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Traffic preemption system signal validation method

  • US 7,307,547 B2
  • Filed: 06/01/2005
  • Issued: 12/11/2007
  • Est. Priority Date: 06/01/2005
  • Status: Active Grant
First Claim
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1. A secure optical-communication traffic-preemption system, comprising;

  • an optical emmitter adapted to transmit light pulses that represent an encrypted code that is an encryption using a time-varying encryption key of at least an identification code; and

    a traffic light circuit havingan optical detector located at a traffic location and adapted to receive the transmitted light pulses, anda decoding circuit adapted to respond to the received light pulses by attempting to validate the included identification code and, in response to validating the included identification code, generate a traffic-preemption command for a traffic light at the traffic location.

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