Attitude

Thick fog means you cannot see more than about 100 metres ahead. What must you do with your lights?

Use only your side lights to avoid glare
Leave your lights off because it is daytime
Switch on your headlights, as visibility is seriously reduced
Correct
Use full beam to punch through the fog

Why?

Rule 226 of The Highway Code says you MUST use headlights when visibility is seriously reduced, generally when you cannot see for more than 100 metres. Full beam is not used in fog because it reflects back and dazzles you.

Highway Code rule 226

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Thick fog means you cannot see more than about 100 metres ahead. What must you do with your lights?

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