The Zipcar option in San Francisco
San Francisco has some unique options for those residing in the city for short or long durations. Zipcar is one and City CarShare is another.
Zipcar is ideal for those who don't want to invest in buying a car and generally make use of public transportation. Such people might need cars at times either to get a job done or take someone out, etc.
City CarShare also works the same way. You join and receive an electronic key. When required you call and reserve a car in the area of your choice. You make use of the car and return it back to the same spot.
http://www.zipcar.com/is-it/
http://www.citycarshare.org/
