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Incorrect!

You're driving in fog. When should you switch on your rear fog lights?

When visibility has fallen to your overall stopping distance
You selected this answer
When visibility has fallen to 10 car lengths
When visibility has fallen to 100 metres (328 feet) or less
Correct answer
When visibility has fallen to 200 metres (656 feet) or less

DVSA theory test explanation

If visibility falls below 100 metres in fog, switching on your rear fog lights will help road users behind to see you. Don't forget to turn them off once visibility improves: they're very bright, so they might be mistaken for brake lights and they could dazzle other drivers.

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