Running parallel to the Indiana border, it is also the longest state road, starting on the south side of Chicago as Halsted Street at an interchange with Interstate 57 (I–57), south to a free ferry crossing to Kentucky at Cave-in-Rock on the Ohio River.
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By 1964, Illinois 1 was restored to its old alignment, and Illinois Route 394 was applied to the expressway south of the portion designated as Interstate 94 (the I-94 portion now being known as the Bishop Ford Freeway).
Illinois Route 394 is a four-lane state freeway that travels south from Thornton at the Interstate 294/Interstate 94/Interstate 80 (Tri-State Tollway/Bishop Ford Freeway; this route is an extension of the latter freeway) interchange to Illinois Route 1 south of Steger and Crete.
In Iroquois County, most of a cattle building was blown into a field just west of Illinois Route 1 near Milford.
Illinois | University of Illinois at Urbana-Champaign | Peoria, Illinois | Rockford, Illinois | Evanston, Illinois | Springfield, Illinois | Northern Illinois University | Cook County, Illinois | U.S. Route 66 | U.S. Route 1 | Illinois Institute of Technology | Joliet, Illinois | U.S. Route 6 | U.S. Route 101 | Route 66 | Rock Island, Illinois | Belleville, Illinois | Aurora, Illinois | U.S. Route 30 | Southern Illinois University | Quincy, Illinois | New Jersey Route 4 | Illinois River | European route E65 | U.S. Route 40 | Governor of Illinois | California State Route 1 | Wheaton, Illinois | Waukegan, Illinois | Naperville, Illinois |