307.191.  Bicycle to operate on the shoulder adjacent to roadway, when — roadway defined. — 1.  A person operating a bicycle at less than the posted speed or slower than the flow of traffic upon a street or highway may operate as described in section 307.190 or may operate on the shoulder adjacent to the roadway.

  2.  A bicycle operated on a roadway, or on the shoulder adjacent to a roadway, shall be operated in the same direction as vehicles are required to be driven upon the roadway.

  3.  For purposes of this section and section 307.190, "roadway" is defined as and means that portion of a street or highway ordinarily used for vehicular travel, exclusive of the berm or shoulder.