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 the sidewalk or sidewalk area, and upon entering the roadway shall yield the right-of-way to all vehicles approaching the roadway.
(‘85 Code, § 10.14) Penalty, see § 73.99