Unincorporated Chatham County caps roadway vehicle noise at 55 dB. Savannah limits standard vehicles to 76 dBA at 35 mph or less (80 dBA above), and heavy trucks to 91/95 dBA, measured 25 feet from the lane.
Chatham County §11-109 prohibits any noise from a vehicle on a public roadway exceeding a maximum permissible level of 55 dB, measured with an ANSI-standard sound level meter. City of Savannah §9-2037 sets vehicle noise limits measured at least 25 feet from the nearest lane: 76 dBA at speed limits of 35 mph or less and 80 dBA above 35 mph for ordinary vehicles; heavy vehicles (GVWR/GCWR of 10,000+ pounds) are limited to 91 and 95 dBA respectively. Savannah also bars idling a heavy vehicle's engine over 20 minutes within 150 feet of residential property, and requires a working muffler with no cutout or bypass.
Misdemeanor; Savannah requires a muffler free of defects with no cutout, bypass, or similar device.
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