Bridges Freeze First, Posing Danger on Roads

Got story updates? Submit your updates here. ›

Drivers may encounter sudden loss of traction when their tires hit a bridge or overpass, as these structures tend to freeze before the surrounding roads. This is due to the unique way bridges and overpasses are constructed, which makes them more susceptible to icing conditions.

Why it matters

Icy bridges and overpasses pose a serious risk to drivers, as the sudden loss of control can lead to accidents. Understanding this phenomenon can help drivers anticipate and navigate these hazardous conditions more safely.

The details

Bridges and overpasses freeze before regular roads because they are exposed to the elements on both the top and bottom surfaces. This allows heat to dissipate more quickly, causing the bridge deck to cool faster than the surrounding pavement. Additionally, the open space beneath bridges and overpasses allows cold air to circulate, further contributing to the faster freezing process.

• Bridges and overpasses can remain icy for days after the surrounding roads have thawed.

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 surfaces.