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 such sidewalk or sidewalk area, and upon entering the roadway shall yield the right-of-way to all vehicles approaching on such roadway.
('84 Code, § 16-80) Penalty, see § 10.99