(8) Platform entrance ramp. The entrance ramp, or loading-edge barrier used as a ramp, shall not exceed a slope of 1:8, measured on level ground, for a maximum rise of 3 inches (75 mm), and the transition from roadway or sidewalk to ramp may be vertical without edge treatment up to 1/4 inch (6.5 mm) . Thresholds between 1/4 inch (6.5 mm) and 1/2 inch (13 mm) high shall be beveled with a slope no greater than 1:2.
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