Risk of fog ahead
A red triangle with horizontal lines suggesting fog. Fog reduces visibility severely and changes how you should drive: dipped headlights (or fog lights below 100 metres visibility), drop your speed, and increase the gap to the vehicle in front. Don't follow another car's tail lights — they aren't a guide to where the road is going.
- Diagram reference
- 6011.0
Where you'll see this sign
Low-lying valleys, river crossings, areas near reservoirs, and the M62 over the Pennines.
Test yourself on UK road signs
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