Realistically, I don’t see how anyone could EVER pass a law saying humans can’t drive where other cars can. Americans (I’m one!) seem far too independently minded, in the sense of wanting to be in control themselves.

Even if you could get 90% on board, the other 10% will fight to the death over it.

Which means the benefits of a 100% automated system (which I disagree with BTW), can’t be reached except possibly after a VERY long time when enough anti-robos have changed their minds/died out.