LAS VEGAS (FOX5) — Northbound Interstate 15 in the southern valley will be reduced to one lane overnight Thursday while two decorative sculptures are installed. The Nevada Department of Transportation will reduce northbound I-15 to one travel lane between St. Rose Parkway and Cactus Avenue from 7 p.m. Thursday until 3 a.m. Friday, according to an NDOT news release. General contractor Las Vegas Paving is installing two decorative sculptures at the new Starr Avenue interchange as part of the $36 million project’s landscaping and aesthetics, the release said. The I-15/Starr Avenue interchange opened to traffic Sept. 18. Motorists should use caution while travelling through the work zone, heed construction signage, and take alternate routes when possible, NDOT said.