I’m assuming it has something to do with how thick the surface is? I see the sign that says this a lot when I drive and I want to know why. I was even stumped a while back when my nephew asked why because I didn’t have an answer
In: Planetary Science
The ground tends to hold its temperature better than the air, so when a road is on earth, only one side is in the freezing air, the other is insulated by the soil.
A bridge will not have this insulation. It has freezing temperatures above and below it, so it will be colder, and ice will form there first.
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