There are a total of 21 Interstate Highways in Ohio, including both primary and auxiliary routes.

Ohio ranks second in the nation in terms of the number of bridges for its Interstates.

The same year, Ohio passed a law which raised the state's speed limit to 60 mph (97 km/h), and in 1957, Ohio began the construction of its Interstate Highway allotment.

By 1958, Ohio had spent more money on its Interstate Highways than either New York or California.

On September 19, 2003, Ohio finally finished the originally planned Interstate Highway System.