Visibility of 50m or less can cause severe travel disruption. The Met Office advises drivers to check road conditions before setting off and use fog lights when visibility is seriously reduced.
Allow extra time for your journey and adjust your plans if necessary. Patchy fog can be particularly dangerous because visibility can change suddenly.
The RAC motoring organisation recommends allowing extra stopping distance between your vehicle and the one ahead.
If you’re using public transport or flying, check for updates from your operator and follow its advice. Flights may be delayed because aircraft need greater spacing when landing in fog.