An overturned big rig forced authorities to close the westbound 210 Freeway near the 134 Freeway early Tuesday morning, according to the California Highway Patrol.
The accident was reported around 4 a.m. and was affecting all lanes, according to the CHP.
A second big rig was near the scene of the turnover, but it was not clear how the truck was involved in the crash, according to the CHP.
Authorities issued a SigAlert and advised commuters to take the northbound 2 Freeway to the 134 Freeway.
CHP said the lane closures were expected to last a few hours.
Refresh this developing story for updates.