Quote:
Originally Posted by Richard in NC
Precisely! The wind blowing over and under the bridge caused a wind chill and can freeze water on the bridge surface when the actual air temp is > 32.
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Wind chill isn't a real temperature; it isn't actually any colder than the ambient temperature. It is a virtual temperature that relates to how cold it feels on your skin. Cars and roads don't experience wind chill.
The 3C buffer simply allows for the risk that roads may be colder than ambient, and thus still have ice on them.
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