[throwaway0a5e]

> if the articles I've read on autonomous vehicles is any indication I expect they will drive more cautiously and slowly than most human drivers when they finally "go live" in a widespread fashion

They won't get stuck at left turns, on-ramps and rotarys due to an inability to use the skinny pedal to its full capacity.

That won't solve the sheer numbers problem but it's probably a solid sized constant factors improvement.