Fog lights should only be used in fog, hen visibility drops below 100 metres (328 feet) which is roughly the length of a football pitch - this is stated by the Highway Code.
Make sure to only use your fog lights when appropriate - if your car is involved in an accident and you weren't using your fog lights, it could invalidate your insurance.
Use your common sense. If the fog is so severe that you’re struggling to see other vehicles, switch on your fog lights.
But don’t keep switching them off and on again, as this can confuse other drivers.
Rear fog lights are considered the most important - you should only use your front fog lights in severely restricted conditions.
Under the Road Vehicles Lighting Regulations 1989, it is prohibited to use front or rear fog lights to dazzle other drivers when visibility is not reduced or when the vehicle is parked.
You should never use your fog lights in rain or drizzle, and could be fined by the police if caught.
All cars are fitted with rear fog lights by law, and many in the UK have both front and back fog lights.
The symbol for fog lights is shown in the photographs above.
The one showing a lamp pointing to the left and with lines pointing diagonally down through the vertical wavy line is for your front fog lights.
The one pointing in the opposite direction, with lines pointing horizontally straight through the wavy line is for your rear fog lights.
They can usually be found on a button on the dashboard, on a steering wheel stalk, or next to the dial you use to control your regular lights.
There will be a symbol on your car’s dashboard or on the fog light button itself: it’s normally an amber indicator for rear fog lights and a green one for front fog lights.
If your car is fitted with automatic lights activated by low light levels, remember to check the lights are on, as they may not be automatically activated in foggy conditions.
If you can't track them down or work out how to turn them on, have a look in your car's logbook.
