PLACER COUNTY (CBS13) – Lanes of westbound Interstate 80 were closed near Colfax Monday after a big rig crashed through a guardrail.

The incident happened just west of Secret Town Road. The truck swerved to the right, crashed through a guardrail, and partially overturned.

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Traffic was being diverted at Secret Town Road and back on at Rollins Lake Road.

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The far-right (slow lane) opened just after 7 a.m.

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The truck is hauling about 10,000 pounds of styrofoam.