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CARSON, Los Angeles County, Calif., Sept. 22, 2026 — A multi-vehicle crash blocked lanes on northbound Interstate 405 near Wilmington Avenue early Monday morning, September 21, according to the California Highway Patrol. At least one injury was reported.
The California Highway Patrol said a caller first reported a sedan stopped in the middle lanes of the freeway just after midnight. Within minutes, additional calls described a chain-reaction collision involving multiple vehicles, including a Ford and several others, spreading across the fast lane, middle lanes and the carpool lane, the agency reported.
A caller told dispatchers one of the vehicles may have gone up onto the center divider, raising concern about possible injuries, though the extent of any injuries had not been confirmed as of Monday. Debris from the wreck reportedly scattered into lanes on the southbound side of the freeway as well, prompting a separate check by authorities for hazards there.
Emergency crews closed or partially blocked the slow lane and the carpool lane on the northbound side while they worked the scene, the California Highway Patrol said. A tow rotation was requested to clear the vehicles, and traffic backed up from as far away as the 710 interchange before the roadway reopened.
The California Highway Patrol has not released the number of people hurt, the vehicles involved beyond the one confirmed sedan, or a cause. The crash remains under investigation.
We hope those who were hurt recover fully and quickly.
When Multi-Vehicle Freeway Crashes Are Most Likely
Chain-reaction crashes on freeways like this one tend to cluster in the early morning hours, long after the evening commute has cleared but before sunrise traffic builds. Darkness reduces the distance drivers can see debris, a stalled car, or a slowing vehicle ahead, so the first hazard often goes unnoticed until it's too late to stop safely.
Fatigue plays a bigger role overnight than at almost any other time of day. Reaction times slow, following distances shrink without drivers realizing it, and a single vehicle that loses control or stalls can trigger a pileup before anyone behind it has a chance to react. Traffic moving at highway speed in multiple lanes, as on a stretch like I-405, gives following drivers little room to adjust once a collision begins.
According to the National Highway Traffic Safety Administration, an estimated 2,442,581 people were injured in traffic crashes in 2023. Overnight hours consistently show a mix of higher speeds and lower visibility that lets a single-vehicle incident turn into a multi-car crash within seconds.
Frequently Asked Questions
Why is distracted driving a factor in multi-vehicle crashes?
Even a few seconds looking away from the road can prevent a driver from noticing a slowing or stopped vehicle ahead, especially at night when reaction time is already reduced. That delay is often what turns a single incident into a chain-reaction crash.
How do road and weather conditions add to freeway crash risk?
Wet pavement, debris, and poor lighting all reduce traction and visibility. On multi-lane freeways, a hazard in one lane can force sudden lane changes that ripple through nearby traffic before drivers have time to adjust their speed.
What should I do immediately after a car accident?
Move to a safe location if possible, check for injuries, and call 911. Turn on hazard lights, avoid standing in traffic lanes, and wait for law enforcement to document the scene before assuming the incident is resolved.
What to Do After a Multi-Vehicle Crash in Carson, CA
If you're involved in or witness a freeway crash near Carson, safety comes first. Stay inside your vehicle if you're stopped in traffic and it's not safe to exit, and turn on hazard lights to alert approaching drivers.
Anyone involved should seek a medical evaluation even if injuries aren't immediately obvious, since impacts and sudden stops can cause pain or symptoms that appear later. Report the crash to the California Highway Patrol if it hasn't already been documented, and keep a copy of any report filed for insurance or personal records.
