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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]
IL 1 was posted on what is now IL 394 from 1957 to 1964, the old road was Alt. IL 1 during that time IL 2: 73.91: 118.95 IL 40 in Sterling: WIS 213 in South Beloit: 1918: current Originally Rockford to Dixon to Mendota to Cairo; replaced by US 51 south of Mendota IL 3: 187.44: 301.66 US 51/IL 37 in Cairo: IL 100 in Grafton: 1918: current
The pavement condition index (PCI) is a numerical index between 0 and 100, which is used to indicate the general condition of a pavement section.The PCI is widely used in transportation civil engineering [1] and asset management, and many municipalities use it to measure the performance of their road infrastructure and their levels of service. [2]
At around 10:00 p.m. on November 11, a group of Illinois State Police vehicles and tollway maintenance vehicles escorted the first motorists southbound along the I-355 extension, stopping at each interchange to remove barricades. By the time the maintenance crews began to remove barricades along the northbound lanes of the extension, a group of ...
The last county, Ford County, was created by the Illinois government in 1859. Cook County, established in 1831 and named for the early Illinois Attorney General Daniel Pope Cook, contained the absolute majority of the state's population in the first half of the 20th century and retains more than 40% of it as of the 2020 census.
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Overall map of system: freeways in light blue, tollways in green, ... 26, and 29 are found in north-central Illinois, while routes 53, 56, 58, 59, 60, 62, 64, 68 and ...
name = Illinois Name used in the default map caption; image = USA Illinois location map.svg The default map image, without "Image:" or "File:" image1 = USA Illinois relief location map.svg An alternative map image, usually a relief map, which can be displayed via the relief or AlternativeMap parameters; top = 42.7 Latitude at top edge of map ...