Interstate 180 (Wyoming)

Interstate 180
Route information
	Maintained by WYDOT
Length:	1.09 mi (1.75 km)
Existed:	1984 – present
Major junctions
South end:	; I-80 / I-25 Bus. / US 85 / US 87 Bus. in Cheyenne
North end:	I-80 Bus. / US 30; ; I-25 Bus. / US 85 / US 87 Bus. in Downtown Cheyenne
Highway system

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Interstate 180 (abbreviated I-180) is a spur off Interstate 80 into downtown Cheyenne, Wyoming.

[edit] Route description

It is unusual for being the only Interstate Highway that is not up to Interstate Highway standards (or even a freeway) anywhere on its route.^[1] The only grade separations are a standard diamond interchange at its southern end at I-80 and bridges over 1st Street and the Union Pacific railroad tracks. It is a divided at-grade expressway with a 40 mph (60 km/h) speed limit due to the frequency of signals. There are five traffic signals along I-180.^[3] 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.^[3]

I-180/US 85/I-25 BUS (south) at its northern terminus at US 30/I-80 BUS (Lincolnway) in Cheyenne.

The entire route is in Cheyenne, Laramie County.

Mile^[4]	Destinations	Notes
0.00	I-80 – Laramie, Pine Bluffs I-25 Bus. south / US 85 south / US 87 Bus. south – Greeley	Interchange, roadway continues beyond I-80 as I-25 Bus. / US 85 / US 87
0.20	1st Street	Grade separation
0.40	5th Street	Stoplight
0.70	9th Street	Stoplight
1.09	I-80 Bus. / US 30 (Lincolnway) – Laramie, Pine Bluffs I-25 Bus. / US 85 north / US 87 Bus. north – Wheatland, Torrington	Roadway continues beyond I-80 Bus. / US 30 as I-25 Bus. / US 85 / US 87
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

^ ^a ^b FHWA Route Log and Finder List - Interstate System - Design - FHWA
^ It isn't clear whether Lincolnway, the road at the northern terminus of I-180 is US 30 or BUS US 30. [1] There are Business US 30 shields where W Lincolnway splits off from I-80 (Photos: [2], [3] from [4]) and on E Lincolnway (Photos: [5], [6] from [7]) but there are East US 30/West US 30 shields at other places, including the I-180 junction. [8]
^ ^a ^b Photos showing road signs and traffic lights on I-180: [9] from [10], [11] and [12] from [13].
^ "Reference Marker Book" (PDF). Wyoming Department of Transportation. November 2004. Archived from the original on 2007-03-11. http://web.archive.org/web/20070311005354/http://www.dot.state.wy.us/FileDownload.jsp?sCode=hompo&sDID=1415660637. Retrieved 2007-03-10.

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