Emergency vehicle traffic signal preemption system

Communications: electrical – Override of traffic control indicator by command transmitter

Reexamination Certificate

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Details

C340S907000, C340S916000, C701S300000

Reexamination Certificate

active

06940422

ABSTRACT:
An emergency vehicle traffic light preemption system for preemption of traffic lights at an intersection to allow safe passage of emergency vehicles. The system includes a real-time status monitor of an intersection which is relayed to a communications controller for transmission to emergency vehicles as well as to a central dispatch office. The system also provides for audio warnings at an intersection to protect pedestrians who may not be in a position to see visual warnings or for various reasons cannot hear the approach of emergency vehicles. A transponder mounted on an emergency vehicle provides autonomous control so the vehicle operator can attend to getting to an emergency and not be concerned with the operation of the system. Activation of a Code 3 situation provides communications with each intersection being approached by an emergency vehicle and indicates whether the intersection is preempted or if there is any conflict with other approaching emergency vehicles. On-board diagnostics handle various information including heading, speed, and acceleration sent to a communications controller which is transmitted to an intersection and which also simultaneously receives information regarding the status of an intersection.

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Co-pending U.S. Appl. No. 10/704,530, filed Nov. 7, 2003, entitled Method and System for Beacon/Heading Emergency Vehicle Intersection Preemption.
Co-pending U.S. Appl. No. 10/811,075, filed Mar. 24, 2004, entitled Emergency Vehicle Traffic Signal Preemption System.
Co-pending U.S. Appl. No. 10/696,490, filed Oct. 28, 2003, entitled Method and Appratus for Alerting Civilian Motorists to the Approach of Emergency Vehicles.
Co-pending U.S. Appl. No. 10/965,408, filed Oct. 12, 2004, entitled Traffic Preemption System.
Co-pending U.S. Appl. No. 10/942,498, filed Sep. 15, 2004, entitled Forwarding System for Long-Range Preemption and Corridor Clearance for Emergency Response.
Co-pending U.S. Appl. No. 10/960,129, filed Oct. 6, 2004, entitled Detection and Enforcement of Failure-to-Yield in an Emergency Vehicle Preemption System.
Co-pending U.S. Appl. No. 10/410,582, filed Apr. 8, 2003, entitled Emergency Vehicle Control System Traffic Loop Preeption.

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