The road surface of a bridge may be dangerous in winter because it may remain icy after the rest of the roadway is clear.

False.
True.
Explanation

Bridges can remain icy in winter longer than other road surfaces due to their exposure to colder temperatures from all sides. Additionally, bridges lack the insulation provided by the ground, allowing them to cool down faster and stay colder. This combination of factors makes bridges more hazardous to drive on compared to the rest of the roadway.

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