Drivers have been warned to be extra careful this morning as fog may cause disruption on the roads.

The MET Office has issued a yellow weather warning about the fog, which will remain in place until 9am today.

Warnings of dense fog are issued when visibility is expected to fall below 200 metres. Severe disruption to transport occurs when the visibility falls below 50 metres.

Travelling in fog can be extremely dangerous. Fog can drift rapidly and is often patchy.

The MET Office said: "Dense fog patches have formed overnight with some travel disruption possible this morning.

"Slower journey times with delays to bus and train services possible.

"There is a chance of delays or cancellations to flights."

Travel Dorset said: "Visibility is severely reduced, even at lower levels this morning. Switch on and use all lights appropriately."

Weymouth and Portland Police said: "It’s extremely foggy in places this morning. Please make sure you put your lights ON and adjust your driving to suit the conditions. Dorset police are already in attendance at a number of Road Traffic Collisions this morning."

Advice for road users when travelling in 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.