 With the newly opened Indiana Toll Road, the Skyway and Toll Road became part of a second coast-to-coast Interstate highway, as Interstate 90 ran through the city of Chicago proper.The Skyway-Indiana Toll Road combination paralleled the shoreline of Lake Michigan, and was a popular road until the Dan Ryan Expressway opened in 1962, with Interstate 80/94 providing a free route from Chicago to northwestern Indiana.Ideas for an east-west limited access highway further south, connecting southern Lake County Indiana with Will County Illinois, have been studied by transportation planners in efforts prior to the current Illiana Corridor Study, notably by the following