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."