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

T402.3 Installation and Operation.

When used for boarding and alighting, ramps and bridgeplates shall be firmly attached to the non-rail vehicle to prevent displacement. Ramps and bridgeplates provided on large non-rail vehicles shall be permanently installed and power operated.

EXCEPTION: Ramps and bridgeplates on large non-rail vehicles that serve only designated stops with boarding platforms providing level boarding and alighting shall not be required to be permanently attached and power operated provided that portable ramps or bridgeplates capable of deployment to the roadway are carried onboard.