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Correct!

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

When visibility is reduced to 100 metres (328 feet) or less
Correct answer
When visibility is reduced to 125 metres (408 feet) or less
When visibility is reduced to 150 metres (490 feet) or less
When visibility is reduced to 175 metres (572 feet) or less

DVSA theory test 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.

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