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Difficulty: EasyWinter Driving, Snow, and Black Ice

Bridges and overpasses freeze before other road surfaces in freezing temperatures because cold air circulates both above and below the roadway.

Answer: Answer

Answer

The statement is True. Bridges and overpasses freeze earlier than normal road surfaces during freezing conditions.
Elevated roadways lack the thermal insulation provided by the ground, allowing cold air circulating underneath to freeze surface moisture faster than on regular roads.

Step-by-Step Solution

1
Analyze the exposure of elevated structures versus ground-level roads to cold air.
Bridges and overpasses are exposed to ambient freezing air on both their top and bottom surfaces.
Air circulating underneath elevated roadways rapidly extracts thermal energy from the structure.
2
Compare the thermal insulation of ground-level roadways.
Earth under standard roads acts as a thermal mass that holds ground heat.
Ground warmth delays ice formation on standard roads compared to uninsulated elevated bridges.

Key Concept

Freezing hazards on elevated road structures during winter conditions
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Topics

Winter Driving, Snow, and Black Ice

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