The California Highway Patrol tweeted saying all three victims were men.
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The two passengers are a 22-year-old from Hayward and a 31-year-old from Oakland.
No word on the driver's age, or their exact identities.
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Officers say they veered off the freeway around 3a.m. Saturday, and smashed into a tree right by the Camino Pablo exit.
Investigators believe the slick roads are at least one factor.
All westbound lanes reopened at around 6:30am Saturday.