Sig Alert, 15 Freeway, Cajon Pass 5:11 a.m.

A tractor trailer overturned on the northbound 15 Freeway while swerving to avoid a stalled vehicle, prompting a Sig Alert in the Cajon Pass.The crash was reported at 4:56 a.m. on the northbound 15 near Cleghorn Fire Road. The semi lost control while trying to avoid a car that was stopped in the slow lane. The crash severed the semi's fuel tank, which spilled 20 to 35 gallons of fuel on the roadway. All northbound lanes were blocked and the CHP issued a Sig Alert for an unknown duration. At 6:04 a.m., officers reopened the slow lane and right shoulder.