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Roadway deviation prevention system

  • US 6,064,301 A
  • Filed: 02/08/1999
  • Issued: 05/16/2000
  • Est. Priority Date: 02/10/1998
  • Status: Expired due to Fees
First Claim
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1. An on-vehicle transceiver for transmitting to data carriers installed in a road a vehicle presence signal for indicating presence of a vehicle, comprising:

  • an oscillator unit for generating said vehicle presence signal;

    a transceiver unit that transmits said vehicle presence signal to said data carriers and receives a warning signal for indicating presence of said data carriers that is transmitted from said data carriers based on said vehicle presence signal;

    an annunciator that informs a driver of the vehicle of the presence of said data carriers; and

    a speed detector unit for detecting the speed of the vehicle;

    wherein said annunciator is turned off when the detected speed is below a prescribed speed.

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