(a) All public highways, roads, and streets in Arkansas are designated in accordance with the findings of the functional classification study conducted in 1968 and 1970 and identified by maps on file in the office of the State Highway Commission and the offices of the county road and municipal street administrative officials.
(b) Recommended uniform design standards shall be established for the improvement of each functional class.
(c) The functional classification of public highways, roads, and streets shall be examined and reviewed at least every five (5) years by the commission in cooperation with the local governments.
(d) Revisions shall be made as are found in accordance with the criteria governing functional classification.