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In the 1920s, two state highways followed the general alignment that I-80 takes. In 1932, US Route 6 (US 6) was extended through Illinois, paralleling the alignment that I-80 in Illinois takes today. Construction started in 1957, and I-80 was completed in 1968. In the early 1990s, Illinois wanted to reroute I-80 in the Quad Cities area.
Interstate 55 (I-55) is a major north–south Interstate Highway in the US state of Illinois that connects St. Louis, Missouri, to the Chicago metropolitan area.It enters the state from Missouri near East St. Louis, Illinois, and runs to U.S. Route 41 (US 41, Lake Shore Drive) near Downtown Chicago, where the highway ends, a distance of 294.38 miles (473.76 km). [2]
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).
The oldest segment of I-57 is a 6.2-mile (10.0 km) strip running east of Bradley to Kankakee labeled on the 1959 Illinois state highway map. [5] Two years later, a 33-mile (53 km) stretch of I-57 from Dongola north to Marion opened on September 26, 1961. [6]
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.
In Illinois, I-72 runs for 182 miles (293 km). The portion of I-72 and I-172 from Springfield to Quincy is commonly referred to as the Central Illinois Expressway (CIE). As of 2007, I-72 has one business route; I-72 Business (I-72 Bus.) in Jacksonville. Near Valley City at mile-marker 42 are the Valley City Eagle Bridges.
The Illinois Tollway's 2005–2012 Congestion-Relief Program provided $644.1 million (equivalent to $966 million in 2023 [6]) in projects along the I-90 corridor. [7] Projects included rebuilding and widening of the tollway between I-39 and Rockton Road, including a reconfiguration of the I-90/I-39 interchange.
Until 2010, mileposts along the Tri-State Tollway portion of I-94 reflected the distance from the southeastern terminus of the tollway, that led to a counterintuitive increase in the mile numbers as one proceeds "west". In 2010, the milemarkers were renumbered to indicate mileage of I-94 traveled in Illinois, increasing from the Wisconsin ...