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Distance warning device for vehicles

  • US 3,892,483 A
  • Filed: 11/10/1972
  • Issued: 07/01/1975
  • Est. Priority Date: 11/11/1971
  • Status: Expired due to Term
First Claim
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1. A distance warning installation for vehicles, especially for motor vehicles, characterized in that each vehicle is equipped with two transmitter means mounted substantially at roof height to the left and right of the vehicle for transmitting radiant energy toward the rear and with a forwardly directed receiver means disposed at the front end of the vehicle for receiving the same type of radiant energy, said transmitter means radiating each a directional beam rearwardly with predetermined inclination both with respect to the plane of the road surface as well as with respect to the vehicle longitudinal center plane and thus an area of increased radiation intensity results at a predetermined distance to the rear of the vehicle which can be detected by a receiver means of a following vehicle, and in that upon impingement of the increased radiation intensity area of the directional beams transmitted by the transmitter means of a preceding vehicle on the receiver means of a following vehicle, a control signal is automatically produced by said receiver means.

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