The Board’s ADA Accessibility Guidelines for Transportation Vehicles, which were first published in 1991, address access to buses, vans, rail cars, and other modes of transit.  They serve as the basis for standards maintained by the Department of Transportation (DOT) that apply to new or remanufactured vehicles required to be accessible under the ADA.  In 1998, the Board and DOT jointly supplemented provisions in the guidelines for over-the-road buses.

The Board is updating sections of the guidelines for buses and vans and will follow-up with updates to other sections covering rail cars.

ADA Requirements for Transportation Vehicles


  • September 6, 1991 – Board publishes the original ADAAG for Transportation Vehicles (DOT adopts them as its ADA vehicle standards on the same day)
  • March 25, 1998 – Board and DOT jointly propose additional provisions for over-the-road (OTR) buses
  • September 28, 1998 – Board and DOT issue final rule supplementing provisions in the vehicles guidelines and standards covering OTR buses 
  • April 11, 2007 – Board releases for public comment draft updates to sections of the guidelines covering buses and vans 
  • June 11, 2007 – Comment deadline on draft update
  • November 19, 2008 – Board releases for public comment revised draft of updates to provisions in the guidelines for buses and vans
  • January 20, 2009 – Deadline for comments on the revised draft update
  • July 26, 2010 – Board officially proposes updates to the sections of guidelines on buses and vans
  • November 23, 2010 – Deadline for comments on the proposed rule
  • May 23, 2013 – Board establishes the Rail Vehicles Access Advisory Committee to recommend updates to sections of the guidelines covering rail cars