8-Vehicle Chain-Reaction Crash on Northbound Interstate 15 [Cajon Pass, CA]

Police Investigate 8-Vehicle Chain-Reaction Crash on Northbound Interstate 15

CAJON PASS, CA (May 21, 2026) — An eight-vehicle chain-reaction crash on northbound Interstate 15 caused major delays Thursday morning in the Cajon Pass.

According to the California Highway Patrol, the pileup happened around 6:06 a.m. on May 21, 2026, about two miles before the Oak Hill Road exit.

CHP said the crash blocked the fast lane and the No. 2 lane. Investigators believe blinding sunlight and speed may have contributed to the initial collision.

Officials also said the first crash may have involved a disabled vehicle or a slow-moving vehicle in one of the traffic lanes.

After the first impact, several other vehicles collided in a chain reaction. CHP said about eight vehicles were involved in the main pileup.

Five additional vehicles were involved in secondary crashes as traffic backed up near the scene.

Officials stopped traffic while crews cleaned up debris and removed damaged vehicles from the lanes.

Authorities have not yet released information about possible injuries.

The California Highway Patrol’s Inland Office is investigating the crash and will release more details when its preliminary accident report becomes available.

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A chain-reaction crash involving multiple vehicles can leave drivers and passengers facing confusion, stress, vehicle damage, and possible injuries.

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