CASTRO VALLEY (CBS SF) — All lanes of westbound Interstate Highway 580 have reopened Thursday afternoon after a pair of big-rig collisions that turned fatal and blocked traffic for nearly 10 hours near Castro Valley in unincorporated Alameda County.

A Sig-alert was issued at 4:24 a.m. because all westbound Highway 580 lanes were blocked. It was finally canceled around 2 p.m.

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California Highway Patrol Officer Tyler Hahn said a black sedan collided with a big-rig around 4 a.m., affecting the driver’s ability to steer the vehicle. The first big-rig came to rest in the middle of the freeway and was subsequently struck by a second big-rig.

The man driving the second big-rig died as a result of the collision, according to Hahn. He’s been identified as 62-year-old Maclovio Lopez of Roseville, according to the Alameda County coroner’s bureau

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Personnel on the scene unloaded one of the heavily damaged trucks at the scene, which contributed to traffic delays.