An overturned mobile home closed the northbound lanes of Interstate 5 near Castaic for hours Sunday evening, authorities said.
All lanes were reopened at about 8:40 p.m., but traffic remained heavily backed up, according to CHP officials.
The crash was reported just before 5 p.m. near Pyramid Lake. All northbound lanes were closed for more than 90 minutes before two were reopened, according to the California Highway Patrol.
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Additional details were not immediately available.