Interstate 94 in Illinois partially coincident with Tri-State Tollway
Wisconsin to Downtown Chicago
I-94 traverses rural and suburban areas in Lake County and the length of the city of Chicago, running just west of the Chicago Loop on the Kennedy Expressway, and serves Six Flags Great America, the Gurnee Mills mall, extensive office developments and residential districts in southern Lake County and the North Shore region of Cook County, and Westfield Old Orchard.
Entering Illinois from Wisconsin, I-94 becomes the Tri-State Tollway just after exit 1B (Skokie Highway), with eight lanes (four in each direction), until just north of Deerfield Road where it widens further to 10 lanes as it approaches I-294 and the Edens Spur. This is where three lanes for the Tri-State Tollway branch off and begin I-294 while two lanes for I-94 head east onto the Edens Spur which only has four lanes total (two in each direction).
The highway turns south and widens back to six lanes as it merges with US Route 41 (US 41) and becomes the Edens Expressway, and then widens to 10 lanes (four lanes in each direction plus two reversible lanes) along the Kennedy Expressway. At Ohio Street, the reversible lanes terminate and the highway has 10 lanes to the Jane Byrne Interchange, where the left lane ends and the right lane exits onto the Eisenhower Expressway (I-290).
Until 2010, mileposts along the Tri-State Tollway portion of I-94 reflected the distance from the southeastern terminus of the tollway, that led to a counterintuitive increase in the mile numbers as one proceeds "west". In 2010, the milemarkers were renumbered to indicate mileage of I-94 traveled in Illinois, increasing from the Wisconsin border to the Indiana border.Downtown Chicago to Indiana
South of Downtown Chicago, I-94 serves the southeast suburbs of Chicago, including Dolton, Calumet City, and South Holland, until it joins I-80 on the Kingery Expressway, which finally enters Indiana east of Lansing, Illinois.
I-94 has 10 lanes (five in each direction) from the exit ramps of the Jane Byrne Interchange to the Stevenson Expressway (I-55). It then splits into a 14-lane freeway on the Dan Ryan Expressway, with three and four lanes alternating between the local and express lanes in both directions. At the Chicago Skyway, a two-lane ramp carries traffic to I-90, leaving 10 lanes (five in each direction) running south to the I-57/I-94 junction.
From I-57, where I-94 is called the Bishop Ford Freeway, to Cottage Grove Avenue, the route has four lanes (two lanes each way), with six lanes (three lanes each way) between Michigan and Cottage Grove avenues. The freeway connection ramp to Stony Island Avenue has four lanes (two in each direction). I-94 then has six lanes (three in each direction) south to I-80, where it departs the Bishop Ford Freeway (which continues south as Illinois Route 394 [IL 394]) for the Kingery Expressway. On these ramps to and from I-80, I-94 has two lanes in each direction. On the Kingery Expressway itself, the combined I-80/I-94 route widens to eight lanes (four in each direction) to the Indiana state line.
The section including the Southland Interchange with I-80 and I-294 was reconfigured as part of the Kingery Expressway reconstruction project, completed in 2007, including four lanes south of 159th Street, with the split between I-80 and I-94 east to the left, and I-80 west, I-294 north, and IL 394 south on the right located north of the 170th Street overpass. The configuration of I-80 and I-94 is discussed in connection with the Kingery Expressway.
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