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You must use your headlights when visibility is seriously reduced. What distance would be classed as seriously reduced?

100 metres (328 feet) or less
Correct answer

DVSA explanation

It's advisable to use headlights when visibility is poor, but they must be used when visibility is seriously reduced. This is generally when you cannot see more than 100 metres (328 feet). Front and rear fog lights may also be used, but you must switch them off again when visibility improves.

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