Comment by Arelius

"Rush hour" is actually a pretty long distribution of time compared to the average length of a person's commute. I imagine just considering commuting, you could likely get close to half the amount of cars required with car-sharing, since you may get in at 7:30 and I may get in at 9:00. And you could provide good price incentives to convince people to mix up their commute times a bit. I already know people who push their times significantly to avoid traffic just due to the stress aspect.