EMERYVILLE (CBS SF) — An overturn big rig triggered an injury accident early Tuesday that blocked several lanes on westbound Highway 80 in Emeryville, slowing traffic to a crawl into San Francisco.

The California Highway Patrol said that only one westbound lane was open on the busy freeway at 5:32 a.m. — drive times have reached over an hour from the Carquinez Bridge to the MacArthur Maze.

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The CHP said the collision was first reported at 4:43 a.m. just west of Ashby Avenue.

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Motorists were injured the crash, but their conditions and numbers were not immediately known.

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Commuters were advised to take alternates routes as all traffic was being diverted off the freeway at University Avenue in Berkeley. There was no estimated time of reopening.