§ 70.21 ZONES OF QUIET; SCHOOL ZONES.
   (A)   Whenever authorized signs are placed indicating a zone of quiet, the person operating a motor vehicle within the zone shall not sound the horn or any other warning device, except in an emergency.
   (B)   Whenever authorized signs are placed designating any street or part thereof as a school zone, drivers of motor vehicles using the street shall exercise the greatest care for protection of children.