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|direction_b=East |terminus_b= at Indiana state line |previous_route=89 |previous_type=IL |next_route=90 |next_type=IL }} Interstate 90 (I-90) in the U.S. state of Illinois runs roughly northwest-to-southeast through the northern part of the state. From the Wisconsin state line at South Beloit, it heads south to Rockford before heading east-southeast to the Indiana state line at Chicago. I-90 traverses through a variety of settings, from farmland west of the Fox River Valley through the medium-density suburban west of O'Hare International Airport, through downtown Chicago, and through the heart of the industrial southeast side of Chicago before entering Indiana. I-90 comprises several named highways. The Interstate runs along the Jane Addams Memorial Tollway from South Beloit to O'Hare Airport, the Kennedy Expressway runs from O'Hare to the Chicago Loop, the Dan Ryan Expressway from the Loop to the Chicago Skyway, and the Skyway to the Indiana state line. The Jane Addams and Chicago Skyway are toll roads maintained by the Illinois State Toll Highway Authority and Skyway Concession Company, respectively. The remainder of the highway is maintained by the Illinois Department of Transportation. The Chicago Skyway, also known as Chicago Skyway Toll Bridge System, is a toll road in Chicago carrying I-90 from the Indiana Toll Road to the Dan Ryan Expressway on Chicago's South Side. The main feature of the Skyway is a steel truss bridge, known as the "High Bridge". The toll bridge spans the Calumet River and Calumet Harbor, a major harbor for industrial ships. The main span is long, provides for of vertical clearance, and is the highest road in Chicago. The Jane Addams Tollway was built in the late 1950s and early 1960s as the Northwest Tollway. It was renamed in 2007 after Jane Addams, the Nobel laureate and founder of the Settlement House movement in the United States. Between 2001 and 2004, authorities spent $250 million to rebuild much of the Chicago Skyway. ==Route description== Interstate 90 enters from Beloit, Wisconsin with I-39. At the Rockton Road exit, I-39/90 becomes the Jane Addams Memorial Tollway. The two Interstates run south to Rockford, where I-39 continues as a freeway south to Bloomington-Normal. I-90 continues east-southeast to Belvidere and Elgin on the way through the Chicago area. In Schaumburg, I-90 meets the western end of I-290, the only loop from I-90 in Illinois. I-90 passes north of O'Hare International Airport, where I-190 branches west to the airport terminals. I-90 also meets I-294 at this junction with I-190. I-90 continues southeast as the Kennedy Expressway and is later joined with eastbound I-94; westbound I-94 runs on the Edens Expressway. I-90 and I-94 then head toward the Loop, intersecting the eastern end of I-290. South of I-290, the highway is given the name of the Dan Ryan Expressway. On Chicago's South Side, the Dan Ryan passes I-55 before I-90 splits off from I-94 and becomes the Chicago Skyway, again becoming a toll road. I-90 then runs directly southeast to the Indiana state line, and becomes the Indiana Toll Road at the state line. Often confusing to non-residents is the direction system for I-90/94, in which signs that say "I-90/94 West" go north/northwest and signs that say "I-90/94 East" go south/southeast. This naming system is due to the overall direction of the expressway. I-90/94 West goes north, splits into I-94 and I-90, continues north to Wisconsin, and then goes west, I-90 going to Seattle. I-90/94 East goes south, splitting into two pieces, and then turns northeast, I-90 ending in Boston. Historically, the Chicago Skyway was signed as, and was widely considered to be part of, I-90 from the mid-1960s forward (after I-90 in this area had been swapped with I-94). However, around 1999, the city of Chicago realized they had never received official approval to designate the Skyway as I-90. The city subsequently replaced most of the "I-90" signage with "TO I-90/I-94" signage. However, the Illinois DOT has always and continues to report the Skyway as part of the Interstate system, and the Federal Highway Administration apparently still considers the Chicago Skyway an official part of I-90. The Skyway's official name, referring to it as a "toll bridge" rather than a "toll road", is the result of a legal quirk. At the time of its construction, the city charter of Chicago did not provide the authority to construct a toll road. However, the city could build toll bridges, and it was found that there was no limit to the length of the approaches to the bridge. Therefore, the Skyway is technically a toll bridge with a six-mile-long approach. This also is part of the reason that there are no exits available until after one has crossed the bridge and paid the toll. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Interstate 90 in Illinois」の詳細全文を読む スポンサード リンク
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