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Interstate 180 (Wyoming)
Interstate 180 (I-180) is a one-mile (1.75 km)-long connector in the U.S. state of Wyoming off Interstate 80 into downtown Cheyenne, Wyoming.
It is unusual for being the only Interstate Highway that does not conform to Interstate Highway standards, and is not even a freeway, anywhere along its route.〔(FHWA Route Log and Finder List - Interstate System - Design - FHWA )〕 The only grade separations are a diamond interchange at its southern end at I-80, as well as bridges over 1st Street and the Union Pacific railroad tracks. However, even the interchange with I-80 is a standard diamond with signalized intersections. It is a divided at-grade expressway with a 40 mph (64 km/h) speed limit due to the frequency of signals. There are five traffic signals along I-180.〔''Photos showing road signs and traffic lights on I-180'': () from (), () and () from ().〕 This is nowhere near Interstate standards, but it received federal funding under the Interstate Highway program.
I-180 is cosigned with Business Loop Interstate 25, U.S. Highway 85 and U.S. Highway 87 Business, making it the only concurrency of an Interstate, a Business Loop Interstate, a U.S. route and a Business U.S. route.〔
==Route description==
I-180 begins at a diamond interchange with I-80 in Cheyenne, heading north concurrent with I-25 Bus./US 85/US 87 Bus. on four-lane divided North Greeley Highway. South of this interchange, I-25 Bus./US 85/US 87 Bus. continue along North Greeley Highway. From the southern terminus, I-180 passes over Deming Drive and heads near homes and businesses. The road curves northwest and intersects 5th Street at a traffic light. The highway continues along and passes under a pedestrian bridge at 7th Street before crossing 9th Street at a signalized intersection. Past 9th Street, the directions of I-180 split and pass over a large Union Pacific Railroad yard. After this bridge, I-180 reaches its northern terminus at an at-grade signalized intersection with I-80 Bus./US 30. Past this intersection, I-25 Bus./US 85/US 87 Bus. continue north on the one-way pair of Warren Avenue northbound and Central Avenue southbound.
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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