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Expressway information is grouped according to travel direction through the
Chicago area from the Loop (downtown), or from the city limits if a route does
not originate in the Loop. This provides a general sense of navigation, but it
violates the laws of expressway numbering. For example, I-90/94 is designated as
an east-west route, but in Chicago it's actually a due south route. Chicagoans
usually speak of heading south on the Dan Ryan, not "west".
Trivia: What was the first expressway in Chicagoland? It was just 5
miles long, and when it opened November 1, 1950 it was called the Calumet
Expressway and Tri-State Highway. The road stretched from 159th Street to the
Indiana state line. It is now part of the Bishop Ford and Kingery expressways.
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