Bridges Freeze First: What Drivers Need to Know

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Bridges and overpasses are prone to freezing before the surrounding roads, creating dangerous driving conditions that can last for days. This is due to the unique way bridges are constructed, allowing them to lose heat more quickly than regular pavement. Drivers need to be extra cautious when approaching bridges, watching for signs of ice and slippery conditions.

Why it matters

Bridges freezing before roads is a common phenomenon that can catch drivers off guard, leading to serious accidents. Understanding why this happens and what to look for can help drivers navigate these hazardous conditions more safely.

The details

Bridges are essentially suspended in the air, with cold air circulating both above and below the structure. This allows bridges to lose heat more rapidly than the surrounding ground-level roads, causing them to freeze first. Additionally, bridges lack the insulating effects of the ground, making them more susceptible to dropping temperatures. Even after the roads have thawed, bridges can remain icy for days, creating treacherous driving conditions.

• Bridges and overpasses often freeze before the surrounding roads, especially during overnight hours when temperatures drop.

What’s next

Drivers should slow down and exercise extra caution when approaching bridges, watching for any signs of ice or slippery conditions. It's also a good idea to check weather reports and road conditions before setting out on a trip.