Monroe Township (Middlesex County), NJ Noise Ordinances: Vehicle Noise (2026)

Article II of Chapter 69, the Noise Control Ordinance for Mobile Sources, governs vehicle noise in Monroe Township, Middlesex County. Section 69-14A(1)(a) bars operating any motor vehicle or motorcycle not equipped with an original muffler or equivalent replacement in good working order and in constant operation. Section 69-14A(1)(b) bars removing or rendering inoperative a muffler, other than for maintenance, repair or replacement. Section 69-12 defines a muffler as a sound dissipative device or system for abating the sound of escaping gases of an internal-combustion engine.

Horns are covered by § 69-14A(2). Sounding any horn or auditory signaling device on a public right-of-way or public space is a violation except as a warning of danger, and any horn that exceeds 100 dBA at 25 feet is a violation regardless of purpose. Section 69-14A also sets a Table I maximum sound level for each vehicle class, measured at 50 feet from the center line of travel, and § 69-14A(3) limits idling to three minutes in any hour within 150 feet of a residential area from 8:00 p.m. to 8:00 a.m. when the vehicle is stationary for reasons other than traffic congestion.

Two other rules touch vehicles. Section 69-17 makes engine-braking unlawful at any time on any road in the Township, with exceptions for protecting persons or property, and the Township is authorized to post signs. Section 69-7B(1)(a) bars sound reproduction systems operated in a motor vehicle on a public right-of-way if they create unnecessary noise at 50 feet from the device. The Police Department can stop any motor vehicle or motorcycle reasonably suspected of violating the article under § 69-13B.