A semi overturned on the northbound Golden State Freeway near Gorman and prompted the closure of one lane of the freeway until at least 5 a.m.
The crash occurred just south of State Route 138 about 2:20 a.m. and the cab of the truck was blocking the No. 4 lane of the freeway with the trailer down an embankment, according to the California Highway Patrol.
A SigAlert was issued until at least 5 a.m. for the No. 4 lane of the freeway, the CHP said.
No injuries were immediately reported.
Details of what caused the crash were not disclosed.