Multi-car parking areas (garages, e.g.) could be compressed somewhat if humans no longer need to be in the space. (When the car drops you off and then goes and

Multi-car parking areas (garages, e.g.) could be compressed somewhat if humans no longer need to be in the space. (When the car drops you off and then goes and parks itself.) There's space used for fault tolerance, and just opening doors, that would no longer be necessary given a "perfect" driver. I bet you could get another 20% usage spacewise. And there might even be other efficiencies to take advantage of. Even now there are parking garages where cars are stored on top of each other using some kind of mechanical lift.