Indiana Code Title 9. Motor Vehicles § 9-21-8-19

Sec. 19. A person may not drive a vehicle onto or from a freeway or the interstate highway system except at entrances and exits that are established by the public authority in control of the highway.  Whenever special crossovers between the main roadways of a freeway or the interstate highway system are provided for emergency vehicles or maintenance equipment only, the freeway or interstate highway system shall be posted prohibiting “U” turns.  A person who drives a vehicle, except an emergency vehicle or maintenance equipment, may not use the crossovers or make a “U” turn anywhere on the freeway or interstate highway system.