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Why should you always reduce your speed when travelling in fog?

A It is more difficult to see events ahead
You won’t be able to see as far ahead in fog as you can on a clear day. You will need to reduce your speed so that, if a hazard looms out of the fog, you have the time and space to take avoiding action. Travelling in fog is hazardous. If you can, try and delay your journey until it has cleared.
B The brakes do not work as well
C You will be dazzled by other headlights
D The engine will take longer to warm up