> Nissan is developing a system that alerts the existence of ice on the > > road...
> >
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> Could be a little late. There was a schematic for an Ice Detector in
> Popular Electronics when I was in Tech school...in 1979...
>
> All that was was a glorified thermometer that hung under the front bumper
> of the car and would light a bulb or sound an alarm if the temp under the > car reached