You’re driving in fog. When should high-intensity rear fog lights be used?

Explanation: High-intensity rear fog lights are far brighter than normal rear lights. When visibility is reduced to 100 metres (328 feet) or less, they should be used to help drivers behind to see your vehicle. When visibility improves, these high-intensity lights should be switched off to avoid dazzling drivers behind.

Category: Band 3 driving test

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