Who Is Liable After a Multi-Car Accident on San Diego’s I-15? A Trusted California Personal Injury Lawyer Explains

Posted on: June 26th, 2026 by Pajman Jassim

A Trusted California Personal Injury Lawyer Explains Multi-Car Accident Liability

A recent multi-vehicle collision on southbound Interstate 15 near Miramar caused significant traffic delays after several vehicles became involved in a chain-reaction crash. Emergency responders temporarily shut down multiple lanes while assisting victims, investigating the collision, and clearing the roadway. Although traffic eventually reopened, the accident serves as another reminder of how quickly a routine commute can become a life-changing event.  Learn more about multi-car accident liability from a trusted San Diego attorney.

By Pajman Jassim, San Diego’s Trusted Personal Injury Attorney

Just before 3:00 a.m. on Friday, June 26, 2026, a serious multi-vehicle collision shut down lanes on southbound Interstate 15 near the State Route 78 interchange in Escondido. According to the California Highway Patrol, the crash involved a Ford Bronco, a BMW, and a semi-truck. The Bronco overturned, and one occupant was initially trapped before safely escaping. The collision scattered debris across the freeway, prompted a SigAlert, and required emergency medical personnel to respond while crews worked to clear the wreckage and reopen the roadway. Incidents like this demonstrate how crashes involving multiple vehicles—especially commercial trucks—can quickly become legally complex, making a thorough investigation essential to determine liability and protect the rights of injured victims.

At Jassim Law, we frequently represent victims injured in complex, multi-party motor vehicle collisions throughout San Diego County. These crashes often involve multiple insurance companies, disputed liability, conflicting witness statements, and catastrophic injuries. Understanding your legal rights immediately after a chain-reaction accident is essential to protecting your health and your financial future.

Why Multi-Party Accidents Are So Complex | Multi-Car Accident Liability

Unlike a typical two-car collision, multi-vehicle crashes may involve three, four, or even a dozen vehicles. One driver’s negligence can trigger a domino effect that causes additional impacts involving completely innocent motorists.

Common causes include:

• Distracted driving
• Speeding
• Following too closely
• Sudden lane changes
• Driving too fast for traffic conditions
• Impaired driving
• Commercial truck negligence
• Unsafe roadway conditions

On busy freeways such as Interstate 15, Interstate 5, Interstate 805, and State Route 163, vehicles often travel at highway speeds with little room to avoid sudden hazards. One rear-end collision can quickly escalate into a pileup involving numerous vehicles.

Determining Who Is At Fault | Multi-Car Accident Liability

One of the biggest misconceptions about chain-reaction crashes is that the last driver is automatically responsible.

California law is rarely that simple.

Instead, investigators examine numerous factors, including:

• California Highway Patrol reports
• Vehicle damage patterns
• Event Data Recorder (“black box”) information
• Dash camera footage
• Surveillance video
• Eyewitness testimony
• Cell phone records
• Vehicle speed calculations
• Skid marks and roadway evidence
• Accident reconstruction analysis

Multiple drivers may each share a percentage of responsibility.

For example:

• Driver A suddenly brakes without reason.
• Driver B follows too closely and rear-ends Driver A.
• Driver C is distracted by a cellphone and crashes into Driver B.
• Driver D is speeding and cannot stop in time.

Each driver’s actions may contribute differently to the overall collision.

California’s Comparative Negligence Rule

California follows a pure comparative negligence system.

This means more than one person can be legally responsible for causing an accident.

Even if an injured victim is partially at fault, they may still recover compensation. Their financial recovery is simply reduced by their percentage of fault.

For example:

• Total damages: $500,000
• Victim found 20% responsible
• Recoverable compensation: $400,000

This makes accurately determining fault extremely important.

Common Injuries in Multi-Vehicle Crashes

Chain-reaction collisions frequently produce severe injuries because victims may be struck multiple times from different directions.

Common injuries include:

• Traumatic brain injuries (TBI)
• Spinal cord injuries
• Herniated discs
• Neck injuries
• Whiplash
• Broken bones
• Internal bleeding
• Facial fractures
• Crush injuries
• Permanent disability

Even low-speed secondary impacts can create significant medical complications.

Commercial Vehicles Increase the Stakes | Multi-Car Accident Liability

Many Interstate 15 collisions involve:

• Semi-trucks
• Delivery vans
• Construction vehicles
• Fleet vehicles
• Rideshare drivers

Commercial crashes introduce additional legal issues.

Potentially liable parties may include:

• Truck drivers
• Trucking companies
• Vehicle maintenance contractors
• Cargo loading companies
• Vehicle manufacturers

Federal trucking regulations may also become relevant when investigating driver fatigue, maintenance records, hours-of-service violations, or unsafe loading practices.

Insurance Companies Often Shift Blame

After a multi-party collision, victims frequently receive calls from several insurance adjusters.

Each insurance company has one goal:

Reduce its own financial exposure.

Insurers may argue:

• Another driver caused the crash.
• Your injuries existed before the accident.
• Your medical treatment was unnecessary.
• You share responsibility.
• Someone else should pay first.

Without experienced legal representation, injured victims often become caught in disputes between multiple insurance carriers.

Critical Evidence Can Disappear Quickly

Evidence following a freeway collision is often removed within hours.

This may include:

• Tire marks
• Vehicle positions
• Road debris
• Surveillance footage
• Electronic vehicle data

An experienced personal injury attorney can immediately send preservation letters requesting that critical evidence not be destroyed.

This is especially important when commercial vehicles or government agencies may possess valuable information.

What Compensation May Be Available?

Victims injured in multi-party crashes may recover compensation for:

• Emergency medical treatment
• Hospital bills
• Future medical care
• Physical therapy
• Lost wages
• Reduced earning capacity
• Pain and suffering
• Emotional distress
• Property damage
• Permanent disability
• Loss of enjoyment of life

Every case is unique, and compensation depends on the severity of injuries, available insurance coverage, and each party’s percentage of fault.

What Should You Do After a Chain-Reaction Accident?

If you are physically able:

1. Call 911 immediately.
2. Obtain medical treatment, even if injuries seem minor.
3. Photograph all vehicles and the accident scene.
4. Exchange information with every driver involved.
5. Speak with responding CHP officers.
6. Collect witness contact information.
7. Avoid admitting fault.
8. Notify your insurance company.
9. Contact an experienced personal injury attorney before giving recorded statements.

Prompt medical treatment also creates documentation linking your injuries to the collision.

How Pajman Jassim Helps Multi-Party Accident Victims

According to Pajman Jassim, determining liability in a multi-vehicle collision requires far more than reviewing a police report.

“Multi-party freeway crashes often involve overlapping negligence, conflicting insurance positions, and extensive accident reconstruction. Our job is to uncover exactly what happened, preserve critical evidence, and aggressively pursue every available source of compensation so our clients can focus on healing.”

At Jassim Law, we work with:

• Accident reconstruction experts
• Medical specialists
• Economists
• Vocational experts
• Highway safety professionals

Our goal is to build the strongest possible case while maximizing the compensation our clients deserve.

Act Now!  Injured in a Multi-Vehicle Accident? Call Jassim Law

If you or someone you love was injured in a chain-reaction accident on Interstate 15, Interstate 5, Interstate 805, or anywhere in San Diego County, don’t assume the insurance companies will fairly determine who is responsible.

Multi-party accidents require immediate investigation, experienced legal analysis, and aggressive representation.

At Jassim Law, attorney Pajman Jassim has extensive experience helping accident victims navigate complex liability disputes involving multiple drivers and insurance companies. We are committed to protecting your rights and pursuing the maximum compensation available under California law.

Contact Jassim Law today for a free consultation to discuss your case and learn how we can help you move forward after a serious multi-vehicle collision.

*This article was inspired by a recent multi-vehicle crash that temporarily closed southbound Interstate 15 near Miramar, highlighting the serious legal and safety issues that often arise after chain-reaction freeway accidents.