Correct answer
Yes, to have more space to react if the vehicle in front brakes.
Yes, increase separation and reduce speed so you can stop within the visible distance. Fog reduces visibility, but alone does not always increase braking distance at the same speed and grip. If the road is also damp or slippery, account for reduced grip.
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Distance has no effect on stopping when there is fog.
No, if the lights are switched on.
Yes, to have more space to react if the vehicle in front brakes.
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