Re: "so far caused by human error and inattention"
"Dumb meat-bags doing stuff that another meat-bag would see the warning signals of high stupidity and/or intoxication and keep well away?"
That's always been my concern of mixing meat-bag operated cars with autonomous cars. The robot cars are likely to drive "perfectly", ie to the letter of the law while meat-bag drivers will bend the rules to suit the conditions and operate on the assumption that other drivers will do the same. Once you have a number of "perfect" drivers following the letter of the law no matter what, there's likely to be a few more bumps. Obviously, legally, it will be the meat-bags at fault since they will be the ones bending the rules.