All lanes of WB Hwy. 4 in Antioch reopened after big rig overturned

State Highway 4 in Antioch reopened after a big rig overturned and was blocking all lanes Saturday morning, according to the California Highway

The tractor-trailer overturned at about 7:15 a.m. on Highway 4 near the Contra Loma Boulevard overpass, the CHP said.

A Sig-alert was issued at about 7:40 a.m. and the collision was cleared around 11:15 a.m., the CHP said.

The cause of the collision remains under investigation.
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crashtruck crashAntioch
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