§ 72.19 EMERGING FROM ALLEY OR DRIVEWAY.
   The operator of a bicycle, emerging from an alley, driveway, or building, shall, upon approaching a sidewalk or the sidewalk area extending across any alleyway, yield the right-of-way to all pedestrians approaching on said sidewalk or sidewalk area and upon entering the roadway, shall yield the right-of-way to all vehicles approaching on said roadway.