why, during a snow or other wintery weather, do overpasses and bridges freeze up and become slippery first
In: Chemistry
Earth is a good insulator, it takes a lot longer for it to cool down than the air above it. An ordinary road will have cold air about it and warm earth below.
An elevated road has cold air above and below it, and is cut off from the earth’s reservoir of heat, thus will low heat much more quickly. Also, if the road is above a body of water, the air will be more humid and ice will form more quickly.
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