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You're driving with your front fog lights switched on. Earlier fog has now cleared. What should you do? You're driving with your front fog lights switched on. Earlier fog has now cleared. What should you do?

  • Possible answers:

     
  • A. Leave them on if other drivers have their lights on

  • B. Switch them off as long as visibility remains good

  • C. Flash them to warn oncoming traffic that it's foggy

  • D. Drive with them on instead of your headlights

 
 

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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