It would really help eliminate the stupid and the selfish.
I once got illegally passed in a narrow canyon and right after the guy passed me he missed seeing the chunk of tree that was sticking out into the road. It ran all the way down the side of his truck. I still chuckle about that years later.
But living in Boston, I regularly see idiots who can't obey traffic signs or get into the correct lane and they rarely have to suffer for it.