SUNOL -- Authorities have released the name of a 29-year-old man killed Saturday in a Highway 84 crash.

Todd Rizzo, of Livermore, died in the three-vehicle accident, an Alameda County Coroner's Bureau official said.

He was pronounced dead at the scene, a California Highway Patrol spokesman said.

Two motorists suffered non-life-threatening injuries, Officer Steve Creel said. The crash closed traffic on westbound Highway 84, east of the Interstate 680 interchange, for more than five hours.

The accident was reported at 5:44 p.m., when a 2004 Ford Taurus traveling east drifted into another lane where vehicles were traveling in the opposite direction, Creel said.

The Taurus, which was carrying Rizzo, crashed head-on with a big rig. A 2013 Toyota Highlander, which was trailing the big rig in the westbound lane, then crashed into the other two vehicles.

The big rig's driver, a 45-year-old Newman resident, suffered minor injuries, Creel said. The Highlander's driver, a 36-year-old Livermore woman, suffered moderate injuries, he said.

Authorities still are investigating why the Taurus drifted into the other lane, Creel said.

Westbound lanes of Highway 84 reopened just after 11 p.m., authorities said.

Contact Chris De Benedetti at 510-353-7011. Follow him at Twitter.com/cdebenedetti.