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

(f)

(1) When the cost of alterations necessary to make a path of travel to the altered area fully accessible is disproportionate to the cost of the overall alteration, then such areas shall be made accessible to the maximum extent without resulting in disproportionate costs;

(2) In this situation, the public entity should give priority to accessible elements that will provide the greatest access, in the following order:

(i) An accessible entrance;

(ii) An accessible route to the altered area;

(iii) At least one accessible restroom for each sex or a single unisex restroom (where there are one or more restrooms);

(iv) Accessible telephones;

(v) Accessible drinking fountains;

(vi) When possible, other accessible elements (e.g., parking, storage, alarms).