Crash jams up I-680 commuters in Alameda County

A man died Thursday night after stepping into the path of a car on Interstate 80 in Vallejo, triggering a chain reaction crash. A man died Thursday night after stepping into the path of a car on Interstate 80 in Vallejo, triggering a chain reaction crash. Photo: California Highway Patrol / Photo: California Highway Patrol / Image 1 of / 27 Caption Close Crash jams up I-680 commuters in Alameda County 1 / 27 Back to Gallery

Two southbound lanes on Interstate 680 in Sunol were blocked for nearly an hour early Friday after a vehicle crashed into the center divider, authorities said.

The incident was reported just after 5 a.m. on Interstate 680 near the Andrade Road off-ramp, according to the California Highway Patrol.

Tow trucks were at the scene to clear the roadway.

A severe traffic alert was issued for the area and morning commuters faced one-hour delays. All lanes were reopened by about 6:10 a.m.

There was no immediate information on injuries.

Sarah Ravani is a San Francisco Chronicle staff writer. Email: sravani@sfchronicle.com Twitter: @SarRavani