In unincorporated Lake County, Indiana it is unlawful for a light motor vehicle to exceed 80 dBA in 35-mph-or-less zones (measured 15+ feet from the lane), or to make excessive noise from defective or modified exhaust, rapid acceleration, engine revving or tire squealing (Code § 93.04). Indiana law (IC 9-19-8-3)
Lake County Code § 93.04 sets a numeric limit for vehicles: a light motor vehicle may not exceed 80 dBA in speed zones of 35 mph or less within the unincorporated county, with measurements taken at least 15 feet from the edge of the violator's lane of travel. It is separately unlawful to operate a light motor vehicle that causes excessive noise from a defective or modified exhaust, rapid acceleration or deceleration, engine revving, or tire squealing. This layers on top of Indiana state law: IC 9-19-8-3 requires every motor vehicle's muffler or noise-dissipative device to be in good working order and in constant operation to prevent excessive noise, and IC 9-19-8-2 bars muffler leaks, alteration or deterioration. A separate
Vehicle-noise violations of § 93.04 are punished under the general penalty § 10.99, enforced by the Lake County Police Department through Lake Superior Court, County Division. Loud car-stereo violations under § 93.08 carry their own steeper fines (up to $2,500/day).
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