Drivers blaring music — often with windows down — so loud that other motorists can literally feel vibrations from several cars away.
Motorcyclists repeatedly revving their engines unnecessarily.
Car "tuners" with "two-step rev limiters" and similar modifications, which may serve a purpose on a racetrack, but the gunshot-like explosions they cause can startle dogs and people alike.
Beyond being inconsiderate and annoying, excessive noise is unhealthy.
According to a 2011 study by the World Health Organization, "Among environmental factors in Europe, environmental noise leads to a disease burden that is second in magnitude only to that from air pollution."
The study found that traffic-related noise "accounts for over 1 million healthy years of life lost annually to ill health, disability or early death" in the areas studied.
And the U.S. Environmental Protection Agency said, "Problems related to noise include stress related illnesses, high blood pressure, speech interference, hearing loss, sleep disruption, and lost productivity."