The operator of a bicycle emerging from an alley or driveway shall, upon approaching a sidewalk or sidewalk area extending across the alley or driveway, yield the right-of-way to all pedestrians approaching on the sidewalk or sidewalk area. Upon entering the roadway, the bicycle operator shall yield the right-of-way to all vehicles approaching on the roadways.
(`83 Code, § 15-1107) Penalty, see § 73.99