(A) No person 15 or more years of age shall ride a bicycle upon any sidewalk in any district.
(B) Whenever any person is riding a bicycle upon a sidewalk, such person shall yield the right-of- way to any pedestrians and shall give audible signals before overtaking and passing any such pedestrian.
(C) No person, regardless of age, shall at any time ride a bicycle upon any sidewalk in the business district.
(`90 Code, § 6-9) Penalty, see § 73.99