The fundamental difference between human and automated drivers is that humans aren't going to get any better. Software based systems will get to human level then continue to improve to the limits of computing and physics, which is certainly better than humans.

And we haven't even considered networking. When the cars are all talking to each and routed together then it's fundamentally a single machine.

The laws and systems will evolve with capabilities rather than getting stuck on supporting the earliest generation of self driving vehicles and norms.