Ind. Code § 8-6-7.7-2

Sec. 2. The Indiana department of transportation, in authorizing the construction of any new grade crossing under IC 8-6-1-7 and section 3.4 of this chapter, may order the installation of automatic train-activated warning signals at the crossing. The department may order the installation, replacement, relocation, modernization, or improvement of automatic train-activated warning signals at any grade crossing in the state in existence at the time the department issues such an order. The authority of the department to require the installation of the signals is exclusive and supersedes the power of any other state or local governmental agency.