A. 
All of the territory within 200 feet of the premises of each hospital of this Town is hereby created and established as a zone of quiet. The Chief of Police is hereby authorized to erect and maintain in a conspicuous manner within this area such signs and markings as are necessary to designate it as a zone of quiet.
B. 
The Chief of Police may temporarily establish a zone of quiet upon any street where a person is seriously ill, if requested to do so by the written statement of at least one registered physician certifying to its necessity. Said temporary zone of quiet shall embrace all territory within a radius of 200 feet of the building occupied by the person named in the request of said physician. Said temporary zones of quiet shall be designated by the police by placing at a conspicuous place in the street a sign or marker bearing the words "Zone of Quiet."
C. 
No person operating a motor vehicle within any designated and signed zone of quiet shall sound the horn or other warning device of said vehicle except in an emergency.
D. 
Idling. Massachusetts General Laws Chapter 90, § 16A, states that: "No person shall cause, suffer, allow or permit the unnecessary operation of the engine of a motor vehicle while said vehicle is stopped for a foreseeable period of time in excess of five minutes."