Wash. Rev. Code § 46.04.710
"Wheelchair conveyance" means any vehicle specially manufactured or designed for the transportation of a physically or medically impaired wheelchair-bound person. The vehicle may be a separate vehicle used in lieu of a wheelchair or a separate vehicle used for transporting the impaired person while occupying a wheelchair. The vehicle shall be equipped with a propulsion device capable of propelling the vehicle within a speed range established by the state patrol. The state patrol may approve and define as a wheelchair conveyance, a vehicle that fails to meet these specific criteria but is essentially similar in performance and application to vehicles that do meet these specific criteria.
RCW 46.04.710
Construction-Application of rules-Severability-1987 c 330: See notes following RCW 28B.12.050.
Severability-1983 c 200: "If any provision of this act or its application to any person or circumstance is held invalid, the remainder of the act or the application of the provision to other persons or circumstances is not affected." [ 1983 c 200 s 7.]
Power wheelchairs: RCW 46.04.415.
Wheelchair conveyances
operator's license: RCW 46.20.109.
public roadways, operating on: RCW 46.61.730.
registration: RCW 46.16A.405(3).
safety standards: RCW 46.37.610.