UPDATE (6:30 AM): California Highway Patrol said Thursday morning's crash on northbound Hwy. 99, south of Hwy. 166, involved six vehicles in four separate crashes. One driver suffered major injuries and two others had minor injuries, according to CHP.
CHP said three commercial vehicles were involved in the crashes and during one crash a vehicle crossed over into the southbound Hwy. 99 lanes but didn't crash into southbound vehicles.
The crashes were reported shortly before 3 a.m. and all lanes of northbound Hwy. 99 were closed to clean up the scene and for the CHP to investigate. Traffic was diverted to Hwy. 166 during the clean up and investigation. All Hwy. 99 lanes were reopened shortly before 11 a.m.
CHP said weather and visibility do not appear to be factors in the crash. It's unknown whether alcohol or drugs played a role in the crash, said CHP.
The crash is still under investigation.
UPDATE (11:00 AM): All but one northbound lane on the 99 at Highway 166 just reopened after a multi-vehicle crash. The crash happened around 3 a.m. Thursday morning just before the I-5/99 split. It involved several big rigs and cars. Until about 10:40 a.m. all lanes were closed. Northbound traffic was diverted onto Highway 166 to the I-5. California Highway Patrol says lanes 1, 2, and 4 are now open.
All northbound lanes of Highway 99 are closed at Highway 166 due to a multi-vehicle crash involving big rigs and cars. Traffic is being diverted onto Highway 166 and over to the I-5.
The crash happened around 3 a.m. just north of the I-5/State Route 99 split.
There is currently no time estimate for when the closure will end.
This is a developing story. We'll bring updates as we learn more.