The road ahead may look clear, but that doesn’t mean it is - particularly in very heavy fog. It goes without saying that if you keep your speed down, you'll have more time to react if a hazard suddenly appears. Leave plenty of space between you and the vehicle in frontīeing able to see rear lights on the vehicle in front of you can give a false sense of security: keep a safe distance so you have enough time to stop if you need to. You can prevent this by turning on your heating system and, if you have them, rear and/or front heated windscreens. Hence, why it is dangerous to leave fog lights onĬondensation can build up quickly in cold or foggy conditions. When there is good visibility, both front and rear fog lights also cause unnecessary glare that can annoy other road users and dazzle them. So why is it dangerous to leave your fog lights on in good visibility? Having rear fog lights in good weather conditions can obscure your brake lights and prevent drivers behind you from realizing you are braking. What happens if you use rear fog lights in good conditions? Due to their lower mounting on the front of the car, fog lights can penetrate mist, fog, rain and even dust. When adverse weather conditions make it difficult for drivers to see the road ahead, fog lights help improve visibility. You should only use front and/or rear fog lamps when visibility is under 100m, and you should turn them off as soon as visibility improves - since they could dazzle other road users. Front fog lamps are indicated with a green lamp-shaped symbol featuring sloping straight lines and a wavy line. These will only work if your main headlights are also on. Learn how to turn on your rear fog lights, indicated with an orange, lamp-shaped symbol. Only use fog lights when visibility is under 100m (328ft) If you see this, turn off your full beams. You'll know your full beams are on if you see a small blue headlight icon on your dashboard. Full beam should be avoided since the light can reflect off the fog and make visibility worse. Your vehicle may have automatic headlamps: make sure they are on, consider overriding them in favour of manual control. Ensure they are set to dipped beam which will help you see more on the road - and help other road users see you. This is the simplest way to avoid the hazards of driving in fog.Įnsure your headlights are working properlyĬheck both front and rear lights are working properly on both sides. If heavy fog is present or is forecast in your area, consider postponing your journey until conditions improve. If you have front or rear fog lights you should only use them in poor visibility - and turn them off as soon as conditions improve. If you cannot see further than 100m (328 feet), visibility is considered poor. If visibility is seriously reduced, you are required to use your headlights. There are specific rules for driving in fog in the UK - and governing the use of fog lights. Driving in fog self-evidently makes it much harder to see road users and other hazards.
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