One Hospitalized After Multi-Vehicle Crash Involving Two Semi-Trucks on I-5 in Sylmar
One person was hospitalized Sunday morning, September 6, 2026, after a multi-vehicle collision involving semi-trucks and passenger vehicles on the southbound 5 Freeway in the north San Fernando Valley. The crash occurred near the San Fernando Mission Boulevard off-ramp and caused significant lane closures while emergency crews and the California Highway Patrol responded.
At least one of the vehicles reportedly overturned during the collision. The cause of the crash had not been publicly determined in the initial reporting.
DAG Law Firm, APC represents people seriously injured in truck accidents throughout California, including crashes involving semi-trucks, tractor-trailers, commercial vehicles, and multiple vehicles. We handle qualifying personal injury matters on a contingency fee basis, which means there are no upfront attorney fees and you do not pay attorney fees unless we win your case. Call (323) 930-2020 to discuss your situation.
What Happened on the 5 Freeway Near San Fernando Mission Boulevard?
According to MyNewsLA, citing the California Highway Patrol, the collision occurred at approximately 6:45 a.m. Sunday on the southbound Golden State Freeway near the San Fernando Mission Boulevard off-ramp. CHP-attributed reporting said the crash involved two semi-trucks and two other vehicles, with at least one vehicle overturning during the collision.
The Los Angeles Fire Department reported that its first-arriving unit encountered a collision involving a passenger vehicle and a semi tractor-trailer that blocked multiple southbound lanes. CHP temporarily closed the freeway entrance at San Fernando Road while emergency crews responded and worked to manage the scene.
MyNewsLA reported that one person was transported to Dignity Health-Northridge Hospital Medical Center. The person’s condition was not immediately available, and at least two southbound freeway lanes remained blocked later that morning.
The cause of the collision had not been publicly determined in the initial reporting. Nothing in the currently available information establishes who caused the September 6 crash or whether any particular truck driver, passenger-vehicle driver, trucking company, or other party bears civil responsibility.
Why Multi-Vehicle Semi-Truck Crashes Can Be Complicated
A collision involving commercial trucks can present issues that are not always present in an ordinary two-car accident. Semi-trucks are substantially larger and heavier than passenger vehicles, and when several vehicles are involved, investigators may need to reconstruct a series of impacts to determine how the crash unfolded.
Important questions may include the speed and direction of each vehicle, lane changes or merging activity, following distance, driver attention, braking, visibility, traffic conditions, and the sequence of impacts. Investigators may also examine driver fatigue, truck maintenance, brake and tire condition, cargo loading, electronic vehicle information, dashcam footage, witness statements, and other records relevant to the collision.
The presence of a semi-truck does not automatically mean that a commercial driver or trucking company caused the crash. Responsibility must be determined from the evidence and the circumstances surrounding each vehicle’s involvement.
In a multi-vehicle collision, more than one person may potentially contribute to what occurred. An initial impact can cause another vehicle to overturn, enter a different lane, or strike surrounding traffic, making it important to identify which impacts occurred first and which collision caused a particular injury.
Learn more about DAG Law Firm’s California truck accident representation.
Trucking Records and Other Evidence That May Be Important
Commercial truck accidents can generate evidence that may not exist in an ordinary passenger-vehicle case. Depending on the truck and company involved, potentially relevant information can include electronic logging device records, driver qualification information, hours-of-service records, inspection and maintenance documents, dispatch records, GPS or telematics data, engine-control information, dashcam footage, and cargo-related documents.
Passenger vehicles may also contain electronic data that can help investigators evaluate speed, braking, acceleration, and other activity immediately before an impact. When several vehicles are involved, this information may be considered alongside physical damage, roadway evidence, witness accounts, photographs, and video to help reconstruct the sequence of events.
Other useful evidence may include police reports, photographs of the vehicles and roadway, tire or skid marks, debris, surveillance recordings, medical records, and statements from people who witnessed the crash. Nearby businesses or other motorists may also have video showing what happened before or during the collision.
Preserving evidence promptly can be particularly important when a commercial vehicle is involved. Trucks may be repaired or returned to service, physical evidence may change, and some electronic or company records may only be retained for limited periods. Identifying the company operating the truck and preserving potentially relevant records can therefore become an important part of an investigation.
Potential Responsibility and Insurance After a Truck Accident
Depending on how a commercial truck collision occurred, an investigation may consider the conduct of truck drivers, passenger-vehicle drivers, trucking companies, employers, tractor or trailer owners, maintenance providers, cargo-loading companies, and other businesses connected to the commercial vehicle. The fact that a company is connected to a truck does not automatically establish liability, and each potentially responsible party must be evaluated based on the evidence.
Insurance issues can also become more complicated in a truck accident than in a typical passenger-vehicle collision. Commercial vehicles may involve separate insurance policies and different sources of coverage, particularly when the driver, tractor, trailer, cargo, or employer involve different companies.
People injured in multi-vehicle crashes should therefore avoid assuming that the first insurance company to contact them represents every potentially responsible party. It may take additional investigation to identify which companies and policies are connected to the vehicles involved.
California personal injury lawsuits generally must be filed within two years of the injury, although exceptions may shorten or extend the applicable period. Claims involving a government or public entity can require action much sooner, sometimes including presentation of a claim within six months, while important evidence such as video, electronic records, and trucking documents may disappear long before any formal filing deadline.
What to Preserve After a Serious Truck Accident
Medical care should come first after a serious collision. Once the immediate emergency has passed, preserving information related to the crash and resulting injuries may help document what occurred.
Useful materials can include the police report or incident number, photographs and video of the vehicles, dashcam footage, witness contact information, medical records and bills, photographs of visible injuries, documentation of missed work or lost income, and insurance communications. Information identifying the truck, trailer, driver, and trucking company may also become important when evaluating potential claims.
Injured people should also use care before signing broad releases or settlement documents without understanding which claims or parties may be affected. This can be especially important in a commercial truck case where several companies or insurance policies may ultimately be involved.
Evidence may become harder to obtain as time passes. Vehicles may be repaired, video can be overwritten, and business records may no longer be readily available, making early investigation and preservation particularly important after a serious multi-vehicle truck crash.
How DAG Law Firm Can Help After a Serious Truck Accident
A multi-vehicle collision involving commercial trucks can require a detailed investigation of the drivers, vehicles, trucking companies, insurance coverage, electronic records, physical evidence, and sequence of impacts. Evaluating those materials can help determine how the crash occurred and whether one or more parties may bear legal responsibility.
DAG Law Firm, APC represents people seriously injured in qualifying truck accidents throughout California. Learn more about our California truck accident practice and our guide to who may be liable after a California truck accident.
If you or someone you love has suffered a serious injury in a collision involving a semi-truck or other commercial vehicle, call (323) 930-2020 to discuss the circumstances.
You do not pay attorney fees unless we win your case. DAG Law Firm handles qualifying personal injury matters on a contingency fee basis with no upfront attorney fees.
This article is based on preliminary information from the Los Angeles Fire Department and California Highway Patrol-attributed reporting concerning the September 6, 2026 collision. The cause remains under investigation, and reported facts may change as additional information becomes available. Nothing in the currently available information establishes that a truck driver, trucking company, passenger-vehicle driver, or any other party acted negligently or bears civil responsibility. DAG Law Firm, APC does not represent anyone identified in the reports and makes no independent assertion regarding fault or liability. This article is attorney advertising and is provided for general informational purposes only.
