I see lots of self-driving car advocates talk about this "on-demand car" model, but I don't see any way it works in practice. No actual sharing: At rush hour,

I see lots of self-driving car advocates talk about this "on-demand car" model, but I don't see any way it works in practice. No actual sharing: At rush hour, I and most of the people around me will need a car to get to/from work. Therefore the rental fleet will have to be large enough to meet this peak demand, and effectively there will have to be a car in the fleet allocated to me (to get me to and from work). So (amortized over time) I will have to compensate the company for the cost of the car, plus the cost of bringing it to me every day, plus overhead, plus profit. Reduced convenience: A car may not be available immediately when I need/want it. I have to either risk not having a car for some important event or plan in advance and book what I need. The car I'm allocated on any given day may be too small to meet my needs. I have to wait for the car to arrive, can't store my stuff in it, have to take time to install/uninstall car seats, get charged a fee if I leave my empty soda can in it. IMO, for a regular car user (i.e. someone who currently uses a car for multiple trips per day) moving to an on-demand model will be at least as expensive as and less convenient than owning a car. There might be exceptions in very dense urban environments where parking is very expensive, but those places usually have a good public transit alternative.