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

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 can't 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.

Category: Band 3 driving test

References: The Official DVSA Guide to Driving: Section 12, Highway Code: Rule 226