In cold, wet weather, roads on bridges and overpasses:

Do not freeze because they are made of concrete.
May be less slippery than roads on flat surfaces.
Tend to freeze before the rest of the road does.
Tend to freeze before the end of the road does.
Explanation

Always exercise caution and adjust your driving behavior when approaching bridges and overpasses in cold, wet weather. Bridges and overpasses freeze before other roadways because they are surrounded by cold air on both the top and bottom surfaces. This makes them more susceptible to icing, even when other pavement is not icy.

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