INDOT marked its 100th anniversary in July 2019, a milestone that celebrated the awarding of the first state highway contracts by the Indiana State Highway Commission, the predecessor to the Indiana Department of Transportation.
Over the past 100 years, INDOT and its predecessors have been responsible for building, maintaining and operating interstate highways, U.S. routes, and state roads, including adjacent overpasses and ramps, traffic control devices, and signs and traffic signals, within the state of Indiana. State roadway maps have tracked the growth of Indiana’s road network over the last century.
- 1919 State Highway System Map
- 1926 ISHC Highway Map
- 1932 ISHC Highway Map
- 1940 ISHC Highway Map
- 1945 ISHC Highway Map
- 1950 ISHC Highway Map
- 1960 ISHC Highway Map
- 1970 ISHC Highway Map
- 1980 ISHC Highway Map
- 1990 INDOT Highway Map
- 2000 Indiana Transportation Map
- 2010 Indiana Transportation Map