2010 ADA Standards for Accessible Design

CHAPTER 4: ACCESSIBLE ROUTES TECHNICAL 406 Curb Ramps 406.1 General. Curb ramps on accessible routes shall comply with 406, 405.2 through 405.5, and 405.10. 406.2 Counter Slope. Counter slopes of adjoining gutters and road surfaces immediately adjacent to the curb ramp shall not be steeper than 1:20. The adjacent surfaces at transitions at curb ramps to walks, gutters, and streets shall be at the same level. Figure 406.2 Counter Slope of Surfaces Adjacent to Curb Ramps 406.3 Sides of Curb Ramps. Where provided, curb ramp flares shall not be steeper than 1:10. Figure 406.3 Sides of Curb Ramps 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. 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. D1e6p8artment of Justice 2010 Standards: Titles II and III - 131