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Interstate 255 (I-255) is a bypass route of Interstate 55 near St. Louis, Missouri and with Interstate 270, it forms a loop around the city. Even though St. Louis is in Missouri, a majority of the route runs through Illinois. It shares its southern terminus with 270 at the junction with Interstate 55, 270 goes to the west and 255 goes to the east. US 50 joins I-255 at Lemay Ferry Road. It crosses the Mississippi River on the Jefferson Barracks Bridge, enters Illinois, and then turns north. There is a junction with Interstate 64, where US-50 breaks off and goes east, and then further north there is a junction with Interstate 55 again, Interstate 70, and U.S. Route 40, all of which are all co-signed together. The next junction is another one with Interstate 270, and it is the northern terminus of Interstate 255. After that, it becomes Illinois Route 255. Interstate 255 is in length.〔 ==History== I-255 route was proposed from I-55/I-244 near Green Park to I-55/70 west of Cahokia Mounds〔(1970 USGS Topo Map )〕 near the intersection with IL 111 when plans surfaced in the 1950s Yellow Book. It was originally designed to be a four lane highway but was changed to six lanes.〔Alton Telegraph, April 29, 1977〕 Since that routing was to go through the American Bottoms, archaeological investigations had to be conducted prior to any construction, which would later become known as the (FAI 270 Series ). When Cahokia Mounds was designated in the federal register, an alternative alignment for I-255 from I-64 to I-55/70 was selected.〔Edwardsville Intelligencer, July 9, 1973〕 This delayed construction of I-255 until the late 1970s, making it the last interstate highway in metropolitan St. Louis to be built. Both the western (I-270) and eastern (I-255) portions of the interstate loop around St. Louis were originally designated as I-270. However, the route that Illinois selected ("Corridor 413"〔(Illinois Supplemental Freeway )〕) included an interchange in Pontoon Beach between the new beltway (running north and south parallel to the Mississippi River) and the existing beltway (running east and west to a terminus at I-55/I-70). As such, two intersecting interstate highways would have carried the same route number.〔IDOT FAI-270/FAP 413 Draft EIS Volume 1, 1983〕 As such, Illinois' Department of Transportation (IDOT) concluded a different route number would be necessary for the eastern leg of the beltway. While I-870 was initially considered,〔(I-270/870 proposed routes )〕 informal use of I-255 in contemporary local media coverage led to its widespread adoption. By 1980, IDOT announced that the eastern portion of the St. Louis beltway was to be designated as I-255. 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 255」の詳細全文を読む スポンサード リンク
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