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Why is it dangerous to leave rear fog lights on when they're not needed? Why is it dangerous to leave rear fog lights on when they're not needed?

  • Possible answers:

     
  • A. They may be confused with brake lights

  • B. The bulbs would fail

  • C. Electrical systems could be overloaded

  • D. Direction indicators may not work properly

 
 

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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