Motor vehicles and motorcycles on public rights-of-way. No person shall cause, suffer, allow or permit the operation of a public or private motor vehicle or motorcycle on a public right-of-way at any time in such a manner that the sound level emitted by the motor vehicle or motorcycle exceeds the level set forth in Table II.
Table II Maximum Permissible Sound Levels from
Motor Vehicles and Motorcycles
Sound Level, in dBA, at 50 Feet (15 Meters)
From Center Line of Vehicle Travel1
Vehicle Class
Speed Limit 35 mph or Less
Speed Limit Over 35 mph
Stationary Run-Up
Motor carrier vehicle engaged in interstate commerce of GVWR or GCWR of 10,000 pounds or more
86
90
88
All other motor vehicles of GVWR or GCWR of 10,000 pounds or more
86
90
--
Any motorcycle
82
86
--
Any other motor vehicle or any combination of vehicles towed by any motor vehicle
76
82
--
Sound Level on Fast Setting, in dBA, at 15 Feet From
Edge of Lane of Vehicle Travel
Vehicle Class
Speed Limit 35 mph or Less
Any motor vehicle or motorcycle with a GVWR less than 10,000 pounds
80
1 NOTES: Measured according to Department of Transportation, Bureau of Motor Carrier Safety Regulations for enforcement of Motor Carrier Noise Emission Standards, Title 49, Code of Federal Regulations, Chapter II, Part 325.
No person shall operate or cause to be operated any recreational motorized vehicle in such a manner that the sound level emitted therefrom exceeds the limits set forth in Table III at either a distance of 50 feet (15 meters) or more from the path of the vehicle when operated on a public space or at or across a real property line when operated on private property. This section shall apply to all recreational motorized vehicles, whether or not duly licensed or registered.
Table III
Maximum Permissible Sound Levels for
Recreational Motorized Vehicles Operated
Off Public Rights-of-Way
Vehicle Type
Sound Level
(in dBA)
Motorcycle
Unit manufactured before 1975
86
Unit manufactured after 1975
84
Any other vehicle
Unit manufactured before 1975
84
Unit manufactured after 1975
80
A. 
Adequate mufflers.
(1) 
No person shall cause, suffer, allow or permit the operation of any motor vehicle or motorcycle not equipped with the original muffler and other components or equivalent replacement in good working order and in constant operation regardless of the sound level produced.
(2) 
No person shall remove or render inoperative, or cause to be removed or rendered inoperative, other than for purposes of maintenance, repair or replacement, any muffler or other exhaust component on a motor vehicle or motorcycle.
B. 
Motor vehicle horns and signaling devices. The following acts and the causing thereof are declared to be in violation of this chapter:
(1) 
The sounding of any horn or other auditory signaling device in any motor vehicle or motorcycle on any public right-of-way or public space, except as a warning of danger.
(2) 
The sounding of any horn or other auditory signaling device that produces a sound level in excess of 100 dBA's at 25 feet (7.5 meters).
C. 
Standing motor vehicles. No person shall operate or permit the operation of any motor vehicle or any auxiliary equipment attached to such a vehicle for a period longer than three minutes in any hour which the vehicle is stationary for reasons other than traffic congestion or emergency work on a public right-of-way or public space within 150 feet (46 meters) of a residential area between the hours of 8:00 p.m. and 8:00 a.m. the following day.
D. 
Sound reproduction device. No person shall cause, suffer, allow or permit the operating or playing of any radio, tape player or similar device that reproduces or amplifies sound in such a manner as to create noise at 50 feet (15 meters) from such device, when operating in or on a motor vehicle on a public right-of-way or public space.