And what about traffic stops? Someone has a license plate light out (lol), who does the ticket go to? And how does the officer even get the car to stop, if - say- the owner/operator is asleep?
Here's another scenario, creepy guy kidnaps a hot 16 year old he met online, duct tapes her up, puts her in the trunk of his driverless Prius (well, hatch...whatever), programs the computer to drive a gajillion miles away, hits start, and hops out of the car....if police locate the car, how are they going to pull it over to rescue the girl?
What if the car has a blowout while the driver is asleep? What if a component fails on the vehicle? Wheel bearing decides it's gonna take a vacation in Shoulderville, and falls the fuck off? What if the owner gets their tires rotated at Sears - even if it's by a guy that went to tire college?
It won't happen.