I have no idea either. But from my knowledge, I think it’s because they are extended above the ground. The higher, the colder the air is with a breeze adds to that as well since its constantly getting hit with that. Combine all that together with any little amount of precipitation, that just may be part of the reason.
Edit: downvote me. although above everyone else above has similar answers lol
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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