Available 
Available 
COSTA MESA, Orange County, Calif., Oct. 12, 2026 — A two-vehicle crash blocked lanes on northbound Interstate 405 near Harbor Boulevard in Costa Mesa, California, on Sunday morning, October 11, according to the California Highway Patrol. At least one person was reported injured.
The California Highway Patrol said a gray Honda sedan, driven by an older man, reportedly struck a center divider and crossed the northbound lanes before colliding with a black Tesla. The impact reportedly pushed the vehicles into the far lanes of the freeway, according to radio traffic from the scene. Investigators have not said what caused the Honda driver to lose control.
Responding units reported finding the Honda driver slumped over the wheel after the crash, raising the possibility of a medical emergency, though that has not been confirmed. Costa Mesa Fire and Rescue was called to the scene, and the California Highway Patrol's Freeway Service Patrol also responded to help clear wreckage.
Lanes on northbound I-405 were blocked for several hours while crews worked the scene. The California Highway Patrol reported all lanes reopened by early afternoon. The extent of injuries has not been released, and the crash remains under investigation.
We wish those injured a full recovery.
A Common Misconception About Medical Emergencies Behind the Wheel
Many drivers assume that a crash involving someone who appears to lose consciousness or control is simply a case of distracted or reckless driving. In practice, a vehicle drifting or crossing lanes without braking can also indicate a sudden medical event, such as a seizure or cardiac episode, and that distinction often isn't clear until investigators review the evidence.
This matters because the public conversation about traffic safety tends to focus heavily on speed and inattention. According to the National Highway Traffic Safety Administration, 88 percent of speeding-related fatalities occurred on non-interstate roadways when roadway classification was known in 2023, a reminder that the circumstances behind any single crash, including those on interstates like I-405, can vary widely and rarely fit a single explanation.
Treating every lane-departure crash as a speeding or distraction case can also delay recognition of a medical cause, which matters for how first responders treat the driver at the scene.
Frequently Asked Questions
What should I do immediately after a car accident?
Move to a safe location if possible, check for injuries, and call 911. Exchange information with other drivers and avoid discussing fault at the scene. Documenting the scene with photos can help later.
How do weather and road conditions contribute to crashes?
Wet pavement, glare, and heavy traffic can all reduce a driver's margin for reacting to a sudden hazard. Even clear-weather crashes often involve a mix of factors, including vehicle condition or a driver's physical state.
Where do most traffic accidents happen?
Crashes are common on both local roads and freeways, but the type and severity can differ. Interstate crashes often involve higher speeds and multiple vehicles, while surface-street crashes are more frequent overall.
What to Do After a Car Accident in Costa Mesa, CA
If you're involved in a crash in Costa Mesa, prioritize safety: turn on your hazard lights, check on passengers, and move out of traffic if you're able. Call 911 so police and medical teams can respond and document the incident.
Even if you feel fine, a medical evaluation is a good idea, since some injuries don't show symptoms right away. Keep a copy of any police report and note the names of responding agencies for your records. If you witness a crash, staying back and calling for help is often the most useful thing you can do.
