Abstract:
A system and method for monitoring participant security in a rideshare environment is provided. A rideshare participant device is made available to at least one rideshare participant during a rideshare. A security check is triggered while the rideshare is in progress. An action is performed based on the security check during which security information is gathered regarding the rideshare participant device. The security information is analyzed for any inconsistencies. A security response provider is contacted when the inconsistency is identified.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This patent application is a continuation of U.S. patent application Ser. No. 11/801,874, filed May 11, 2007, pending, the priority filing date of which is claimed, and the disclosure of which is incorporated by reference. 
     
    
     FIELD 
       [0002]    This application relates in general to ridesharing in a transportation system and, in particular, to a system and method for monitoring participant security in a rideshare environment. 
       BACKGROUND 
       [0003]    Interaction with transportation systems is a daily fact of life for most everyone. Whether it is a public bus system or private car, getting from one place to another seems increasingly more difficult and costly. Road congestion, burdensome fuel prices and environmental concerns beg for alternatives. Existing alternatives each have their own pluses and minuses. For example, public transportation is relatively inexpensive and safe, but participants are restricted to certain routes and schedules that are unlikely to meet everyone&#39;s needs. Use of a private car personalizes routes and schedules, but is expensive in terms of fuel, pollution, and required road infrastructure. 
         [0004]    Rideshare programs have been proposed that attempt to match public riders with private drivers. In a rideshare program, a private driver agrees to provide transportation to a rider traveling in generally the same direction at generally the same time. A significant advantage to these rideshare programs is the more efficient use of resources, including cars, fuel and roads. Participants might be slightly inconvenienced in terms of routes and schedules to accommodate the needs of other riders. There are transaction costs to matching riders with drivers in terms of both time and compensation, which must be worthwhile to all parties to encourage use of the system. Examples of rideshare systems are described in U.S. Pat. No. 4,360,875, issued Nov. 23, 1982 to Behnke and U.S. Pat. No. 6,697,730, issued Feb. 24, 2004 to Dickerson, the disclosure of which are incorporated by reference. 
         [0005]    Rideshare programs may also introduce issues for participants not present when they make their own way. For instance, besides destination and time, there may be issues with compatibility and compensation. Participants are prudent to be concerned with their own security when matched with participants previously unknown to them. Monitoring the security of the participants during the trip and the success of the rideshare would also be of benefit. There exists a need to encourage the participation of participants in a rideshare program, to match participants based upon compatibility and to enhance the security of the participants while participating in the rideshare. The present invention provides such methods and systems, among the other advantages described below. 
       SUMMARY 
       [0006]    A rideshare method and system is provided that includes, among other aspects, rideshare transaction matching, participant security, participation incentives and rideshare system financing. Rideshare participant devices are made available to rideshare participants. The rideshare participant devices have both communication capabilities and provide location information. An embodiment of the rideshare system communicates with the rideshare participants to facilitate rideshare transaction matching and to provide participation incentives. The rideshare participant device is also employed by the rideshare system to monitor and track the rideshare transaction while it is in progress. 
         [0007]    Participant security in rideshare transactions is provided. The rideshare system monitors the rideshare transaction while in progress and determines the security of the rideshare participants. In an embodiment, one or more of the rideshare participant devices are monitored in near real time. Information obtained from the rideshare participant device is analyzed for anomalies that might indicate a security concern. For example, the location of the participant device during the rideshare transaction can be compared to a trip route and a security alert triggered if that location deviates from the expected trip route by more that a predetermined threshold. The trip route may further be specified by the rideshare system to account for communication connectively advantageous to near real time monitoring. Other concerns, such a route visibility to the public and the availability of emergency services may be utilized in the selection of the trip route. 
         [0008]    In another embodiment, rideshare participant devices are available to a plurality of rideshare participant. For example a driver and a passenger each have access to a rideshare participant device. The rideshare system monitors and utilizes the plurality of rideshare participant devices to provide security. The rideshare system may communicate security inquires to rideshare participants via their rideshare participant devices when a security alert is determined. Responses to the security inquiry may be confirmed by the rideshare system against pre-arranged confirmation tokens, such as personal identification numbers or biometric information. The rideshare system may also compare location information obtained from the participant devices to determine anomalous conditions, such as when the location of the rideshare participant devices diverges before the rideshare transaction is expected to conclude. 
         [0009]    A further embodiment provides a method for monitoring participant security in a rideshare environment is provided. A rideshare participant device is made available to at least one rideshare participant during a rideshare. A security check is triggered while the rideshare is in progress. An action is performed based on the security check during which security information is gathered regarding the rideshare participant device. The security information is analyzed for any inconsistencies. A security response provider is contacted when the inconsistency is identified. 
         [0010]    A further embodiment provides a system and method for monitoring participant security in a rideshare environment. A rideshare participant device is made available to at least one rideshare participant during a rideshare. A security check is triggered while the rideshare is in progress. Action is taken based on the security check. A security inquiry message is communicated to the rideshare participant via the rideshare participant device. A reply to the security inquiry message is requested from the rideshare participant. A security response provider is contacted during at least one of when the reply indicates that there is a security problem and when the rideshare participant does not respond within a predefined response time threshold. 
         [0011]    A still further embodiment provides a method for monitoring participant security in a rideshare environment. A rideshare participant device is made available to at least one rideshare participant during a rideshare. Location information is collected for the rideshare participant device while the rideshare is in progress. The location information is monitored for abnormalities indicating a security alert. A security action is taken in response to the security alert. A security inquiry message is communicated to the rideshare participant device and a reply is requested. A security response provider is contacted during at least one of when the reply indicates that there is a security problem and when the rideshare participant did not respond within a predefined response time threshold. 
         [0012]    Still other embodiments of the present invention will become readily apparent to those skilled in the art from the following detailed description, wherein are described embodiments by way of illustrating the best mode contemplated for carrying out the invention. As will be realized, the invention is capable of other and different embodiments and its several details are capable of modifications in various obvious respects, all without departing from the spirit and the scope of the present invention. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not as restrictive. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]      FIG. 1  is a block diagram showing, by way of example, a rideshare transaction utilizing location determining communication systems. 
           [0014]      FIG. 2  is a block diagram of an exemplary rideshare system. 
           [0015]      FIG. 3  is a block diagram of an exemplary rideshare matching transaction system. 
           [0016]      FIG. 4  is a block diagram of an exemplary rideshare participation incentives component. 
           [0017]      FIG. 5  is a block diagram of exemplary rideshare revenue business methods. 
           [0018]      FIG. 6  is a block diagram of an exemplary rideshare security system. 
           [0019]      FIG. 7  is a state diagram illustrating a general scenario for server-based security checks. 
           [0020]      FIG. 8  is a state diagram illustrating a general scenario for device based security checks. 
           [0021]      FIG. 9  is a state diagram illustrating an exemplary location security monitor. 
           [0022]      FIG. 10  is a state diagram illustrating an exemplary tracking signal loss security monitor. 
           [0023]      FIG. 11  is a state diagram illustrating an exemplary unexpected participant separation security monitor. 
           [0024]      FIG. 12  is a state diagram illustrating an exemplary unexpected stop security monitor. 
       
    
    
     DETAILED DESCRIPTION 
     Rideshare System Overview 
       [0025]    An overview of a rideshare system  100  is shown in  FIG. 1 . A rideshare is broadly defined as a transaction between a driver  102  and a passenger  104  that results in the transportation of the rideshare participants  102 ,  104  to a destination  106  along a route  108 . The driver  102  provides transportation using a vehicle such as an automobile  110 . Other forms of transportation may be provided, such as airplanes, trains or vans. 
         [0026]    Each participant  102 ,  104  has available to him or her a rideshare device  112 ,  114 . The rideshare device  112 ,  114  has communication capabilities and a location determining capabilities. The rideshare device  112 ,  114  communicates with a location broadcast station  120  and a communication broadcast station  130 . Commonly, the location broadcast station  120  is a satellite, such as a global positioning satellite provided by the United States government. Examples of communication broadcast stations  130  include cellular towers, WI-MAX broadcasters, WiFi broadcasters, walkie-talkie and other forms of radio communication. The location broadcast station  120  and the communication broadcast station  130  may be combined into any convenient form, satellite or terrestrial. 
         [0027]    The rideshare device  112 ,  114  may be any type of presently known or future developed communication device. Communication systems are quickly being combined such that computer devices are providing various combinations of voice, text, e-mail, instant messaging, video, pictures and other forms of communication between devices. For example, the rideshare device  112 ,  114  may be a cellular telephone with GPS (global positioning satellite) capabilities. GPS capabilities enable determining the three spatial coordinates of the device and the fourth dimension of time at or near when that determination is made. The location of the device generally refers to the three spatial coordinates of the device at a particular time. 
         [0028]    To simplify the following discussion, the rideshare device  112 ,  114  will generally be discussed as if it is a cell phone with GPS capabilities, but limitation to this type of device is not intended. The participant device  112 ,  114  includes, or has access to, a location system such as GPS or other locating strategies. GPS systems determine location by measuring the time differentials for location signals  126 ,  128  coming from GPS satellites  120  orbiting the earth. Similarly, a cellular telephone, or similar device, can be located by triangulating communication signals  132 ,  134  originating from the device  112 ,  114  received at a plurality of broadcast stations  130 . 
         [0029]    A rideshare system  160  interfaces with the rideshare devices  112 ,  114  through the communication broadcast station  130 . The rideshare system  160  arranges and administers a rideshare transaction between a driver  102  and a passenger  104 . The rideshare transaction occurs along a route  108  starting at an origin  105  and concluding at a destination  106 . As discussed below, the rideshare system  160  determines a driver location  170  using the location capabilities of the driver device  114 . The driver location  170  may be the origin  105  or any point along the route  108  as the vehicle  110  is in transit. A pickup location  172  is determined from the location capabilities of the passenger device  112 . The application  172  need not be the actual location of the passenger device  112 , for instance a safer nearby pickup location may be specified by the rideshare system  160 . Safety functions provided by the rideshare system  160  include the monitoring of a trip location  174  as the passenger  104  shares the transport  110  with the driver  102 . 
         [0030]    The rideshare system  160  includes a number of subsystems shown generally in block form in  FIG. 2 . The rideshare system  160  may be used in a number of transportation contexts and locations. For example, the rideshare system  160  may support commuting in different metropolitan areas within the same or different countries. A rideshare support system  210  provides a localization module  212  that may provide directions and instructions translated for, or otherwise tailored to, a particular location. A map module  214  provides transportation maps, for example roadmaps of the transportation coverage area administered by the rideshare system  160 . Navigation systems support  216  provides navigation functions such as driving directions and may be interfaced with location determining systems such as GPS or the location determining functions of the participant devices  112 ,  114 . 
         [0031]    A rideshare match transaction system  220  generally includes functions for matching participants  102 ,  104  in a rideshare transaction. A rideshare security module  230  tracks and monitors the participants  102 ,  104  during the rideshare transaction. The various components  210 ,  260  of the rideshare system  160  employ a communication system  240 . For example, the rideshare match transaction system  220  may utilize the participant devices  112 ,  114  to arrange a rideshare transaction and also to track and monitor participant security via the rideshare security module  230 . The communication system  240  may also interface the components  210 ,  260  of the rideshare system  160  via wired or wireless communications systems, such as a wide area network, local area network, or cellular communication network. 
         [0032]    Rideshare accounting system  250  provides functions for the monetary and non-monetary administration of the rideshare system, for example, tracking and accounting for: rideshare transactions; financial negotiations for rideshare between participants  102 ,  104 ; fees and commissions that may be taken by the rideshare system  160 ; revenues generated by the rideshare revenue business methods  260 ; expense allocations; and, rideshare participation incentives. Rideshare revenue business methods  260  provide profit and financing alternatives for the rideshare system  160 . 
       Participant Matching 
       [0033]    Turning to  FIG. 3 , the ride matching transaction system  220  includes a participant match component  330 , a ride match component  350 , a financial negotiations component  360  and a rideshare participation incentives component  370  that in various combinations match rideshare participants  102 ,  104  using dimensions beyond just a shared route. The participant match component  330  matches participants  102 ,  104  using either or both social and security considerations. The identification of a participant is performed by a participant identification component  332 . The identification may be confirmed by the participant component  332 , for instance, by biometric input, video input or passwords. Background information associated with the identity of the participant can be referenced and utilized by a background checker component  334 . 
         [0034]    Participants  102 ,  104  can also be matched by a social network component  336  using social network information maintained by either the rideshare matching transaction system  220  or third party social network systems. For example, a driver  102  may wish to only be matched to passengers  104  identified as friends (first degree relationships) or friends of friends (second degree relationships). A participation-scoring component  338  may maintain information documenting the participation of the participants  102 ,  104 . The participation information may include such values as the number of successful rideshare transactions that the participant has participated in, feedback scores from other participants that have participated in rideshare transactions with the subject participant or recommendations from other rideshare participants. 
         [0035]    The shared interest-scoring component  340  determines and compares either or both biographic or behavioral information. Examples of biographic information might include gender, age, hobby, profession and music preferences. Examples of behavioral information might include smoking or non-smoking preferences. The participant match component  330  may utilize information other than that directly associated with a participant. For example, a vehicle information component  342  may obtain and utilize information pertaining to the characteristics of the vehicle  110 , such as vehicle size, number of available seats, insurance safety ratings and the like. Vehicle maintenance and safety inspections are other examples of information associated with the vehicle  110  that may inform a participant  104  directly, or the participant match component  330  automatically, to arrange a rideshare match transaction. 
         [0036]    The participant match component  330  also provides for a preferences component  344 , which may require, or give preference to, certain participants or classes of participants. For example, priority may be given to corporate sponsored users, participants with nearby home or work locations, participants with good participant ratings, or participants with certain group associations. 
         [0037]    The ride match component  350  includes systems and methods for the transportation specifics of the rideshare transaction. A route match component  352  determines a route  108  that corresponds to a location  170 , a proposed pickup location  172  and a destination  106 . To coordinate a route  108  that meets the criterion of the ride location  170 , the pickup location  172  and the destination  106 , the route match component  352  may determine a suitable route with a route-planning component  354 . A pickup and drop-off alternatives component  356  may suggest an alternative pickup or drop-off location that complies with route planning objectives, such as choosing routes with consideration for the safety of the participants, as is discussed in more detail below. The ride match component  350  may also undertake the negotiation of elements that the participants may be flexible with, for example negotiating the time of pickup using a time negotiation component  358 . 
         [0038]    The rideshare matching transaction system  220  may also include a financial negotiations component  360 , whereby the participants negotiate compensation for the rideshare transaction. For example, a ride auction component  362  may administer bidding between one or more passengers  104  for a seat in a vehicle  110  along a particular route  108 . The rideshare matching transaction system  220  may also take into account rideshare participation incentives administered by a rideshare participation incentives component  370 . 
       Participation Incentives 
       [0039]    A block diagram of the rideshare participation incentives component  370  is shown in  FIG. 4 . Participation incentives encourage the use of the rideshare program by a diverse group of participants. These participation incentives may be monetary or non-monetary. For example, participants may be awarded prizes or recognition, as well as, cash and discounts. Tie-in promotions are advantageous with the providers of insurance services, wireless communication plan providers, and navigation systems, to name only a few examples. Participation incentives provided by the rideshare participation incentives component  370  include providing a free or discounted navigation system  402  for vehicle  110  and giving free or discounted insurance  404  against liability occurring while participating in the rideshare program. Free or subsidized wireless communication plans  406  and free or subsidized vehicle cleaning services  408  may also be offered as incentives. A rideshare participation incentive  370  might also include inducements  418  to actively participate in the rideshare system  160 ; for instance, a driver  102  may be given graduated fee credits tied to the percentage of time a driver  102  makes his vehicle  110  available for rideshare transactions. 
         [0040]    Examples of monetary participation incentives include cash payments  410 , sharing of revenue  412  collected by the rideshare program, or credit against fees  414  charged by the rideshare program. For many participants, a primary advantage of participating in a rideshare program is the benefit to the environment. Recognition, in the form of carbon credits  413 , is a powerful incentive to those participants. A carbon credit is a value assigned to quantify the savings in carbon emissions caused by the participant&#39;s choice to engage in the rideshare transaction. The value of a sale of carbon credits may extend beyond just recognition, as there is a market developing to trade carbon credits for monetary and other consideration, such as offsetting rights to generate carbon from other activities. 
       Revenue Business Methods 
       [0041]    Referring to  FIG. 5 , the rideshare system  160  provides rideshare revenue business methods  260 . Revenue may be provided to operate the rideshare system  160  may include monthly fees  510  or per transaction fees  512 . Fees may be adjusted, up or down, based upon the monitoring of supply and demand  514 . For example, when there are more passengers  104  then drivers  102  seeking transportation on a given route  108 , the demand based monitoring component  514  may increase the transaction fee  512 . Similarly, if there are more drivers  102  offering transportation on a route  108  then there are passengers  104  willing to participate, the demand base component  514  may lower transaction fees  512  to encourage additional passengers  104  to participate in a rideshare transaction. As discussed above, or rideshare auctions  516  may be conducted directly between rideshare participants  102 ,  104 , setting the price of the rideshare transaction through bidding. The rideshare system  160  may take a percentage of these ride auctions. 
         [0042]    The rideshare revenue business methods  260  may also include revenue sources originating beyond the participants of the system. For example, advertisements  518  may be sold to third party advertisers for display on interfaces provided by the participant devices  112 ,  114 . Third party organizations may offer sponsorships  520  compensating the rideshare program  160  and permitting the third party organization to obtain the public relations value of supporting a worthy program. Third party organization may also benefit by providing reward programs  522  subsidizing rideshare transactions. Providers of products used in the navigation system  115  may also provide promotional tie-ins, such as giving memberships in the rideshare system  160  with the purchase of a navigation system  524 . 
         [0043]    Insurance is a significant issue in any rideshare system and an opportunity for revenue. Systems and methods for insurance integration  526  derive revenue from the integration of insurance coverage with the rideshare system  160  for example; low cost, month-to-month insurance premiums can be collected to provide users with additional insurance coverage that protects them while participating in a rideshare transaction. Supplemental insurance policies may also be offered on a per rideshare transaction basis that insure against liability incurred during the rideshare transaction. These supplemental insurance policies could be charged on a per rideshare transaction basis or on a monthly unlimited rideshare transaction basis. The rideshare system  160  could act as the insurer or share in the revenues generated from these supplemental insurance policies, for instance, by collecting something similar to an agent&#39;s a fee. 
       Rideshare Security 
       [0044]    The rideshare security system  230  is further described with reference to  FIG. 6 . A security match module  610  provides participant matching functions  612  with a security focus. The security match module  610  may be implemented as an extension of the rideshare matching transaction system  220 . A safety testing function  614  might test for indicators that a driver  102  is intoxicated, for instance by asking the driver  102  to solve a puzzle or demonstrate response time through the driver device  114 . A visual identity  616  or biometric identifier  618  are matching functions that match identities at the time the passenger  104  is picked up by the driver. For example, either or both of the participants  102 ,  104  could be sent a picture of the other participant  102 ,  104  for viewing on their participant device  112 ,  114  when the participants  102 ,  104  meet at the pickup location  172 . The identity of either or both of the participants  102 ,  104  may be confirmed at the pickup location using biometric information associated with that participant, by communicating  620  with the rideshare system using the participant device  112 ,  114 . 
         [0045]    A rideshare transaction monitor module  630  sets conditions for and monitors the security of the rideshare participants  102 ,  104  while the rideshare transaction is in progress. The transaction monitor module  630  works in conjunction with a rideshare security timer  650 . The rideshare security timer  650  triggers monitors  634 - 640  to assess the safety of the participants  102 ,  104  at periodic intervals  652 , randomly  654  or at scheduled times  656  during the rideshare transaction. For example, the rideshare security timer  650  might periodically request from a participant to provide a security response to an active participant monitor  638 . Similarly, a passive participant monitor  636  measures and reports a metric using a participant device  112 ,  114 , but without the active participation of the participant  102 ,  104 . 
         [0046]    Some security functions are monitored in real-time  658 . Real-time monitoring occurs at or near an event and is subject to communication lags and other technical limitations. For example, a location monitor  634  may monitor the location of the vehicle  110  in real-time as the vehicle traverses the route  108 . The location of the vehicle may be determined using the location capabilities of either participant device  112 ,  114  or using a navigation system  115  associated with the vehicle  110 . If either of the participant devices  112 ,  114  or the navigation system  115  deviates from the route  108  by more that a pre-defined threshold, the rideshare security system might take a security action. Examples of the security scenarios are discussed below. 
         [0047]    The rideshare security system  230  may also respond to asynchronous notifications initiated by a participant device  112 ,  114 . For example, an emergency button  642  would be communicated  620  to the rideshare security system  230 , which might initiate a security response, such as contacting a security response provider  670 . Other security monitoring, whether initiated by the rideshare transaction monitor module  630  or a participant device  112 ,  114 , asynchronous or synchronous, periodic, random, scheduled or monitored in real-time, are possible and contemplated by the present invention. 
       Examples of Rideshare Security 
       [0048]    The following examples of the rideshare security systems and methods are broadly separated into server-based and device-based strategies. A server-based security check is initiated by a server associated with the rideshare system  160  and interacts with either or both of the participant devices  112 ,  114  or a navigation device  115 . A device-based security check is initiated by a participant device  112 ,  114  and interacts with the server to evaluate the security alert and administer a security response, when appropriate. Security checks may include either or both active participant checks, which anticipate the participation of the participant in the security check, and passive participant checks, which judge information obtained without the active participation of the participant. These categories are defined for the purposes of simplifying the following discussion and are not intended as limitations. Also, while examples of security checks may be discussed individually for clarity, those taught or suggested by the examples may be used in various combinations in the embodiments of the invention. 
         [0049]      FIG. 7  is a state diagram illustrating exemplary server-based security checks. A server  702  triggers  710  a security check  712 . The trigger  710  may be periodic, random or scheduled. The security check  712  may include an active participant check  714 , a passive participant check  716 , or both. For instance, an active participant check  714  may include sending a message to a participant device  112 ,  114  and requesting a reply message. The reply message may include an indication of the participant&#39;s perception of the security situation, and an identity token such as a password or biometric confirmation. If the reply is confirmed  718 , the security state is determined to be OK  720 , which is reported  722  to the security check  712 . If the active participant check  714  fails, a security alarm  730  is raised and reported  732  to the server  702 . 
         [0050]    A security check  712  may also request a passive participant check  716  that checks security information against metrics generally without the participation of the participant  102 ,  104 . If the metric is confirmed  724  to be within a range determined to be safe, the security state is determined to be OK  720  and is reported to the security check  712 . When the metric is determined to be out of range  726 , a security alarm  730  is raised. The security alarm  730  notifies  732  the server  702  of the unsafe security situation. The server  702  may then take appropriate action, such as performing other security checks to verify the security situation or reporting that security situation to a security response provider  670 , such as the police. 
         [0051]      FIG. 8  is a state diagram illustrating exemplary device-based security checks. A device based security check is generally monitored by a participant device  112 ,  114 . The security check may be either automated or responsive to something that a participant  102 ,  104  initiates. For example, a security parameter  802  is provided by a server  702  or directly programmed into a participant device  112 ,  114 . A parameter check  804  monitors the status of information obtained from the participant device  112 ,  114  and maintains a status of security OK  806  as long as the information stays within pre-defined boundaries  808 . If the information goes out of bounds, the participant device  112 ,  114  may direct the process to either an active participant check  810  or a passive participant check  820 . For example, the active participant check  810  may request a reply from the participant and indicate that the security situation is OK  806  if the reply is confirmed  812 . If the participant replies that there is trouble  814  or no reply  816  is received, then the process moves to a state of security alarm  830 . A passive participant check  820  may check confirming metrics and either confirm  822  that security is OK  806  or the metric indicates a problem  824 , triggering a security alarm  830 . The security alarm  830  may then take further action by notifying a centralized server  832  or taking a direct action  834 , for instance, by notifying a security provider. An emergency button  838  may directly cause entry into the security alarm  830 . 
         [0052]      FIGS. 9-12  illustrate exemplary embodiments of security monitoring systems and methods, which can either be implemented as server-based or device-based. Turning to  FIG. 9 , a security monitor determines the location of a participant device  112 ,  114  compares that location to an expected route  108  and triggers a security alarm when an anomaly is detected. The route  108  may be agreed to by the rideshare participants  102 ,  104 , assigned by the transaction monitor  630  or other supporting server. In embodiments that either allow or force the assignment of the route  108 , the transaction monitor  630  may choose a route based in part upon a safety profile of the route. The safety profile may take into account such factors as the exposure of the route to the public, the availability of communication connectivity along the route, and the anticipated law enforcement presence along the route. 
         [0053]    Once the route  108  is determined, the location monitor  900  enforces the route assignment  902  by conducting a location check  904  at periodic, random or scheduled intervals. The trip location  174  is determined from either or both of the participant devices  112 ,  114  or a navigation system  115  associated with the vehicle  110 . If the trip location  174  is within pre-defined boundaries associated with the route  108 , the security status is considered in-bounds  906  and the security situation is maintained as OK  908 . If the trip location  174  is not within the predefined boundaries associated with the enforced route assignment  902 , the location monitor  900  may trigger an off-route  910  active participant check  912 , or may trigger an off-route  914  passive participant check  916 . A no reply  920  or a trouble reply  922  generates in a security alarm  930 . If the reply is confirmed  913 , the process returns to a security ok state  908 . A passive participant check  916  may seek to verify the security situation, for instance by measuring other security-associated metrics, such as vehicle speed. The vehicle speed may be computed from the location information provided by either the participant devices  112 ,  114  or the navigation system  115  and the timestamps associated with that location information. If the metric is confirmed acceptable  917 , the process returns to a security ok state  908 . The security alarm  930  is entered if the metric is outside acceptable parameters  919 . 
         [0054]      FIG. 10  illustrates an exemplary monitor  1000  that tracks the participant devices  112 ,  114  in near real-time and responds if the signal from either of those devices becomes unavailable. If the tracking signal is lost  1002 , a no reply condition  1004  may move directly to a security alarm state  1010 . The monitor  1000  may also seek to determine if there is a condition that explains the signal loss, such as querying  1018  a communication network  1020  for its status. If there is a problem with the network  1022 , the security state may be set to a security ok state  1024 . The security alarm  1010  is moved to if the network status is confirmed as ok  1026 . The monitor  1000  may also query active participant devices  112 ,  114  to determine the status of the lost signal or to determine helpful information, for instance, a starting location for a participant search, which is forwarded to the security alarm  1010 . 
         [0055]      FIG. 11  illustrates an exemplary monitor  1100  that tracks the participant devices  112 ,  114  in near real-time and responds if the location information derived from those devices indicates that there has been an early and unexplained separation of the participants  102 ,  104 . The early participant separation state  1102  notes an anomaly, it may inquire  1104  by moving to an active participant check state  1106 , which sends a message requesting a reply to either or both of the participants  102 ,  104 . If the replies  1108  are deemed to be sufficient to indicate there is no security situation, the security state may be reset to OK  1110 . Otherwise, if there is no reply  1112  or a reply indicating that there is a security problem  1114 , then a security alarm state  1116  is moved to. The early participant separation state  1102  may also inquire  1120  using a passive participation check  1122 , which further analyzes the security situation. Security Okay state  1110  indicates that a security situation does not exist  1124 . Security alarm state  1116  indicates a security problem  1126 . 
         [0056]      FIG. 12  illustrates an exemplary monitor  1200  that tracks the participant devices  112 ,  114  in near real-time and responds if the location information derived from those devices indicates that there has been an early and unexplained stop of either or both participant devices  112 ,  114  or the navigation system  115 . If an unexpected stop state  1202  notes an anomaly, it may wait a pre-defined amount of time for the participants  102 ,  104  and the vehicle  110  to begin moving again, and to reset  1204  to security OK  1210  if the time limit is not exceeded. If the time limit is exceeded  1206 , the state is moved to an active participant check state  1220 , which sends a message requesting a reply to either or both of the participants  102 ,  104 . If the replies are confirmed  1222  and deemed sufficient to indicate there is no security situation, the security state may be reset to OK  1210 . Otherwise, if there is no reply  1224  or a reply indicates that there is a security problem  1226 , and then a security alarm state  1230  is moved to. The unexpected stop state  1202  may also inquire  1240  using a passive participation check  1242 , which for further analyzes the security situation and moves  1244  to a security okay state  1210  if it is satisfied that a security situation does not exist. 
         [0057]    The methods and systems of the present invention can encompass embodiments in hardware, firmware, software, or a combination thereof. Hardware includes commercially available or proprietary computer systems having a processor for executing program instructions and memory for storing those instructions. 
         [0058]    While the invention has been particularly shown and described as referenced to the embodiments thereof, those skilled in the art will understand that the foregoing and other changes in form and detail may be made therein without departing from the spirit and scope of this disclosure. Further, presently unforeseen or unanticipated alternatives, modifications, variations, or obvious improvements therein may be subsequently made by those skilled in the art, which are also intended to be encompassed by the following claims.