I bought a slip warner for my car the other day. Amazing what nice stuff you can find at clas ohlson. It warns when the temperature is between +3.0°C and -1.0°C, -7.0°C and -9.0°C. The most critical regions are between +1.0°C and -1.0°C, -8.0°C and -9.0°C. The lower limit warns for when the road salt has no effect.
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