Most cars carry one person and are used for less than one hour per day. A more economically rational approach would be to use vehicles more intensively. Carsharing, in which a group of people pay a subscription plus a per-use fee, is one such strategy. Smart carsharing employs advanced technology to facilitate tracking, billing, and system management. CarLink, a smart carsharing system, was deployed in the San Francisco Bay Area for ten months in 1999 to test this concept.