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Systems and method for controlling preemption of a traffic signal

  • US 8,884,783 B2
  • Filed: 02/24/2011
  • Issued: 11/11/2014
  • Est. Priority Date: 02/24/2011
  • Status: Active Grant
First Claim
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1. A priority control unit for use with light-based and GPS-based traffic control priority systems, wherein the light-based traffic control priority system activates preemption of a traffic signal in response to pulses of light encoding a priority request, and the GPS-based traffic control priority system activates preemption of a traffic signal in response to a radio signal encoding a priority request, comprising:

  • a light emitter subsystem configured to emit pulses of light that encode a priority request for activating preemption of a traffic signal by the light-based traffic control priority system;

    a GPS-based subsystem configured to transmit a priority request by radio waves, the priority request for activating preemption of a traffic signal by the GPS-based traffic control priority system;

    a shared communications bus coupled to the light emitter subsystem and to the GPS-based subsystem; and

    a switch coupled to the light emitter subsystem and to the GPS-based subsystem, wherein the switch simultaneously activates both the light emitter subsystem and the GPS-based subsystem for transmitting priority requests in response to user control.

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