Properly designed and aimed fog lamps and low beams will produce no glare to oncomming trafic on a level road. Many cars have improper xennon conversions and cheap fogs that throw light everywhere.
High beams and driving lamps will produce glare because of their design and are not supposed to be used with oncomming traffic.
I have Hella H4 Ecode lights with 150watt bulbs on my old pickup. On the low beams they have a sharp cutoff and no glare. All that you see are 2 white squares on the front of the truck. The high beams wil let you see about a mile down the road and are great for flashing at those blinding lights comming at me. These H4's are a 40 year old design that is about 10x brighter and still far superior to any DOT(US) code light.
Fog lamps should also have a sharp cutoff and should not have any upward light. Some good ones are the NB projector fogs, Hella MicroDE, Hella MicroDE HID, Hella MicroFF, Hella 550F, any fogs from Cibe and Marchal(not available in the US).
Most OEM fogs, especially on american cars are olny there for looks and produce a poor beam with lots of glare.
Here's a pic of the output from a Hela MicroDE Fog. this will not bother any opposing traffic if it is aimed properly.
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