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<br />appropriate. Grade-separated crossings must also conform to Americans with Disabilities Act (ADA) <br />requirements. <br /> Figure 38. Grade-separated crossings sometimes are used when other measures are not feasible to <br />provide safe pedestrian crossings. <br /> <br />• Using various pedestrian warning signs, flashers, and other traffic control devices to supplement <br />marked crosswalks (figure 39). However, the effects of supplemental signs and other devices at <br />marked crosswalks are not well known under various roadway conditions. According to the <br />MUTCD, pedestrian crossing signs should only be used at locations that are unusually hazardous, <br />where crossing activity is unexpected, or at locations where pedestrian crossing activity is not readily <br />apparent.(2) <br /> <br /> Figure 39. Pedestrian warning signs sometimes are used to supplement crosswalks. <br /> <br />• Building narrower streets in new communities to achieve desired vehicle speeds. <br /> <br />• Increasing the frequency of two-lane or three-lane arterials when designing new street networks so <br />that fewer multilane arterials are required. <br /> <br />It is recommended that parking be eliminated on the approach to uncontrolled crosswalks to improve <br />vision between pedestrians and motorists. The 2000 Uniform Vehicle Code specifies that parking should <br />be prohibited within an intersection on a crosswalk, and within 6.1 m (20 ft) of a crosswalk at an <br />intersection (which could be increased to 9.1 to 15.25 m (30 to 50 ft) in advance of a crosswalk on a high- <br />speed road.(1) <br /> <br /> 58