Interstate 180 (Wyoming)
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| North Greeley Highway | ||||
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| Route information | ||||
| Auxiliary route of I-80 | ||||
| Maintained by WYDOT | ||||
| Length: | 1.09 mi (1.75 km) | |||
| Existed: | 1984 – present | |||
| Major junctions | ||||
| South end: |
 I-80 in Cheyenne
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| North end: |
  I-80 Bus. / US 30 in Cheyenne |
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| Highway system | ||||
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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. 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.
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