If self-driving cars come into their own, will they reduce the total amount of vehicles on the road, or will everybody who owns a car now just buy a self-driving one? This study set in Austin says that each self-driving car will displace 9 normal cars. So even if the same or more cars are in motion at any given time, there will be a lot less land required for parking. That land can be used for something else – housing, commerce, habitat, recreation, gardening/farming, or some combination. Bring it on!