36 CFR Part 1192 Americans with Disabilities Act (ADA) Accessibility Guidelines for Transportation Vehicles (2016 Non-Rail Vehicle Guidelines)
T302.4 Surface Discontinuities.
Surface discontinuities shall be ½ inch (13 mm) high maximum and shall be beveled with a slope not steeper than 1:2.
EXCEPTIONS: 1. Surface discontinuities ¼ inch (6.4 mm) high maximum shall not be required to be beveled.
2. Steps complying with T405 shall be permitted on walking surfaces that are not part of a passenger access route.
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