It shall be unlawful for any person to operate recreational wheels on sidewalks within the business district area starting at Billings Avenue through Montgomery Avenue on First Street. To include all avenues between Railroad Street and Second Street that fall within those business district boundaries. Also to include the south half of the 300 Block of Pennsylvania Avenue, the area between the fire department and the city library; provided however, this prohibition shall not apply to any law enforcement officer or public works employee operating a bicycle in his or her official capacity. This prohibition on the operation of recreational wheels shall include the sidewalks on either side of the streets and avenues identified above as constituting the boundaries of the downtown business area. This provision shall not apply to wheelchairs or other ADA compliant devices being utilized by a person with temporary or permanent disabilities. The city shall post and maintain signs, at those locations affected by this chapter, notifying the public of the prohibitions contained herein.