Mount Prospect, IL Noise Ordinances: Vehicle Noise (2026)
Key Facts
- Governing section
- Village Code § 18.1529 (Chapter 18, Article XV)
- Exhaust rule
- Adequate muffler in constant operation; no cutout or bypass
- Stereo rule
- No sound device that attracts attention outside the vehicle
- Exceptions
- Governmental units' official vehicles and devices; chapter 21 uses
- Penalty
- Fine under appendix A, division III (§§ 18.1543, 18.1905)
- Enforcement
- Village police officers, with a citation option
Summary
In the Village of Mount Prospect, every motor vehicle on a village street must carry an adequate muffler or exhaust system in constant operation. Cutouts and bypasses are banned, exhaust modifications that amplify noise are banned, and no person can run a vehicle stereo or radio so that people outside the car are drawn to the sound.
A. Every motor vehicle driven or operated upon the highways or streets of this village shall at all times be equipped with an adequate muffler or exhaust system in constant operation and properly maintained to prevent any excessive or unusual noise and annoying smoke. B. No such muffler or exhaust system shall be equipped with a cutout, bypass or similar device. No person shall modify the exhaust system of a motor vehicle or squeal the tires thereof or unnecessarily race his motor while running idle in a manner which will amplify or increase the noise of such vehicle above that emitted by the muffler originally installed on the vehicle or above that emitted by tires normally or above that emitted at normal idle. No person shall use any sound amplifying device, recorded music or radio in or from any vehicle on any street in such manner as to attract the attention of persons outside of such vehicle to the sounds issuing therefrom, excepting herefrom persons in vehicles and devices officially used by governmental units in the exercise of official functions and except as provided in chapter 21 of this code.
Full Breakdown
Section 18.1529 of the Mount Prospect Village Code sets two layers of vehicle noise control. Subsection A is an equipment rule: every motor vehicle driven or operated on the highways or streets of the village must at all times have an adequate muffler or exhaust system, in constant operation and properly maintained, to prevent excessive or unusual noise and annoying smoke. A muffler that has rusted through or fallen off fails that test.
Subsection B turns to conduct and modification. The exhaust system cannot carry a cutout, bypass or similar device. No person can modify the exhaust system, squeal the tires or unnecessarily race the motor while idling in a way that amplifies or increases the vehicle's noise above the following baselines: the noise emitted by the muffler originally installed on the vehicle, the noise emitted by tires normally, and the noise emitted at normal idle. The code measures against the vehicle's own original equipment rather than a decibel reading, so the question is whether the vehicle is louder than it was when built.
The same subsection covers car stereos. No person can use a sound amplifying device, recorded music or radio in or from any vehicle on any street in such manner as to attract the attention of persons outside of the vehicle to the sounds issuing from it. The test is whether the sound draws attention outside the vehicle, not a fixed distance or a volume setting. Two exceptions are printed: persons in vehicles and devices officially used by governmental units in the exercise of official functions, and uses provided for in chapter 21 of the Village Code.
The section sits in Article XV, Equipment of Vehicles, of Chapter 18. Section 18.1543 sends violations of the article to the penalties in section 18.1905, which sets a fine under appendix A, division III of the Village Code. Section 18.1905 also lets any village police officer issue a citation for an Article XV violation instead of filing a complaint in court in the first instance.
Violations & Fines
A violation is punished by a fine set in appendix A, division III of the Village Code, under sections 18.1543 and 18.1905. Village police officers enforce the section on the street and can issue a citation instead of filing a complaint in court. The conduct the text reaches includes a removed muffler, a cutout or bypass on the exhaust, squealing tires, racing the engine at idle, and a stereo loud enough to draw attention from outside the car.
Frequently Asked Questions
Is a loud car stereo illegal in the Village of Mount Prospect?
Can I remove my muffler or add a cutout to my car?
Do the vehicle noise rules exempt any vehicles?
What is the penalty for a vehicle noise violation in Mount Prospect?
Sources & Official References
Other rules in Mount Prospect
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