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|direction_b=North |terminus_b= in Waterloo |previous_type=IA |previous_route=376 |next_type=IA |next_route=404 |spur_type=I |spur_of=80 }} Interstate 380 (I-380) is a auxiliary Interstate Highway located in eastern Iowa. The route extends from Interstate 80 near Coralville to Waterloo. I-380 connects the cities of Cedar Rapids and Waterloo, the second- and sixth-largest cities in the state, respectively, to the Interstate Highway System. Except for its last north of U.S. Route 20 (US 20), I-380 runs concurrent with Iowa Highway 27, which represents Iowa's portion of the Avenue of the Saints Highway connecting St. Louis, Missouri, with St. Paul, Minnesota. Construction of I-380 took 12 years to complete, ending in 1985. After the interstate opened, US 218 was moved onto the new freeway. In the 1990s, the I-380 corridor was selected as part of the Avenue of the Saints corridor, which Iowa designated as Iowa Highway 27 in 2001. I-380 has been affected by two major floods, the Great Flood of 1993 and the Iowa flood of 2008, both of which closed the road at the Iowa River for two weeks. == Route description == Interstate 380 begins at a cloverleaf interchange where US 218 and Iowa 27 cross Interstate 80 in Coralville in Johnson County. From the interchange, I-380, US 218, and Iowa 27, the route assigned to the Avenue of the Saints Highway in Iowa, run together towards Cedar Rapids. The interstate heads north and serves North Liberty. North of North Liberty, the freeway runs parallel to the former routing of US 218 and Iowa 965; here the two highways cross the Iowa River. After crossing into Linn County, the three routes enter the Cedar Rapids city limits near The Eastern Iowa Airport. Three miles (4.8 km) north of the airport, I-380 intersects US 30 and US 151 at a cloverstack interchange. At this interchange, US 218 splits away from I-380 and Iowa 27.〔 Through Cedar Rapids, the I-380 freeway is elevated relative to the nearby streets and residential neighborhoods. As it approaches downtown and the Cedar River, the freeway takes a tight, 90-degree turn to the east, crosses the river, squeezes between a Quaker Oats plant and the U.S. Cellular Center before turning back 90 degrees to the north. Between downtown and the Coldstream–29th Street interchange, I-380 serves as a dividing line between residential areas to the east and industry to the west. Towards the north end of Cedar Rapids, industry is replaced with commerce as I-380/Iowa 27 meet Iowa 100, locally known as Collins Road, at a volleyball interchange. The collector/distributor ramps for Collins Road also serve the same function for Blairs Ferry Road, the next overpass to the north. The freeway leaves Cedar Rapids and enters Hiawatha, where there is only one interchange, a diamond with Boyson Road. Quickly escaping the Cedar Rapids area, I-380 turns to the northwest and passes through predominantly rural areas with small communities and farms dotting the way. Because of its northwestern angle, I-380 enters four counties within , as counties in Iowa are generally rectangular in shape. It passes Center Point in northwestern Linn County, Urbana in northeastern Benton County, where it meets Iowa 150, and Brandon in southwestern Buchanan County. The interstate travels into Black Hawk County heading northwest for before turning north for until a directional T interchange with US 20.〔 Together with US 20, I-380 and Iowa 27 travel west towards Waterloo and Cedar Falls. The three routes pass the eastern Waterloo suburbs of Raymond, Evansdale, and Elk Run Heights. Almost immediately after crossing the Cedar River again, I-380 splits away from US 20 and Iowa 27 and rejoins US 218 at a three-level stack interchange. I-380 and US 218 head north to the east of the Crossroads Center shopping mall. One half-mile (0.8 km) north of the interchange which serves the Crossroads Center, I-380 ends at the traffic light at Mitchell Avenue. US 218 continues to the north at this point.〔 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 380 (Iowa)」の詳細全文を読む スポンサード リンク
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