The worst affected areas include the north west of Edinburgh, the Queensferry Crossing and Forth Road Bridge.
Here are RAC’s top tips for driving in thick fog.
- Before entering fog, you should check your mirrors, then slow down.
- Maintain a greater distance between you and the car in front, you could increase the gap to four seconds from the recommended two
- Make sure to use your wipers and to keep your windscreen demisted to aid visibility
- If the word ‘fog’ is shown on a signal, but the road is clear, be prepared for a sudden bank of fog or drifting, patchy fog
- Use your lights if visibility is reduced to 100 metres (328 feet) or roughly the length of a football pitch
- Make sure you know where your fog-light switch is before you set off
- Do not use full beam, because the fog reflects the light back, reducing visibility even further
- Do not attempt to navigate using the tail lights of the car in front, as these can give a false sense of security
- If visibility is very limited, wind down your windows at junctions and crossroads to allow you to listen out for approaching traffic
- If you really cannot see, you should consider stopping until it is safe to continue.
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