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(a) Every motor vehicle shall be equipped with a horn or other instrument capable of giving audible and sufficient warning of its approach. No warning device on a private motor vehicle except those private vehicles which may be designated by the Director of Motor Vehicles for emergency purposes as authorized by section 495a(c) of this title shall be a siren or simulate the sound of a siren. Warning devices shall be used to warn traffic, and they shall not be sounded between midnight and daybreak except in case of emergency.
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(b) Each motor vehicle shall be equipped with a muffler, and the use of a muffler cut-out, the unnecessary racing of engines, the making of unreasonable noise or permitting the escape of an unreasonable amount of smoke in the town limits is prohibited.