Illinois Route 1

Illinois Route 1
Route information
Maintained by IDOT
Length:	323.06 mi (519.91 km)
Existed:	1918 – present
Major junctions
South end:	KY 91 in Cave-in-Rock
	US 45 in Norris City I-64 in Grayville US 50 in Lawrenceville I-70 in Marshall US 36 in Chrisman I-74 in Danville US 24 in Watseka US 52 in Martinton I-80 / I-294 in East Hazel Crest US 6 in Harvey I-57 / I-94 in Chicago
North end:	US 12 / US 20 in Chicago
Location
Counties:	Clark, Cook, Crawford, Edgar, Edwards, Gallatin, Hardin, Iroquois, Kankakee, Lawrence, Vermilion, Wabash, White, Will
Highway system
Illinois State Highway System Interstate U.S. State Tollways ← I-490 IL 2 →

Illinois Route 1 (IL 1) is a state highway in the U.S. state of Illinois. 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 intersection with U.S. Route 12 and U.S. Route 20 (95th Street), south to a free ferry crossing to Kentucky at Cave-in-Rock on the Ohio River. This is a distance of 325.59 miles (523.99 km).

Illinois 1 starts in the river village of Cave-In-Rock, on the Ohio River. It passes through the hills of Southern Illinois, and junctions at US 45 in Norris City. From there, it continues northeast through Carmi, Grayville, and Mount Carmel, and makes another direction change to the north. After passing through Lawrenceville, Illinois 1 does not pass through many towns for the next 50 miles until it reaches Marshall, although it does come close to Robinson. The road then runs through Paris, where it begins a multiplex with US 150. At Danville, US 150 splits off towards Champaign and US 136 follows Illinois 1 north for about 12 miles. Illinois 1 is more of a major route north of Danville, since it connects Danville with the Chicago area. Illinois 1 runs in a relatively north direction north of Danville, passing through Hoopeston and Watseka before reaching the outskirts of Kankakee. Illinois 1 then zigzags through Momence and Grant Park along with Illinois 17. At Goodenow, a lot of traffic merges onto Illinois 394, while most of the local traffic stays on Illinois 1. Illinois 394 eventually turns into I-94 in the southern suburbs. From Goodenow, Illinois 1 runs through numerous Chicago suburbs such as Chicago Heights and Harvey before ending at US 12 and US 20 on Chicago's south side.

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Wikipedia