All lanes of eastbound Highway 4 in Antioch are open Tuesday afternoon after a big-rig overturned on the freeway, blocking lanes for several hours.

The Contra Costa office of the California Highway Patrol first reported the big-rig blocked the left three lanes of the freeway near the Contra Loma Blvd. exit around 8:50 a.m.

In an update posted shortly before 10 a.m., the agency said the left-three lanes were still closed, while the rightmost lane was open. All eastbound lanes of the freeway, a crucial link for commuters in Eastern Contra Costa County, were reopened around 12:30 p.m.

**TRAFFIC UPDATE** SR-4 EB at Contra Loma: Number 3 & 4 lanes (right 2 lanes) are open. ETO is within 2hours. Follow for updates. Time of this post is 11:33 AM. pic.twitter.com/iS0GUIXJwk — CHP Contra Costa

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