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such that a 4-inch diameter sphere cannot pass through. <br /> (509.2 & 509.2) <br />10. The maximum slope of a ramp on an accessible route is 1 <br /> vertical to 12 horizontal, The ramp shall be at least 26 <br /> inches in clear width. Ramps and Landings with drop-offs <br /> shall have curbs, walls or projecting surfaces that prevent <br /> people from slipping off the ramp. Curbs shall be at least <br /> 2 inches high and/or extended platforms shall be at least <br /> <br /> <br />