Safety margins

In fog, how fast should you drive in relation to how far you can see?

Fast enough to keep up with traffic
At the normal speed limit for the road
Slowly enough to stop within the distance you can see clearly
Correct
As fast as the vehicle in front is going

Why?

Rule 235 of The Highway Code says you should be able to pull up well within the distance you can see to be clear. In fog that means slowing right down, because you can only see a short distance ahead.

Highway Code rule 235

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