Stupid is as stupid does
I've yet to divine any real advantage in the lighting protocol. Specifically, the ability to fire up either the left or right side parking lights, independent of each other. I see the theory, but no real practical aspect. Which is OKc I just ignore it.
Except, turning the switch too far to the left turns them on. Once, I happened to glance back and notice the left side lights were on. No problem. The other night I didn't notice when that happenedc and I woke up to a dead battery.
A german friend of mine told me that I "must pay attention, that's what a good driver does." Whatever.