A shared-use path serves as part of a transportation circulation system and supports multiple recreation opportunities, such as walking, bicycling, and inline skating. A shared-use path typically has a surface that is asphalt, concrete, or firmly packed crushed aggregate.
A Washington State DOT guide to designing shared-use paths.
Encouraging different types of users to share the trail is just as important on urban trails as it is on backcountry trails.
Generally there are no difficulty ratings for OHV trails.
Survey of skills and competencies to assist in developing a national training strategy for National Scenic and Historic Trails