86 A SUMMARY OFACCESSIBILITY STANDARDS FOR OUTDOOR DEVELOPEDAREAS accessibility standards for Federal outdoor developed areas Clear Width [1018 4] The clear width of beach access routes must be a minimum of 60 inches to enable people using mobility devices to pass people traveling in the opposite direction without veering off the firm and stable surface into the sand. The clear width of beach access routes that are not removable can be reduced to a minimum of 48 inches at dune crossings. Beach wheelchairs are not a substitute for providing beach access routes. Beach wheelchairs have large, wide wheels that can roll across sand without sinking but do not provide independent access. When gates or barriers are installed to control beach access, the gates or barriers must allow the passage of mobility devices, including beach wheel- chairs. Gates or barriers should provide clear openings at least 48 inches wide for beach wheelchairs. Obstacles [1018 5] Changes in the vertical alignment of boards or the connection points for removable sections of beach access routes can be obstacles to beach access. When beach access routes are constructed of concrete, asphalt, or boards, obstacles cannot exceed one-half inch in height at their highest point. When beach access routes are constructed of materials other than concrete, asphalt, or boards, obstacles cannot exceed 1 inch in height at their highest point. Where possible, separate obstacles that cross the entire beach access route by at least 48 inches so that people using mobility devices can fully cross one obstacle before confronting another.