Interstate 180 (Wyoming)

Interstate 180
Auxiliary route of the Interstate Highway System

Length:

1.09 mi (1.75 km)

Formed:

1984

South end:

North end:

Bus I-80/US 30^[1] in Cheyenne, WY

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

It is unusual for being the only Interstate Highway that is not up to Interstate Highway standards (and not even a freeway) anywhere on its route. The only grade separations are a standard diamond interchange at its southern end at I-80, and a bridge over 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.^[2] 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. Route 85 and Business U.S. Route 87 making it the only concurrency of an Interstate, a Business Loop Interstate, a U.S. route and a Business U.S. route.^[2]

[edit] Notes

^ 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].

	edit Auxiliary routes of Interstate 80
	Current and Future (F)	Former
	Illinois - Nebraska - Pennsylvania - Wyoming	California - Pennsylvania
	California - Illinois/Iowa - New Jersey - Ohio	Nebraska - Pennsylvania
	California - Iowa - Pennsylvania
	Iowa/Nebraska - Ohio	California - Pennsylvania
	California - Nevada	Nebraska
	California - Iowa/Nebraska - Ohio	Pennsylvania
	California
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