36 CFR Parts 1190 and 1191 ADA and ABA Accessibility Guidelines - Preamble (Discussion of Comments and Changes)

In the final rule, the Board has clarified how parking spaces and access aisles are to be measured.

Where parking spaces are marked with lines, the width of parking spaces and access aisles is to be measured from the centerline of the markings (502.1). However, at spaces or access aisles not adjacent to another parking space or access aisle, width measurements are permitted to include the full width of the line defining the parking space or access aisle (502.1, Exception).