Guide to the ADA Standards

DOT’s ADA Regulations

DOT’s ADA regulations implement the transportation and related provisions of titles II and III of the ADA. They apply to any public entity that provides public transportation or intercity or commuter rail transportation, as well as to any private entity that provides public transportation or that is not primarily engaged in the business of transporting people but operates a demand responsive or fixed route system. They cover both vehicles and facilities and include nondiscrimination requirements associated with the provision of transportation services.

DOT Regulation for Transportation Services 
49 CFR Part 37 
Available at http://www.fta.dot.gov/civilrights/12325.html