Video captured spectators gathering and walking on the lanes while fireworks were lit. It appears as though a couple dozen people were standing outside their cars during the incident.
A witness who captured the video said he was on his way to work when the shutdown happened on the northbound side of the freeway.
LAST YEAR: 'Car meet' takes over streets near Galleria with wild stunts and fireworks
Several people were seen running and jumping during the illegal impromptu fireworks show.
The footage also shows at least one car performing a donut, with a handful of people followed closely behind the vehicle.
The California Highway Patrol said it did not have any details on the incident.
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'Car meet' takes over streets near Galleria with wild stunts