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Interstate 680 (abbreviated I-680) in Nebraska and Iowa is the northern bypass of the Omaha – Council Bluffs metropolitan area. I-680 spans from its southern (counterclockwise) end in western Omaha to its eastern (clockwise) end near Neola, Iowa. For a stretch, I-680 is co-signed with I-29. The freeway passes through a diverse range of scenes and terrains – the urban setting of Omaha, the Missouri River and its valley, the rugged Loess Hills, and the farmland of Pottawattamie County, Iowa. Until 1973, the section in Iowa between the current eastern end and I-29 was designated as Interstate 80N. I-680 in Omaha was originally designated Interstate 280. Maps from the early and mid-1960s showed I-280 in Omaha. Since this highway would extend into Iowa, and I-280 was already planned for the Quad Cities area, this route was redesignated I-680. ==Route description== Interstate 680 begins at a complex interchange with I-80 in Omaha. Due to the proximity of the West Center Road interchange on I-680 and the I, L and Q Street interchanges on I-80, all of the exit and entrance ramps which connect I-80 to I-680 also connect to West Center Road and I, L and Q Streets. The freeway heads north through the heart of West Omaha; it serves as a dividing line of several residential neighborhoods. north of West Center Road, which prior to 2003 was N-38, is a new interchange with U.S. Route 6 (US 6), known as Dodge Street in Omaha.〔 Another mile north of Dodge Street is N-64, known as Maple Street.〔 At N-133, I-680 turns to the east towards Iowa. South of this interchange, I-680 travels through residential neighborhoods, but to the east, the population thins and the interstate passes through farmland for . I-680 crosses over N-36, which is accessed via the US 75 interchange later. US 75 runs adjacent to I-680 for before turning south at 30th Street.〔 The interstate crosses the Missouri River to Iowa via the Mormon Bridge. In Iowa, Interstate 680 is markedly less urban than in Nebraska. The first of I-680 travel through the flat bottoms of the Missouri River valley. At the interchange west of Crescent, eastbound I-680 joins northbound I-29 for just under .〔 The north–south stretch of I-29 / I-680 sits approximately halfway between the Missouri River and the Loess Hills. Near the unincorporated village of Loveland, I-680 exits from I-29 and turns east again, immediately entering the Loess Hills. For , I-680 cuts through the rugged Loess Hills. east of the I-29 interchange, there is a scenic overlook for westbound traffic. The Loveland overlook gives a view of the Loess Hills and Missouri River valley. Continuing east, I-680 travels over the rolling hills of rural Pottawattamie County. of Neola, I-680 meets the southern end of Iowa Highway 191 (Iowa 191) before ending itself later at a full Y interchange at I-80.〔 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 680 (Iowa–Nebraska)」の詳細全文を読む スポンサード リンク
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