Rear fog lights

Lots of drivers put on their rear fog lights as soon as it starts to rain or when it gets is little misty. While I've no doubt that they do this with good intention it can cause more harm than good.

High intensity rear fog lamps are designed for thick fog, typically 80 metres or less visibility.

Using rear fog lights when visibility is greater than this can mask your brake lights and dazzle other drivers, thus increasing the risk of a rear-end collision rather than reducing it.

Constant, dazzling bright lights can also add to fatigue at night.

Think of rear fog lamps as signals.

switch on your rear fog lamps when there is no one close behind - but switch them off as soon as they have done their job and the driver behind can see your regular tail lamps. For example, if you are in a slow moving queue of traffic in fog, the driver 5 metres behind doesn't need your fog lights!