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Interstate Highways are owned and maintained by the Indiana Department of Transportation (INDOT) unless it is a toll road. The system was authorized by the Federal-Aid Highway Act of 1956, which provided federal funds for construction of limited access highways. Indiana's initial set of seven Interstate Highways were announced in September 1957 ...
The Illinois Department of Transportation (IDOT), Illinois State Toll Highway Authority (ISTHA), and Skyway Concession Company (SCC) are responsible for maintaining these highways in Illinois. 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]
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
Grand Army of the Republic Highway [2] US 12: 46.258: 74.445 US 12/US 20/US 41 at Whiting: US 12 at Michiana Shores: 1926 [3] current Iron Brigade Highway [4] US 20: 155.734: 250.630 US 12/US 20/US 41 at Whiting: US 20 near Angola: 1926 [5] current US 24: 166.846: 268.513 US 24/US 52 near Kentland: US 24 near Fort Wayne: 1926 [5] current
SBI # 1 paid for Route 1, and so on. These initial 46 route numbers marked the major infrastructure roads desired by the state legislature in 1918. Remarkably, many of these numbers still exist on the original or nearby alignment. As the highway system grew these numbers were altered to accommodate new roads or extensions of older roads.
There is no rule preventing the same numbering between state roads, U.S. routes, and Interstate highways, although traditionally, INDOT has avoided state road numbers which are the same as those on U.S. routes within the state. Indiana has a mileage cap of 12,000 miles (19,000 km) for its highway system. [1]
These highways are maintained by the Illinois Department of Transportation (IDOT), with the exception of Illinois Route 390 and parts of Illinois Route 56 and Illinois Route 110, which are maintained by the Illinois State Toll Highway Authority (ISTHA), and all routes that enter the Chicago City Limits are maintained by the Chicago Department ...
U.S. Route 12 (US 12) in the U.S. state of Illinois is an arterial highway that runs northwest to southeast through the Chicago metropolitan area.It enters Illinois at the Wisconsin border north of Richmond, and exits into Hammond, Indiana, from Chicago near the foot of the onramp to the Indiana Toll Road (Interstate 90, or I-90); as it exits Illinois, the route is also concurrent with US 20 ...