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You have been driving in thick fog which has now cleared. You must switch OFF your rear fog lights because

A they make your brake lights less clear
It is essential that the traffic behind is given a clear warning when you brake. In good visibility, your rear fog lights can make it hard for others to see your brake lights. Make sure you switch off your fog lights when the visibility improves.
B they use a lot of power from the battery
C they will cause dazzle in your rear view mirrors
D they may not be properly adjusted