42 A SUMMARY OFACCESSIBILITY STANDARDS FOR OUTDOOR DEVELOPEDAREAS accessibility standards for Federal outdoor developed areas Running Slope [1016 71] Running slope, also referred to as grade, is the lengthwise slope of an ORAR, parallel to the direction of travel. ORAR sections of any length may be constructed with a running slope up to 1:20 (5 percent). To accommodate steep terrain, ORARs may be designed with shorter sections that have a steeper running slope and length, as shown in table 3, with resting intervals at the top and bottom of each section. The running slope of any section of an ORAR must never exceed 1:10 (10 percent). Table 3—Maximum Running Slope and Segment Length Running Slope of Segment of Outdoor Recreation Access Route Maximum Length of Segment Steeper Than But Not Steeper Than 1:20 (5%) 1:12 (8.33%) 50 feet 1:12 (8.33%) 1:10 (10%) 30 feet Cross Slope [1016 72] Cross slope is the side-to-side slope of the surface of an ORAR. When the surface is constructed of concrete, asphalt, or boards, the cross slope must be no steeper than 1:48 (2 percent). When the surface is constructed of materials other than concrete, asphalt, or boards, cross slopes no steeper than 1:20 (5 percent) are allowed when necessary for drainage.