accessibility standards for Federal outdoor developed areas 25 Table 2—Maximum Running Slope and Segment Length Running Slope of Trail Segment Maximum Length of Segment Steeper Than But Not Steeper Than 1:20 (5%) 1:12 (8.33%) 200 feet 1:12 (8.33%) 1:10 (10%) 30 feet 1:10 (10%) 1:8 (12%) 10 feet To ensure that a trail is not designed as a series of steep segments, no more than 30 percent of the total length of the trail may have a running slope exceeding 1:12 (8.33 percent). The running slope must never exceed 1:8 (12 percent). Resting intervals must be provided more frequently as the running slope increases (figure 8). Figure 8—The running slope is measured along a trail’s length; the cross slope is measured across its width. Trail Running Slope Whenever possible, trails should be constructed with lesser slopes to provide greater independent access and usability.
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