They are called that way because they first became popular on the first gens, because they passed everything in sight and it was best to have lots of light on the scoot so those whose were being passed had enough time to notice what had taken place. Later they were used on the 2nd gen and then became known as driving lights, for reasons that should be self explainatory. At least that's what I heard and I got it right from the internets mouth so to speak.