Current Corridor Conditions
The existing I-15 corridor consists of three lanes in each direction from the California–Nevada state line to the I-15/Sloan Road interchange. From the Sloan Road interchange to the St. Rose Parkway interchange, I-15 provides four lanes in each direction. North of St. Rose Parkway, I-15 generally consists of at least five lanes in each direction.
There are two existing interchanges along I-15 south of Sloan Road. The Jean interchange, constructed in 1958, provides access to Goodsprings Road (State Route 161). Goodsprings Road consists of one lane in each direction beneath I-15, with limited vertical clearance between the roadway and the underside of the I-15 bridges.
Similarly, the Primm interchange, which was also constructed in 1958, provides two eastbound lanes and three westbound lanes on Primm Boulevard. Limited vertical clearance between Primm Boulevard and the I-15 bridges is also a concern.
Daily Traffic Travel Patterns
Historically, from 2016 to 2025, the I-15 corridor south of Sloan has carried approximately 50,000 vehicles per day. As expected, peak traffic periods occur on Friday afternoons, with travelers heading from California to Las Vegas, and on Sundays, with travelers returning to Southern California.
These traffic volumes are well below the available capacity of I-15 within Nevada but are approaching the available capacity of I-15 in California.
Corridor Safety
Safety is a primary concern and statewide focus for NDOT. Based on five years of crash data from January 1, 2018, through December 31, 2022, there were 15 fatal crashes along I-15 south of Sloan, resulting in 22 fatalities. Crash hot spots were identified near the Jean and Primm interchanges.
Overall, this segment of I-15 exceeds the statewide average crash rates only for incapacitating injury crashes and overall injury crashes.
Current Planned Corridor Improvements (2050 RTP)
Several projects are already planned within the 20-year planning horizon for the I-15 corridor. These projects will improve access, accommodate future growth, and support major transportation investments throughout the corridor.
Planned projects include:
Construction of a new interchange at I-15 and Via Nobila, located between St. Rose Parkway and Sloan Road.
Reconstruction of the existing Sloan Road interchange, which will be renamed the Via Inspirada interchange.
Reconstruction of the existing Jean interchange to meet current vertical clearance standards and accommodate the future widening of Goodsprings Road.
Construction of a new interchange approximately two miles north of the Primm interchange to provide additional access to the Southern Nevada Supplemental Airport.
Construction of the Brightline West high-speed rail system from Rancho Cucamonga to Las Vegas, with most of the alignment located within the I-15 corridor.
Construction by Brightline West of two emergency vehicle crossings consisting of bridge structures over I-15 and the rail alignment, along with restricted-use ramps providing access to the bridge structures.
