(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.
(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.