(A) It shall be permissible for any person to ride a bicycle upon any sidewalk within a residential district. Bicycle riders shall at all times yield the right-of-way to pedestrians and shall give pedestrians audible warning by signal before overtaking and passing them. No person shall ride a bicycle upon a sidewalk within any business district.
(B) No person shall ride a bicycle on a sidewalk or within a roadway where official regulatory signs are placed prohibiting such riding.
(C) Any person riding a bicycle on the sidewalk shall come to a complete stop and give the right-of- way to all vehicular traffic before entering the roadway.
(`81 Code, § 73.13) Penalty, see § 70.99