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dvisory R303.2 Types. This provision permits a combination of ramps and blended <br />transitions. <br />It will sometimes be necessary to limit the run of a parallel or perpendicular ramp in <br />order to avoid `chasing grade' indefinitely. In new construction at standard curb <br />heights, required level landings can provide a datum for measuring most curb ramp <br />slopes. <br />Limiting new ramps to an 8.3% slope on steep routes will result in a slight increase in <br />grade on the balance of the route, but will. facilitate street crossing and a timely and <br />manageable ascent to the sidewalk, particularly important when crossing in traffic.= <br />R303.2.1 Perpendicular Curb Ramps. Perpendicular curb ramps shall have a <br />running slope that cuts through or is built up to the curb at right angles or meets <br />the gutter grade break at right angles. <br />R303.2.1.1 Running Slope. The running slope shall be 5 percent <br />minimum and 8.3 percent maximum but shall not require the ramp length <br />to exceed 4.5 m (15.0 ft). <br />R303.2.1.2 Cross Slope. The cross slope at intersections shall be 2 <br />percent maximum. The cross slope at midblock crossings shall be <br />permitted to be warped to meet street or highway grade. <br />R303.2.1.3 Landing. A landing 1.2 m (4.0 ft) minimum by 1.2 m (4.0 ft) <br />minimum shall be provided at the top of the curb ramp and shall be <br />permitted to overlap other landings and clear space. Running and cross <br />slopes at intersections shall be 2 percent maximum. Running and cross <br />slope at midblock crossings shall be permitted to be warped to meet street <br />or highway grade. <br />R303.2.1.4 Flares. Flared sides with a slope of 10 percent maximum, <br />measured parallel to the curb line, shall be provided where a pedestrian <br />circulation path crosses the curb ramp. <br />Advisory R303.2.1.4 Flares. Sides of ramps may be returned, providing useful directional <br />cues, if protected from cross travel by landscaping, street furniture, poles, or equipment. <br />R303.2.2 Parallel Curb Ramps. Parallel curb ramps shall comply with <br />R303.2.2, and shall have a running slope that is in -line with the direction of <br />sidewalk travel. <br />R303.2.2.1 Running Slope. The running slope shall be 5 percent <br />minimum and 8.3 percent maximum but shall not require the ramp length <br />to exceed 4.5 m (15.0 ft). <br />35 <br />