Bridges Freeze First, Posing Danger for Drivers

Experts explain why bridges and overpasses ice over before roads, and how to stay safe

Published on Feb. 24, 2026

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Drivers may encounter unexpected icy conditions when crossing bridges and overpasses, even when the surrounding roads appear dry. This phenomenon occurs because bridges and elevated roadways lose heat faster than regular roads, causing them to freeze first. Knowing what to look for can help drivers avoid dangerous slides and accidents.

Why it matters

Bridges freezing before the rest of the road is a common weather-related hazard that can catch drivers off guard, leading to increased risk of accidents and property damage. Understanding the science behind this issue can help drivers stay safe during cold weather conditions.

The details

Bridges and overpasses freeze first because they are exposed to the elements on both the top and bottom, allowing heat to dissipate more quickly than a regular road that is only exposed on the top. This means bridges can develop ice, frost or black ice even when the surrounding pavement is still clear. Bridges also tend to be the first to freeze because they lack the insulating effect of the ground beneath them.

  • Bridges and overpasses can freeze over even when the surrounding roads appear dry.

The players

Bridges

Elevated roadways that are exposed to the elements on both the top and bottom, causing them to lose heat faster than regular roads and freeze first.

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What’s next

Drivers should be extra cautious when approaching bridges and overpasses during cold weather, reducing speed and increasing following distance to avoid losing control on icy patches.

The takeaway

Knowing that bridges freeze first can help drivers anticipate dangerous conditions and take appropriate safety measures to avoid accidents, especially during the winter months.