The car doesn't need to orbit. It can go off and park itself somewhere else, and come back as you are about to leave. Think of it as an automated valet. This

The car doesn't need to orbit. It can go off and park itself somewhere else, and come back as you are about to leave. Think of it as an automated valet. This does mean we don't need the huge car parks around places of interest as everyone can be dropped off and picked up at the front door. (And when the car is going to self park, it can use speeds and routes that avoid adding congestion to the people trying to get somewhere.)