Safety margins

You are about to drive through a road tunnel. What should you do?

Use full-beam headlights and speed up
Switch on dipped headlights and keep a safe distance
Correct
Turn off all your lights to avoid dazzle
Put on your hazard warning lights

Why?

Rule 126 of The Highway Code advises using dipped headlights in a tunnel and keeping a safe distance from the vehicle in front, as visibility can be reduced. Follow any signs and, in a queue, leave room to pull up safely.

Highway Code rule 126

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