the vehicle  102   a  to the destination  124 . The vehicle controller  228  in communication with the preferential travel input device  148  of the requesting vehicle  102   a  may generate a signal indicative of the request for preferential travel, and the vehicle controller  228  may provide the signal to the remote vehicle control system  154 , via the network  152 . The remote vehicle control system  154  may determine respective sets of modified parameters for the one or more vehicles  102  in the road network  104  based at least partly on the request. The remote vehicle control system  154  may also provide corresponding command signals to the respective vehicles  102 , and the command signals may each include respective sets of modified parameters as described herein. 
     In the embodiment illustrated by  FIG.  6   a   , a first set of modified parameters included in a command signal received by the requesting vehicle  102   a  may cause the vehicle  102   a  to move, in the direction of arrow  600 , from its current lane (e.g., the third lane  110   c ) to an adjacent lane (e.g., the second lane  110   b ). Such movement may be the result of relatively congested traffic ahead of the vehicle  102   a  in the third lane  110   c  and/or by relatively less congested traffic ahead of the vehicle  102   a  in the second lane  110   b  and/or any other adjacent lane. For example, the presence of vehicles  102   f ,  102   e  ahead of the vehicle  102   a  in the third lane  110   c , as well as the positions of the vehicles  102   f ,  102   e  relative to the vehicle  102   b , and the position of vehicle  102   b  relative to vehicles  102   c ,  102   d , may cause the remote vehicle control system  154  to generate a first set of modified parameters. When such a first set of parameters is consumed by the vehicle controller  228  of the requesting vehicle  102   a , the first set of parameters may cause the path calculator  214  to generate a prioritized path, extending from the requesting vehicle  102   a  to the destination  124 , and resulting in the requesting vehicle  102   a  moving from the third lane  110   c  to the second lane  110   b . The remote vehicle control system  154  may also determine additional sets of parameters for one or more of the vehicles  102  based at least in in part on the travel speeds of the vehicles  102  when the request from the vehicle  102   a  is received. For example, since the requesting vehicle  102   a  is positioned behind vehicles  102   f ,  102   e , movement of the vehicle  102   a  in the direction of arrow  600 , combined with movement of the vehicle  102   b  in the direction or arrow  602 , may result in the most expedient development of a lane (e.g., the second lane  110   b ) in which the requesting vehicle  102   a  may have a relatively clear path to the destination  124 , particularly in situations in which for example, the nominal operating parameters of at least one of the vehicles  102   e ,  102   f  cannot be modified. For example, since the vehicle  102   b  is currently the only vehicle in the second lane  110   b , and the vehicle  102   b  is relatively behind vehicle  102   e  but relatively ahead of vehicle  102   c  in the direction  132 , the remote vehicle control system  154  and/or the path calculator  214  of at least the requesting vehicle  102   a  may determine that movement of the vehicle  102   a  in the direction of arrow  600 , combined with movement of the vehicle  102   b  in the direction or arrow  602 , may be the most efficient manner in which to provide a prioritized path for the vehicle  102   a  to the destination  124 . In such examples, maximizing efficiency may result in the fewest number of vehicles  102  changing lanes  110 , and may depend on, for example, the nominal operating parameters of the various vehicles  102  and whether such parameters may be modified. Additionally or alternatively, maximizing efficiency may result in the fastest travel path for the requesting vehicle  102   a  to the destination  124  (e.g., a prioritized path in which the fewest number of vehicles  102  are required to decelerate, the path in which the speed of the requesting vehicle  102   a  may be maximized, and/or the path in which the travel time for the requesting vehicle  102   a  from its current location to the destination  124  may be minimized). In any such examples, a set of parameters included in one or more of the command signals may cause a respective one of the vehicles  102  to accelerate and/or decelerate in order to move between lanes  110  and/or to travel along respective drive lines. 
       FIG.  6   b    illustrates the embodiment of  FIG.  6   a    after the vehicles  102   a - 102   f  have been caused to operate in accordance with the command signals described above. For example, upon receiving a first command signal from the remote vehicle control system  154  including a first set of parameters, the first vehicle  102   a  may be caused to travel along a prioritized path  604  (e.g., a first path  604  extending from the vehicle  102   a  to the destination  124 ). The first path  604  may comprise the drive line  146  and/or a first drive envelope  138  that includes the drive line  146 . For example, the first path  604  may comprise a series of consecutive prioritized trajectories, and together, such trajectories may define the drive line  146  within the drive envelope  138 . In such examples, the requesting vehicle  102   a  may travel along the drive line  146 , and the drive line  146  may extend approximately centrally through the drive envelope  138  and/or the first path  604 . In the example shown in  FIG.  6   b   , the set of parameters included in the command signal received from the remote vehicle control system  154  may cause the vehicle  102   a  to move from the third lane  110   c  to the second lane  110   b . In such examples, additional sets of parameters included in respective command signals received by the remaining vehicles  102  in the road network  104  may cause the remaining vehicles  102  to travel along respective drive lines maintaining the remaining vehicles  102  outside of the one or more drive envelopes and/or trajectories defining the drive line  146  as the requesting vehicle  102   a  travels to the particular destination  124  along the prioritized path  604 . 
     For example, upon receiving a command signal from the remote vehicle control system  154  including a second set of parameters, the second vehicle  102   b  may be caused to travel within a second drive envelope  608  defined by and/or including a corresponding second drive line (not shown). In the example shown in  FIG.  6   b   , the second set of parameters included in the command signal received from the remote vehicle control system  154  may cause the vehicle  102   b  to move from the second lane  110   b  to the first lane  110   a . Further, additional sets of parameters included in respective command signals from the remote vehicle control system  154  may cause the remaining vehicles  102  to travel within respective drive envelopes maintaining the remaining vehicles  102  outside of the one or more drive envelopes and/or trajectories defining the drive line  146  as the requesting vehicle  102   a  travels to the particular destination  124  along the prioritized path  604 . In particular, upon receiving a third command signal from the remote vehicle control system  154  including a third set of parameters, the third vehicle  102   c  may be caused to travel within a third drive envelope  610  defined by and/or including a corresponding third drive line (not shown). The sets of parameters included in respective command signals received by the additional vehicles  102  in the road network  104  may also be consumed by the vehicle controllers  228  of such vehicles  102 , and may maintain such remaining vehicles  102  outside of the one or more trajectories defining the drive line  146  as the requesting vehicle  102   a  travels to the particular destination  124  along the prioritized path  604 . The sets of parameters included in the respective command signals received by the remaining vehicles  102  may also cause at least one of the remaining vehicles  102  to accelerate and/or decelerate in order to travel within the respective drive envelopes described herein. For example, the set of parameters included in the command signal received by the second vehicle  102   b  may cause the second vehicle  102   b  to accelerate in order to move in the direction of arrow  602  and/or to change from the second lane  110   b  to the first lane  110   a . Additionally or alternatively, the set of parameters included in the command signal received by the third vehicle  102   c  may cause the third vehicle  102   c  to decelerate in order to permit the second vehicle  102   b  to pass in front of the third vehicle  102   c . In such examples, the first set of parameters may be at least partially less restrictive than the second and third sets of parameters, thereby providing expanded road network usage privileges to the requesting vehicle  102   a.    
     Although  FIGS.  4   a - 6   b    illustrate example embodiments in which typical traffic rules (e.g., rules governing vehicle operation with regard to stop signs, traffic lights, no passing zones, school zones, construction zones, lane designations, speed limits, etc.) are substantially obeyed by the vehicles  102  in the road network  104  once a request for preferential travel is received. In additional embodiments, on the other hand, providing a requesting vehicle  102   a  with preferential travel may include permitting the requesting vehicle  102   a  to at least temporarily break one or more traffic rules in order to travel along a prioritized path to the particular destination  124 . For example,  FIGS.  7   a  and  7   b    illustrate an embodiment in which the requesting vehicle  102   a  may be controlled to travel along a prioritized path that is at least partly defined by a drive envelope having an enlarged drive envelope width relative to drive envelope widths corresponding to the remaining vehicles  102  in the road network. In such examples, the drive envelope of the requesting vehicle  102   a  may also straddle at least two lanes  110   a ,  110   b  of the road  106 . Further, in traveling to the destination  124 , the requesting vehicle  102   a  may be permitted to exceed an applicable speed limit associated with the road  106 , may be permitted to ignore double yellow lines, may be permitted to travel abnormally close to an adjacent vehicle (e.g., travel at a distance of one foot or less from an adjacent vehicle), and/or may be configured to modify (e.g., enhance) vision, perception, or other systems of the vehicle  102 . 
     As illustrated in  FIG.  7   a   , the first vehicle  102   a  may be traveling in the first direction  132  toward a particular destination  124 . The first vehicle  102   a  may be traveling, for example, along a first path  702  extending from the first vehicle  102   a  to the destination. In such examples, the first path  702  may be at least partly defined by a first drive envelope  138   a  having a first drive envelope width  142   a . Additionally, the road network  104  may include a second vehicle  102   b  traveling along a second path  704  that is at least partly defined by a second drive envelope  138   b  having a second drive envelope width  142   b . The road network  104  may further include a third vehicle  102   c  traveling along a third path  706  that is at least partly defined by a third drive envelope  138   c  having a third drive envelope width  142   c . In the example embodiment of  FIG.  7   a   , the first, second, and third drive envelope widths  142   a ,  142   b ,  142   c  may be substantially equal. Additionally, at least one of the first, second, and third drive envelope widths  142   a ,  142   b ,  142   c  may be less than or equal to a width of a corresponding lane  110   a ,  110   b  within which the respective drive envelope  138   a ,  138   b ,  138   c  is disposed. In such examples, the first drive envelope  138   a , the second drive envelope  138   b , and the third drive envelope  138   c  may each be disposed within either the first lane  110   a  or the second lane  110   b.    
     In such examples, a passenger of the first vehicle  102   a  may provide an input via the preferential travel input device  148  of the first vehicle  102   a , and the input may be indicative of a request for preferential travel between a current location of the first vehicle  102   a  and the destination  124 . The vehicle controller  228  in communication with the preferential travel input device  148  of the first vehicle  102   a  may generate a signal indicative of the request for preferential travel, and the vehicle controller  228  may provide the signal to the remote vehicle control system  154  via the network  152 . The remote vehicle control system  154  may determine respective sets of modified parameters for the one or more vehicles  102  in the road network  104  based at least partly on the request. The remote vehicle control system  154  may also provide corresponding command signals to the respective vehicles  102 , and the command signals may each include one or more of the respective sets of modified parameters described herein. 
     In the embodiment illustrated by  FIG.  7   b   , a command signal received by the requesting vehicle  102   a  and including a first set of modified parameters may cause the requesting vehicle  102   a  to travel along a prioritized path  708  extending from the vehicle  102   a  to the destination  124 . In such examples, the prioritized path  708  may include a respective drive line comprising one or more consecutive prioritized trajectories (not shown), and may be defined, at least in part, by a fourth drive envelope  138   d  having a fourth drive envelope width  142   d  greater than the first drive envelope width  142   a . As shown in  FIG.  7   b   , the fourth drive envelope  138   d  and/or the prioritized path  708  may span at least part of both the first lane  110   a  and the second lane  110   b . The requesting vehicle  102   a  may be permitted to travel within such a widened prioritized path  708  and/or fourth drive envelope  138   d  despite applicable traffic rules requiring vehicles  102  to travel in a single lane  110   a ,  110   b  unless passing another vehicle  102 . 
     In such examples, the command signal received by the requesting vehicle  102   a  and including such a first set of parameters may also cause the requesting vehicle  102   a  to travel at a speed less than or equal to an increased speed threshold. In such examples, the increased speed threshold may be included in the command signal and may, in some instances, be greater than the speed limit associated with the road  106 . In such examples, the command signal received by the requesting vehicle  102   a  and including such a first set of parameters may further include a modified suspension setting, engine setting, brake pressure setting, turbo setting, and/or other operational parameter. Such modified settings may cause the requesting vehicle  102   a  to operate based at least in part on settings and/or operating preferences corresponding to the request and/or corresponding to the personal preferences of one or more passengers of the requesting vehicle  102   a.    
     Additionally, the command signals received by the remaining vehicles  102   b ,  102   c  in the road network  104  and including respective second and third sets of parameters, may cause one or more of the vehicles  102   b ,  102   c  to move closer to the lane boundary lines  116   a ,  116   b  and/or shoulders corresponding to the lanes  110   a ,  110   b  within which the vehicles  102   b ,  102   c  are traveling. The command signals received by the remaining vehicles  102   b ,  102   c  in the road network  104  and including respective second and third sets of parameters, may also cause one or more of the vehicles  102   b ,  102   c  to travel within respective drive envelopes having reduced width. For example, a second set of parameters included in the command signal received by the second vehicle  102   b  may cause the second vehicle  102   b  to travel in a fifth path  710  that is defined, at least in part, by a fifth drive envelope  138   e  having a fifth drive envelope width  142   e  less than the second drive envelope width  142   b . Additionally, a third set of parameters included in the command signal received by the third vehicle  102   c  may cause the third vehicle  102   c  to travel in a sixth path  712  that is defined, at least in part, by a sixth drive envelope  138   f  having a sixth drive envelope width  142   f  less than the third drive envelope width  142   c . As shown in  FIG.  7   b   , the fifth and sixth drive envelopes  138   e ,  138   f  may span only a portion of the respective lane  110   a ,  110   b  within which the second and third vehicles  102   b ,  102   c  are traveling. Further, the fifth and sixth drive envelope widths  142   e ,  142   f  may be less than the fourth drive envelope width  142   d . In this way, the requesting vehicle  102   a  may be granted enhanced road network usage privileges at least partly in response to a request for preferential travel. 
     In some examples, the vehicles  102  illustrated in  FIGS.  4   a - 7   b    may be driverless non-emergency passenger vehicles. In other examples, on the other hand, at least the requesting vehicle  102   a  illustrated in  FIGS.  4   a - 7   b    may comprise emergency response vehicles (e.g., ambulances, fire trucks, police cars, military vehicles, etc.), whether driverless or not. In any such example described herein, additional command signals may be sent to one or more traffic lights or other traffic control devices along the prioritized path. For example, such additional command signals may change all traffic lights to “green” along the prioritized path such that the requesting vehicle  102   a  may not have to stop at “red” traffic lights in emergency situations. Such situations may include, for example, situations in which a health emergency (e.g., a stroke, a heart attack, etc.) occurs within the requesting vehicle  102   a . In still further examples, any of the systems or methods described herein may also be employed by standard (e.g., non-driverless) vehicles. For example, a standard ambulance, fire truck, police car, or other non-driverless emergency vehicle, or a control system associated therewith, may provide a signal to one or more of the vehicles  102  that an emergency situation has occurred. In response, one or more of the vehicles  102  may be controlled to clear a path (e.g., a prioritized path) for one or more non-driverless emergency vehicles. In any of the examples described herein, one or more of the vehicles  102  may mimic an ambulance, fire truck, police car, or other emergency response vehicle in one or more ways. For example, upon receiving a command signal from the remote vehicle control system  154 , the vehicle controller  228  of the requesting vehicle  102  may cause one or more lights, sirens, horns, and/or other output components of the vehicle  102  to activate. In such examples, one or more lights, light bars, or other visual output devices of the vehicle  102  may be caused to flash as the vehicle  102  is controlled to traverse a prioritized path in the road network  104 . Additionally or alternatively, in such examples, one or more horns, sirens, speakers, or other audio output devices of the vehicle  102  may be caused to emit an audible tone as the vehicle  102  is controlled to traverse a prioritized path. In this way, such output may cause and/or enable other vehicles  102  in the road network  104  to move from or exit the drive envelope of the requesting vehicle  102  emitting such output without the other vehicles receiving a command signal causing such movement. 
     As noted above, in any of the examples described herein the sets of parameters included in the various command signals provided by the remote vehicle control system  154  may include instructions that cause the vehicle controllers  228  of the respective vehicles  102  to modify one or more performance parameters of the respective vehicles  102  (e.g., speed, acceleration, suspension settings, brake pressure settings, braking rates, engine settings, turbo settings, steering input rates, etc.) and/or operation parameters of the respective vehicles  102  (e.g., safety-related guidelines for controlling the vehicle). Additionally, although not specifically illustrated in  FIGS.  4   a - 7   b   , one or more conditions or events associated with the road network  104  may modify the travel paths, trajectories, drive lines, drive envelopes, and/or other parameters described herein. Such conditions or events may include accidents, school, and construction zones, flood zones, parade zones, special event zones, and/or zones associated with slow traffic, such as areas where vehicles are being driven into bright sunlight or areas where weather conditions such as rain or snow are affecting traffic rates. 
       FIG.  8    is a flow diagram of an example process illustrated as a collection of blocks in a logical flow graph. The various blocks shown in  FIG.  8    represent a sequence of operations that can be implemented in hardware, software, or a combination thereof. In the context of software, the blocks represent computer-executable instructions stored on one or more computer-readable storage media that, when executed by one or more processors, perform the recited operations. Generally, computer-executable instructions include routines, programs, objects, components, data structures, and the like that perform particular functions or implement particular abstract data types. The order in which the operations are described is not intended to be construed as a limitation, and any number of the described blocks can be combined in any order and/or in parallel to implement the processes. 
     In particular,  FIG.  8    is a flow diagram of an example method  800  for operating one or more vehicles (e.g., one or more driverless vehicles). At  802 , the example method  800  may include receiving, at the computing device  160  and/or other components of the remote vehicle control system  154 , sensor signals including sensor data  206  from one or more sensors  204  associated with a plurality of vehicles  102  (e.g., a plurality of driverless vehicles). In some examples, the sensor data  206  may be related to operation of the respective vehicles  102  to which the sensors  204  are connected. For example, the sensor data  206  may include sensor signals associated with the environment  100  through which the vehicles  102  are traveling. In some examples, the sensor data  206  may include sensor signals indicative of a respective location, speed, and/or other operational parameter of each vehicle  102  traversing the road network  104 . It is understood that each vehicle  102  may have one or more sensors  204  connected thereto, and in such examples, the sensor signals received at  802  may comprise respective signals generated by the sensors  204  connected to the various individual vehicles  102  in the road network  104 . Further, each vehicle  102  of the plurality of vehicles may have a number, alpha-numeric code, and/or other identifier assigned thereto and uniquely identifying the vehicle  102 . In such examples, the sensor signals received at  802  may also include the unique identifier corresponding to the vehicle  102  to which the one or more sensors  204  generating the signal is/are connected. 
     At  804 , the example method  800  may include receiving, at the computing device  160  and/or other components of the remote vehicle control system  154 , a request from one or more of the vehicles  102 , and such a request may comprise a request for preferential travel from a current location of the requesting vehicle  102  to a particular destination  124 . For example, while traversing the road  106 , a passenger of a first vehicle  102   a  may provide an input via the preferential travel input device  148  of the vehicle  102   a . For example, the passenger may provide such an input by actuating, pressing, moving, touching, and/or otherwise contacting the preferential travel input device  148 . Additionally or alternatively, the passenger may provide an input by speaking, waiving, making one or more hand gestures, and/or through other non-contact methods. Any such inputs may be indicative of a request for preferential travel within the road network  104  between the current location of the requesting vehicle  102   a  and the destination  124 , and the request may be generated by the preferential travel input device  148 , the vehicle controller  228 , and/or one or more other components of the vehicle system  202  at least partly in response to the input received from the passenger. Additionally, in some examples the request may include the unique identifier corresponding to the vehicle  102   a  from which the request is received (e.g., the requesting vehicle  102   a ). 
     At  806 , the example method  800  may include accessing, with the computing device  160  and/or other components of the remote vehicle control system  154 , road network data stored in, for example, a road network data store. The road network data may be based at least in part on a location of the vehicle  102   a . In some examples, this may include global and/or local map data that may be stored and/or updated by the vehicle  102   a  and/or by the remote control center  156 . Such road network data may include, among other things, data related to a global or local map of at least a portion of the road network  104  at which the vehicle  102   a  is located. The road network data may include, for example, one or more maps illustrating the various roads  106  that may be available for the vehicle  102   a  to reach the destination  124  from the current location of the requesting vehicle  102   a.    
     At  808 , the example method  800  may include determining, at the computing device  160  and/or other components of the remote vehicle control system  154 , a set of modified parameters for operating the requesting vehicle  102   a  as the requesting vehicle  102   a  travels within the road network  104  to the destination  124 . For example, under normal operating conditions (e.g., non-preferential travel conditions), each of the vehicles  102  may be controlled by the respective vehicle controllers  228  to operate according to nominal operating parameters governing movement of the respective vehicles  102  within the road network  104 . In some embodiments, the requesting vehicle  102   a  may be permitted and, in some situations, required to operate, within the road network  104 , in accordance with a first set of nominal operating parameters, while a second vehicle  102   b  may be permitted and, in some situations, required to operate, within the road network  104 , in accordance with a second set of nominal operating parameters. In some examples (e.g., in normal operating conditions), the first set of nominal operating parameters may be the same as the second set of nominal operating parameters, while in other examples the first set of nominal operating parameters may be different from the second set of nominal operating parameters. In any of the embodiments described herein, such sets of nominal operating parameters may include a speed threshold below which a respective one of the vehicles  102  may be permitted and, in some situations, required to operate, a drive line  146  along which the one of the vehicles  102  may be permitted and, in some situations, required to travel, a drive envelope  138  along which or within which the one of the vehicles  102  may be permitted and, in some situations, required to travel, traffic rules with which the one of the vehicles  102  must abide, and/or other rules or limitations for operating the one of the vehicles  102 . In some examples, the first and second sets of nominal operating parameters may be generated and/or otherwise determined by the remote vehicle system  154 , and may be provided to the respective vehicles  102   a ,  102   b  for operation thereof within the road network  104 . 
     Accordingly, in examples in which the first vehicle  102   a  is operating in accordance with the first set of nominal operating parameters described above and in which the second vehicle  102   b  is operating in accordance with the second set of nominal operating parameters, at  808  the remote vehicle control system  154  may determine a third set of parameters (e.g., a set of one or more modified parameters) for operating the first vehicle  102   a . The remote vehicle control system  154  may determine such a third set of parameters based at least partly on the request received at  804  and on the sensor data included in the sensor signals received at  802 . Additionally, the third set of parameters determined at  808  may be at least partly less restrictive than the first set of nominal operating parameters governing normal operation of the first vehicle  102   a . For example, where the first set of nominal operating parameters may define and/or otherwise include a first speed threshold below which the first vehicle  102   a  is permitted and/or required to operate, the third set of modified parameters determined at  808  may include a second speed threshold greater than the first speed threshold, thereby enabling the first vehicle  102   a  to travel at a higher speed. As another example, where the first set of nominal operating parameters may define and/or otherwise include a first strut setting, suspension setting, brake pressure setting, turbo setting, engine tuning configuration, and/or other vehicle parameter associated with normal and/or non-preferential travel, the third set of modified parameters may define and/or otherwise include a second strut setting, suspension setting, brake pressure setting, turbo setting, engine tuning configuration, and/or other vehicle parameter setting causing the first vehicle  102   a  to operate in a modified drive mode (e.g., a preferential travel mode, an emergency mode, etc.). In such a modified drive mode, the first vehicle  102   a  may be caused to operate in accordance with preferences or other settings of one or more passengers riding in the first vehicle  102   a . For example, the first suspension setting of the first set of nominal operating parameters may cause a strut or other suspension component of the first vehicle  102   a  to operate with a first level of sensitivity, and the second suspension setting of the third set of modified parameters may cause such a suspension component of the first vehicle  102   a  to operate with a second level of sensitivity greater than the first level of sensitivity. 
     As a further example, and as illustrated in at least  FIGS.  7   a  and  7   b   , where the first set of nominal operating parameters may be consumed by the path calculator  214  of the first vehicle  102   a  to define and/or otherwise determine a first drive envelope  138   a  (having a first drive envelope width  142   a ) along which or within which the first vehicle  102   a  is permitted and/or required to travel, the third set of modified parameters determined at  808  may be consumed by the path calculator  214  of the first vehicle  102   a  to define and/or otherwise determine a fourth drive envelope  138   d  (having a fourth drive envelope width  142   d ) and/or a prioritized path  708  along which or within which the first vehicle  102   a  is permitted and/or required to travel. In such examples, the fourth drive envelope width  142   d  may be greater than the first drive envelope width  142   a , thereby expanding the area of the road  106  within which the first vehicle  102   a  may travel in order to reach the destination  124 . 
     As noted above, the path calculator  214  of the first vehicle  102   a  may determine the fourth drive envelope  138   d  and/or the prioritized path  708  based at least partly on the set of parameters determined at  808 . Alternatively, in some examples, at  808  the computing device  160  and/or other components of the remote vehicle control system  154  may determine a prioritized path  708  extending from the first vehicle  102   a  to the destination  124  based at least partly on the request received at  804  and on the road network data received at  806 . In any of the examples described herein, the first vehicle  102   a  may be caused to travel along the prioritized path  708 , and the prioritized path  708  may be defined, at least in part, by the fourth drive envelope  138   d  described above may include and/or define such a prioritized path  70 . 
     At  810 , the example method  800  may include determining, at the computing device  160  and/or other components of the remote vehicle control system  154 , one or more additional sets of modified parameters governing the operation of various remaining vehicles traversing the road network  104 . For example, as noted above the second vehicle  102   b  may be caused to operate in accordance with a second set of nominal operating parameters. In such examples, at  810  the remote vehicle control system  154  may determine a fourth set of modified parameters for operating the second vehicle  102   b . The remote vehicle control system  154  may determine the fourth set of parameters based at least partly on the request received at  804  and on the sensor data included in the sensor signals received at  802 . Additionally, the fourth set of parameters determined at  810  may be at least partly more restrictive than the second set of parameters governing operation of the second vehicle  102   b.    
     For example, where the second set of nominal operating parameters may define and/or otherwise include a third speed threshold below which the second vehicle  102   b  is permitted and/or required to operate, the fourth set of modified parameters determined at  810  may include a fourth speed threshold less than the third speed threshold, thereby requiring the second vehicle  102   b  to travel at a lower speed. As another example, where the second set of nominal operating parameters may define and/or otherwise include a third strut setting, suspension setting, brake pressure setting, turbo setting, engine tuning configuration, and/or other vehicle parameter, the fourth set of modified parameters determined at  810  may define and/or otherwise include a fourth strut setting, suspension setting, brake pressure setting, turbo setting, engine tuning configuration, and/or other vehicle parameter setting causing the second vehicle  102   b  to operate in a relatively more relaxed or refined drive mode. For example, the third suspension setting of the second set of nominal operating parameters may cause a strut or other suspension component of the second vehicle  102   b  to operate with a third level of sensitivity, and the fourth suspension setting of the fourth set of modified parameters determined at  810  may cause such a suspension component of the second vehicle  102   b  to operate with a fourth level of sensitivity less than the third level of sensitivity. 
     As a further example, and as illustrated in at least  FIGS.  7   a  and  7   b   , where the second set of nominal operating parameters may be consumed by the path calculator  214  of the second vehicle  102   b  to generate and/or otherwise determine a second drive envelope  138   b  (having a second drive envelope width  142   b ) along which or within which the second vehicle  102   b  is permitted and/or required to travel, the fourth set of modified parameters determined at  810  may be consumed by the path calculator  214  of the second vehicle  102   b  to generate and/or otherwise determine a fifth drive envelope  138   e  (having a fifth drive envelope width  142   e ) along which or within which the second vehicle  102   b  is permitted and/or required to travel. In such examples, the fifth drive envelope width  142   e  may be less than the second drive envelope width  142   b , thereby reducing the area of the road  106  within which the second vehicle  102   b  may travel. In any of the examples described herein, the fourth set of parameters determined at  810  governing operation of the second vehicle  102   b  may also be at least partly more restrictive than the third set of parameters determined at  808  governing preferential travel of the first vehicle  102   a.    
     As noted above, the path calculator  214  of the second vehicle  102   b  may determine the fifth drive envelope  138   e  based at least partly on the set of parameters determined at  810 . Alternatively, in some examples, the computing device  160  and/or other components of the remote vehicle control system  154  may determine one or more additional drive envelopes based at least partly on the request received at  804  and/or based at least partly on the road network data accessed at  806 . Example first, second, and third drive envelopes  138 ,  406 ,  408  are described above with respect to  FIGS.  4   a  and  4   b   . Additionally, example first second, and third drive envelopes  138 ,  506 ,  508  are described above with respect to  FIGS.  5   a  and  5   b   , and various drive envelopes are also described above with respect to  FIGS.  6   a ,  6   b ,  7   a , and  7   b   . In any of the examples described herein, a second and/or additional drive envelope determined at  810  may maintain a corresponding second vehicle  102   b  and/or an additional one of the vehicles  102  outside of one or more trajectories (determined at  808 ) defining the drive line  146  of the requesting vehicle  102   a  as the requesting vehicle  102   a  travels to the particular destination  124  along a prioritized path. 
     At  812 , the example method  800  may include providing, with the computing device  160  and/or other components of the remote vehicle control system  154 , a first command signal to at least the requesting vehicle  102   a . For example, at  812  the computing device  160  may generate a first command signal including the set of modified parameters determined at  808 . As noted above, such a set of parameters may include information indicative of one or more trajectories, a drive line, a prioritized path, one or more drive envelopes, a speed threshold, a suspension setting, and/or other rules or vehicles operating parameters. At  812 , the computing device  160  may transfer, send, and/or otherwise provide the first command signal to the requesting vehicle  102   a  via the network  152  and using, for example, the transmitter  306 . Additionally, the network interface  234  of the first vehicle  102   a  may receive the first command signal at  812 , and the first command signal may cause the first vehicle  102   a  to operate in accordance with the set of modified parameters determined at  808 . For example, the vehicle controller  228  may consume and/or otherwise process the first command signal received at  812 , and the path calculator  214  of the requesting vehicle  102   a  may generate and/or otherwise determine a drive envelope defining, at least in part, a prioritized path extending from the requesting vehicle  102   a  to the destination  124  based at least in part on the set of modified parameters included in the first command signal. The vehicle controller  228  of the requesting vehicle  102   a  may also cause the requesting vehicle  102   a  to travel along and/or within the drive envelope when traveling along the prioritized path. In traveling within the drive envelope, the vehicle controller  228  may, in some examples, cause the requesting vehicle  102   a  to move from a first lane  110   a  to a second lane  110   b , or vice versa. The vehicle controller  228  may also cause the requesting vehicle  102   a  to make one or more turns, accelerate, decelerate, and/or perform one or more additional vehicle maneuvers in causing the requesting vehicle  102   a  to travel within the drive envelope and/or along the prioritized path at  812 . Additionally or alternatively, causing the first vehicle  102   a  to operate in accordance with the set of modified parameters included in the first command signal may cause the first vehicle  102   a  to accelerate from a first speed to a second speed greater than a first speed. The first command signal provided at  812  may also cause a suspension component of the first vehicle  102   a  to operate with an increased level of sensitivity. Further, the first command signal provided at  812  may cause the first vehicle  102   a  to travel within an expanded drive envelope and/or to operate within an increased speed threshold. 
     At  814 , the example method  800  may include providing, with the computing device  160  and/or other components of the remote vehicle control system  154 , a second command signal to a second vehicle  102   b  and/or to at least one of the remaining vehicles  102  traversing the road network  104 . For example, at  814  the computing device  160  may generate a second command signal including the set of modified parameters determined at  810 . Such a set of parameters may include information indicative of a path, drive envelope, speed threshold, suspension setting, and/or other rules or vehicle operating parameters. In some examples, the second command signal may also include information indicative of the one or more trajectories, drive line, drive envelope, prioritized path, and/or other modified parameters determined at  808 . In still further examples, the second command signal may also include additional information such as, for example, the unique identifier associated with the requesting vehicle  102   a , unique identifiers associated with one or more of the remaining vehicles  102  traversing the road network  104 , weather conditions, road conditions, traffic conditions, and/or other parameters associated with the road network  104 . At  814 , the computing device  160  may transfer, send, and/or otherwise provide the second command signal to at least the second vehicle  102   b  via the network  152  and using, for example, the transmitter  306 . In some examples, at  814  the computing device  160  may also transfer, send, and/or otherwise provide the second command signal to the requesting vehicle  102   a  via the network  152 . 
     At  814 , the vehicle controller  228  of, for example, the second vehicle  102   b  may receive the second command signal, and the second command signal may cause the second vehicle  102   b  to operate in accordance with the set of modified parameters determined at  810 . For example, the vehicle controller  228  of the second vehicle  102   b  may consume and/or otherwise process the second command signal received at  814 , and the path calculator  214  of the second vehicle  102   b  may generate and/or otherwise determine a drive envelope  406  ( FIG.  4   b   ) based at least partly on the set of modified parameters included in the second command signal. The vehicle controller  228  of the second vehicle  102   b  may cause the second vehicle  102   b  to travel within the drive envelope  406 . In traveling within the drive envelope  406 , the vehicle controller  228  of the second vehicle  102   b  may, in some examples, cause the second vehicle  102   b  to move from a first lane  110   a  to a second lane  110   b , or vice versa. The vehicle controller  228  of the second vehicle  102   b  may also cause the second vehicle  102   b  to make one or more turns, accelerate, decelerate, and/or perform one or more additional vehicle maneuvers in causing the second vehicle  102   b  to travel within the drive envelope. In particular, the vehicle controller  228  of the second vehicle  102   b  may control the second vehicle  102   b  to remain outside of one or more drive envelopes and/or trajectories (determined at  808 ) defining the drive line  146  of the requesting vehicle  102   a  as the requesting vehicle  102   a  travels to the particular destination  124  along a prioritized path. Additionally or alternatively, causing the second vehicle  102   b  to operate in accordance with the set of modified parameters included in the second command signal may cause the second vehicle  102   b  to decelerate from a first speed to a second speed less than the first speed. Further, the second command signal provided at  814  may cause the second vehicle  102   b  to travel within narrowed and/or otherwise reduced drive envelope and/or to operate within a reduced speed threshold. 
     At  814 , the method  800  may also include providing at least some of the information included in the various command signals via the preferential travel output device  150  of the respective vehicles  102 . For example, the vehicle controller  228  of the second vehicle  102   b  may consume and/or otherwise process the second command signal received at  814 , and the vehicle controller  228  of the second vehicle  102   b  may cause the display and/or other components of the preferential travel output device  150  to display at least part of the prioritized path (e.g., the prioritized path  604  illustrated in  FIG.  6   b   ), the drive envelope (e.g., the fourth drive envelope  138   d  illustrated in  FIG.  7   b   ), the drive line (e.g., the drive line  146  illustrated in  FIG.  5   b   ), one or more corresponding trajectories, and/or other parameters or sets of parameters. In such examples, the prioritized path  604  and/or the fourth drive envelope  138   d  may be displayed on and/or with a map or other like illustration of the road  106 . In such examples, at least part of the road network  104 , the destination  124 , and/or other portions of the environment  100  may also be displayed via the preferential travel output device  150 . Additionally or alternatively, at least one of the requesting vehicle  102   a , the second vehicle  102   b , the one or more remaining vehicles  102  traversing the road network  104 , an additional drive envelope (e.g., the drive envelope  710  illustrated in  FIG.  7   b   ), the unique identifier and/or other information identifying at least one of the vehicles  102  (e.g., the requesting vehicle  102   a ), and/or one or more of the modified parameters determined at  808  or  810  may also be displayed and/or otherwise provided. It is understood that such information provided by the preferential travel output device  150  may be updated in substantially real time and, the preferential travel output devices  150  in each of the respective vehicles  102  may provide similar and/or the same information. 
     In any of the examples described herein, the first, second, and/or corresponding additional command signals of the present disclosure may maintain the second vehicle  102   b  and/or any of the additional vehicles  102  traversing the road network  104  outside of one or more drive envelopes and/or trajectories of the requesting vehicle  102   a  as the requesting vehicle is traveling along a prioritized path to the destination  124 . As noted above, such trajectories may define a drive line  146  of the requesting vehicle  102   a , and the drive line  146  may be included in and/or may otherwise define a drive envelope  138  of the requesting vehicle  102   a . Such a drive envelope  138  may be included in and/or may define at least part of the prioritized path. In this way, the methods and systems of the present disclosure may be used to provide a requesting vehicle  102   a  with a prioritized path that extends from the requesting vehicle  102   a  to the destination  124 . As a result, the methods and systems of the present disclosure may enable passengers of vehicles (e.g., passengers of driverless vehicles) to travel to such a destination in an expedited manner in case of emergencies and/or other time-sensitive situations, and such methods and systems may improve passenger satisfaction. Such methods and systems may also result in reduced congestion or traffic in the road network  104  and may, thus, result in more efficient usage of the roads  106 , lanes  110 , and/or other portions of the road network  104 . 
     It should be appreciated that the subject matter presented herein may be implemented as a computer process, a computer-controlled apparatus, a computing system, or an article of manufacture, such as a computer-readable storage medium. While the subject matter described herein is presented in the general context of program modules that execute on one or more computing devices, those skilled in the art will recognize that other implementations may be performed in combination with other types of program modules. Generally, program modules include routines, programs, components, data structures, and other types of structures that perform particular tasks or implement particular abstract data types. 
     Those skilled in the art will also appreciate that aspects of the subject matter described herein may be practiced on or in conjunction with other computer system configurations beyond those described herein, including multiprocessor systems, microprocessor-based or programmable consumer electronics, minicomputers, mainframe computers, handheld computers, mobile telephone devices, tablet computing devices, special-purposed hardware devices, network appliances, and the like. 
     Although the subject matter presented herein has been described in language specific to computer structural features, methodological acts, and computer readable media, it is to be understood that the invention defined in the appended claims is not necessarily limited to the specific features, acts, or media described herein. Rather, the specific features, acts, and media are disclosed as example forms of implementing the subject matter recited in the claims. 
     The subject matter described above is provided by way of illustration only and should not be construed as limiting. Furthermore, the claimed subject matter is not limited to implementations that solve any or all disadvantages noted in any part of this disclosure. Various modifications and changes may be made to the subject matter described herein without following the examples and applications illustrated and described, and without departing from the spirit and scope of the present invention, which is set forth in the following claims.