I think human driver overcompensating for braking ahead, and human reaction time creating traffic "waves" contributes significantly to traffic. (At least that'

I think human driver overcompensating for braking ahead, and human reaction time creating traffic "waves" contributes significantly to traffic. (At least that's what I've heard). Also self driving cars wouldn't need as much distance between cars to be able to stop safely so you could physically fit more cars on a given stretch of road.