Interstate 180 (Wyoming)
|North Greeley Highway|
|Auxiliary route of I-80|
|Maintained by WYDOT|
|Length:||1.09 mi (1.75 km)|
|Existed:||1984 – present|
|South end:||I-80 in Cheyenne|
|North end:||I-80 Bus. / US 30 in Cheyenne|
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. 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. 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. It is also the only 3-digit interstate in Wyoming.
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.
I-25 Bus. south / US 85 south / US 87 Bus. south – Greeley, CO, Denver, CO
|Continuation past I-80|
|I-80 – Sidney, Rock Springs, Omaha, Salt Lake||Southern terminus; exit 362 on I-80|
|0.34||0.55||5th Street||At-grade intersection; signalized intersection|
|0.61||0.98||9th Street||At-grade intersection; signalized intersection|
|1.09||1.75||I-80 Bus. / US 30 (Lincolnway)||At-grade intersections; signalized intersections; northern terminus|
I-25 Bus. north / US 85 north / US 87 Bus. north
|Continuation past US 30|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi
- 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.  There are Business US 30 shields where W Lincolnway splits off from I-80 (Photos: ,  from ) and on E Lincolnway (Photos: ,  from ) but there are East US 30/West US 30 shields at other places, including the I-180 junction. 
- Photos showing road signs and traffic lights on I-180:  from ,  and  from .
- Google (December 19, 2013). "overview of Interstate 180" (Map). Google Maps. Google. Retrieved December 19, 2013.
- "Reference Marker Book". Wyoming Department of Transportation. November 2004. Archived from the original (PDF) on 2007-03-11. Retrieved 2007-03-10.
Route map: Google
|Wikimedia Commons has media related to Interstate 180 (Wyoming).|