The semi crashed into the center divider on the westbound side of the freeway near Vernon Avenue around 7:50 a.m., according to the California Highway Patrol's traffic log. That caused the front portion of the big rig to crash over onto eastbound lanes.
AIR7 was over the scene where what appeared to be oil, rocks and debris spilled across some lanes.
At least four westbound lanes and one eastbound lane were initially blocked off. All lanes were reopened around 11:30 a.m.