Giant Robotic Parking Garage

Any time we see American cities from above, we are astonished at how much real estate is set aside for cars, both in streets and in parking lots. Sure, we have multi-story parking garages in places, but even they take up a lot of room because there has to be drivable roads to each floor and each space. Tokyo tackled that problem with mechanized garages that store your car in much less space, some of them underground, to boot! Those kinds of garages cost an awful lot to install, and pay off in nebulous benefits over a long period of time, which means they are probably out of the question for the US.