Interstate 180 (Wyoming)
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I-180 highlighted in red
|Auxiliary route of I-80|
|Maintained by WYDOT|
|Length||1.09 mi (1.75 km)|
I-80 / I-25 Bus. / US 85 / US 87 Bus. in Cheyenne
I-80 Bus. / US 30 / I-25 Bus. / US 85 / US 87 Bus. in Cheyenne
It is unusual for being one of the few Interstate highways that does not conform to Interstate highway standards. There is also no freeway anywhere along its route. Other routes in Alaska and Hawaii are similar in nature by being funded by Interstate dollars but not conforming to interstate highway standards. The only grade separations are a diamond interchange at its southern end (at I-80) and a pair of bridges that run 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.
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 highway 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 the 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 passes local homes and businesses. The road curves northwest and intersects 5th Street at a traffic light. The highway 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.
|0.00||0.00||US 85 south (I-25 Bus. / US 87 Bus. south) – Greeley||Continuation beyond I-80; south end of I-25 Bus./US 85/US 87 Bus. concurrencies|
|I-80 – Rock Springs, Sidney||Signalized interchange; southern terminus; exit 362 on I-80|
|0.34||0.55||5th Street||Signalized at-grade intersection|
|0.61||0.98||9th Street||Signalized at-grade intersection|
|1.09||1.75||I-80 Bus. / US 30 (Lincolnway)||Signalized at-grade intersections; northern terminus|
|I-25 Bus. / US 85 / US 87 Bus. north (Warren Avenue)||One-way street; outbound access only; continuation beyond US 30; north end of I-25 Bus./US 85/US 87 Bus. concurrencies|
|I-25 Bus. / US 85 / US 87 Bus. (Central Avenue)||One-way street; inbound access only; north end of I-25 Bus./US 85/US 87 Bus. concurrencies|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- FHWA Route Log and Finder List Table 2 - Auxiliary Routes
- 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. 
- FHWA Route Log and Finder List Table 1 - Main Routes
- 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.