ABA Accessibility Standard for GSA Facilities Pocket Guide

1002.4.4.3 Permitted Protrusions in Wheelchair Spaces.

Objects are permitted to protrude a distance of 6 inches (150 mm) maximum along the front of the wheelchair space, where located 9 inches (230 mm) minimum and 27 inches (685 mm) maximum above the floor or ground surface of the wheelchair space. Objects are permitted to protrude a distance of 25 inches (635 mm) maximum along the front of the wheelchair space, where located more than 27 inches (685 mm) above the floor or ground surface of the wheelchair space.

Figure 1002.4.4.3 Protrusions in Wheelchair Spaces in Amusement Rides