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The crash was reported shortly after 6 a.m. on northbound I-680, north of El Cerro Boulevard.
CHP Officer Tom Maguire said the motorist, a 30-year-old Sacramento man, was driving a black 2002 Lincoln Navigator at speeds that may have exceeded 100 mph.
When he came upon stopped traffic, he slammed on the brakes and veered to the right, causing the vehicle to leave the roadway, strike an electrical box and travel up a dirt embankment, Maguire said.
The sport utility vehicle rolled multiple times and the Sacramento man, who was not wearing a seatbelt, was ejected. He was pronounced dead at the scene.
His passenger, 25-year-old Christian Gutierrez of Gilroy, was wearing a seatbelt and was transported to John Muir Medical Center in Walnut Creek with injuries that were not life-threatening, Maguire said.
The driver's name has not been released.
Maguire said the CHP believes alcohol was a factor in the crash but that the investigation is still under way.
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