49 CFR Parts 37 & 38 - Department of Transportation (DOT) ADA Regulations

(h)

(1) If an area containing a primary function has been altered without providing an accessible path of travel to that area, and subsequent alterations of that area, or a different area on the same path of travel, are undertaken within three years of the original alteration, the total cost of alteration to the primary function areas on that path of travel during the preceding three year period shall be considered in determining whether the cost of making that path of travel is disproportionate;

(2) For the first three years after January 26, 1992, only alterations undertaken between that date and the date of the alteration at issue shall be considered in determining if the cost of providing accessible features is disproportionate to the overall cost of the alteration.

(3) Only alterations undertaken after January 26, 1992, shall be considered in determining if the cost of providing an accessible path of travel is disproportionate to the overall cost of the alteration.