If cars are driverless, I'm not sure why people in cities will want to own cars and not just use driverless public transit. Cities could ban private cars and ha

If cars are driverless, I'm not sure why people in cities will want to own cars and not just use driverless public transit. Cities could ban private cars and have plenty of road capacity to ensure there is as much availability as people want (especially with the help of intelligent routing). The vehicles could be bus-sized, car sized, and in-between. You just step outside and flag down the nearest one, or summon it via the Internet, and go. There are many possible flaws, of course. Could everyone afford it? Supply likely would adjust to demand, and availability would dwindle to barely what is needed. New urban areas would build roads to accommodate the new capacity needs, eliminating the benefits of excess capacity. etc.