Wash. Rev. Code § 47.30.060
For the purposes of this chapter, the establishment of paths and trails and the expenditure of funds as authorized by RCW 47.30.030, as now or hereafter amended, shall be deemed to be for highway, road, and street purposes. The department of transportation shall, when requested, and subject to reimbursement of costs, provide technical assistance and advice to cities, towns, and counties in carrying out the purposes of RCW 47.30.030, as now or hereafter amended. The department shall recommend construction standards for paths and trails. The department shall provide a uniform system of signing paths and trails which shall apply to paths and trails under the jurisdiction of the department and of cities, towns, and counties. The department and cities, towns, and counties may restrict the use of paths and trails under their respective jurisdictions to pedestrians, equestrians, and nonmotorized vehicles.
RCW 47.30.060
Severability-1972 ex.s. c 103: See note following RCW 47.30.030.