Bridge May Ice in Cold Weather Sign — Meaning

By DMV Master Editorial Team Updated April 28, 2026 Also: Bridge Ices Before Road

Category: Warning
Shape: Diamond
Colors: Yellow, Black
Text: BRIDGE MAY ICE IN COLD WEATHER
MUTCD Code: W8-13

What does the Bridge May Ice in Cold Weather Sign mean?

A yellow diamond warning that bridges and overpasses freeze before regular roadways during cold weather. Bridges have no ground heat below them, so they cool faster and form ice when air temperatures approach freezing — even when the surrounding road is dry.

What to do when you see this sign

1
In cold weather (below 35°F), reduce speed approaching all bridges
2
Watch for "black ice" — invisible glaze on the bridge surface
3
Do not brake or accelerate while on the bridge
4
Maintain steady speed and gentle steering
5
Increase following distance — stopping on ice takes much longer

Where you'll see it

On highways with elevated bridges and overpasses
In northern climates (especially common in WI, MN, ND, NE)
On long highway viaducts
At freeway-to-freeway interchange ramps

Test trap: don't get caught by this

Bridges can ice up to 3 hours BEFORE the surrounding road and remain icy AFTER the road has thawed. Always treat bridges as suspect when temperatures are anywhere near freezing.

Frequently asked questions

Why do bridges ice before roads?

Roads are insulated by ground heat. Bridges have no insulation below — cold air circulates around the deck, causing it to cool faster and form ice at temperatures where the road remains liquid.

How do I drive on an icy bridge?

Approach at lower speed. Maintain steady speed across — do not brake, accelerate, or steer abruptly. If you do start to skid, ease off the accelerator and steer gently in the direction of the skid.

Can I tell if a bridge is icy by looking?

Black ice is nearly invisible. If temperatures are below 35°F and the bridge looks wet, treat it as ice. The surface may also appear slightly darker or shinier than usual.