I'd expect a situation to arise where cars are allowed to go into automatic driving mode on motorways/freeways but not in cities. Gradually more and more roads

I'd expect a situation to arise where cars are allowed to go into automatic driving mode on motorways/freeways but not in cities. Gradually more and more roads would become available for automatic driving as more and more cars get the automatic driving capability. I don't think people will ever be ready for an instant complete switch over. I'd expect it to be a gradual switchover which takes years.