San Ramon, Calif. (KTVU) -- The CHP is still trying to figure out why a teenager jumped out of a car moments before he was hit and killed by an oncoming vehicle Friday night in San Ramon.
According to authorities, the incident happened just before 10:30 p.m. on Interstate 680, near the Alcosta Boulevard exit.
The CHP says the 16-year-old boy was in a car with another person, and then for unknown reasons, he jumped out.
It's still not clear if his car was moving, but the teen landed on the roadway.
The CHP says another car drove by and hit him, and then and drove off.
The roadway was shut down for two hours.
"Vehicle debris from a Hyundai," said Sgt. Justin Bradford, California Highway Patrol. "That's the make we know.
It's a sedan. The damage would be on the left front of the vehicle."
Officers say the hyundai they are looking for is white.