Modified exhaust systems, loud car stereos audible more than 50 feet, and prolonged horn use are prohibited in Frisco under City Code and TX Transportation Code 547.604.
Frisco Code Chapter 66 (Offenses) bans vehicle-related sound nuisances, operating alongside TX Transportation Code §547.604 and §547.605, which require every motor vehicle to have a muffler in good working order and prohibit modifications that amplify exhaust noise above manufacturer specifications. A car stereo audible from more than 50 feet is a primary violation and routinely enforced on Preston Road, along the Star District, and near the Frisco Station entertainment corridor. Prolonged horn use except as a warning is prohibited under TX Transportation Code §547.501. Frisco PD traffic officers may cite without a prior warning — vehicle noise is treated under transportation law, not the disorderly-conduct warning regime of TX Penal Code §42.01. Jake brake / engine compression braking is discouraged within city limits along the Dallas North Tollway and SH 121 frontage roads, and signage is posted in residential stretches. Frisco frequently coordinates with Collin County and Denton County sheriffs on loud-exhaust enforcement along shared boundaries.
Class C misdemeanor citation up to $200 per TX Transportation Code. Repeat offenders may face vehicle inspection failure at next annual safety check.
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