REDWOOD CITY (CBS SF) — Four lanes of southbound U.S. Highway 101 in Redwood City were blocked for almost two hours after a four-vehicle traffic collision sent five people to the hospital late Wednesday, according to the California Highway Patrol.

The CHP said the collision was first reported at 10:12 p.m. Wednesday. At least one of the vehicles had overturned and a 65-foot section of guardrail was damaged.

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Authorities suspect the crash may have been caused by a possible DUI driver.

Five people were taken to Stanford University Medical Center, though CHP said the injuries were minor.

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Shortly after midnight, the four right lanes were cleared of debris and reopened.