A. "dB(A)" means the sound level measured in decibels using the "A" weighing network.

B. "Motorcycle" means any motor vehicle having a saddle for the use of a rider and designed to travel on not more than three wheels in contact with the ground; except that farm tractors and vehicles powered by engines of less than five horsepower shall not be included.

C. "Motor vehicle" means any vehicle which is self-propelled, used primarily for transporting persons or property upon public highways and required to be licensed under RCW 46.16.010.

D. "Motor vehicle racing event" means any competition between motor vehicles and/or off-highway vehicles under the auspices of a sanctioning body licensed by Pierce County.

E. "Muffler" means a device consisting of a series of chambers or other mechanical designs for the purpose of receiving exhaust gas from an internal combustion engine and effective in reducing sound resulting therefrom.

F. "Off-highway vehicle" means any self-propelled motor-driven vehicle not used primarily for transporting persons or property upon public highways not required to be licensed under RCW 46.16.010. "Off-highway vehicle" shall include dirt bikes and all-terrain vehicles, but shall not include special construction vehicles.

G. "Person" means any individual, firm, association, partnership, corporation or any other entity, public or private.

H. "Property boundary" means the surveyed line at ground surface, which separates the real property owned, rented or leased by one or more persons, from that owned, rented or leased by one or more other persons, and its vertical extension.

I. "Real property" means an interest or aggregate of rights in land which is guaranteed and protected by law. "Real property" includes a leasehold interest.

J. "Receiving property" means any real property within which sound originating from sources outside the property is received.

K. "Sound level meter" means a device which measures sound pressure levels and conforms to Type 1, S1A, 2 or S2A, as specified in the American National Standards Institute Specifications.

L. "Special construction vehicle" means any vehicle which is designed and used primarily for grading, paving, earth moving, and other construction work; and which is not designed or used primarily for the transportation of persons or property on a public highway, and which is only incidentally operated or moved over the highway.

M. "Warning device" means any device intended to provide warning of potentially hazardous, emergency or illegal activities including but not limited to an alarm system or vehicle back-up signal.