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Interstate 129
Interstate 129 (I-129) is an auxiliary Interstate Highway which connects South Sioux City to Interstate 29 in Sioux City, Iowa. Opened in 1976, I-129 is a route, running in Nebraska. At , Interstate 129 is the shortest highway in the state of Iowa. A rare characteristic of I-129 is that it is one of only four Interstates to enter a state that its parent does not enter (I-29, in this case, does not enter Nebraska). The other three are I-275 around Cincinnati, Ohio since I-75 does not enter Indiana, I-287 around New York City because I-87 does not enter New Jersey, and I-535 because I-35 (located in the Duluth-Superior area) does not enter Wisconsin.
==Route description==
Interstate 129 begins along U.S. Route 20 on the western edge of South Sioux City, Nebraska, just west of exit 1, a cloverleaf interchange with U.S. Route 75 and U.S. Route 77. US 77 travels north through South Sioux City before ending at Interstate 29 in Sioux City while US 75 joins I-129 and US 20. One mile (1.6 km) later, I-129 / US 20 / US 75 intersect Dakota Avenue at a partial cloverleaf interchange.〔 U.S. Route 20 Business is designated along Dakota Avenue.
East of Dakota Avenue, I-129 / US 20 / US 75 travels south of South Sioux City and passes through rolling farmland. For the rest of I-129's length, the two directions of I-129 / US 20 / US 75 traffic are separated by a Jersey barrier instead of a grassy median. The three routes cross the Missouri River and immediately intersect Interstate 29 at an interchange. Due to the minimum amount of space along the Missouri River banks, the I-29 interchange is a modified two-level cloverstack interchange. At I-29, US 20 and US 75 continue east around Sioux City and I-129 ends.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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