Massachusetts · Massachusetts General Laws — Part I, Title XIV, Motor Vehicles
Mass. Gen. Laws (Motor Vehicles) § 90:7U: Motorcycles; maximum sound levels
What this law says, in plain English
Motorcycles must not exceed specified noise levels: 82 decibels in speed zones ≤45 mph or 86 decibels in zones >45 mph (measured at 50 feet); off-highway motorcycles must not exceed 103 decibels (measured at 20 inches).
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