One of the first U-Pass programs in the United States was started at the University of Washington (UW) in conjunction with King County Metro in the Seattle area. This program began in 1991 and now offers students access to most public transportation services in the Puget Sound region. The program was initially introduced as a short-term pilot program, only the largest transit operator in the Seattle area, King County Metro (KCM) and the main UW campus in Seattle were involved. The pilot was so successful that it became permanent; participation is now mandatory for students at all three UW campuses, and six additional transit agencies have joined the program. Students access the bus service by using their university ID card.