Every Tesla owner I know admits to using the self-driving feature much or all of the time. It might be interesting to look into the overall accident rate of Tesla owners vs a matched cohort of owners of cars with no autonomous features. Also, is there any goal of having self-driving cars "talk" to each other on the road? In my mind, that solves all the "traffic jam" and "pollution" concerns in this thread, and might make driving I-5 bearable between SF and LA.