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UNION CITY, Alameda County, Calif., Sept. 17, 2026 — A three-vehicle crash blocked lanes on southbound I-880 near Alvarado-Niles Road in Union City on Wednesday afternoon, September 16.
The California Highway Patrol received reports of a crash involving a blue Cadillac and a blue BMW in the number one lane shortly before 3:40 p.m., according to dispatch logs. A third vehicle was reportedly involved, and radio traffic described a 5-year-old in one of the vehicles as hysterical, though the child's condition was not released.
Dispatchers classified the collision as a minor-injury crash. Two lanes were reported blocked while crews worked the scene, and at least one tow truck was requested to remove vehicles from the roadway. Detectives have not released information on the number of people injured or their conditions.
No further details on the cause have been made public. The crash remains under investigation, and authorities have not said whether any citations or contributing factors have been determined.
We hope those who were hurt recover fully and quickly.
How Investigators Piece Together a Multi-Vehicle Freeway Crash
When a crash involves three vehicles on a busy freeway, officers first have to secure the scene and get traffic moving safely again before they can focus on how the collision happened. That initial phase, clearing blocked lanes, arranging tows, and checking on anyone hurt, usually takes priority over determining fault.
Once the roadway is clear, investigators typically rely on physical evidence such as skid marks, vehicle damage patterns, and witness statements to reconstruct the sequence of impacts. In cases involving injuries, medical evaluations and any citations issued can take additional time to finalize, and agencies generally wait to release names or contributing-factor findings until they've been verified and, when applicable, families have been notified.
According to the National Highway Traffic Safety Administration, 23,959 passenger-vehicle occupants were killed in motor-vehicle traffic crashes in 2023. That scale of data collection is part of why full crash reports, even for injury-only collisions, can take weeks to complete.
Frequently Asked Questions
How does speed affect crash severity?
Higher speeds increase the distance needed to stop and the force of any impact, which raises the likelihood of injury even in a multi-vehicle pileup on a freeway.
Why is distracted driving so dangerous in freeway traffic?
Even a few seconds looking away from the road can prevent a driver from reacting in time to slowing or stopped traffic ahead, which is a common factor in chain-reaction crashes.
What should I do immediately after a car accident?
Move to a safe location if possible, check for injuries, call 911, and exchange information with other drivers. Documenting the scene with photos can help later if questions arise about what happened.
What to Do After a Car Accident in Union City, CA
If you're involved in a crash on a freeway like I-880, try to move your vehicle out of traffic lanes if it's safe to do so, and turn on hazard lights to warn other drivers. Check on passengers and other drivers before doing anything else, and call 911 right away if anyone is hurt.
Even if injuries seem minor at first, it's worth getting checked out by a medical provider, since some injuries from a collision don't show symptoms immediately. Keep a copy of any police report and take note of contact information for witnesses in case you need it later.
