I'm so confused by this. Instead of one person driving a car to the store and parking, now the car is driving itself to the store with one person in it, dropping them off, and then either parking, or driving itself around more, back to the house or to a distant parking facility. In crowded cities, the car is just going to drive around the block empty for an hour instead of paying $12 for parking. Single-occupancy vehicles are a big problem now; I don't understand how introducing a bunch of zero-occupancy vehicles are an improvement on that? It seems very obvious to me self-driving cars are going to significantly increase the total number of miles driven every day in the world.