Vehicle handling

You're driving in thick fog and switch on your rear fog lights. When must you switch them off?

Never, as long as it is still cloudy
As soon as visibility improves
Correct
Only when you leave the motorway
After it gets dark

Why?

Fog lights are very bright and can dazzle drivers behind you and hide your brake lights once visibility is no longer poor. Rule 236 of The Highway Code says you must switch off front and rear fog lights as soon as visibility improves, using them only when visibility drops to 100 metres or less.

Highway Code rule 236

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You're driving in thick fog and switch on your rear fog lights. When must you switch them off?

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