The fire was reported on the north side of the freeway, between Las Virgenes and Lost Hills roads, at 2:52 p.m.
By 3:25 p.m., it had burned up a hillside into grassy wildlands.
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A massive traffic jam ensued, as there are no major alternative routes from the San Fernando Valley to the Thousand Oaks area.
At about 3:30, the CHP reopened just one westbound lane, and they issued a SigAlert as they predicted the other three lanes would be closed for several hours as firefighters worked on the burning hillside.
-City News Service