Vehicles cannot circulate on public roads if **they emit noise levels above the established limits**. This is because excessive noise is considered a form of pollution. To reduce noise pollution, it is important to avoid causing unnecessary noise, such as excessive use of the horn or poorly adjusted loads that may collide and make noise inside the vehicle.


Furthermore, although vehicles also pollute by emitting toxic gases, the specific traffic regulations focus on noise control to ensure a healthier and less annoying environment for everyone. Therefore, it is crucial to keep the vehicle in good condition to avoid both noise and atmospheric pollution.