Halloween Fog to Blanket England & Wales

Fog is expected to form across parts of England and Wales this Halloween weekend, posing potential risks to drivers. This phenomenon, essentially a cloud at ground level, occurs when moist air cools sufficiently for water vapour to condense into tiny suspended droplets.

The primary difference between fog and mist lies in visibility. Meteorologists classify conditions as fog when visibility drops below 1,000 metres, while mist allows for visibility of at least that distance. The Met Office often defines fog in forecasts as visibility under 180 metres, with dense fog reducing it to below 100 metres.

Driving in foggy conditions requires specific precautions. The Highway Code recommends using headlights when visibility is seriously reduced, typically below 100 metres. Drivers should also slow down, maintain a greater distance between vehicles, and be prepared to stop within the visible range. Using fog lights is permitted but should be switched off once visibility improves. Full beam headlights are not advised as they can worsen visibility.