DOT’s current ADA standards are based on the updated ADA Accessibility Guidelines (2004), which the Board issued jointly with the ABA Accessibility Guidelines for federally funded facilities.  The updated ADA and ABA guidelines, which were proposed for public comment in 1999, are based on recommendations from the Board’s ADAAG Review Advisory Committee.  This committee reviewed ADAAG in its entirety and recommended updates to the Board.  It consisted of 22 members representing the design and construction industry, the building code community, state and local government entities, and people with disabilities.

The previous edition of DOTs standard was based on the original ADAAG as issued by the Board for transportation facilities in 1991.


DOT's ADA Standards and the Updated ADA-ABA Accessibility Guidelines


Original ADA Accessibility Guidelines (ADAAG)

  • ADAAG (1991), basis for DOT's original ADA Standards



  • September 6, 1991 - Board publishes the original ADAAG for Transportation Facilities (DOT adopts them as its ADA Standards on the same day)
  • November 16, 1999 - Board proposes updated ADA and ABA Accessibility Guidelines for public comment
  • May 15, 2000 - Deadline for public comments on the proposed rule; over 2,500 comments received
  • July 23, 2004 - Board publishes the updated ADA-ABA guidelines as final rule
  • October 30, 2006 - DOT adopts new ADA standards for transportation facilities based on the updated ADA guidelines (effective November 29, 2006)