It's unclear what led up to the crash, but drivers are being asked to prepare for delays.
LOS ANGELES COUNTY (KABC) -- Traffic on the 5 Freeway near Newhall Pass was narrowed down to one lane Wednesday afternoon after a big rig tipped over on its side, leaving debris scattered across the road.
It's unclear what led up to the crash and if there are any injuries. As of 7 p.m., all northbound lanes have reopened, but a closure remains in place for the southbound lanes.
AIR7HD video from above the scene showed the big rig on its side, covering most of the lanes.
The truck is on the transition road and concrete debris from the sidewall of the overpass has been falling onto the lanes, prompting an immediate response from crews.