On March 15, the U.S. Department of Justice's updated ADA 2010 Standards became mandatory for new construction and alterations covered by the Americans with Disabilities Act. Optional use of the original 1991 standards is no longer allowed. For state and local government facilities, compliance with the 2010 standards is required where the physical start of construction or alteration occurs on or after March 15, 2012. Public transportation facilities are subject to ADA standards issued by the DOT in 2006. www.ada.gov