[greg_bt]

This idea already exists as car sharing schemes, it is incredibly handy. Self Driving cars will only improve car share schemes.

See the following sites for examples of car share schemes.

http://www.modo.coop/

http://www.zipcar.com/

[stephengillie]

What if you join Zipcar to Ridejoy to Uber to autonomous cars? Half taxi, half bus, totally convenient.