I often see drivers using their fog lights when there is no fog. Please clarify the rules.
G. Chaucer, Canterbury
Front or rear fog lights must not be used unless in fog or other hazardous weather conditions where visibility is reduced. This may include snow, heavy rain or a dust storm. During the day when there is fog or other hazardous weather, headlights may be kept off if the driver is using front fog lights.
Fog lights shouldn’t be confused with driving lights or daytime running lights, which have different uses. Fog lights have a low, flat, wide beam to illuminate the road below the fog or mist. They must be wired to switch on separately to the high-beam and low-beam headlights and may emit a white or yellow light.
Driving lights are designed to illuminate the road over a long distance. They supplement high-beam headlights and have a similar lighting pattern. Driving lights are wired to switch on with the high-beams and must emit a white light.
Daytime running lights on the front of a vehicle increase its visibility to other road users. They generally can’t be controlled by the driver, turning on automatically when the engine is started.
Under the rules, lights must not dazzle other drivers. So at your next service have them checked and, if necessary, re-aimed.
Published in RoyalAuto Jul 2016