  Interstate Highway shields for Interstate 69 and Interstate 465 | |
 Interstate Highways highlighted in red | |
| Highway names | |
|---|---|
| Interstates | Interstate X (I-X) |
| US Highways | U.S. Route X (US X) |
| State | State Road X (SR X) |
| System links | |
| |
Interstate Highways are owned and maintained by the Indiana Department of Transportation (INDOT) unless it is a toll road.
The system was authorized by the Federal-Aid Highway Act of 1956, which provided federal funds for construction of limited access highways. Indiana's initial set of seven Interstate Highways were announced in September 1957.[1]
- ^ Hodenfield, G. K. (September 26, 1957). "New Markers to Dot Super Roads". The Indianapolis News. p. 1. Retrieved November 28, 2021 – via Newspapers.com.