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

Possible Answers:

a. When visibility is reduced to 100 metres (328 feet) or less

b. When visibility is reduced to 125 metres (408 feet) or less

c. When visibility is reduced to 150 metres (490 feet) or less

d. When visibility is reduced to 175 metres (572 feet) or less

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