Massachusetts · Massachusetts General Laws — Part I, Title XIV, Motor Vehicles
Mass. Gen. Laws (Motor Vehicles) § 90:7E: Display of red or blue lights on vehicles; permits; revocation; violations
What this law says, in plain English
Motor vehicles may not display flashing red lights unless authorized by law. Certain fire and emergency personnel may display red lights only when responding to emergencies and only with a permit from the registrar.
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