When will car sharing catch on?

Car sharing is a system of short term rental that gives you occasional access to a car without the
expense and hassle of owning a vehicle full time.  Globally it operates in more than 500 cities.  When
cars drive themselves, car sharing will be more convenient than ever.  This is because new cell phones
have a GPS system in them and your location will be transmitted to a car dispatcher which will then send
a self-driven car to your location.


http://www.grist.org/advice/ask/2005/02/22/umbra-hybrid/

http://www.abc.net.au/rn/science/earth/stories/s1239114.htm

http://www.drivers.com/article/251/