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You’ve just driven out of fog. What must you do now that visibility has improved?

Switch off your fog lights
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Keep your rear fog lights switched on

Keep your front fog lights switched on

Leave your fog lights switched on in case the fog returns

You must turn off your fog lights if visibility is more than 100 metres (328 feet). Be prepared for the fact that the fog may be patchy and you may need to turn them on again if the fog returns.