SAN JOSE (CBS SF) — A box truck driver fell asleep while driving on northbound U.S. Highway 101 in San Jose early Wednesday morning, causing the truck to go off the road and crash, killing a passenger inside it, a California Highway Patrol spokesman said.

The crash was reported shortly after 3:45 a.m. on northbound Highway 101 in the area of McKee Road.

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The driver, who was traveling north from the Los Angeles area, temporarily dozed off and allowed the truck to drift off the right shoulder of the highway to a sloped embankment, causing it to overturn, CHP Officer Ross Lee said.

A male passenger who was sleeping in the backseat and was apparently not properly restrained by a safety belt died from head injuries in the crash, Lee said. His name has not yet been released.

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The driver suffered major injuries and was taken to a hospital.

The crash also caused fuel to spill onto the roadway, but because it was raining at the time, the fuel washed away, according to Lee.

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The crash initially caused the closure of all northbound lanes of the highway. The far left lane reopened by shortly after 6 a.m. and all but the far right lane reopened by 9 a.m.