311.04  ZONES OF QUIET.
   (a)   Whenever authorized signs are erected indicating a zone of quiet, no person operating a vehicle within any such zone shall sound the horn or other warning device of such vehicle except in an emergency.
(Ord. 1961-15.  Passed 7-3-61.)
   (b)   Whoever violates any provision of this section is guilty of a minor misdemeanor on a first offense; on a second offense within one year after the first offense, the person is guilty of a misdemeanor of the fourth degree; on each subsequent offense within one year after the first offense, the person is guilty of a misdemeanor of the third degree.