Whenever a usable path for bicycles has been provided adjacent to a roadway, bicycle riders shall use such path and shall not use the roadway. The City shall permit individuals with mobility disabilities to use wheelchairs and manually powered mobility aids, such as walkers, crutches, canes, braces, or other similar devices designed for use by individuals with mobility disabilities in any area open to pedestrian use, including bicycle paths. The City shall also permit the use of other power-driven mobility devices by individuals with mobility disabilities, unless it is demonstrated that the class of power-driven mobility devices cannot be operated in accordance with legitimate safety requirements that the City has adopted in accordance with the Americans with Disabilities Act Part 35.
(Code of Iowa, Sec. 321.236[10])