No person shall knowingly use the roads or walks of the Evergreen State Fairgrounds in such a manner as to hinder or obstruct their proper use. No person shall knowingly interfere with the free flow of persons or vehicles upon or through the fairgrounds or otherwise knowingly prevent the orderly and efficient use of county property for its primary purpose. (Added by Res. adopted Aug. 24, 1977; Amended by Ord. 89-029 § 23, May 17, 1989).