EMERYVILLE (CBS SF) — An overturned container truck transporting produce blocked lanes of eastbound I-80 in Emeryville Friday morning for hours, snarling traffic at the MacArthur Maze.

Authorities said the crash happened at around 10:15 a.m. CHP and Alameda County Fire units replied to the scene.

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At around 10:24 a.m., CHP issued a severe traffic alert after a collision involving an overturned truck happened on eastbound I-80 west of Powell Street in Emeryville.

Officials later said the container truck was carrying large quantities of lettuce which spilled onto the freeway.

I-80 truck overturned in Emeryville (CHP Oakland)

A post by the KCBS Traffic Twitter account indicated that the lane blockage was also impacting I-880 northbound and I-580 westbound.

Alameda County Fire reported that while the driver of the truck wasn’t injured, he was transported to an area hospital as a precaution. Firefighters are tending to the driver’s dog, who was also uninjured.

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Shortly after 1 p.m., authorities were able to reopen the center lane, but the left lanes were still blocked as of about an hour later.

All lanes were finally cleared shortly before 3 p.m. The incident lasted nearly five hours.

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Motorists are advised to expect residual delays and to use alternate routes to avoid the area.