RCW 46.04.670: Vehicle.

(1) "Vehicle" means a 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.

(2) "Vehicle" excludes:

(a) A power wheelchair or device other than a bicycle moved by human or animal power or used exclusively upon stationary rails or tracks;

(b) A moped, for the purposes of chapter 46.70 RCW;

(c) A bicycle or a motorized foot scooter, for the purposes of chapter 46.12, 46.16A, or 46.70 RCW, or for RCW 82.12.045;

(d) An electric personal assistive mobility device or a motorized foot scooter, for the purposes of chapter 46.12, 46.16A, 46.29, 46.37, or 46.70 RCW;

(e) A golf cart, except for the purposes of chapter 46.61 RCW; and

(f) A personal delivery device as defined in RCW 46.75.010, except for the purposes of chapter 46.61 RCW.