A big rig and a vehicle crashed Wednesday on the westbound Pomona (60) Freeway and three lanes of the freeway were blocked until at least 5:30 a.m.
The crash was reported near the Fullerton Road exit about 1:15 a.m., according to the California Highway Patrol.
A large amount of debris, transmission and radiator fluid and oil was spread across the freeway as a result of the crash, the CHP said. The Nos. 2, 3 and 4 westbound lanes were closed until at least 5:30 a.m. to allow crews to cleanup the debris and fluid.
It was unclear if anyone was injured.
The cause of the accident was under investigation.