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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).
Illinois's state route numbers originated in 1918 as State Bond Issues 1 through 46, used to finance the new roads. The numbers of the bond issues were then used to mark the highway routes along the way. Another series of bond issues were authorized in 1924 (47–185) and again were used to mark the roads they paid for.
Illinois Route 72 cross-sign mounted on a stoplight in Hoffman Estates. SBI Numbers are still used for several purposes, even when they do not match the posted number. IDOT District maps still refer to SBI numbers on the various roads it maintains, along with other non-posted designations that refer to how the route was authorized.
This is a list of U.S. Highways in Illinois, all of which are owned and maintained by the U.S. state of Illinois. The Illinois Department of Transportation (IDOT) is responsible for maintaining the U.S Highways in Illinois. The system in Illinois consists of 20 primary highways.
US 150 west / IL 116 east / Illinois River Road north – Peoria, Metamora: Eastern end of US 150/IL 116/Illinois River Road overlap; grade-separated interchange: Washington Township: 141.5: 227.7: US 24 Bus. east / IL 8 west – East Peoria, Washington: Woodford: Cruger Township: 149.4: 240.4: US 24 Bus. west / Ronald Reagan Trail
Illinois Route 60 (IL 60) is a 17.22-mile-long (27.71 km) east–west state highway in Lake County, in northeastern Illinois. It connects the village of Volo at Illinois Route 120 (Belvidere Road) just east of Illinois Route 59 with the city of Lake Forest at U.S. Highway 41 (Skokie Highway).
Interstate 70 (I-70) is a part of the Interstate Highway System that travels from Cove Fort, Utah, to Baltimore, Maryland.In the US state of Illinois, the highway travels 160 miles (260 km) from the Missouri state line at the Mississippi River in Brooklyn east to the Indiana state line near Marshall.
U.S. Route 30 (US 30) is an east–west arterial surface road in northern Illinois. It runs from across the Mississippi River from Clinton, Iowa , to Lynwood at the Indiana state line. This is a distance of 153.79 miles (247.50 km).