None of the provisions of sections 50-1301 through 50-1325, Idaho Code, shall be construed to require replatting in any case where plats have been made and recorded in pursuance of any law heretofore in force; and all plats heretofore filed for record and not subsequently vacated are hereby declared valid, notwithstanding irregularities and omissions in manner of form of acknowledgment or certificate. Provided, however:
(1) When plats have been accepted and recorded for a period of five (5) years and said plats include public streets that were never laid out and constructed to the standards of the appropriate public highway agency, said public street may be classified as public right of way; and
(2) Public rights of way for vehicular traffic included in plats which would not conform to current highway standards of the appropriate public highway agency regarding alignments and access locations which, if developed, would result in an unsafe traffic condition, shall be modified or reconfigured in order to meet current standards before access permits to the public right of way are issued.