We could of course say restricted automated cars to High Speed Roads i.e. Motorways, whilst letting the driver control the car when its not on the Motorway.
That's essentially what the new Mercedes coming out this fall can already do which I posted earlier in this conversation. In fact, not only can it operate the car, stay in its lane and using radar pace the car from the one ahead on a freeway it also can drive itself in a traffic jam - breaking the car from the one ahead.
You just need $92,000 to get one today.