The crash, involving at least five vehicles, was reported at about 12:25 a.m. just west of Schaefer Ranch Road on Highway 580 west of Dublin, according to CHP Officer Pacheco.
The Alameda County coroner's bureau was contacted at about 12:35 a.m. about a fatality at the scene of the crash, according to the CHP.
All lanes were blocked on eastbound Highway 580 until about 3:30 a.m. and authorities diverted traffic to Dublin Canyon Road and back onto Highway 580 from Foothill Road, Pacheco said.
A Sig-alert was issued at about 12:35 a.m., according to Pacheco, and was canceled at about 3:35 a.m. when the lanes were reopened, according to CHP Officer Robert Haven.
