Protruding Object.
A constructed feature such as a sign that extends into the trail tread more than 4 inches (100 mm) between 27 inches (685 mm) and 80 inches (2030 mm) above the trail tread. Accessibility guidelines for protruding objects do not apply to naturally occurring objects, such as tree branches, or rock ledges. However, safety regulations or Forest Service construction and maintenance standards may define clear space and limit overhangs of natural protruding objects.
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