U.S. Route 91 in Nevada
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| Route information | ||||
| Maintained by NDOT | ||||
| Length: | 123.776 mi (199.198 km) | |||
| Existed: | June 29, 1956 – present | |||
| Major junctions | ||||
| South end: |
 I-15 at California state line |
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  I‑215 / CC 215 in Enterprise   I‑515 / US 93 / US 95 in Las VegasCC 215 in North Las VegasUS 93 near North Las Vegas
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| North end: |
 I-15 at Arizona state line |
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| Highway system | ||||
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→.svg)
Interstate 15 (I-15) is an Interstate Highway in the U.S. state of Nevada that begins in Primm, continues through Las Vegas and it crosses the border with Arizona in Mesquite. The freeway runs entirely in Clark County. Many motorists use I-15 to visit Las Vegas, as it is the only primary Interstate Highway in the city. The highway was built along the corridor of the older U.S. Route 91 (US 91) and Arrowhead Trail, eventually replacing both of these designations.
Motorists in California leave the mountainous Mojave Desert and begin a long descent through Ivanpah Valley and Ivanpah Dry Lake. I-15 crosses the Nevada state line at the first exit, Primm. Once I-15 leaves Primm, the route travels north through the desert with few services. The highway then enters the Las Vegas urban area upon passing the State Route 146 (SR 146, Saint Rose Parkway) interchange. Quickly thereafter, the Interstate meets I-215 at the Southern Beltway Interchange, which provides access to Henderson and McCarran International Airport. Originally, this interchange was termed Son of Spaghetti Bowl by the Las Vegas Review-Journal when the interchange was built.
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