You're driving in fog that's starting to clear. When should you switch off your high-intensity rear fog lights?

Possible Answers:

a. When visibility is more than 10 metres (32 feet)

b. When visibility is more than 50 metres (164 feet)

c. When visibility is more than 75 metres (246 feet)

d. When visibility is more than 100 metres (328 feet)

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