Concord, NH – As winter weather grips the Granite State, drivers across Concord, Manchester, and Nashua are being reminded that bridges and overpasses can freeze faster than standard roadways — creating hidden ice hazards during morning and evening commutes.
According to the National Weather Service (NWS), bridges freeze first because they are surrounded by cold air on all sides, unlike ground-level roads that retain warmth from the earth. This makes bridge surfaces cool down rapidly when temperatures fall, even if the main road remains wet but unfrozen.
“Once the air dips below freezing, moisture on bridges can turn to ice in minutes,” the NWS warned in a safety bulletin Thursday. “Snow and freezing rain can make conditions even worse, especially overnight.”
Freezing is often uneven — shaded bridge sections can ice over while sun-exposed areas stay clear, creating unpredictable traction. Motorists are advised to reduce speed before reaching a bridge and avoid braking or accelerating abruptly while crossing.
State crews are currently monitoring key routes including I-93, Route 3, and Route 101, applying de-icing treatments ahead of another cold front expected this weekend.
Officials urge drivers to allow extra travel time and check road condition updates from New Hampshire DOT and 511NH.gov before heading out, especially during freezing mornings.
