[cm2187]

There is another objection. People who use a car to go to work need that car at the same time. Playing lottery on whether I will be allocated a car or not to get to work this morning isn't an option. That's why farmers usually own their hardware. They could rent except that they all need it the same days.

It will free up the streets nevertheless. The reason you park your car nearby is so that you can walk to it. But if the car can go park itself and come back 10-15min from where you live in some big car park, you would probably as happy as if you had to walk 5-10min yourself.

Plus ownership isn't fully rational. Otherwise people wouldn't bury themselves into debt to own their house, pushing property prices up. Instead you would have cheap property you can rent.