This bill amends New Jersey's motor vehicle laws to prohibit the installation or modification of mufflers and exhaust systems in a way that amplifies or increases the noise emitted beyond the original specifications of the vehicle. Specifically, it introduces new language stating that no person shall modify the exhaust system of any motor vehicle to produce louder sounds than what was originally installed. Additionally, it establishes that the penalties for such violations will be significantly increased, with fines up to $500 or imprisonment for up to 30 days, compared to the current penalty of only $25 for similar offenses.

Furthermore, the bill includes provisions regarding the use of horns and audible warning devices on vehicles, ensuring that they do not emit unreasonably loud sounds. It also prohibits bicycles from being equipped with sirens or whistles and grants the commission the authority to set standards for the audibility of warning devices. Overall, the bill aims to reduce noise pollution from motor vehicles and enhance public safety on the roads.