Vehicle noise is governed by New Jersey state law and your town's ordinance, not by Morris County. State law requires working mufflers and bars excessive exhaust noise; local codes add property-line sound limits under N.J.A.C. 7:29.
Morris County does not set vehicle-noise rules. New Jersey regulates motor-vehicle exhaust and muffler noise statewide under Title 39 (N.J.S.A. 39:3-70), which requires every vehicle to have a muffler in good working order and prohibits cutouts, bypasses or amplified exhaust. Local Morris County police enforce these state rules on public roads. Separately, municipal noise ordinances built on N.J.A.C. 7:29 cap continuous sound at a residential property line (65 dBA day, 50 dBA night) and restrict revving, idling and vehicle audio near homes. Enforcement is by municipal or county police, not a county ordinance.
Muffler and exhaust violations are motor-vehicle offenses under N.J.S.A. 39:3-70 with statutory fines; property-line noise is enforced under the local ordinance.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Morris County's vehicle noise rules stack up against other locations.
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