90 A SUMMARY OFACCESSIBILITY STANDARDS FOR OUTDOOR DEVELOPEDAREAS accessibility standards for Federal outdoor developed areas Dune Crossings [1018 10] A dune crossing that is part of a beach access route and has a slope that exceeds 1:20 (5 percent) must also provide handrails that comply with sec- tion 505 of the ABA Standards and must also provide edge protection. The handrails must be continuous at a height of 34 to 38 inches above the walk- ing surface along both sides of the dune crossing (figure 32). Edge protection in the form of a curb or barrier must prevent the passage of a 2-inch sphere where any portion of the sphere is within 2 inches of the dune crossing sur- face. The technical requirements for dune crossings do not address the verti- cal pickets provided in some handrail designs. When a dune crossing is part of a beach access route, the clear width of the beach access route may be reduced from a minimum of 60 inches to a min- imum of 48 inches. Where a removable beach access route is provided as a dune crossing, the beach access route technical provisions for running slope, cross slope, and resting intervals do not apply. When the running slope of a non-removable segment of a dune crossing is steeper than 1:20 (5 percent), the maximum length of the segment is specified in table 6, and a resting interval must be provided at the top and bottom of each segment. Figure 32—Minimum width and handrail height requirements for dune crossings.