Ind. Code § 8-23-9-40

Sec. 40. Whenever a state highway is being constructed or reconstructed and the highway crosses or intersects a railroad, the department may, if in its opinion it is practicable, separate grades at the crossings. If the department is unable to agree with the railroad as to the separation and the method of accomplishing the separation, the department shall apply to the utility regulatory commission by verified petition asking that the grades be separated at the crossing.