The projection distance of the fog lamps is short enough that they don't really accomplish anything in any situation in which the high beams are possible/useful. And, on a practical basis, they very often (if not always) feed off of the same fuse, which would blow if they were both on at the same time.
(And if you ARE in heavy fog, highbeams are downright dangerous, because they make it MORE difficult to see things in front of you.)
(And if you ARE in heavy fog, highbeams are downright dangerous, because they make it MORE difficult to see things in front of you.)
