Stevenson Expressway

Interstate 55
Route information
Maintained by IDOT
Length:	294.38 mi (473.76 km)
Major junctions
South end:	I-55 / I-64 / US 40 at East St. Louis
	I-64 / I-70 / IL 3 in East St. Louis I-255 in Collinsville I-70 / I-270 / US 40 in Troy I-72 / US 36 / I-55 Bus. in Springfield I-155 near Lincoln I-74 in Bloomington I-39 / US 51 in Normal I-80 in Joliet I-355 in Bolingbrook I-294 in Indian Head Park I-90 / I-94 in Chicago
North end:	US 41 in Chicago
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Illinois State Highway System Interstate U.S. State Tollways ← IL 54 IL 56 →

Interstate 55 Business
Location:	Springfield

Interstate 55 Business
Location:	Lincoln

Interstate 55 Business
Location:	Bloomington–Normal

Interstate 55 (I-55) is a major north–south Interstate Highway in the U.S. state of Illinois that connects the St. Louis, Missouri, and Chicago metropolitan areas. It enters the state from Missouri on the Poplar Street Bridge near East St. Louis and runs to U.S. Route 41 (US 41, Lake Shore Drive) near downtown Chicago where the highway ends, a distance of 294.38 miles (473.76 km). The Road also runs through the cities of Springfield, Bloomington, and Joliet. The section in DuPage County is officially named Joliet Freeway or Will Rogers Freeway and in Cook County is officially named the Stevenson Expressway.

I-55 within Illinois carries heavy traffic, with an average of more than 20,000 vehicles per day for most of its length. Significant portions of I-55 contain six lanes (three lanes in each direction) and are heavily used by commuters. I-55 in Illinois begins in East St. Louis on the Poplar Street Bridge over the Mississippi River at the Missouri–Illinois state line and runs southwest to northeast through the state, ending in Chicago at US 41 (Lake Shore Drive). Along the way, it goes through four metropolitan areas in the state: the Illinois portion of the St. Louis metropolitan area, the Springfield metropolitan area, the Bloomington-Normal metropolitan area, and the Chicago metropolitan area (also known as Chicagoland).

...
Wikipedia