Interstate 129
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Interstate 129 (I-129) is an auxiliary Interstate Highway which connects South Sioux City, Nebraska, to I-29 in Sioux City, Iowa. Opened in 1976, I-129 is a Script error: No such module "convert". route, running Script error: No such module "convert". in Nebraska. At Script error: No such module "convert"., I-129 is the shortest highway in the state of Iowa. All of the route's length is concurrent with U.S. Route 20 (US 20) and most of its length is concurrent with US 75.
Route description
I-129 begins along US 20 on the western edge of South Sioux City, Nebraska, just west of exit 1, a cloverleaf interchange with US 75 and US 77. US 77 travels north through South Sioux City before ending at I-29 in Sioux City while US 75 joins I-129 and US 20. Script error: No such module "convert". later, I-129/US 20/US 75 intersect Dakota Avenue at a partial cloverleaf interchange. U.S. Highway 20 Business (US 20 Bus.) is designated along Dakota Avenue.[1]
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 I-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.[2]
History
After the passage of the Federal-Aid Highway Act in 1968, the mileage which would eventually be manifested in over Script error: No such module "convert". of Interstate Highway was allocated to the states. Iowa received the smallest allocation, Script error: No such module "convert"., for the southern bypass of Sioux City.[3] The proposed highway was planned to cost $22.5 million (equivalent to $Expression error: Unrecognized punctuation character "[". million in Template:Inflation/year), which included $15 million (equivalent to $Expression error: Unrecognized punctuation character "[". million in Template:Inflation/year) for the Missouri River bridge.[4] On the 1973 state highway map, the Iowa State Highway Commission showed the planned route on the state map for the first time.[5] I-129 was opened on November 22, 1976.[6]
Exit list
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References
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- ↑ Template:Cite IowaDOT map
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