36 CFR Part 1192 Americans with Disabilities Act (ADA) Accessibility Guidelines for Transportation Vehicles (2016 Non-Rail Vehicle Guidelines)

T404 Level Boarding and Alighting

T404.1 General.

Boarding and alighting at boarding platforms in level boarding bus systems shall comply with T404.

T404.2 Vehicle Floor and Boarding Platform Coordination.

The design of non-rail vehicles shall be coordinated with the boarding platforms to minimize the gap between the vehicle floor and the boarding platforms.

T404.3 Ramps and Bridgeplates.

Where the space between the floor of non-rail vehicles and a boarding platform is greater than 2 inches (51 mm) horizontally or 5/8 inch (16 mm) vertically when measured at 50 percent passenger load with the vehicle at rest, non-rail vehicles shall provide ramps or bridgeplates complying with T402.