Overturned big rig closes 91 Freeway transition in Los Angeles County

A big rig overturned early Thursday morning, prompting officials to close a 91 Freeway transition road for several hours in Cerritos.

The crash was reported shortly before 1:30 a.m. near the beginning of the freeway transition from the eastbound 91 to the northbound 605 Freeway, according to the California Highway Patrol.

Video showed the tipped big rig and its loaded trailer resting on a freeway barrier wall.

The driver was able to exit the truck safely and did not appear to be seriously injured. No other vehicles were involved in the crash.

A SigAlert was issued shortly after the incident was reported and had to be extended again at 3:30 a.m.

It was unclear what caused the crash or when the roadway would reopen.

Check back for updates on this developing story.