SEE and be SEEN SEE and be SEEN - Transport Canada USE OF FOG LIGHTS Driving in fog, even for the experienced motorist can be a frightening experience. Given the dangerous circumstances of driving in fog, it’s important to keep as safe as is possible and this can be achieved by using fog lights. ARE FOG LIGHTS A LEGAL REQUIREMENT? In the UK it is a legal requirement to have at least one rear fog light which must be located on the vehicle centre line or to the off-side (the driver’s side). All cars built for the European market come fitted with at least the minimum legal fog light requirements. Front fog lights are optional and there is no legal obligation to have them fitted. More expensive makes and models of cars may have them fitted. WHEN TO USE FOG LIGHTS Motorists are often unsure when exactly fog lights should and shouldn’t be used. Although it is a legal requirement to have fog lights fitted, there is no legal obligation to actually use them, even when it’s foggy. Fog lights should be illuminated when visibility is around 100 metres or less Using them in foggy conditions will of course increase safety. If your vehicle has rear fog lights only, it will increase your visibility for other motorists when turned on.