Castle Rock enforces vehicle noise through the adopted Colorado Model Traffic Code plus CRS 42-4-225: every vehicle must have an adequate muffler in constant operation to prevent excessive or unusual noise. Loud exhaust and revving are cited.
Castle Rock has adopted the Colorado Model Traffic Code by reference (Municipal Code Title 10), so state vehicle-equipment standards apply on Town streets. Under Colorado Revised Statute 42-4-225, every motor vehicle must be equipped with an adequate muffler in constant operation and properly maintained to prevent excessive or unusual noise; cutouts, bypasses and amplifying devices are prohibited. Loud stereos in vehicles also fall under the general noise code (Chapter 9.16), which limits sound audible 100 feet away. Castle Rock Police enforce both on Town roadways; there is no separate Douglas County vehicle-noise rule inside town limits.
Muffler and exhaust-noise violations are traffic citations under the Model Traffic Code / CRS 42-4-225, carrying fines and points. Report through Police non-emergency 303-663-6100.
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