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Method and apparatus for advance warning signalling to a motorist of an ice condition on a driving surface

  • US 4,926,163 A
  • Filed: 02/01/1989
  • Issued: 05/15/1990
  • Est. Priority Date: 02/01/1989
  • Status: Expired due to Term
First Claim
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1. A traffic signalling device for detecting the presence of a hazardous driving condition and for signalling either a hazardous or safe driving condition at a preselected distance therefrom, the device comprising a bidirectional, thermal sensitive sensor adapted to provide preselected mechanical forces in response to a preselected temperature range relative to the freezing temperature, and signalling means coupled to said thermal sensitive sensor to be bilaterally movably responsive to the mechanical forces generated by the sensor with increases and decreases of temperatures over said temperature range, said signalling means being adapted for signalling the temperature changes sensed by the thermal sensor over the preselected temperature range to provide a visual signal representative of either a safe or hazardous driving condition in response to the mechanical forces generated by said sensor in response to the sensed temperatures whereby a "warm" sensed temperature provides a first signal and sensed freezing temperature provides a second signal and any sensed temperature between warm and freezing temperature provides a third signal that is a combination of the first and second signals proportioned in accordance to their relationship to the freezing temperature.

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