Downey Truck Accident Lawyer: Big Rigs, Federal Records and Who Pays

A crash with a semi or another commercial truck in Downey is a different claim from a fender-bender between two cars. A trucking company is usually involved, federal safety rules apply, the insurance is often larger, and some of the most useful evidence sits on the truck's own computers, where it can be overwritten. This page covers what's specific to truck claims around Downey's freeways.

Saeedian Law Group represents people hurt in truck crashes in Downey. The firm has no office in Downey. Cases are handled from the headquarters on Wilshire Boulevard in Beverly Hills, roughly 23 miles by car, with two more offices in Encino and Rancho Cucamonga. A first consultation costs nothing. Most people start with a phone call, and if the trip to Beverly Hills is hard after an injury, staff will travel to meet you.

Why so many big rigs pass through Downey

Downey sits where three freight freeways meet. The I-5 runs along its northeast side, the I-605 along its east side, and the I-105 cuts across its south end. A few miles west runs the I-710, the truck route out of the Ports of Los Angeles and Long Beach. LA Metro's 2024 corridor plan says it carries nearly 40,000 heavy-duty trucks a day. The Port of Los Angeles alone moved 10.3 million container units (TEUs) in 2024. The I-710 meets the I-105 in Lynwood and the I-5 in Commerce, so port trucks heading east or north often end up on Downey's stretch of freeway.

Caltrans counts trucks on each segment. Its 2024 truck traffic table lists these daily averages near Downey:

Trucks with five or more axles are mostly tractor-trailers, the vehicles people mean when they say "big rig." On the I-105 through Downey, more than half of all trucks counted were in that class.

What Downey's truck crash records show

We pulled every 2024 Downey collision from the California Crash Reporting System and matched each one to the vehicles involved. Truck-tractors, two-axle and three-axle trucks, and tank trucks were part of 125 reported crashes. Thirty-five of those injured someone, 48 people in all. Truck-tractors (the cab of a semi) were in 70 of the 125. In 2023 the count was almost the same: 122 truck-involved crashes, 39 with injuries.

The pattern is specific to big vehicles:

• 85 of the 125 happened on a freeway. The I-5 was named in 41, the I-605 in 30 and the I-105 in 25. Lakewood and Florence were the busiest surface streets.
• 60 were sideswipes, the most common type by far.
• The reporting officer's main cause was an unsafe lane change (Vehicle Code 22107) in 42 crashes and a failure to stay in one lane (Vehicle Code 21658(a)) in 19 more.
• 94 of the 125 happened between 6 a.m. and 6 p.m., when freight traffic is heaviest.

Sideswipes and lane-change crashes with a trailer often turn on blind spots, mirror checks and what the truck's camera recorded. These are records the carrier holds, not you. That's the main reason to move quickly.

What makes a truck claim different

A car claim usually involves two drivers and two insurers. A truck claim can involve a company that employs the driver, a company that leased the truck, a broker who arranged the load, a shipper who packed the trailer and a shop that serviced the brakes. Federal rules in Title 49 of the Code of Federal Regulations set what each of them had to do. Those rules also decide which records exist and how long anyone has to keep them.

California adds its own rules on top. Vehicle Code 22406 limits trucks with three or more axles, and any vehicle towing a trailer, to 55 mph. Cars on the same freeway can usually go faster, so on the I-605 and I-5 trucks are passed, and cut in front of, all day long.

Records that can prove a truck case, and how long they last

Hours-of-service rules matter in almost every case. Under 49 CFR 395.3, a property-carrying driver may drive up to 11 hours after 10 hours off duty, may not drive past the 14th hour on duty, and needs a 30-minute break after 8 hours of driving. On-duty time is capped at 60 hours in 7 days or 70 hours in 8. The ELD records each change of duty status. Drivers who stay inside California follow a state version (13 CCR 1212.5) that allows 12 hours of driving and bars driving after the 16th hour on duty.

The engine control module, often called the truck's black box, can hold speed, braking and throttle data from the seconds before a crash. No federal rule says how long a carrier must keep that data, and it can be lost when the truck goes back into service. Many trucks also carry forward-facing or driver-facing cameras. For both, a preservation letter sent to the carrier soon after the crash is the usual step. It puts the company on notice that the evidence matters to a claim. If a party intentionally destroys or hides evidence, California's standard jury instruction (CACI 204) lets jurors infer that the evidence would have hurt that party. Our article on what a truck's black box records goes into more detail.

Who can be held responsible

Liability depends on the facts. These are the parties a truck claim usually looks at:

• The driver, for speed, lane changes, fatigue, phone use or impairment.
• The motor carrier, which is responsible for its driver and for hiring, training, hours and maintenance. When a carrier leases a truck from an owner-operator, 49 CFR 376.12 requires the lease to say the carrier has exclusive possession, control and use of the equipment and takes complete responsibility for its operation.
• A freight broker that arranged the load. In May 2026 the U.S. Supreme Court held in Montgomery v. Caribe Transport II that federal law does not block a state-law claim that a broker carelessly hired an unsafe carrier. The claim still has to be proved on the facts.
• The shipper or loader, if cargo was overloaded or badly secured and shifted.
• A maintenance vendor, if a repair shop's brake or tire work failed.
• A public agency, if a Caltrans road condition or a city-owned truck played a part. Claims against public entities have a six-month filing window (Government Code 911.2).

California's pure comparative fault rule applies, and each defendant pays non-economic damages in proportion to its own share of fault (Civil Code 1431.2). That's why it matters to name every party with real responsibility rather than only the driver.

How much insurance a truck has to carry

Interstate for-hire carriers hauling general freight in trucks of 10,001 pounds or more must carry at least $750,000 in liability coverage under 49 CFR 387.9. The minimum rises to $1,000,000 for oil and to $5,000,000 for some hazardous materials. Many carriers carry more.

Trucks that only operate inside California fall under state rules. These carriers need a CA number from the CHP and a Motor Carrier Permit from the DMV. Vehicle Code 34631.5 sets their minimum at $750,000 for most property carriers, or $300,000 if the carrier runs only vehicles under 10,000 pounds and hauls no hazardous material.

To find a carrier, write down the USDOT number painted on the cab door. You can look it up on FMCSA's public SAFER system, which lists the company's name, address and whether it operates interstate.

Who investigates a serious truck crash in Downey

On the I-5, I-605 and I-105, the CHP takes the report. Surface-street crashes in Downey usually go to the Downey Police Department. Our Downey car accident page explains how to order either report.

When a commercial vehicle is involved in a fatal crash, CHP policy allows a callout of its Multidisciplinary Accident Investigation Team (MAIT). One team is based in the CHP's Southern Division in Los Angeles. Each team includes officers, a Caltrans engineer and a motor carrier specialist who inspects the vehicles mechanically. A MAIT callout isn't automatic, but when one happens, its report is usually the most detailed account of the crash.

The first ten days after a truck crash

1. Photograph the cab door (carrier name and USDOT number), the trailer number and the license plates on both.
2. Get the report number from the officer, and note whether it was CHP or Downey PD.
3. Get medical care and keep every record. Truck crashes often cause injuries that show up days later.
4. Write down the lane you were in, which way the truck moved and where you think its mirrors and blind spots were.
5. Hold off on signing releases or recording a statement for the trucking company's insurer until you've had advice.
6. Ask a lawyer about a preservation letter for the ELD, black box and camera data. The sooner it goes out, the less risk the data is gone.
7. Calendar the deadlines. A lawsuit for injuries generally has to be filed within two years (Code of Civil Procedure 335.1), and a claim against a public entity within six months.

If a family member died in a truck crash, the claim is a wrongful death case, with its own rules on who may sue. See our California wrongful death page.

The attorneys behind this page

Michael Saeedian started the firm in 2009 and has held a California law license since December 2, 2009 (State Bar No. 265470). UCLA gave him his undergraduate degree; his J.D. is from Loyola Law School. He belongs to the Consumer Attorneys Association of Los Angeles, and his practice is personal injury and wrongful death, including truck crashes. Daniella Saeedian joined the California bar in 2019 and takes truck accident cases as well.

Fees are contingent on a recovery. In the words of the firm's About page, you owe nothing until we recover compensation for you.

Call about a Downey truck crash

Call 310.288.3000. We're available by phone 24 hours a day, or you can send the contact form. There's no charge for that first talk and no obligation afterward.

If the crash happened somewhere else in LA County, our Los Angeles truck accident page is the better fit. The California truck accident guide covers statewide rules at greater length.

Truck crash questions from Downey

I drive a truck for a living and another driver hit me. Can I bring a claim?

Often, yes. If you were hurt on the job, workers' compensation usually covers you through your employer. If someone outside your company caused the crash, such as another motorist or a different carrier, you may also have a separate claim against them. The two systems interact, so get advice before you settle either one.

The cab had one company's name and the trailer had another. Who is responsible?

That's common with leased equipment and drop trailers. The company whose USDOT number is on the power unit is usually the carrier in charge of the trip. The trailer owner, a broker or the shipper may also be part of the claim. The bill of lading and the lease agreement settle who did what.

How do I find out what insurance the truck had?

Start with the USDOT number on the cab door and FMCSA's SAFER lookup. The crash report usually lists the carrier's insurer too. The exact policy limits normally come out once a claim is opened or a lawsuit is filed.

Was the truck driver drug tested after my crash?

Federal rules require post-crash testing when someone died. They also require it when the driver was cited and someone was hurt badly enough to be treated away from the scene, or a vehicle was damaged badly enough that it had to be towed away. The carrier keeps the results, and a lawyer can request them.

Does the truck's black box show what happened?

It can show speed, braking and throttle in the seconds before impact. It doesn't show everything, and it can be lost. That's why a written preservation request should go to the carrier early.

Where would I meet with you?

Usually by phone at first. You can come to the Beverly Hills office, and when getting there isn't practical because of your injuries, a staff member can travel to you instead.

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Attorney Advertising. This page gives general information and is not legal advice. Reading it or contacting the firm does not create an attorney-client relationship. Past results do not guarantee future outcomes. Responsible attorney: Michael Saeedian, Saeedian Law Group, 9100 Wilshire Blvd, Suite 500W, Beverly Hills, CA 90212. Truck volumes: Caltrans 2024 Truck AADT. Crash counts: California Crash Reporting System 2023 and 2024 data via data.ca.gov, retrieved November 7, 2026.