"Motorcycle" means a motor vehicle designed to travel on not more than three wheels in contact with the ground, on which the driver:
(1) Rides on a seat or saddle and the motor vehicle is designed to be steered with a handlebar; or
(2) Rides on a seat in a partially or completely enclosed seating area that is equipped with safety belts and the motor vehicle is designed to be steered with a steering wheel.
"Motorcycle" excludes a farm tractor, a power wheelchair, an electric personal assistive mobility device, a motorized foot scooter, an electric-assisted bicycle, and a moped.
"Motor-driven cycle" means every motorcycle, including every motor scooter, with a motor that produces not to exceed five brake horsepower (developed by a prime mover, as measured by a brake applied to the driving shaft). A motor-driven cycle does not include a moped, a power wheelchair, a motorized foot scooter, or an electric personal assistive mobility device.
http://apps.leg.wa.gov/rcw/default.aspx?cite=46.04.332
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