The CHP received a call at 1:17 a.m. initially reporting incorrectly that an accident took place on the connector ramp between Interstate Highway 280 and Highway 101, CHP Officer Ralph Caggiano said.
With the correct location obtained at 1:24 a.m., officers responded to the scene of the hit-and-run crash and found a fatally injured unidentified male driver in a 1999 Saturn, Caggiano said.
According to the report, a 2003 Honda traveling along I-680 at an unknown speed closed in on the Saturn while approaching the connector. For reasons unknown, the driver of the Honda rammed the Saturn, causing it to roll onto its roof before coming to a rest across both lanes of the ramp.
The unidentified driver of the Honda fled on foot, leaving the vehicle blocking traffic, which prompted a Sig-alert at 1:38 a.m.
The overturned Saturn leaked a small amount of fuel onto the roadway that was swiftly cleaned up by fire crews, Caggiano said.
Both lanes of traffic re-opened more than three hours later. Subsequently, the Sig-alert was cancelled at 4:30 a.m.
In its ongoing investigation, the CHP has yet to determine if alcohol was a factor in the collision.