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2013 Forest Service Trail Accessibility Guidelines (FSTAG)

5.3.2.3 Slope.

The slope of the turning space and clear floor or ground space surface shall not be steeper than 1:48 (2 percent) in all directions.

Exception: When the surface is not paved or is not elevated above the natural ground, slopes not steeper than 1:20 (5 percent) shall be permitted where necessary for drainage

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