I think the problem was that the rear fogs were being mistaken for brake lights. I had a Volvo that only 1 side rear fog was activated. I took it to the dealer and was informed that was done on purpose to avoid drivers thinking you were braking.
I have them activated on my '12 F10 535i and they are great to use in the heavy downpours here in Florida. Of course, you can always use your flashers. Many do.
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