Idling an engine over ten consecutive minutes so it's plainly audible in a dwelling at night is unlawful in Salem. Dynamic (jake) braking is banned except to avoid danger, and loud exhaust is governed by ORS 815.250.
Salem Revised Code 93.020 bars several vehicle noises per se: dynamic braking devices except to avoid imminent danger (f/e), idling engines over ten consecutive minutes audible in a dwelling 10 p.m.–7 a.m. (f), and motor-vehicle repair or testing audible in a dwelling at night (g). Marion County mirrors these in MCC 8.45.060(D), and MCC 8.45.020 lists motor-vehicle engines and exhausts as sound-producing devices. Both codes defer to state law (ORS 815.250) for exhaust noise, except an engine idling more than 15 minutes audible in a dwelling at night stays a violation (MCC 8.45.080(L)).
Vehicle-noise violations are infractions in Salem and Class A violations in the county. Loud modified exhaust is enforced under ORS 815.250.
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