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addition to providing "Continental" markings, "Rectangular Rapid Flashing <br />Beacons" may be required to increase the visibility of and call attention to the <br />crossing. <br />4. Mid -block crossings shall be marked crosswalks. Mid -block crossing. shall be <br />marked with "continental" style markings where pedestrian refuge islands are <br />present. In addition to providing crosswalk markings, "Continental" style markings <br />and/or "Rectangular Rapid Flashing Beacons" and/or hybrid. pedestrian signals <br />may be required to increase the visibility of and call attention to the crossing <br />provided they are warranted by an engineering study and approved by the City of <br />Eugene Traffic Engineer. Guidelines for implementing a mid -block crossing are <br />found in the Design Standards and Guidelines for Streets, Sidewalks, Bikeways, and <br />Accessways (provided in Appendix E and on the internet at www.eugene-or.l;ov). <br />F. Curbs <br />1. Elevation below 100 -Year Flood <br />Top of curb shall be no more than 2 feet below the Federal Emergency Management <br />Agency (FEMA) designated 100 -year floodway elevation. <br />2. Height <br />The standard required curb reveal is 6 inches. <br />3. Return Radii <br />Curb return radii shall be 20 feet for street widths equal to or greater than 28 feet, or <br />30 feet for street widths less than 28 feet; unless other radii is required to <br />accommodate pedestrians, emergency vehicles, buses, or trucks. Curb return radii <br />shall be designed to accommodate the largest design vehicle, as designated by the <br />City likely to use that facility, without driving over the curb and/or access ramps. If the <br />City grants an exception to this requirement, ramps and sidewalk which could receive <br />vehicle wheel loading shall be constructed with concrete at least 7 inches thick. <br />The designer shall demonstrate via modeling software (i.e., AutoTURN® or equivalent) <br />that the designated design vehicle can navigate all turns within the curbs on local <br />streets and within the travel lane on arterial and collector streets. The boundaries of <br />the turning path of the design vehicle when making the turn are established by the <br />outer trace of the front overhang and the path of the inner rear wheel. Regardless of <br />the designated design vehicle, the designer shall demonstrate a turning path having <br />Public Improvement Design Standards Manual, 2016 Page 2-19 <br />