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

Rail platform requirements include specifications for detectable warnings along platform boarding edges not protected by screens or guards (810.5.2). The Board has added clarification that detectable warnings be provided "along the full length of the public use area of the platform."

The proposed rule, consistent with the original ADAAG, provided specifications for the coordination of vehicles and platforms, including maximum changes in level (plus or minus e inch) and horizontal gaps (3 inches for rail vehicles, 1 inch for automated guideway systems). Alternate specifications were provided for existing vehicles and stations. These requirements are paralleled in the Board’s ADA Accessibility Guidelines for Transportation Vehicles.²⁸ For simplicity, the Board has replaced requirements in section 810.5 with references to these specifications as contained in the guidelines for transportation vehicles (810.5.3). This revision does not substantively change the requirements for the coordination of platforms and vehicle floors.