The 1991 ADA Standards were in effect until March 14, 2011. The 2010 Standards are the current enforceable accessibility standards.
1991 ADA Standards for Accessible
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1991 Standards - PDF
The Department of Justice published the Americans with Disabilities Act of 1990 (ADA) title III regulations, which included the ADA Standards for Accessible Design (1991 Standards), on July 26, 1991.
The Department of Justice published revised regulations for Titles II and III of the ADA in the Federal Register on September 15, 2010. These regulations adopted revised, enforceable accessibility standards called the 2010 ADA Standards for Accessible Design (2010 Standards) and permitted the 1991 Standards to be used until March 14, 2012.
On March 15, 2012, the 2010 Standards became the enforceable standards under Titles II and III for new construction, alterations, program accessibility, and barrier removal. 2010 ADA Standards for Accessible Design
If you have questions about the ADA Standards and want to talk to a Department of Justice ADA Information Specialist, go to the ADA Information Line page for the Department's toll-free telephone numbers and times of operation.