2013 Forest Service Trail Accessibility Guidelines (FSTAG)

Slope.

The incline of a surface.

• Cross Slope.  The percentage of rise to length, which is the difference in elevation,  when measuring the trail tread from edge to edge perpendicular to the direction of travel This may be expressed as the percentage of change in elevation or as a ratio of vertical distance to horizontal distance.  The percentage is shown in parentheses in these guidelines.

• Running Slope (Grade).  The ascent or descent of a trail segment expressed as a percentage of its length, which is the difference in elevation of a section of a trail measured parallel to the predominant direction of travel. This may be expressed as a ratio of vertical distance to horizontal distance or as the percentage of change in elevation.  The percentage is shown in parentheses in these guidelines.