The driver of a vehicle within a business or residence district emerging from an alley, driveway or building shall stop such vehicle immediately prior to driving onto a sidewalk or onto the sidewalk area extending across any alleyway or driveway, yielding the right-or-way to any pedestrian as may be necessary to avoid collision, and upon entering the roadway, shall yield the right-of-way to all vehicles approaching on such roadway.
('84 Code, § 16-39)