Ind. Code § 8-17-1-45
(b) The county executives of two (2) adjoining counties may enter into an agreement under IC 36-1-7 for the construction, reconstruction, maintenance, or operation of any road or part of a road that makes up the boundary between the two (2) counties. In addition to the requirements of IC 36-1-7-3 , an agreement under this section must provide for the following:
(4) Any other terms the counties consider necessary.
Formerly: Acts 1971, P.L.102, SEC.1. As amended by P.L.86-1988, SEC.105; P.L.113-1989, SEC.8; P.L.84-1991, SEC.1; P.L.98-2000, SEC.7.