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Interstate 270 (Maryland)
・ Interstate 270 (Ohio)
・ Interstate 271
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・ Interstate 275 (Ohio–Indiana–Kentucky)
・ Interstate 275 (Tennessee)
・ Interstate 275 bridge
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・ Interstate 277 (Ohio)
・ Interstate 278
・ Interstate 279
・ Interstate 280


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Interstate 270 (Maryland) : ウィキペディア英語版
Interstate 270 (Maryland)

Interstate 270 (abbreviated I-270) is a auxiliary Interstate Highway in the U.S. state of Maryland that travels between I-495 (the Capital Beltway) just north of Bethesda, Montgomery County and I-70 in the city of Frederick in Frederick County. It consists of the mainline as well as a spur that provides access to and from southbound I-495. I-270 is known as the Washington National Pike, and makes up the easternmost stretch of the Dwight D. Eisenhower Memorial Highway.〔(【引用サイトリンク】title= Dwight D. Eisenhower Highway )〕 Most of the southern part of the route in Montgomery County passes through suburban areas around Rockville and Gaithersburg that are home to many biotech firms. This portion of I-270 is up to twelve lanes wide and consists of a local-express lane configuration as well as high-occupancy vehicle lanes that are in operation during peak travel times. North of the Gaithersburg area, the road continues through the northern part of Montgomery County, passing Germantown and Clarksburg as a six- to eight-lane highway with a HOV lane in the northbound direction only. North of here, I-270 continues through rural areas into Frederick County and toward the city of Frederick as a four-lane freeway.
The freeway was built between 1953 and 1960 as the Washington National Pike between Bethesda and Frederick and carried U.S. Route 240 (US 240), which was rerouted off what is now Maryland Route 355 (MD 355) between these two points. With the creation of the Interstate Highway System a few years later, the road was designated as I-70S along with US 240. There were plans to extend I-70S to I-95 in Washington, D.C. on the North Central Freeway from the Capital Beltway; however, they were cancelled in the 1970s due to opposition from residents in the freeway’s path. The concurrent US 240 designation was removed in 1972 and I-70S became I-270 in 1975. Increasing traffic levels led to a $200 million widening of the road in Montgomery County to its current configuration and further increased traffic. Many improvements are slated for I-270, including the construction of three new interchanges and the widening of the route between Shady Grove Road and Frederick that would add high-occupancy vehicles lanes and high-occupancy toll lanes.
==Route description==


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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