Interstate Highways The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, is a network of controlled-access highways that forms part of the National Highway System in the United States. T ...

are owned and maintained by 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.

Primary Interstates

Auxiliary Interstates

References

{{DEFAULTSORT:Interstate Highways in Indiana Interstate Highways in Indiana Lists of roads in Indiana