ABA Accessibility Standard for GSA Facilities Pocket Guide
810.5 Rail Platforms.
Rail platforms shall comply with 810.5.
810.5.1 Slope.
Rail platforms shall not exceed a slope of 1:48 in all directions.
EXCEPTION: Where platforms serve vehicles operating on existing track or track laid in existing roadway, the slope of the platform parallel to the track shall be permitted to be equal to the slope (grade) of the roadway or existing track.
810.5.2 Detectable Warnings.
Platform boarding edges not protected by platform screens or guards shall have detectable warnings complying with 705 along the full length of the public use area of the platform.
810.5.3 Platform and Vehicle Floor Coordination.
Station platforms shall be positioned to coordinate with vehicles in accordance with the applicable requirements of 36 CFR Part 1192. Low-level platforms shall be 8 inches (205 mm) minimum above top of rail.
EXCEPTION: Where vehicles are boarded from sidewalks or street-level, low-level platforms shall be permitted to be less than 8 inches (205 mm).
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