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In fact, most drivers can expect to navigate through fog at least once a year. In cold weather, freezing fog can even lead to the formation of black ice on road surfaces.

The automatic headlights in vehicles detect brightness outside the vehicle with an illuminance sensor, which activates when light picked up by the sensor drops below a certain level. 

While the automatic headlights are convenient, they do not activate in inclement weather such as snow, rain or fog. For your safety and the safety of others, it’s important to manually turn on your headlights in these conditions. 

Be aware that daytime running lights (DRL) on most new vehicles may activate white lights to the front but leave the tail lights off. This can lead to confusion, with many drivers at night or in inclement weather feeling that their headlights are on when there’s no rear lighting. 

When in doubt, remember this simple rule: turn your headlights on! It’s a small action that can make a big difference in your safety on the road.

The best thing to do is to avoid driving in fog. Check weather forecasts, and if there is a fog warning, delay your trip until it clears. If that is not possible or you get caught driving in fog, you should follow several safe driving tips. 

Tips for winter driving in the fog

• If you don’t have to, then don’t drive. If possible, wait for better weather.
• If visibility decreases rapidly, move off the road and into a safe parking area to wait for the fog to lift.
• Turn on your lights when you get behind the wheel.
• Use low beams.
• High beams reflect off the moisture droplets in the fog, making it harder to see.
• If you have fog lights on your vehicle, use them in addition to your low beams.
• Patience is key. Avoid the temptation to pass, change lanes or cross traffic in foggy conditions. By maintaining a steady pace and avoiding sudden manoeuvres, you can significantly reduce the risk of accidents.
• Use pavement markings to help guide you. In foggy conditions, it’s better to use the right edge of the road as a guide rather than the centre line, as it helps you stay in your lane and avoid oncoming traffic, which can be hard to see in fog.