@Lane Anderson posted:Actually it's the opposite. They're only allowed on with low beams. Most (like my BMW) will cut off the driving lights if you turn on high beams.
Or is that fog lights? I can't remember. I always thought driving lights went on with high beams but fog lights were allowed on low beam only.
My truck has clear fog lights that go off with the high beam. Their cutoff pattern is very low, but I've not measured it.
The real gist of it is aux lights need to be mounted BELOW the regular headlights(between 16 and 42 inches above ground) and cannot be above a 42 inch high beam pattern at 75 feet.
The other thing is you are not allowed to blind oncoming drivers which is why they should be hooked to the high beam. There's a car coming, you dip your high beams, and your aux driving lights shut off, NOT blinding the poor shlub coming the other way. But maybe I'm wrong.