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RIVERSIDE, Riverside County, Calif., Oct. 13, 2026 — Three vehicles, including a semi-truck, collided early Tuesday morning, October 13, at Center Street and Prospect Avenue in Riverside, according to the California Highway Patrol. At least one lane was blocked after the crash, and an ambulance was requested for injuries, the CHP said.
The collision involved a gray Nissan Maxima, a white Nissan Altima and a semi-truck, according to CHP dispatch records. The vehicles came to rest in a way that blocked traffic, and a request was made for backup units to help manage the scene.
CHP logs show the crash was reported around 4:44 a.m. The extent of injuries has not been released. It is not known how many people were in each vehicle or whether the roadway has since reopened.
No further details, including a possible cause, have been made public. The CHP has not said whether any citations have been issued. The investigation is ongoing.
We hope everyone who was hurt makes a full and speedy recovery.
How Investigators Piece Together a Multi-Vehicle Truck Crash
Crashes involving a semi-truck typically take longer to clear and longer to explain than a routine two-car collision. Officers first have to secure the scene, treat anyone who is hurt, and get traffic moving safely around a truck that may be too large or too damaged to move quickly. Only after that does the work of figuring out what happened begin.
Reconstruction specialists often measure skid marks, photograph vehicle positions, and pull data from a truck's electronic control module, which can record speed and braking in the moments before impact. Investigators may also request dashcam or nearby surveillance footage and interview witnesses separately so their accounts can be compared. None of this happens instantly, and agencies generally hold back names until next of kin have been notified.
When a death or serious injury is involved, toxicology results can take several weeks to come back from a lab, and a final written report often waits on all of that testing plus input from the trucking company and insurers. That delay is routine, not a sign that something is being withheld.
According to the National Highway Traffic Safety Administration, 28,595 large-truck occupants were injured in multi-vehicle crashes involving large trucks in 2023.
Frequently Asked Questions
What makes truck accidents more dangerous than car crashes?
A loaded semi can weigh 20 to 30 times more than a passenger car, so the smaller vehicle absorbs far more of the force in a collision. Stopping distances are also longer for trucks, which gives drivers less time to react.
What are a truck's blind spots and why do they matter?
Large trucks have wide no-visibility zones along both sides, directly behind the trailer, and close in front of the cab. A car that lingers in one of these areas may be invisible to the driver, which is a factor in many lane-change and merging crashes.
What is an underride crash?
An underride crash happens when a smaller vehicle slides partly or fully beneath a truck's trailer, often because the trailer's underride guard fails or is absent. These crashes can cause severe injuries because the car's safety cage is bypassed.
What are common causes of large-truck accidents?
Driver fatigue, following too closely, blind-spot lane changes, mechanical failure such as brake problems, and poor weather or road conditions are frequently cited factors in large-truck crashes.
What to Do After a Truck Crash in Riverside, CA
If you're involved in a crash with a semi-truck, call 911 right away and move to a safe spot if you're able to. Even if you feel fine, get checked by a medical provider, since injuries from a truck collision can take hours or days to show symptoms.
Try to take photos of all vehicles involved, the road, and any visible damage if it's safe to do so, and get the names and contact information of any witnesses. Remember to ask for the CHP incident number so you can follow up for a copy of the report once it's completed. Keep records of any medical visits connected to the crash for your own files.
