Safety margins

You are driving in thick fog. Why should you keep well back from the vehicle in front?

Its rear lights can give a false sense of security
Correct
So the driver ahead cannot see you
Because fog shortens your stopping distance
So you can overtake it more easily

Why?

Rule 235 of The Highway Code warns that in fog the rear lights of the vehicle ahead can give a false sense of security. Keep a safe distance so you can pull up well within the distance you can see clearly.

Highway Code rule 235

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You are driving in thick fog. Why should you keep well back from the vehicle in front?

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