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

T502 Doorways

T502.1 General.

Doorways in non-rail vehicles shall comply with T502.

T502.2 Doorways with Lifts, Ramps or Bridgeplates.

The vertical clearance at doorways with lifts, ramps or bridgeplates shall comply with T502.2. Vertical clearance shall be measured from the inside finished edge of the door opening to the highest point of the deployed lift, ramp or bridgeplate below.

T502.2.1 Over-the-Road Buses.

For over-the-road buses, the vertical clearance at doorways shall be 65 inches (1650 mm) minimum.

T502.2.2 Other Vehicles.

For other non-rail vehicles, the vertical clearance at doorways shall be 56 inches (1420 mm) minimum on small non-rail vehicles and 68 inches (1725 mm) on large non-rail vehicles.

T502.3 Doorways with Level Boarding.

Doorways on non-rail vehicles designed for level boarding bus systems shall comply with T502.3.

T502.3.1 Clear Width.

Doorways shall provide a clear opening of 32 inches (810 mm) minimum.

T502.3.2 Thresholds.

Thresholds at doorways shall be marked by a stripe. The stripe shall be 1 inch (25 mm) wide minimum and contrast with the rest of the walking surface either light-on-dark or dark-on-light.

T502.4 Doorways with Steps on Over-the-Road Buses.

On over-the-road buses, doorways with steps shall provide an opening with a clear width of 30 inches (760 mm) minimum.

Exceptions: 1. The door opening clear width above a height of 48 inches (1220 mm) measured from the lowest step tread shall be permitted to taper so as to reduce in width to 18 inches (457 mm) minimum.

2. Where compliance with T502.4 is not structurally feasible, the door opening clear width shall be permitted to be 27 in (685 mm) minimum.

3. Hinges and other door mechanisms shall be permitted to protrude 4 inches (100 mm) maximum into the door opening clear width at or below 48 inches (1220 mm) in height measured from the lowest step tread.