All you need to know about car fog lights, including how and when to switch them on, plus the penalty for using them ...

The advice given to drivers is to "slow down, use your headlights, and leave plenty of distance ahead of you." ...

A yellow fog warning is in force for a swathe of southern ... "Make sure you know how to switch on your fog lights, and check they are working before setting off on your journey." ...

Wales has a warning in place for the same time ... fog can give the illusion of moving in slow motion Use fog lights, but remember to turn them off when the visibility improves Don't hang on ...

A widespread Status Yellow warning for fog has been issued for many parts of the country. Met Éireann said there will be patches of fog and freezing fog, which will thicken during the night.

ISTOCK / GETTY IMAGES PLUS / NWS "In extremely dense fog where visibility is near zero, the best course of action is to first turn on your hazard lights, then simply pull into a safe location such ...