(a) To notify the public that a state highway is closed or its use restricted pursuant to this act notification shall be in one (1) or more of the following forms:
(i) Erect suitable barriers or obstructions upon such highway;
(ii) Post warnings and notices of the condition of any such highway;
(iii) Post signs for the direction of traffic upon it, or to or upon any other highway or detour open to public travel;
(iv) Place warning devices on such highway;
(v) Assign a flagman to warn, detour or direct traffic on such highway.