"Cars can go off and park somewhere further away. Cruising around the city isn't free (fuel, maintenance, risk of damage)" They can, but then they are farther

"Cars can go off and park somewhere further away. Cruising around the city isn't free (fuel, maintenance, risk of damage)" They can, but then they are farther away when someone calls for a ride. If there's only a few self-driving car rental companies, then maybe it's not so bad, they can send most cars to a remote lot, with a few cars remaining in the city to address demand. But if hundreds of companies are going to have cars on the street, then they'll all want their cars to be crusing near potential riders. Though a bigger problem is that self-driving cars will cause double the traffic of normally driven cars -- they'll drive into the city to drop off their passenger, then out of the city to a remote lot.