[netfire]

Car sharing (if self-driven) does provide an additional perk--time and money saved trying to find a place to park and paying for that parking. In addition, people turning into parking lots/garages (or worse parallel parking) interrupt the flow of traffic, making congestion worse. There's also many other potential improvements that self-driving cars could use to reduce congestion (faster speeds, reaction times, communication between cars, etc) and greatly lessen the commute during peak times