373.14 RIDING ON SIDEWALKS.

   (a)   No person shall ride a bicycle upon a sidewalk within a business district where there is less than twenty feet between the front of the business building and the back of the near curb.

   (b)   Minors fifteen years of age or less may be permitted to ride bicycles on sidewalks where the buildings do not abut the paved parts of the sidewalks; provided that, when approaching a pedestrian or other person lawfully using the sidewalk, any minor riding on the sidewalk shall give audible warning by means of a bell or horn and shall yield the use of the sidewalk to the pedestrian or other person dismounting if necessary to do so.

   (c)   The Chief of Police is authorized to erect signs on any sidewalk or roadway prohibiting the riding of bicycles thereon by any person, and when the signs are in place no person shall disobey them.

   (d)   No person shall ride a motorized bicycle on a sidewalk, unless directed to do so by sign or signal or at the direction of a police officer.

   (e)   Whoever violates 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.