I dread the day when the Interstates are full of self driving vehicles.
On Interstates self driving vehicles would potentially cause extreme traffic jams, because they wouldn't exceed the speed limit, would block off the left lane, and wouldn't be intelligent enough to adjust their speed up for a short time (above the speed limit if needed) so they could move over into an open space in the right lane to let faster traffic pass.
Well yeah they probably won't break the law but that would also mean they wouldn't stay in the left lane longer than necessary.
I have to admit, I'm hoping they are affordable by the time I'm too old to drive so I can keep my cranky self here in my rural area and not be carted off to the old folks villages quite so soon.