VALENCIA (CBSLA.com) —A collision between two big rigs Tuesday evening caused a traffic jam and spilled gallons of milk on the southbound 5 Freeway in Valenica.

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The big rigs, one which carried 80,000 gallons of milk, crashed on the freeway near the Magic Mountain Parkway off-ramp.

All four lanes were initially blocked, but one was later cleared.

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The other three lanes are expected to remain shut down until at least 12:30 a.m.

California Highway Patrol officers are on the scene.

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Caltrans was called to clean up the spill.