Indiana Code Title 8. Utilities and Transportation § 8-15.7-3-2

Sec. 2. An operator has:

Tolls or user fees may not be imposed by the operator except as set forth in a public-private agreement.  User fees and the setting of user fee rates are not subject to supervision or regulation by any commission, board, bureau, or agency of the state or any municipality, other than the department to the extent set forth in the public-private agreement.