Driving In Fog

Driving in fog

Learners section > Driving In Fog

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Driving in fog is one of the most hazardous and potentially dangerous of all driving situations. Without due care and attention being displayed accidents involving a dozen or more cars can easily happen.

However by taking certain precautions these risks when driving in fog, can be kept to a minimum

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Drive to a speed where you can see to be safe.

If visibility is bad reduce your speed.  It is very easy in fog to not see the other cars lights until you are virtually on top of them, by reducing your speed you Increase your reaction time and your stopping ability. Just because you cant see lights ahead doesnt mean there are no other vehicles on the road, remember parked or broken down vehicles will have no lights on.

Also warning signs will be hidden in the fog, making the identification of sharp bends or junctions and sliproads a lot harder to identify..

 Keep looking at your speedometer, fog can cause you to think you are not travelling very fast and speed is the major contributor to accidents in fog

Remember Pedestrians and Bicycles will not be seen easily


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Use dipped headlights and/or Front Foglights.

Depending on the density of the fog to use both is advisable..... However on some occasions using headlights actually decreases visibility, in which case just using front fog lights becomes a better option (this is why front fog lights are now designed to work without the headlights being in use first)

The reason we dont use main beam in fog, as it is refelcted back by the moisture in the fog, and in effect produces a white wall in front of you, that severely impairs your visibility


Rear Fog Lights

High intensity rear fog lights help you to be seen a lot more clearly in fog than with normal lights. You must however remember to turn them off when visibility is more than 100 metres or 328 feet.

If you can clearly see a cars headlights in your rear view mirror at a distance it is not worth using your fog lights, however if they are hidden or hazy, then rear fog lights will be of benefit.

However if you are in an inner city location with much traffic it may be worth turning them off so as to not dazzle the driver in the vehicle behind


Use Windscreen Wipers and Screenwash

Make sure you use your windscreen wipers and screen wash to maintain maximum visibility as you drive as well as having your demister on to keep all windows clear.


Road Position

If fog is quite thick you can use the left hand edge of the road or pavement as a guide, or if on a dual carriageway or motorway keep to the left hand lane and you can use the grass verge or hard shoulder as a relible marker - NEVER use the centre white lines as your guide when driving in fog


If your car breaksdown in the fog do not try and push it out of the way, unless you are on an inner city road and are able to park at the side of the road, it is best just to put the vehicles hazard warning lights on and go and waiti in an area well away from your vehicle.

There is a serious risk that another vehicle may collide with it if you are on a country road or carriageway, so yes you may get wet, you may be cold, but by moving a good distance away from the vehicle you'll still be alive to talk about it!!

Also in those circumstances it would be best to dial 999 and inform the emergency services of the predicament.

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