conversely, overpass bridges will freeze up first - often with black ice, as they aren't sitting directly on a large mass of heat holding earth. Overpasses can freeze up quickly when temps drop and freezing air blows over a wet road.
this is why they have road signs showing "bridge freezes over"
Bridges and elevated roads like the Gardiner get a lot of ice.
The cold wind blows not only on top, but also underneath.
It freezes on both the top and the bottom.
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