Why do bridges and overpasses freeze easier than regular roads?
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Why do bridges and overpasses freeze easier than regular roads?
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it just snowed and iced here in Houston
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littelbro14
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Because they have the cold air not only flowing above them, but also below them, as opposed to the road, which has the less-temperature-conductive ground beneath. |
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TP
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My guess is because bridges and overpasses have more surface area (all 4 sides) that are covered by cold air. As for roads, it's only the top surface (1 side) being exposed to air. It's under side is buried underground not exposed to any cold air. |
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Sponge B
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Bridges and overpasses have a higher surface area to volume ratio. They lose heat faster than a road on the ground, just as a mouse will lose heat faster than an elephant, which is why the elephant has big ears. |
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John g
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because there is no ground keeping the road warm |
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gib
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Wind goes over and under the bridge and it will freeze very fast. It is not like a normal road where the ground helps to insulate it from the cold. |
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itsmetrea
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Because of the wind, you get the wind chill factor which is a few degree's lower depending on the speed of the wind. And if you have any moister in the air you get freezing conditions on Bridges and overpasses. |
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Shane J
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Because there's cold air on top and on the bottom of the bridge or overpass. With a road, you only have cold air on the top. |
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Michael B
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Cold air flows under the bridges and overpasses and it makes the surface cold fast. |
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UCANTCME
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The ground itself is very insulating, and provides warmth (why many animals burrow in winter).
Anything in direct contact with the ground will freeze last.
Bridges and overpasses do not have the benefit of ground contact, therefor they freeze over like anything completely exposed to the air.
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