Winter Weather
Bridge Icing Weather Guide: Why Overpasses Freeze First
Why bridges and overpasses ice before regular roads, and how drivers can spot freezing risk during winter travel.
Quick answer: Bridges freeze sooner because cold air surrounds them above and below, allowing the road surface to lose heat faster.
Heat loss
Regular roads retain some warmth from the ground beneath them.
Bridge decks are exposed to cold air on all sides, so they can cool below freezing earlier.
Sneaky conditions
A road may seem only wet until the first bridge or shaded overpass.
Light freezing drizzle, fog, or refreeze can create a thin glaze.
Safe habits
Avoid braking hard on bridges, reduce speed before reaching them, and watch for changing pavement shine.
Extra space gives more time if traction drops.