Dense fog

Make sure you know what to do

During fog

• Avoid travel if possible.
• Drive very slowly with dipped headlights, full-beam lights reflect off the fog causing a 'white wall' effect.
• Keep an eye on your speed, fog can give the illusion of moving in slow motion.
• Use fog lights, but remember to turn them off when the visibility improves.
• Don't hang on the tail lights of the car in front, rear lights can give a false sense of security.
• Watch out for freezing fog which is made of water droplets that freeze on contact with objects such as the pavement, road, car, etc. It can quickly form a layer of ice. Advice for when conditions are icy.

Travel advice produced in association the Highways Agency