In just four years, 30 U.S. cities have launched bike-sharing programs, and many others have plans in the works. Bike sharing allows users to rent bicycles from kiosks placed throughout a city and return them at any kiosk location. More than 40 percent of users reported reducing their number of car trips after joining a bike share, and bike shops report an increase in bike sales to those inspired to purchase their own bike after using a bike share.
To learn more: http://thinkprogress.org/climate/2012/08/19/708941/us-hits-30-bike-shares-in-just-four-years/?mobile=nc