The transportation commission may, by rule adopted pursuant to chapter 1-26 , and local authorities may by ordinance, with respect to any controlled - access roadway under their respective jurisdictions, prohibit the use of any such roadway by pedestrians, bicycles, or other nonmotorized traffic or by any person operating a motor - driven cycle. The Department of Transportation or the local authority adopting any such prohibitory regulation shall erect and maintain official signs on the controlled - access roadway on which such regulations are applicable. If so erected no person may disobey the restrictions stated on such signs. The violation for failure to obey a regulatory sign under this section is a Class 2 misdemeanor. Source: SL 1961, ch 150 , § 3; SL 1987, ch 210 , § 35; SL 1989, ch 255 , §§ 163, 182.