Theory test – Highway code – Rule 235 – Fog

The Highway Code applies to England, Scotland and Wales and is essential reading for everyone.
Rule 235

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
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.