RCW 46.37.539: Motorcycles and motor-driven cycles—Additional requirements and limitations.

Every motorcycle and every motor-driven cycle shall also comply with the requirements and limitations of:

RCW 46.37.380 on horns and warning devices;

RCW 46.37.390 on mufflers and prevention of noise;

RCW 46.37.400 on mirrors; and

RCW 46.37.420 on tires.