Indiana Code Title 8. Utilities and Transportation § 8-15-3-36

Sec. 36. (a) If the department, with the approval of the governor, decides to establish toll lanes, the department shall submit a request to the Federal Highway Administration for a waiver to toll lanes on interstate highways.  If a waiver is granted under this section, toll lanes may be established in accordance with this title.

(b) The first toll lanes established on an interstate highway must be located at least seventy-five (75) miles from an interstate highway or bridge on which travel is subject to tolling as of July 1, 2017.  This subsection does not apply if a waiver is applied for under subsection (a) after January 1, 2025.