Best two out of three: Education and attitude. We have about all the regulation we can stand now, if we get much more we're going to have to admit to the rest of the world that we're really NOT the land of the free.
Education, so people know what they're doing and why. Attitude, because even the most educated and regulated driver is a total jerk unless he has a good attitude. Road ragers may have the best education, but that anger issue ruins everything.