36 CFR Part 1192 Americans with Disabilities Act (ADA) Accessibility Guidelines for Transportation Vehicles (2016 Non-Rail Vehicle Guidelines)
T402.11 Gaps.
When ramps or bridgeplates are deployed for boarding and alighting, gaps between the ramp or bridgeplate surface and floor of non-rail vehicles shall not permit passage of a sphere more than 5/8 inch (16 mm) in diameter.
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