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Road condition monitoring devices

  • US 3,891,979 A
  • Filed: 10/23/1973
  • Issued: 06/24/1975
  • Est. Priority Date: 11/07/1972
  • Status: Expired due to Term
First Claim
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1. A device for detecting the danger of ice or snow on roads, comprising an electrical ground temperature sensor, an electrical salt content sensor, said sensors being adapted to be applied to the road surface, means connected to said sensors for comparing the ground temperature with the freezing point of the particular salt soluton present, and means for producing a warning signal when the ground temperature approaches the freezing point of the solution on the road surface.

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