THE HIGHWAY CODE
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Driving in adverse weather conditions (226 to 237)

  1. Overview (226)
  2. Wet weather (227)
  3. Icy and snowy weather (228 to 231)
4. Windy weather (232 to 233)
5. Fog (234 to 236)
6. Hot weather (237)

5. Fog (234 to 236)

234
Before entering fog check your mirrors then slow down. If the word ‘Fog’ is shown on a roadside signal 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.

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
  • 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.

236
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


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Crown Copyright. The content have been sourced from the 2021 edition of The Official Highway Code, and reproduced under the terms of the Open Government Licence.
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