All roads within Pierce County shall be classified as major arterials, secondary arterials, collector arterials, local roads or primitive roads pursuant to RCW 36.86.070. All designations and classifications shall be contained in the road classification ordinance as adopted by the Pierce County Council. For the purpose of establishing design standards on local roads, the County Engineer is authorized to assign an operational classification of Local Road Feeder, Local Road Minor, Local Road Cul-de-Sac, Neighborhood Street or Access Lane.