A Washington State DOT guide to designing shared-use paths.
Chapter 1515 - Shared Use Paths - Design Manual M 22-01
Shared-use paths are designed for both transportation and recreation purposes and are used by pedestrians, bicyclists, skaters, equestrians, and other users. Some common locations for shared-use paths are along rivers, streams, ocean beachfronts, canals, utility rights of way, and abandoned railroad rights of way; within college campuses; and within and between parks as well as within existing roadway corridors. A common application is to use shared-use paths to close gaps in bicycle networks. There might also be situations where such facilities can be provided as part of planned developments. Where a shared-use path is designed to parallel a roadway, provide a separation between the path and the vehicular traveled way in accordance with this chapter.
Published September 01, 2019
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