Clackamas County Code 6.05.040(B)(2) bans sounding a vehicle horn more than ten consecutive seconds except as a danger warning. On-road vehicle exhaust noise is governed statewide by ORS 815.250, enforced by the Sheriff, requiring an adequate muffler.
Under Code 6.05.040(B)(2), sounding any horn or signaling device on a vehicle for more than ten consecutive seconds is a per se violation, except as a genuine danger warning. Motor-vehicle noise on public rights of way is otherwise regulated by state law: 6.05.060(H) defers to ORS 815.250, which the Sheriff enforces. ORS 815.250 makes operating without a proper exhaust system a Class C traffic violation, with noise-emission standards of roughly 88-94 dBA depending on vehicle type. Modified or loud exhaust falls under state, not county, limits.
Excessive horn use is citable under Ch. 6.05. Illegal loud exhaust is a Class C traffic violation under ORS 815.250, enforced by the Sheriff on public roads.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Clackamas County's vehicle noise rules stack up against other locations.
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