The following shall apply to riding bicycles on sidewalks:
1. Bicycles may be operated upon the public sidewalks in a careful and prudent manner, except where signs are erected prohibiting riding on designated sidewalks. Every person lawfully operating a bicycle upon a public sidewalk shall yield the right-of-way when approaching a pedestrian and shall give an audible signal before overtaking and passing.
2. Other Locations. When signs are erected on any sidewalk or roadway prohibiting the riding of bicycles thereon by any person, no person shall disobey the signs.
(Code of Iowa, Sec. 321.236[10])
3. Yield Right-of-Way. Whenever any person is riding a bicycle upon a sidewalk, such person shall yield the right-of-way to any pedestrian and shall give audible signal before overtaking and passing.
(Code of Iowa, Sec. 321.236[10])