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Question:

Using rear fog lights on a clear dry night will

A make your brake lights difficult to notice
Explaination

You shouldn’t use rear fog lights unless visibility is seriously reduced. If you forget to turn them off when the weather improves they can
+ be confused with brake lamps
+ dazzle following drivers.
A warning light will show on the dashboard to indicate when your rear fog lights are on. You should know the meaning of all the lights on your dashboard and check them before you move off and as you drive.