Big Rig Overturns, All Lanes Cleared on Westbound Hwy 4 in Antioch

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    NBC Bay Area
    Firefighters in Antioch investigate what caused a big rig to overturn on westbound Highway 4 Saturday morning.

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

    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.