ABA Accessibility Standard for GSA Facilities Pocket Guide

406.4 Landings.

Landings shall be provided at the tops of curb ramps. The landing clear length shall be 36 inches (915 mm) minimum. The landing clear width shall be at least as wide as the curb ramp, excluding flared sides, leading to the landing. [ECTCR UFAS 4.7.5]

EXCEPTION: In alterations, where there is no landing at the top of curb ramps, curb ramp flares shall be provided and shall not be steeper than 1:12.

Figure 406.4 Landings at the Top of Curb Ramps