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The Illinois Routes are the highways in the State Highway System of the U.S. state of Illinois that are not simultaneously part of the Interstate Highway System or the United States Numbered Highway System. These highways are maintained by the Illinois Department of Transportation (IDOT), with the exception of Illinois Route 390 and parts of ...
The Interstate Highway System in Illinois consists of 13 primary highways and 11 auxiliary highways which cover 2,248.93 miles (3,619.30 km). [2] The Interstate Highway with the longest section in Illinois is Interstate 57 at 358.57 miles (577.06 km); the shortest is Interstate 41 at 0.90 miles (1.45 km).
As the highway system grew these numbers were altered to accommodate new roads or extensions of older roads. In 1924, additional State Bond Issues were authorized for SBI Routes 47 through 185. These route numbers were originally assigned and grouped to specific regions of the state.
Ronald Reagan Highway / Northwest Highway US 20: 233.93: 376.47 US 20 in East Dubuque: US 12/US 20/US 41 in Chicago: 1926: current Ulysses S. Grant Memorial Highway US 24: 255.13: 410.59 US 24 in Quincy: US 24/US 52 in Sheldon: 1926: current US 30: 153.79: 247.50 US 30 in Fulton: US 30 in Lynwood: 1926: current US 32 — — US 6 at Moline
Despite the highway's rural routing, it has junctions into four Interstates: Interstate 155 (I-155), I-55, I-74, and I-57. Additionally, US 136 contains what is perhaps one of the longest straight stretches of a U.S. Highway east of the Mississippi River, running nearly 86 miles (138 km) without any deviations from north of Easton to just west ...
Illinois Route 35 (IL 35) is a 2.42-mile-long (3.89 km) [1] connector road between U.S. Route 20 (US 20) in East Dubuque and Highway 35 at the Wisconsin state line. It is currently the shortest state highway in Illinois, [ 3 ] a stark contrast to the highway north of the state line, which is Wisconsin's longest highway.
Illinois 76 is an undivided two-lane rural highway for its entire length. Starting in US 20 Bus. in Belvidere, IL 76 travels north. It then intersects Illinois Route 173 near Poplar Grove. At the Wisconsin state line, IL 76 curves west. As soon as the road curves north, it enters Wisconsin. At that point, the road becomes WIS 140. [3]
Illinois Route 121 (IL 121) is a 109.48-mile-long (176.19 km) major state highway in the central part of the U.S. state of Illinois. Although it travels from northwest to southeast, it is marked as a north–south highway. [ 3 ]