1. (1) No person shall operate any motor vehicle or any combination of such vehicles upon any public highway under any conditions of grade, load, acceleration or deceleration in such a manner as to exceed the maximum permissible sound levels for the category of vehicle in Table I, as measured at a distance of 50 feet (15.2 meters) from the center of the lane of travel within the speed limits specified, under procedures established by the state commission on equipment in chapter 204-56 WAC, "procedures for measuring motor vehicle sound levels."

   Table I

   IN-USE MOTOR VEHICLE NOISE PERFORMANCE STANDARDS

   Measured @ 50 feet (15.2 meters)

   		Maximum Sound Level,dBA Speed Zones
   VehicleCategory(type)	EffectiveDate	45 mph(72 kph)or less	Over45 mph(72 kph)	Stationary Test
   Motorcycles	July 1, 1980	78	82	N/A
   Automobiles, light trucks and all other motor vehicles 10,000 pounds (4536 kg) GVWR or less	July 1, 1980	72	78	N/A
   		35 mph(56 kph)or less	Over35 mph(56 kph)
   All motor vehicles over 10,000 pounds (4536 kg) GVWR	June 1, 1977 1986 and after	86Reserved	90Reserved	86Reserved

2. (2) Every motor vehicle operated upon the public highways shall at all times be equipped with an exhaust system and a muffler in good working order and constant operation to prevent excessive or unusual noise.
3. (3) No person shall operate a motor vehicle in such a manner as to cause or allow to be emitted squealing, screeching or other such noise from the tires in contact with the ground because of rapid acceleration or excessive speed around corners or other such reason, except that noise resulting from emergency braking to avoid imminent danger shall be exempt from this provision.
4. (4) No person shall operate any motor vehicle upon any public highway if the vehicle exhaust system exceeds the maximum permissible sound levels of Table II for the category and year of vehicle, as measured at a distance of twenty inches (0.5 meter) from the exhaust outlet under procedures established by the state commission on equipment in chapter 204-56 WAC, "procedures for measuring motor vehicle sound levels."

5. (5) No person shall sell or offer for sale a new motor vehicle except an off-highway vehicle, which produces a maximum noise exceeding the noise levels in Table III at a distance of 50 feet (15.2 meters) under acceleration test procedures established by the state commission on equipment in chapter 204-56 WAC, "procedures for measuring motor vehicle sound levels."

   Table II

   IN-USE MOTOR VEHICLE EXHAUST SYSTEM NOISE PERFORMANCE STANDARDS

   Measured @ 20 inches (0.5 meters)

   Vehicle Category (type)	Model Year	Maximum Sound Level, dBA
   Motorcycles	before 19861986 and after	99(reserved)
   Automobiles, light trucks and all other motor vehicles 10,000 pounds (4536 kg) GVWR or less	before 19861986 and after	95(reserved)

   Table III

   MAXIMUM SOUND LEVELS FOR NEW MOTOR VEHICLES

   Measured @ 50 feet (15.2 meters)

   Vehicle Category (type)	Date of Manufacture	Maximum Sound Level, dBA
   Any motor vehicleover 10,000 pounds (4536 kg)GVWR excluding buses	before January 1, 1978after January 1, 1978 after January 1, 1982	868380
   All buses over10,000 pounds(4536 kg) GVWR	after January 1, 1980after January 1, 1983after January 1, 1986	858380
   Motorcycles	after January 1, 1976after January 1, 1986	8380
   Automobiles, light trucks and all other motor vehicles 10,000 pounds (4536 kg) GVWR or less	after January 1, 1976	80

[Statutory Authority: Chapter 70.107 RCW. WSR 80-14-041 (Order DE 80-29), § 173-62-030, filed 9/30/80; Order DE 77-2, § 173-62-030, filed 6/1/77; Order DE 75-17, § 173-62-030, filed 8/11/75; Order DE 74-33, § 173-62-030, filed 1/30/75, effective 7/1/75.]