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Interstate 270 (I-270) makes up a large portion of the outer belt freeway in the St. Louis, Missouri metropolitan area. The counterclockwise terminus of I-270 is at the junction with I-55 in Mehlville, Missouri; the clockwise terminus of the freeway is at the junction with I-55 and I-70 north of Troy, Illinois. The entire stretch of I-270 is . I-270 between I-70 and I-55 was formerly designated I-244, a western bypass of St. Louis, Missouri. It was originally proposed by Missouri as I-144, but the road was a beltway (or part of one), so the American Association of State Highway and Transportation Officials (AASHTO) assigned it the number I-244. By the late 1970s, the entire beltway (including today's I-255) was integrated as a part of I-270 for consistency. However, the politicians in Illinois started planning their supplemental freeway system in the mid-1970s and a section of Corridor 413 was included into the Interstate Highway System in April 1978. This caused a potential place of confusion in Pontoon Beach, Illinois where I-270 would have intersected itself, and eventually the Illinois Department of Transportation (IDOT) decided on the I-255 numbering in 1980 (but not before considering renumbering an section to I-870). ==History== The section of I-270 on the Missouri side was completed by June 1964, while the section that was I-244 was completed by November 1968. The section from Illinois Route 3 (IL 3) to I-55 in Illinois was finished by May 1965. During the Great Flood of 1993, the New Chain of Rocks Bridge carrying I-270 over the Mississippi River was the only bridge open from St. Louis to Keokuk, Iowa, at one point. (All other bridges from the McKinley Bridge to the Keokuk Bridge were closed at the peak of that flood.) The last major construction project on I-270 occurred from 1995 to 1998. Both the Missouri Department of Transportation (MoDOT) and IDOT upgraded I-270 to modern standards from Lilac Avenue to I-255. However, this section of I-270 is still at two lanes in each direction. On September 13, 1999, a fatal accident involving a tractor-trailer occurred in the westbound lanes of I-270 in front of the now-defunct St. Thomas Aquinas-Mercy High School (now North County Christian School) in North St. Louis County. This accident sped up efforts that led to the I-170/I-270 interchange reconstruction that went from 2001 to 2004. A major accident and fire from a FedEx Ground truck between the Route 367 and Lilac Avenue exits on October 28, 2002, forced detours and lengthy delays. There were plans to sign an section of I-270 from Glen Carbon to Edwardsville as I-870. However, this idea was discarded. In 2008, MODOT implemented new variable speed limits on I-270/I-255 with the normal limit being . However, due to complaints from the public, these signs were planned to be updated in 2011 to advisory signs. 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 270 (Illinois–Missouri)」の詳細全文を読む スポンサード リンク
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