Car fog lights: how and when to use them

Motoring Research team
·3-min read
How to use your fog lights
How to use your fog lights

Driving in winter can be difficult, and fog frequently makes the dark mornings and evenings more dangerous. It is important to know exactly how all your lights work on your car – and when you should use them.

When there is fog, you should have your headlights turned on. However, many modern cars come with automatic headlights, which don’t always respond to foggy conditions. You may therefore need to switch them on manually.

The next consideration is whether to supplement your car’s headlights with fog lights.

What are fog lights for?

How to use your fog lights
How to use your fog lights

It sounds obvious, but bear with us. Rear fog lights are indeed for foggy conditions. But more importantly, they are for other drivers, not you. They don’t help your own vision.

Like your indicators, they are a sign to others that visibility is limited. And, of course, an indication that you are nearby.

When should I switch my fog lights on?

How to use your fog lights
How to use your fog lights

This is where things get hazy (so to speak) and it’s a subject of much debate. Especially as inappropriate use of fog lights is a bugbear for many motorists.

Use the other cars around you as an indication of whether they are necessary. Look at the car 100 yards ahead and judge how well you can see it. If you can see it clearly, fog lights aren’t warranted.

How to use your fog lights
How to use your fog lights

If the car is lost in the haze, with only glimmers of light to be seen, then it’s time to switch your fog lights on.

This is especially important on the motorway, given how fast you and the cars around you are travelling. Truthfully, if conditions are that bad, we’d hope speeds will be below the 70mph limit.

As soon as conditions clear, it’s important to switch your fog lights off.

What if I leave my fog lights on?

Fog lights have a very specific purpose. Using them when they’re not needed can dazzle other drivers, and even obscure other lights on your car. You don’t want your brake lights to be invisible because your rear fogs are outshining them.

It’s a legal issue, too. If the police see you driving with your fog lights unnecessarily, a £50 on-the-spot fine could be issued.

How do I turn my fog lights on?

How to use your fog lights
How to use your fog lights

By law, all cars built since 1986 must have at least one rear fog light. This will be operated using a switch with a symbol similar to those above.

Front fog lights aren’t a legal requirement, but many cars have them fitted as standard. In most cars, they can be switched on using the same stalk as the headlights, or by a button on the dashboard.

The symbol for fog lights can be seen on the rectangular switch in the picture above. If the wavy line is to the left of the lamp graphic, those are your front fog lights. If the wavy line is to the right, this activates your rear fog lights.

You will also see a warning symbol on the dashboard to confirm fog lights are on.

Any other tips for driving in fog?

How to use your fog lights
How to use your fog lights

First of all, it’s usually beneficial not to use your main beam. While it might be tempting to flick it on to give a better view, in thick fog it will cause reflections and reduce visibility even more.

Drive slowly, and leave a bigger gap to other vehicles in case they have to stop suddenly.

When you’re stopped, for example at traffic lights, keep your foot on the brake pedal so your brake lights are lit up, making you more visible to other traffic. When a car stops behind you, though, use your handbrake and remove your foot from the brake pedal to avoid dazzling the other driver.


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