A basic form of low-speed self-driving would be automated valet parking. Drop people off or pick them up at the entrance, then go park far away. If there was a

A basic form of low-speed self-driving would be automated valet parking. Drop people off or pick them up at the entrance, then go park far away. If there was a common communication standard, the vehicles could also park much more tightly than is done in a normal parking lot. You don't need to keep empty space behind each car when you can coordinate the parked cars to move and clear a path. My guess is that you could park almost twice as many cars in the same space. The combination of reducing parking lot size and freeing people from walking to/from the lot would open up many interesting options for increasing density and walkability in commercial areas.