RCW 46.04.670 Definition of “Vehicle”
"Vehicle" includes every device capable of being moved upon a public highway and in, upon, or by which any persons or property is or may be transported or drawn upon a public highway, excepting devices moved by human or animal power or used exclusively upon stationary rails or tracks, except that mopeds shall be considered vehicles or motor vehicles for the purposes of chapter 46.12 RCW, but not for the purpose of chapter 46.70 RCW.
Looking for more information? Check out these articles:
Lamps and other Equipment
Clinging to Vehicles
Riding on Bicycles
Riding on Roadways and Bicycle Paths
Traffic Laws apply to Persons Riding Bicycles
Effects of Regulations
Riding under the Influence
Definition of "Roadway"
Definition of "Highway"
Definition of "Hours of Darkness"
Definition of "Bicycle"