Abstract:
A radio linked vehicle communication system for text messaging, traffic light control, resource management and traffic monitoring, designed to establish the location of emergency vehicles and related privately owned vehicles within their vicinity and have this information relayed to a third party using conventional electronic devices. Specifically to notify the privately owned vehicle or vehicles in close proximity of an emergency vehicle of their presence, so as to avoid possible accidents and to relay this information to a third party to be recorded and verified. Additional benefits of the system would be the ability of having interrogators, either mobile, aircraft of in a fixed location that could identify and personalize specific vehicles for investigation purposes and to provide a mobile repeater system.

Description:
FIELD OF THE INVENTION 
   This invention relates to the field of devices used to establish the location of emergency vehicles and related privately owned vehicles within their vicinity and to have this information relayed to the appropriate parties. Specifically, it is used to notify the privately owned vehicle or vehicles in close proximity to an emergency vehicle of the emergency vehicle&#39;s proximity, so as to avoid possible accidents and to relay this and identifying information to a third party to be recorded and verified. 
   BACKGROUND OF THE INVENTION 
   Operation of a motor vehicle anywhere in the world has become increasingly hazardous with the advent of the smaller, faster cars in combination with the larger cars, SUV&#39;s, small trucks, large trucks and other motor vehicles that have to be on the roads today. The act of policing and controlling the increasing volume of vehicles on the road has become a monumental task. Only through the aide of computers and computer aided emergency vehicles could the task of monitoring and identifying ever increasing numbers and types of motor vehicles be possible. Emergency vehicles including police cars, emergency medical service vehicles and fire fighting vehicles require short response times to be more effective. Such response times require that emergency vehicles proceed through traffic and intersections with great haste. Commonly, the only knowledge private vehicle operators have of a visually identifiable emergency vehicle is the flashing lights and siren. When the emergency vehicle is not visible to other drivers, the only hint to their presence is conventionally the sound of a siren. Such sounds can be deceiving as to the direction of travel and location of the emergency vehicle due to the bounce effect in cities and due to the potential of multiple emergency vehicles traveling in diverse directions to the same destination. 
   If the operator of a privately owned vehicle has early knowledge of approaching emergency vehicles, the threat of an accident decreases and the effectiveness of the emergency personnel in timely reaching their destination increases. All emergency services recognize this fact and most people consider response time when talking about public safety and living conditions in an area. Systems currently in place use a combination of audio and video stimuli to notify the surrounding vehicle traffic of approaching emergency vehicle traffic. These systems are hampered by many conditions; rain, fog, wind, speed of the vehicles and traffic conditions. Also the audio/video alert system, or siren, has to compete for the private vehicle operator&#39;s attention by overcoming the car stereo system or the talking passengers or the cell phone. One might also consider modern soundproofing of vehicles blocking noise exterior to the cabin interior to be detrimental to the effectiveness of sirens. This coupled with the fact that many drivers just don&#39;t pay attention to adjacent street traffic and their rear view mirror while driving is a further detriment to recognition of approaching emergency vehicles. 
   As noted, emergency vehicles approaching intersections depend upon sirens, horns, bells, or other types of audible and/or visible warning devices to alert other people of their presence especially in the area of the intersection of two or more roads. This has not always proven to be a completely successful technique with emergency vehicles, though it is still the standard mode of operation today. Unfortunately accidents involving emergency vehicles often occur at intersections due to confusion, impaired hearing, inattention, noise conditions or overly aggressive drivers seeking to clear the intersection before the arrival of the emergency vehicles. Very dangerous problems are often caused when multiple emergency vehicles are approaching the same intersection and cannot hear each others siren because of their own. 
   In 2000 1.2 million cars were stolen in the U.S. Sixty-two percent of the stolen vehicles were recovered but most of those had received damage. The thieves target late model popular cars for the parts and resale value. The cost of replacing or repairing stolen vehicles is a huge burden upon the insurance industry and ultimately upon all drivers. By stopping theft and recovering stolen vehicles quickly crime is mitigated and insurance rates decrease. 
   Ever since the terrorist attacks of Sep. 11, 2001 the Department of Homeland Security has been trying to pre-empt any further attacks. Part of accomplishing this is identifying possible terrorists and monitoring their actions for suspicious activity which may indicate attack planning. By being able to easily monitor suspect vehicles the Department of Homeland Security becomes more efficient and the terrorist threat is diminished. 
   Cameras have been used to monitor parking lots for years. They are used to identify thieves and criminals as they leave the seen of the crime. Often criminals are able to thwart the cameras by altering or covering their license plates. By being able to accurately identify vehicles in parking lots, criminals are more easily apprehended since they may be associated with individual vehicles captured on the camera and stolen vehicles recovered since they are easily uniquely identified. 
   This device and method herein disclosed describes a new and unique system designed to decrease the response time of emergency vehicles, increase the safety of surrounding private vehicles, both of which will result in the saving of many lives. While decreasing the response time of emergency vehicles is important, this system has many operational characteristics that could also be employed for the security and defense of the general public. 
   PRIOR ART 
   U.S. Pat. No. 6,252,519 (McKenna) describes an emergency vehicle signaling system wherein an emergency vehicle transmits an RF signal having a narrow cone calculated to be received in a second vehicle. The receiver for the second vehicle is equipped with an indicator in the form of a light which blinks in order to alert the driver of the emergency vehicle from the RF signal which it is transmitting which has been received by the second vehicle. Accordingly, occupants of the second or non-emergency vehicle are made aware of the presence of the emergency vehicle while the visual indicator confirms reception of the RF signal. Mckenna however does not disclose a means of communication between emergency vehicles or interrogators and privately owned vehicles or suggest the particular intricacies of the communication between the emergency vehicle and the privately owned vehicle and a third party base station. 
   U.S. Pat. No. 2001/0038344 A1 of (Garcia) teaches of an alarm system for alerting drivers and passengers of non-emergency vehicles to the approximate presence of an emergency vehicle which may be approaching the particular non-emergency vehicle. In one embodiment, an alarm, such as a blinking light or the like, is generated within the non-emergency vehicle or non-emergency vehicles. In another embodiment, a positioning system is also provided and displays the approximate position of the emergency vehicle, such that the driver or passengers of the non-emergency vehicle or vehicles may be apprised of the presence of and approximate location and direction of that emergency vehicle. The Garcia patent does not teach any means of communication between emergency vehicles or interrogators and privately owned vehicles in the same fashion or suggest the particular intricacies of the communication between the emergency vehicle and the privately owned vehicle and a third party base station described within the forgoing patent. 
   U.S. Pat. No. 6,326,903 B1 (Gross) discloses a system that allows operators of emergency vehicles to obtain graphic data regarding other emergency vehicles that may pose threats of collision. Automatic signaling takes place between emergency vehicles within range of each other to transmit directional data regarding the direction of travel of each emergency vehicle. This data is correlated to derive directional vectors relative to each other. These vectors are displayed so that the operator can quickly determine the direction of other vehicles with respect to his own. The system includes equipment for preempting traffic signals by selected emergency vehicles, and for informing other emergency vehicles that a traffic signal has been preempted. Gross however deals with the communication between two or more emergency vehicles and their respective location with each other and does not involve the communication with privately owned vehicles, interrogators or a base third party base station. 
   U.S. Pat. No. 2003/0016130A1 (Joao) additionally describes a control apparatus and method, including a first control emergency vehicle, located at a vehicle or premises, capable of controlling one or more of a plurality of at least one of a respective system, equipment system, component, device, equipment, and appliance, of a respective vehicle or premises, with a first signal. The first control device generates and/or transmits the first signal in response to a second signal generated by and/or transmitted from a second control emergency vehicle located remote from the vehicle. The second signal is automatically received by the first control device. The second control device generates and/or transmits the second signal in response to a third signal generated by and/or transmitted from a third control device located remote from the vehicle and the second control device. The third signal is automatically received by the second control device. Joao, much like the previous prior art, does not disclose the means of communication between emergency vehicles or interrogators and privately owned vehicles in the same fashion or suggests the particular intricacies of the communication between the emergency vehicle and the privately owned vehicle and a third party base station. 
   U.S. Pat. No. 2002/0008635 A1 (Ewing) teaches a warning system for alerting the driver of a private vehicle that an emergency vehicle is approaching. The system includes a receiver and a display panel mounted in the private vehicle, and at least two infrared receivers mounted on the private vehicle. The display panel mounted in the private vehicle includes an indicator that alerts the driver of the private vehicle to the approaching emergency vehicle as well as the direction to move in order to yield the right of way to an approaching emergency vehicle. A warning signal mounted in the emergency vehicle provides signals that allow the components of the emergency vehicle warning system mounted in the private vehicle to know that the approaching vehicle is an emergency vehicle. Ewing is involved with communicating between emergency vehicles and privately owned vehicles and it does not bring into play a interrogator, either mobile, aircraft or fixed location, and does not include the additional communication between a base station. 
   U.S. Patent No. US 6,516,273 B1 (Pierowicz et al.) relates to a system installed in a vehicle to: determine the location of the vehicle; identify each intersection as the vehicle approaches the intersection; determine the presence and type of traffic control device at that intersection; determine whether the traffic control device associated with the intersection in the direction of travel of the vehicle requires the vehicle to come to a complete stop; determine the acceleration required to stop the vehicle prior to its entry into the intersection; and, if the required acceleration exceeds a predetermined threshold alerts the driver by means of an aural, visual and/or haptic indication, to brake the vehicle prior to its entry into the intersection. The system may also preempt driver control of the breaking system and begin breaking the vehicle automatically prior to its entry into the intersection. In another embodiment of the invention, the system may determine the phase of the traffic light via a communications channel between the vehicle and the traffic light, repetitively check to see if the vehicle is entering the intersection in contravention of the traffic light&#39;s indication, and, if the vehicle does so begin to enter the intersection, then alerts the driver by means of an alarm or indication to brake the vehicle prior to its entry into the intersection. Ewing too lacks a means of communication between emergency vehicles or interrogators and privately owned vehicles in the same fashion or suggests the particular intricacies of the communication between the emergency vehicle and the privately owned vehicle and a third party base station described within the forgoing patent. 
   U.S. Pat. No. 2003/0052796 A1 (Schmidt et al.) describes a system for controlling vehicles within a traffic network. The vehicles have means for communication via a communication network, with a service mediator system, linking the vehicle&#39;s communication means to various servers. The vehicle may include a means for exchanging data between the vehicles&#39; software or hardware, while at least one of servers includes a means for processing said data related to the vehicles&#39; software or hardware, like fuel consumption and the vehicles&#39; maintenance state. This is also another patent that does not disclose any means of communication between emergency vehicles or interrogators and privately owned vehicles in the same fashion or suggests the particular intricacies of the communication between the emergency vehicle and the privately owned vehicle and a third party base station described within the forgoing patent. 
   Thus there is a continuing need for improving the means of communication and mutual identification between emergency vehicles and privately owned vehicles especially when the emergency vehicles are on a code 3 call which requires the fastest possible travel time using red lights and siren. None of the foregoing prior art teaches or suggests the particular intricacies of the communication between the entities or their relationship with a third party base station described within the forgoing patent. In this respect, before explaining at least one embodiment of the invention in detail it is to be understood that the invention is not limited in its application to the details of construction and to the arrangement, of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting the device herein disclosed. 
   SUMMARY OF THE INVENTION 
   A preferred embodiment of this invention consists of a radio linked interactive vehicle communication system for text messaging, traffic light control, resource management and traffic monitoring. It is best designed to establish the location of emergency vehicles and related privately owned vehicles within their current or future vicinity and to have messages relayed to the private vehicles as well as to a third party using conventional electronic devices. Specifically, the disclosed device alerts the privately owned vehicle or vehicles within a determined proximity of an emergency vehicle of their presence. This alert helps to avoid accidents and also allows for the additional relay of this information to a third party to be recorded and verified. Additional benefits of the system would be the ability of having electronic interrogators which transmit a signal which when received causes a determined response to be transmitted in return. The interrogators can be either mobile, aircraft or in a fixed location and once initiated could identify and personalize the identification of specific vehicles for investigation purposes. 
   The disclosed system installed in the emergency vehicle will include the interrogator system (transceiver and associated data processor), antenna, compass, or other means for directional travel determination, GPS receiver or other means for location determination, a computer and a user interface. The computer also would accept speed data from the vehicle in which it is installed. 
   Interrogators installed as fixed units may be installed at any location but typically are located at parking lots, border crossings or other areas of high traffic or vehicle congregation which may be of high interest. 
   The system installed in the privately owned vehicle will include the transponder (transceiver and associated processor), antenna and compass or other means to determine directional travel of the private vehicle such as a GPS unit or magnetometer. A means to determine the private vehicle speed can also be employed to aid in calculation of current and future location of the individual vehicle. 
   Transponders may also be installed as fixed units at any location but are typically installed at intersections as part of the traffic light control system and communicate information received to the traffic control system controlling the signal lights. 
   The primary components of the base station controller consist of the transceiver, antenna, computer and user interface to allow data input and review. These are typically located at dispatch locations. Base stations are typically controlled by the dispatcher but may be accessed remotely via telephone line or other communication system such as by radio link. 
   Any number of agencies may upload the base station controller computer with data on the identification regarding specific vehicles that may be of interest. For instance, the police may have a list of stolen vehicles that are wanted, while the Department of Homeland Security may have lists of vehicles of which it would like to know the whereabouts due to suspected terrorist activity. The base station controller can download these lists to emergency vehicles and maintain the data stored in each remote emergency vehicle computer automatically or when cued to do so. Along with the lists sent to the emergency vehicles is any other pertinent data that the system and operators may require. For instance, if a police vehicle finds a stolen car, the officer may be notified of the year, make, color, license plate and owner. But if an emergency medical service vehicle happens to identify a stolen vehicle, the emergency vehicle personnel wouldn&#39;t be notified. Instead the appropriate dispatcher is notified by a relay of that information from the emergency vehicle through the controller computer. This would make the various emergency vehicles automatic roaming sensors or scanners for vehicles of interest in their proximity without the need to bother the emergency personnel in those vehicles. 
   Another example may be the case when an interrogator identifies a vehicle that the Dept. of Homeland Security is looking for. In this case a message with the vehicle identification and location will be sent to the appropriate agency autonomously, without any knowledge or action required on the part of the emergency vehicle operator or the dispatcher. 
   An emergency vehicle interrogator typically is powered up and operating whenever the vehicle is also operating. The interrogator controls all communications with each privately owned vehicle, controlling each transponder&#39;s transmissions. The interrogator continuously transmits a signal on a pilot channel that will be received by any transponder within the designated range or that signal. Each transponder in the current favored embodiment of the device is always operating, even when the vehicle is not being operated. The transponder monitors the pilot channel waiting to receive the pilot signal from any interrogator. Information received from the pilot channel triggers the transponder to begin communication with the interrogator. Each privately owned vehicle transponder replies to the interrogator, as directed by the interrogator, with information that includes as its unique identification and its compass reading. Once the interrogator has received a response from a transponder, it can signal the transponder that it has received its response to the interrogation. This establishes a communication link and the private vehicle transponder then waits for any further commands from the interrogator. 
   The interrogator is able to resolve the distance to the transponder by analyzing a round trip ranging signal which is initiated by the interrogator. This signal is received by the transponder and re-transmitted to the interrogator along with a delay metric. The delay metric represents the amount of time that the transponder takes to retransmit the ranging signal. The interrogator processor calculates the distance using the delay metric and the amount of time taken to receive the round trip signal. The emergency vehicle computer processes the data received from the transponder and determines if any more communication or data is required from that transponder. Determination is made based upon the heading and proximity of the privately owned vehicle relative to the emergency vehicle and metrics input to the computer by the emergency vehicle operator. For instance, the emergency vehicle operator may have determined that he only wants to message to privately owned vehicles that are within ±15° of the emergency vehicle heading, and within 1 mile ahead of the emergency vehicle. The emergency vehicle operator may also select multiple messages, each to be displayed under different conditions based upon the heading and distance relative to the emergency vehicle. For instance, private vehicles that are traveling in a similar direction to the emergency vehicle and are less than 1 mile ahead may be triggered to display one message to their driver, vehicles traveling perpendicular to the emergency vehicle and less than ½ mile away may be triggered to display a different message to their driver, while vehicles less than 1 mile behind the emergency vehicle may be caused to display yet another message to their drivers, and those traveling opposite to the emergency vehicle may be ignored and display no message at all to their drivers. 
   The displayed message viewed by the individual private vehicle drivers may be one that is preprogramed into the transponder or it may be one that is composed by the emergency vehicle operator. In either case the emergency vehicle operator has complete control of which message to send to which vehicles based upon their proximity and heading relative to the emergency vehicle. Along with any text messages for display there may be transmitted other commands for stereo muting or audio/video alerts through the private vehicles audio or video system. Additionally, the emergency vehicle interrogators are able to communicate with one another to coordinate communications to privately owned vehicles and traffic light control. 
   Also, due to the fact that the emergency vehicles are able to automatically communicate with the base stations, emergency vehicle resources can be readily tracked and managed in an extremely efficient manner. This also facilitates recording of position data for later use. 
   It needs to be noted that many embodiments of the transponder antenna system exist and use of multiple antennas to determine the location of a specific transmitter is common practice. While one antenna and one receiver will work in this system, the more antennas, and possibly receivers, that are used will yield more precise location and directional information. There are no set guidelines for a multi-antenna system that may be used and anyone who is skilled in the art could design any number of systems that would work equally well. A very common system for determining direction is a diversity system where the phase of a signal received from two or more antennas is compared. Another system may employ RF director and/or reflector antenna elements and/or a rotating antenna. As such, those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for designing of other structures, methods and systems for carrying out the purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent construction insofar as they do not depart from the spirit and scope of the present invention. 
   THE OBJECTS OF THE INVENTION 
   An object of this invention is to identify and to send a message to other remote vehicles within a determined vicinity of emergency vehicles. 
   Another object is the ability of the emergency vehicle to selectively message using either or both of video or audio means to privately owned vehicles based upon that vehicles heading and individual proximity to the emergency vehicle. 
   An additional object of this radio linked vehicle communication system for text messaging, traffic light control, resource management and traffic monitoring is to allow emergency vehicles to remotely identify private vehicles electronically, not requiring them to read the license plate. 
   Yet another object of this invention is to allow emergency vehicles to control the traffic on roadways as well as the traffic lights at specific intersections when they are approaching during an emergency call. 
   A further object of this invention is to establish the precise location of the emergency vehicles and the related private vehicles within the vicinity of the emergency vehicle and have this information relayed to a third party. 
   Another object of this invention is to record and verify the information involved with an emergency vehicle on a specific emergency call. 
   Still another object of this invention is to allow authorities to identify stolen vehicles more readily, either from an emergency vehicle or from an airplane, helicopter or by fixed interrogators located in parking lots or elsewhere, without having to approach the suspect vehicle. 
   Yet another object is to coordinate the control of traffic lights when multiple emergency vehicles are approaching. 
   A still further object of this invention is to alert the drivers of private vehicles that they are in the vicinity of an approaching emergency vehicle on a call. 
   Yet still another object of this invention is to use the dispatch station or to create a central control station that will monitor, control, record and relay information to and from the respective vehicles. 
   A further object of this radio linked vehicle communication system for text messaging, traffic light control, resource management and traffic monitoring, is to create a safer environment on the streets for the operators of private vehicles as well as for the operators of emergency vehicles and for pedestrians. 
   These together with other objects of the invention, along with the various features of novelty, which characterize the invention, are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and the specific objects attained by its uses, reference should be made to the accompanying drawings and descriptive matter in which there are illustrated preferred embodiments of the invention. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of this invention. 
       FIG. 1  is a diagram of the communication between the police vehicle, emergency medical service vehicle, firefighting vehicle and other mobile aircraft fixed location with each other, the base station and the privately owned vehicle of the patent herein disclosed. 
       FIG. 2  is a diagram of the communication between the police vehicle, emergency medical service vehicle, firefighting vehicle and other mobile, aircraft or fixed location with each other, the base station system, and individual traffic light controller. 
       FIG. 3  is a diagram of the components of the Base station/dispatcher, emergency vehicles and privately owned vehicles and their relationship. 
       FIG. 4  is a diagram of the second component of emergency vehicle, fixed and airborne with the interrogator and computer and the information related to the computer. 
       FIG. 5  is a diagram a first component for mounting in a private vehicle and the related components and information. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Referring now to the drawing  FIGS. 1-5 , wherein similar parts of the invention are identified by like reference numerals, there is seen in  FIG. 1  a diagram of the various communication pathways of the disclosed system  10  showing the communication paths between the different elements within the system  10 . 
   In the simplest mode of the device  10  a first component  12  is mounted in the private vehicle and communicates with the vehicle power supply for appropriate electrical power. The first component  12  will include the transponder  14  which would include a transceiver to broadcast and receive radio transmitted data. An antenna  16  would communicate with the transceiver to transmit and receive by radio waves. Also included in this first component  12  would be a means to determine directional travel of the private vehicle shown as direction sensor  18  such as one or a combination of devices including a compass, GPS unit or magnetometer. A means to determine the private vehicle speed can also be optionally employed to aid in calculation of future location of the individual vehicle. Also included in this vehicle mounted first component  12  would be a means for visual display of indicia shown as dashboard display  19  which would be a Liquid Crystal, cathode ray, Light emitting diode, or other screen type display. 
   A microprocessor or similar computing device  17  is programed with control functions to operate the individual parts of the first component  12 . 
   A second component  22  of the system  10  would be mounted upon mobile emergency vehicles and communicate with the electrical system of that vehicle for the required power to operate the second component  22 . An interrogator  20  of the second component  22  communicates with a computer  24  which is programed with the appropriate software for the operation herein described. Communicating with the computer is a means to determine the speed of the emergency vehicle shown as speed sensor  26  and a means to determine directional travel of the emergency vehicle shown as directional sensor  28 . A user interface  30  such as a keyboard and monitor allows the user to input data and operational instructions to the computer  24  and a means to determine location such as GPS device  32  provides the computer  24  with real time location information. 
   Each transponder  14  in a current favored embodiment of the device  10  defaults to an operating or “on” condition and therefor would work best if always operating, even when the vehicle is not being operated. In operation in the simplest embodiment the transponder  14  monitors the pilot channel seeking to receive pilot signals from any interrogator  20  which is mounted on the second component  22  of the device  10  in one or a plurality emergency vehicles having such second components  22 . Information broadcast by any interrogator  20  on the pilot channel will trigger the transponder  14  to begin communication with the interrogator  20  and to reply to the interrogator  20  in a manner directed by the interrogator  20 , with information that includes a unique identification of the vehicle in which the responding first unit  12  is mounted and its direction of travel. Once the interrogator  20  has received the response from a transponder  14 , it signals the transponder that it has received its response to the interrogation allowing the transponder  20  to cease. This handshake establishes a communication link between the private vehicle transponder  14  and the emergency vehicle mounted interrogator  20  and initiates the transponder  14  to wait for any further commands from the interrogator  20  as to data required. 
   The second component  22  is able to resolve the distance to the transponder  14  of the first vehicle mounted component by analyzing a round trip ranging signal transmitted by the interrogator  20 . This signal is received by the transponder and re-transmitted to the interrogator along with a delay metric. The delay metric represents the amount of time that the transponder takes to retransmit the ranging signal and provides a means to determine distance of the first component  12  from the second component  22  and the distance between the respective vehicles in which they are mounted. The interrogator processor calculates this distance using the delay metric and the amount of time taken to receive the round trip signal. The second component&#39;s computer  24  processes the data received from the transponder  20  and determines if any more communication or data is required from that transponder  20 . 
   A warning determination is determined by the computer  24  using onboard software suitable to the task based upon the heading and proximity communicated by the first component  12  in the privately owned vehicle relative to the second component  22  mounted in the emergency vehicle and metrics input to the computer by the emergency vehicle operator. Using predetermined criteria which may be included in the programming of the computer software or using the user interface  30 , the operator of the emergency vehicle in which the second component is mounted can determine that it is necessary to warn or otherwise communicate with the vehicle in which the first component  12  is mounted. This need for the emergency vehicle to communicate with one or a plurality of other privately owned vehicles in which first components  12  are mounted and communicating with the second component  22  in the emergency vehicle is therefor determined by the computer  24  in the emergency vehicle based on data communicated to it. One or a plurality of different messages as to location, heading, and type of emergency vehicle in which the second component  22  is mounted can be broadcast to communicating transponders  14  in remote vehicles to warn them of the,presence of the emergency vehicle. If a warning is determined to be in order for any of the communicating transponders  14  it will be broadcast by the interrogator  20  to the vehicle and displayed to the occupant on the dashboard display  19 . The warnings or non-warnings would vary based on the heading and proximity of the remote vehicles with transponders  20  and the heading and speed and location of the emergency vehicle with the second component  22  mounted therein. This makes the device  10  very adaptive to the conditions at hand and avoids warnings being transmitted to other vehicles outside the determined proximity and headings determined to require such a warning. This enhances the device&#39;s performance in that needless warnings, which could cause an accident themselves by distracting drivers, are avoided and provides a. means to eliminate warnings to remote vehicles not determined to require them. 
   The displayed message viewed by the individual private vehicle drivers may be one that is preprogramed into the transponder  20  or it may be one that is composed by the emergency vehicle operator in real time thereby providing an adaptive messaging system to allow the emergency vehicle to issue very precise warnings or information if needed during an emergency. In this simplest form of the device, the first component  12  communicating with an emergency vehicle mounted second components  22  would provide a real time, adaptive means to warn proximate vehicles as well as a means to eliminate such warnings or information transmissions to vehicles not within the parameters determined to require the warning. 
   In another preferred mode of the device  10  a third component would be provided in the form of a base station  32  and a traffic light controller  34 . Also, each emergency vehicle having a second component  22  such as a Police Vehicle, Emergency Medical Service Vehicle, Firefighting Vehicle, Civil Defense Vehicle or Other Mobile Aircraft Fixed Location, is able to communicate with any of the base station or the other emergency vehicles, aircraft, of fixed location, to coordinate their individual and group communication with the privately owned vehicles having the first component  12  onboard as well as with the traffic light controller  34 . Since the traffic light controller  34  controls the lights and signaling of traffic at intersections, it is especially important that the emergency vehicles communicate with each other as well as the traffic light controller  34  to only change the lights in a manner that will not result in a collision of emergency vehicles. It thus provides a means to control signal lights to prevent two emergency vehicles from changing the lights to green at the same time and prevents any collisions that this would cause between emergency vehicles. 
   The base station  32  as noted above is able to communicate with each emergency vehicle or mobile aircraft or fixed location independently. Each second component  22  in each emergency vehicle would have a unique identification code that would provide an electronic means to identify each emergency vehicle. Using this identification code as well as the information from the speed sensor  26  and direction sensor  28  and the location sensor  32 , the base station can provide dispatchers with real time information on the location, speed, and direction of each emergency vehicle and also calculate a time of arrival for any of them to a designated destination. This provides dispatchers using a display of this information communicated from the base station  32  the ability to track and better allocate emergency resources. 
   In another preferred embodiment of the device  10  the second units  22  mounted in any emergency vehicle can also track and/or seek identification and location information about specific vehicles having the first component  12  operatively mounted therein. This tracking and reporting ability would be done in the background by the interrogator  20  and computer  24  communicating with the base station  32  and with individual vehicles having a first component  12 . In one preferred mode of a means to track vehicles, the interrogator  20  would continuously emit a signal on the pilot channel causing any transponder  14  in range to respond with a unique identification number for the vehicle in which the transponder  14  is mounted. These identification numbers along with data as to the proximity of the reporting vehicle and its direction would be received by the interrogators  20  mounted in any emergency vehicle having broadcasting the signal on the pilot channel. Once received the identification number or code of individual vehicles along with their proximity to the emergency vehicle receiving the information along with the direction of travel of the individual identified vehicles can be transmitted to the base station. From a database in a computer at the base station, the individual identification number or code relayed from the interrogator  20  of the emergency vehicle would be compared, and if a stolen, lost, or otherwise identified vehicle of interest is found in the comparison, it could be further tracked by the base station  32  using one or a plurality of second units  22  in one or a plurality of emergency vehicles. 
   In this fashion, a moving web of interrogators  20  could continually seek out and report on vehicles which report an identification number or code showing they are stolen, are known to be driven by a terrorist, or are otherwise of interest to law enforcement. Further, once identified, a suspect vehicle could be tracked by this moving web using a plurality of different emergency vehicles to seek out and retransmit location, speed, and direction information on identified vehicles of interest. Further, if a second unit  22  is placed at a border or airport or parking lot, it could continually seek out vehicles that are identified as subjects of interest by law enforcement. Should it be desirous to limit the information received from transponders  14  reacting to the broadcasts from interrogators  20  which is relayed to the base station  32 , a list of vehicle identification numbers or codes could be downloaded into the computer  24  of one or a plurality of emergency vehicles causing identification information of responding vehicles transponders  14  to only be re-transmitted to the base station  32  if it matches the downloaded numbers or codes. This method would allow for the base station  32  and dispatchers running it, to look for suspect private vehicles in a narrow search in a specific geographic area occupied by certain emergency vehicles, or to look throughout a city using every emergency vehicle having an interrogator  20 . By allowing communication between all of the interrogators  20  mounted in all of the emergency vehicles, information transmitted from a interrogator  20  very remote from the base station  32  can also be relayed to the base station  32  through one or a plurality of emergency vehicles interrogators  20  situated between the very remote unit and the base station  32 . This would help communications in hilly terrain or cities with large buildings. 
   Finally, as shown in  FIG. 2 , because the second components  22  mounted in each of the emergency vehicles have the ability to transmit to each other as well as to the base station  32  and to also communicate with the traffic light controllers  34 , they provide a means for the base station  32  to communicate with and operate individual traffic light controllers  34 . This intercommunication between the various emergency vehicles essentially provides a repeater system to allow the base station  32  to send a message to any emergency vehicle that can be relayed to it through one or a plurality of the second components  22  in other emergency vehicles. Communicating with individual traffic light controllers  34  would also be done in the same fashion by sending out a control code via radio from the base station which will cause and individual traffic light controller to change the lights on an individual signal light. Using this individually coded signal, the base station can relay it through the system of second components  22  mounted in individual emergency vehicles who in turn would relay the control signal to the traffic light controller  34  for which the control signal is intended. This essentially provides a mobile repeater which uses one or a plurality of the emergency vehicles having second components  22  to receive and retransmit the signal from the base station  32  until it reaches its intended recipient. 
   The radio linked vehicle communication system for text messaging, traffic light control, resource management and traffic monitoring shown in the drawings and described in detail herein discloses arrangements of elements of particular construction and configuration for illustrating preferred embodiments of structure and method of operation of the present invention. It is to be understood, however, that elements of different construction and configuration and other arrangements thereof, other than those illustrated and. described may be employed for providing a radio linked vehicle communication system for text messaging, traffic light control, resource management and traffic monitoring in accordance with the spirit of this invention. Any and all such changes, alternations and modifications as would occur to those skilled in the art are considered to be within the scope of this invention as broadly defined in the appended claims.