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Correct!

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

Switch off your fog lights
Correct answer
Keep your rear fog lights on
Keep your front fog lights on
Leave your fog lights on in case the fog returns

DVSA theory test explanation

Bright fog lights can dazzle other drivers, so you must remember to turn them off when the fog lifts and visibility improves. Be prepared for patchy fog: you may need to turn the fog lights on again.

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