20 Years of Federal Mass Transit Assistance: How Has Mass Transit Changed?

GAO reviewed the trends and general effects of the substantial federal investment in urban mass transit, focusing on: (1) changes in transit service, using measures such as the amount of service provided, the cost of service, and the quality of service; (2) changes in ridership levels; and (3) the extent to which improved transit service has contributed to the broad social, economic, and environmental benefits generally associated with such improvements.