Written by Ali Razavi

Every week, I speak with people in Santa Ana who were badly hurt in truck crashes they never saw coming. A loaded 18-wheeler hitting a passenger car at freeway speed is not like a fender bender — the physics are completely different, the injuries are worse, and the legal questions multiply fast. Who owned the truck? Who loaded the cargo? Was the driver complying with federal hours-of-service rules? These cases are layered in ways that ordinary car accident claims are not.

This post lays out the highways where these crashes happen most often near Santa Ana, the injuries we see most frequently, the federal rules that govern carriers operating in California, the common causes of 18-wheeler crashes, how the FMCSA actually regulates the industry, and what California’s AB 5 law means for driver liability. If you’ve already been in a crash, or if you just want to understand your rights before one happens, read through this carefully.

At Razavi Law Group, we handle truck accident cases for clients throughout Orange County and across California. Our Santa Ana office is located at 2090 N Tustin Ave #250, Santa Ana, CA 92705, United States, and you can reach us at (949)-694-3760.

What Are the Most Dangerous Highways in California for Truck Accidents in Santa Ana?

The corridors around Santa Ana carry some of the heaviest commercial truck traffic in Southern California, and that volume directly produces crashes.

Interstate 5 (the Santa Ana Freeway) runs directly through the city and connects the ports of Los Angeles and Long Beach to distribution centers throughout Orange County and beyond. The stretch through Santa Ana and the interchange with I-405 sees constant heavy truck movement. Merge conflicts, sudden speed changes near the interchange, and stop-and-go conditions near the downtown connector make this segment particularly dangerous.

Interstate 405 (the San Diego Freeway) carries massive freight volume between Los Angeles and Orange County. The I-405/I-605 interchange area and the section near the I-5 split are consistently cited by the California Highway Patrol in crash data as high-frequency commercial vehicle accident zones. Wide-load carriers and flatbeds hauling construction materials use this corridor heavily.

State Route 55 (the Costa Mesa Freeway) runs through the heart of Santa Ana and into Anaheim. It connects to SR-91 to the north and serves as a major surface-level freight route for local deliveries. Because it passes through residential and commercial corridors with many on/off ramps and at-grade intersections, it generates a significant number of truck-involved crashes at lower speeds — which still cause serious injuries when a pedestrian or cyclist is involved.

State Route 91 (the Riverside Freeway) feeds truck traffic from the Inland Empire into Orange County. Warehousing and logistics operations in Riverside and San Bernardino counties send a high volume of distribution trucks westbound on SR-91 through Anaheim into Santa Ana every day. The grade changes on the eastern end contribute to brake failures and runaway truck incidents.

Interstate 710 (the Long Beach Freeway), though it terminates north of Santa Ana near Alhambra, funnels port-originating commercial freight that eventually reaches SR-91 and I-5. Trucks coming off the Port of Long Beach on I-710 are often overloaded or improperly secured, and by the time they reach Orange County corridors, fatigued drivers and mechanical stress from the port approach add to the risk.

In my experience handling cases originating from these routes, the I-5/I-405 interchange is where we most often see multi-vehicle pile-ups involving trucks. The traffic density there is unforgiving, and when a truck driver misjudges stopping distance, the results are catastrophic.

What Injuries Are Most Common in California Truck Accidents?

The weight difference between an 80,000-pound loaded semi and a 4,000-pound passenger car explains most of what we see on the injury side.

Traumatic brain injuries (TBIs) show up in a significant portion of the cases I’ve worked. The sudden deceleration when a smaller vehicle is struck by a truck causes the brain to move inside the skull even when there’s no visible head wound. Some clients come to me walking and talking but later discover they have moderate TBIs that affect memory, concentration, and mood for years.

Spinal cord injuries — including partial and complete paralysis — are common in side-impact and rear-end truck collisions. The forces involved at freeway speeds frequently cause burst fractures and herniated discs severe enough to require surgery. In the worst cases, permanent paralysis results.

Crush injuries to the lower extremities are nearly specific to truck accidents. When the front end of an 18-wheeler overrides a passenger vehicle, the legs and pelvis absorb the brunt. Amputations, compartment syndrome, and shattered bones that require multiple reconstructive surgeries are not unusual in these cases.

Internal organ damage — spleen lacerations, liver damage, pneumothorax — frequently goes undiagnosed at the scene because the victim may be conscious and not immediately show signs of internal bleeding. I always advise clients to go to the emergency room even when they feel relatively okay after a crash. Delayed diagnosis of internal injuries has cost people their lives.

Burn injuries occur when fuel tanks rupture and ignite, which happens more often in truck accidents than in standard car crashes because of the fuel capacity involved.

Wrongful death is the tragic outcome in too many of these cases. When a family loses someone to a truck crash, the available claims — and who can bring them — are governed by California’s wrongful death statutes, and the process is distinct from a personal injury claim brought by a survivor.

What Federal Trucking Regulations Apply to Accidents in California?

Interstate motor carriers — meaning trucking companies that cross state lines — are subject to Federal Motor Carrier Safety Administration (FMCSA) rules regardless of where in California the crash happens. These rules exist alongside California state law, and both bodies of regulation can be relevant in a single case.

The FMCSA regulations under 49 CFR Parts 300-399 cover driver qualifications, vehicle maintenance, hours of service, cargo securement, and insurance. A few of the most important provisions for accident cases:

49 CFR Part 391 sets minimum driver qualification standards. Drivers must hold a valid commercial driver’s license (CDL), pass a medical examination, and meet vision, hearing, and physical fitness standards. When a driver who didn’t meet these standards caused a crash, the hiring carrier faces direct liability exposure for negligent entrustment.

49 CFR Part 395 governs hours of service. The rules limit how long a commercial driver can be on duty and behind the wheel before mandatory rest. I regularly see violations here — electronic logging device (ELD) data showing that a driver exceeded allowable limits before a crash. Under 49 CFR 395.8(k)(1), carriers must retain records of duty status and supporting documents for at least six months, which is a critical window for evidence preservation. If you wait too long to act, that data may be gone.

49 CFR Part 392 covers safe driving practices — cell phone use, speed limits, following distance, and the obligation to inspect the truck before each trip.

49 CFR Part 393 requires that cargo be properly secured. Unsecured loads that shift or fall off a truck and cause crashes are a direct regulatory violation.

49 CFR Part 387 mandates minimum liability insurance for interstate carriers. Under 49 CFR 387.9, a for-hire interstate motor carrier hauling general freight must carry at least $750,000 in public liability coverage. Carriers transporting certain bulk hazardous materials must carry $5,000,000. These are required minimums — they are not caps on what an injured person can recover.

A California-only delivery operation — one that never crosses state lines — may be regulated primarily by the California Highway Patrol and the California DMV rather than the FMCSA. That distinction matters when building a case.

What Are the Most Common Causes of 18-Wheeler Accidents in California?

Based on cases I’ve handled and the FMCSA’s own large truck crash causation studies, several factors appear repeatedly.

Driver fatigue is the most pervasive problem. The hours-of-service rules exist specifically because fatigued driving is as dangerous as drunk driving at comparable impairment levels. Routes that connect Southern California distribution centers to Northern California warehouses are particularly prone to this — drivers pushing to complete long hauls and cutting into mandatory rest periods.

Distracted driving — primarily cell phone use — contributes to a significant share of crashes. Federal rules prohibit commercial drivers from using handheld devices while driving, but enforcement depends on after-the-fact investigation of phone records and ELD data.

Inadequate vehicle maintenance causes brake failures, tire blowouts, and steering defects. California’s heavy truck corridors put enormous wear on braking systems. When a truck’s brakes are not maintained to standard and the truck can’t stop in time, the carrier and maintenance provider can both be exposed to liability.

Improper cargo loading shifts the center of gravity of a trailer, causing rollovers on curves or during lane changes. I’ve worked cases where cargo loaded by a third-party warehouse company contributed directly to a crash, making that company a potentially responsible party alongside the carrier.

Driver inexperience or inadequate training is increasingly a factor as the trucking industry faces driver shortages. Carriers sometimes hire and deploy drivers before they’re fully prepared to handle adverse conditions on California’s freeways.

Speeding and aggressive driving — particularly on I-5 and I-405 where trucks are under delivery time pressure — produces rear-end and sideswipe collisions with cars.

Impaired driving involving alcohol or controlled substances, while less common than fatigue, does occur and produces severe crashes.

It’s worth noting that responsibility in a truck accident case is rarely limited to the driver. Depending on the facts, potentially responsible parties can include the carrier, the vehicle owner, the maintenance provider, the cargo loader, and the freight broker. Determining who bears responsibility requires investigation — it is never automatic.

How Does the FMCSA Regulate Trucking Companies Involved in Accidents in California?

The FMCSA operates the Safety Measurement System (SMS), which scores carriers on the basis of inspection results, crash data, and violations. Carriers with high SMS scores in categories like unsafe driving, hours-of-service compliance, and vehicle maintenance can be flagged for investigation or placed out of service.

Before a carrier can operate legally in interstate commerce, it must register with the FMCSA and obtain a USDOT number. The agency maintains a publicly accessible database — the FMCSA’s SAFER system — where anyone can look up a carrier’s inspection history, crash record, and out-of-service orders. When I’m building a case, this is one of the first places I look. A carrier with a pattern of hours-of-service violations that then has a fatigue-related crash is a carrier with a significant liability problem.

The FMCSA can conduct compliance reviews, audits, and roadside inspections. Inspectors from the California Highway Patrol participate in roadside inspections under the North American Standard Inspection Program, which means California enforcement officers are directly involved in federal compliance monitoring.

Carriers that fail compliance reviews can face civil penalties, corrective action plans, or orders to cease operations. These regulatory records become evidence in litigation. If a carrier was cited for brake maintenance violations six months before a brake failure caused your crash, that history matters.

The FMCSA also regulates electronic logging devices. Since the federal ELD mandate took full effect, carriers must use approved devices to record hours of service automatically. This has made it harder to falsify logs and easier for attorneys to obtain accurate driving records after a crash. You can review current FMCSA rules and enforcement priorities through the agency’s official portal, and FindLaw and Justia both maintain accessible summaries of the federal regulations that govern these carriers.

What Are California AB 5 Laws and How Do They Affect Truck Driver Liability in Accidents?

California Assembly Bill 5, which took effect in January 2020 and has been the subject of ongoing legal battles since, directly affects how courts and attorneys analyze liability in truck accident cases.

AB 5 established a strict “ABC test” for determining whether a worker is an employee or an independent contractor. Under this test, a worker is presumed to be an employee unless the hiring company can prove all three of the following: (A) the worker is free from the control and direction of the hiring entity in performing the work; (B) the worker performs work outside the usual course of the hiring entity’s business; and (C) the worker is customarily engaged in an independently established trade, occupation, or business.

For trucking specifically, this matters enormously in crash cases. Many carriers have historically classified drivers as independent contractors to reduce their exposure — arguing they aren’t responsible for a contractor’s negligent driving. AB 5 challenges that classification directly. If a driver who caused your crash was, under the ABC test, actually functioning as an employee despite being labeled a contractor, the carrier may be held liable as an employer for that driver’s acts under the doctrine of respondeat superior.

The trucking industry challenged AB 5 in federal court, arguing federal law preempted it. In 2022, the Ninth Circuit Court of Appeals rejected the preemption argument as applied to the ABC test for motor carriers, and the U.S. Supreme Court declined to hear the challenge in 2023, leaving AB 5 in place for California trucking. As of 2026, AB 5 remains controlling California law for purposes of driver classification.

The practical impact: if a carrier has been misclassifying its drivers as independent contractors, an accident victim has a stronger argument that the carrier bears employer liability for the crash. This can substantially affect which insurance policies apply and the total amount of coverage available. Cornell Law School’s Legal Information Institute provides a clear overview of respondeat superior and vicarious liability doctrine if you want background on how employer liability attaches.

This is an area where I strongly recommend speaking with an attorney early. The classification analysis under AB 5 is fact-specific and the carrier will almost certainly argue the driver was an independent contractor. Building the contrary argument takes documentation and knowledge of how courts have applied the ABC test in post-2020 California cases. The American Bar Association has published resources on the evolving gig economy employment classification litigation that provides useful context.

The Statute of Limitations for Truck Accident Claims in California

Under California Code of Civil Procedure § 335.1, the general deadline to file a personal injury lawsuit is two years from the date of injury. Property damage claims carry a three-year deadline under Code of Civil Procedure § 338.

If a government entity — such as a public agency operating a municipal vehicle — is involved, California Government Code § 911.2 requires a written claim to be filed within six months of the incident. That administrative deadline is separate from and earlier than the two-year lawsuit deadline.

Two years sounds like a long time. It passes quickly when you’re recovering from surgery, dealing with insurance adjusters, and trying to get back to work. Evidence — ELD records, black box data, inspection records — disappears. Witnesses move on. The six-month carrier retention requirement for driver logs under 49 CFR 395.8(k)(1) means that waiting a year to pursue your case may mean that critical records are already gone.

If you have questions about how any of these deadlines apply to your specific situation, contact us directly. We can evaluate your case and make sure nothing is missed.

Talk to a Truck Accident Lawyer in Santa Ana

Truck accident cases are not like car accident cases. The regulatory framework is different, the number of potentially responsible parties is larger, the evidence is more technical, and the insurance coverage questions are more complex. Getting representation from attorneys who specifically handle commercial vehicle cases — not just general personal injury work — makes a real difference.

Razavi Law Group handles truck accident cases throughout California, with a focus on clients in Orange County and the greater Los Angeles area. We work with accident reconstruction experts, review electronic logging records, analyze FMCSA compliance histories, and build the factual record needed to pursue every responsible party — not just the driver.

If you or someone you care about was injured in a truck crash on I-5, I-405, SR-55, SR-91, or anywhere in Southern California, schedule a consultation with our team. There’s no obligation, and we’ll give you a straight answer about what your case involves.

Call us at (949)-694-3760, or visit our Santa Ana office at 2090 N Tustin Ave #250, Santa Ana, CA 92705, United States.

We also handle related practice areas including California personal injury claims, car accident cases, and wrongful death claims for families who have lost someone.