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Remote control system for traffic signal control system

  • US 4,162,477 A
  • Filed: 06/03/1977
  • Issued: 07/24/1979
  • Est. Priority Date: 06/03/1977
  • Status: Expired due to Term
First Claim
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1. A multiple priority remote control system responsive to at least two different optical energy signals transmitted from vehicles approaching a traffic intersection defined by at least two intersecting roadways for the remote control of a traffic control system for the intersection having a controller for controlling red, yellow and green traffic signal lights, the controller including a control switch for selectively connecting electrical power to the traffic lights with a timing control for timing the operation of the control switch, the remote control system includinga first detector means for the intersection for detecting the optical energy signals transmitted from vehicles approaching the intersection along one roadway for the intersection;

  • said first detector means having an output at which a signal is produced when an optical signal is detected;

    a second detector means for the intersection for detecting the optical energy signals transmitted from vehicles approaching the intersection along another roadway for the intersection;

    said second detector means having an output at which a signal is produced when an optical signal is detected;

    a signal discriminator means operatively connected to said output of said first detector means for providing first and second control signals, said first control signal provided in response to detection by the first detector means of at least one of the optical energy signals, said second control signal provided in response to detection by the first detector means of a predetermined one of the possible optical energy signals;

    said signal discriminator means operatively connected to said output of said second detector means for providing third and fourth control signals, said third control signal provided in response to detection by the second detector means of at least one of the optical energy signals, the fourth control signal provided in response to detection by the second detector means of the predetermined one of the possible optical energy signals;

    a control circuit operatively connected to the controller, said signal discriminator means and the green light circuits of the traffic signal lights for each roadway of the intersection, said control circuit responsive to any one of said control signals for placing said control switch under the control of said control circuit to present the green light associated with such initial control signal except when said any one of said control signals is said first control signal and said fourth control signal is presented while said first control signal is present, said control circuit then responding, as though said fourth control signal was said any one of said control signals, to present the green light associated with said fourth control signal and except when said any one of said control signals is said third control signal and said second control signal is presented while said third control signal is present, said control circuit then responding, as though said second control signal was said any one of said control signals, to present the green light associated with said second control signal.

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