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Why should you always reduce your speed when travelling in fog? Why should you always reduce your speed when travelling in fog?

  • Possible answers:

     
  • A. The brakes don't work as well

  • B. You'll be dazzled by other headlights

  • C. The engine will take longer to warm up

  • D. It's more difficult to see what's ahead

 
 

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Driving in adverse weather conditions: Fog

Rule 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.

Rule 235

When driving in fog you should

Rule 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