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Method and apparatus for controlling and/or limiting speed excess by drivers

  • US 5,654,891 A
  • Filed: 10/13/1993
  • Issued: 08/05/1997
  • Est. Priority Date: 08/17/1992
  • Status: Expired due to Term
First Claim
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1. Method for controlling and limiting speed excess by drivers of a moving vehicle comprising the steps of:

  • placing millimeter wave transmitting means at limits of a geographical area along a road where speed control is desired to transmit at least time, distance between adjacent transmitting means and associated maximum speed limit information;

    providing the vehicle with a smart-card reader with cryptographical protection and with protection that makes impossible any physical access into electronic circuitry of the reader, and in which a smart-card with driver-identification data is to be inserted during operation of the vehicle;

    receiving, in the moving vehicle, at least the time (t1, t2) and distance (d1) information transmitted from the transmitting means during passage thereof by the moving vehicle;

    evaluating the information received in the moving vehicle to determine a speed value from the time and distance information and, in case of a determined speed value exceeding a received speed limit value (v1), storing at least the determined speed value in a physically protected memory on that vehicle and connected to the card reader;

    subsequently checking the stored speed values by an authority by inserting a control card in the card-reader to read out and then erase the respective content of the memory.

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