The incident was reported about 1:15 a.m. near the the 605 Freeway interchange, according to the California Highway Patrol.
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An estimated 50 vehicles were involved in the freeway takeover, shutting down all eastbound lanes for at least 15 minutes, the CHP said.
News video from the scene showed a massive crowd of people standing on the freeway as street racers performed donuts, burnouts and other stunts. Traffic on that side of the 91 was backed up as a result.
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CHP units responded to the the location, and one person was taken into custody for an unspecified charge.
All lanes were subsequently reopened to traffic.