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Emergency traffic signal preempt system

  • US 5,083,125 A
  • Filed: 06/29/1990
  • Issued: 01/21/1992
  • Est. Priority Date: 06/29/1990
  • Status: Expired due to Fees
First Claim
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1. An emergency traffic signal control system, comprising:

  • means for generating at least an access code (ACODE), a direction code (DCODE) and a ranging signal (RPULSE);

    an intersection based transmitter/receiver, electrically coupled to said means for generating said codes, said intersection based transmitter/receiver generates an RF signal and impresses said generated codes upon said RF signal and directionally transmits said RF signal as forward tones;

    a vehicle based receiver/transmitter which receives said transmitted forward tones;

    signal processing means, electrically coupled to said vehicle based receiver/transmitter, for processing said received forward tones and returning said received forward tones as return tones, to said vehicle based receiver/transmitter for return transmission to said intersection transmitter/receiver; and

    means for validating said return tones and controlling the traffic signals in response to validated return tones and to said ranging signal, said means being electrically coupled to said intersection transmitter/receiver and to said means for generating an RF signal. PG,19

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