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What should you do when driving in fog?

A Allow more time for your journey.

Don’t venture out if your journey is not necessary. If you have to travel and someone is expecting you at the other end, let them know that you’ll be taking longer than usual for your journey. This will stop them worrying if you don’t turn up on time and will also take the pressure off you, so you don’t feel you have to rush.

Related Information

Driving in adverse weather conditions (226 to 237)

5. Fog (234 to 236)


Before entering fog check your mirrors then slow down. If ‘Fog’ is shown on a sign but the road is clear, be prepared for a bank of fog or drifting patchy fog ahead. Even if it seems to be clearing, you can suddenly find yourself in thick fog.


When driving in fog you should

- use your lights as required (see Rule 226)

- keep a safe distance behind the vehicle in front. Rear lights can give a false sense of security

- be able to pull up well within the distance you can see clearly. This is particularly important on motorways and dual carriageways, as vehicles are travelling faster

- use your windscreen wipers and demisters

- beware of other drivers not using headlights

- not accelerate to get away from a vehicle which is too close behind you

- check your mirrors before you slow down. Then use your brakes so that your brake lights warn drivers behind you that you are slowing down

- stop in the correct position at a junction with limited visibility and listen for traffic. When you are sure it is safe to emerge, do so positively and do not hesitate in a position that puts you directly in the path of approaching vehicles.


You MUST NOT use front or rear fog lights unless visibility is seriously reduced (see Rule 226) as they dazzle other road users and can obscure your brake lights. You MUST switch them off when visibility improves.

Law RVLR regs 25 & 27

[The Highway Code]



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