Tread Width.
The visible trail surface measured perpendicular to the direction of travel.
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Clear Tread Width. The width of the usable trail tread and adjacent usable surface.
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Minimum Tread Width. The width of the usable part of the tread width at the narrowest point on a trail.
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Minimum Trail Width. The width of the trail tread and the adjacent usable surface at the narrowest point on a trail.
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