Indiana Code Title 10. Public Safety § 10-14-3-20

(1) formulate and execute plans and regulations for the control of traffic in order to provide for the rapid and safe movement of evacuation over public highways and streets of:

for national defense or for use in any defense industry;  and

(2) coordinate the activities of the departments or agencies of the state and political subdivisions of the state concerned directly or indirectly with public highways and streets in a manner that will best effectuate the plans.