New Hampshire Driver's Education Practice Exam

Bridges freeze before roads because

More sunlight on roads than on bridges Cold air circulates above and below the bridge Bridges are treated with extra anti-freeze Traffic on bridges reduces ice formation on the surface

Correct Answer:

Cold air circulates above and below the bridge

Explanation:

Bridges freeze first because they lose heat to cold air on both sides. The bridge deck is exposed above and below, so convection pulls heat away from the surface from all around, causing it to chill and ice to form more quickly. Roads sit on the ground, which retains heat from the earth and sun, so they stay warmer longer and ice forms later. The other ideas don’t fit as well: sunlight alone isn’t the deciding factor, anti-freeze treatment isn’t a normal factor for road surfaces, and traffic doesn’t reliably prevent ice.

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