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Or fewer. The only time I ever see them on is when it's a clear night and I'm getting blinded by the person in front of me. That said, they are pretty useful for more than fog... They're good for flashing at people behind you who don't have their headlights on.

...a rear fog light is an additional parking light on the rear driver side of your car to help other cars identify the width of your car in foggy or other incline to weather situations. They are not brighter than any other light that would regularly be present on that car. If it is brighter and blinding as you say, rest assured the car has been illegally modified and is subject to constant harassment by police in all other jurisdictions!

In the all cars I've owned, rear fog light is brighter than regular rear lights. Not sure if they are brighter than braking lights, but brighter than "position" lights for sure.

https://content.icarcdn.com/styles/article_cover/s3/field/ar... http://www.waycoolinc.com/graphics/z3/03/052503/jt/P5250326....

I've owned three cars with rear fog lights and all of them came from the factory with the rear fog light(s) being brighter than the rear parking lights. That makes sense too -- because if rear parking lights were bright enough for fog then you wouldn't need rear fog lights.

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