Re: Not a local issue
The U.S. Constitution actually limits Federal power to specific things, and everything ELSE is in the hands of the states.
Interstate commerce, if involved, justifies federal action. So if a car is legal to purchase in one state, it should be legal to purchase in another. [This should eventually KILL *ALL* state bans on certain kinds of vehicles].
So a self-driving car may need some minimal federal safety standards, and a state may (possibly) extend that WITHIN REASON. but an outright ban or federal overreach SHOULD fail.
This is sort of how things have been for a while. Requiring seat belts, safety glass, advanced anti-skid and braking systems, along with minimal air pollution control devices and standards [Some states go far and above the federal standards] has been established through decades of precedent.
Not simple, but "business as usual" is likely to continue with self-driving cars.