Foggy conditions mean drivers face hazardous conditions on the roads as they negotiate their usual journeys but with added difficulty.

Fog can significantly impact on driving as visibility will be reduced significantly, but many motorists fall into a trap of misusing their fog lights when they do not need to.

Here is a guide on how and when you should use your fog lights.

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What should you do before driving in foggy conditions?

  • Always know where your fog light switch is and that it works.

Remember, it is a legal requirement to have a fog light in your car .

What should you do when driving in fog?

  • Check mirrors, then slow down as you approach.
  • Maintain a greater distance between you and the car in front - the gap needs to be four seconds instead of two.
  • Use your wipers to keep your windscreen demisted.
  • If "fog" is shown on a signal but the road is clear, be prepared for sudden patches of fog.
  • Use your fog lights if visibility is reduced to 100 metres (328 feet).
  • Do NOT use full beam lights because fog reflects the light back and reduces your visibility further.
  • Do NOT attempt to navigate using the tail lights of the car in front as this gives a false sense of security.
  • If visibility is very limited, wind down your windows at junctions and crossroads to allow you to listen out for traffic.
  • If you really cannot see, you should consider stopping until it is safe to continue.
Fog in London

When should you use your fog lights?

  • The Highway Code states fog lights should only ever be used in the fog and when visibility drops below 100 metres (328 feet).
  • Failing to use them could impact the safety of yourself, your passengers and others around you on the road.
  • If you are involved in an accident during fog and you failed to use your fog lights it could invalidate your insurance.

Is it ever illegal to drive with your fog lights on?

Yes. It is against the law to use your fog lights when visibility is not reduced as this will dazzle other road users.

Also remember that in freezing conditions black ice could form on the roads which will increase your braking distance by 10 times, so be sure to leave plenty of distance between you and the driver in front on those sub-zero mornings.

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