Semi Truck Accident Evidence in Orange County, CA: What to Preserve

By the Sky Law Group Editorial Team · Reviewed by Shakeal Masoud, Esq. (California State Bar No. 246309) · Reviewed November 6, 2026

Short answer: After a crash with a semi truck, the most important proof often sits with the trucking company, not with you: the driver’s logs, the truck’s electronic data, dispatch records and maintenance files. Some of it can be overwritten or discarded on a routine schedule. A lawyer can send the company a written preservation demand early, so the evidence is protected while you recover. Most California injury claims must be filed within two years (CCP §335.1). Call Sky Law Group at (844) 475-9529 — Hablamos Español.

Why semi truck evidence disappears

A car crash is usually a story told by two drivers and a police report. A semi truck crash is different. The truck is run by a business that keeps records, and those records can decide who was at fault. The problem is timing. A company that expects a claim has every reason to protect its records, but a company that treats the crash as routine may let logs, camera footage and engine data be overwritten or repaired away. Drivers and carriers along the I-5, 91, 57, 22 and 405 in Orange County move on to the next load within hours.

What evidence matters in a truck accident claim

• Electronic logging device (ELD) data. Federal rules generally require commercial drivers to record their driving time electronically. These records can show whether a driver was beyond the hours-of-service limits (49 CFR Part 395).
• The truck’s event data recorder or "black box." Many trucks record speed, braking and engine data around a crash.
• Dashcam and camera footage. Some fleets use forward-facing or driver-facing cameras. Video may be recorded over quickly.
• Driver qualification and training files. These can show the driver’s history and how the company hired and supervised the driver.
• Dispatch records, bills of lading and delivery schedules. These can show pressure to deliver on time and what the truck was carrying.
• Maintenance and inspection records. Brakes, tires and lights that were not maintained can point to the company, not just the driver.
• Cell phone and communication records. Messages and calls near the time of the crash can matter.

The preservation letter

A preservation letter, sometimes called a spoliation letter, is a written demand from your lawyer telling the trucking company, the driver and sometimes other parties to keep specific records and the truck itself unchanged. It does not guarantee the company will comply, but it puts them on notice. If important evidence is later destroyed after the notice, that fact can matter in the case. The sooner the letter goes out, the more records it can reach. Retention periods for some driver records can be short, so do not wait to see how your recovery goes before calling a lawyer. (Attorney note: confirm current retention periods under 49 CFR Part 395 and Part 379 before relying on any specific number.)

Who could be responsible

A truck crash claim may involve more than the driver. Depending on the facts, responsibility can reach the trucking company, a company that loaded the cargo, a broker that arranged the shipment, or a business that maintained the truck. Each may have its own insurance, and the answer depends on records that are not public. See our guide on who pays medical bills after a trailer accident and our overview of truck accident claims in Orange County.

What you can do at the scene and in the first days

• Get medical care first. Your health comes before any evidence.
• If you are able, photograph the truck, its DOT number, the company name on the door, license plates, skid marks, road damage and your vehicle from several angles.
• Get the truck driver’s name, the company name and the insurance information, and get names and phone numbers of witnesses.
• Look for cameras at nearby businesses and note where they are. Their footage may also be erased on a short cycle.
• Do not give the trucking company’s insurer a recorded statement before speaking with a lawyer; read why not.
• Do not sign a release or accept a quick offer. Keep all medical records and bills.

For a full timeline of what to do right after a truck crash, read hit by a semi truck in Orange County: the first 48 hours. If the truck was a port or container truck, see our page on port and container truck accidents.

Deadlines that apply

Most California personal injury lawsuits must be filed within two years of the injury (CCP §335.1; see our statute of limitations guide). If the truck belonged to a city, county or other public entity, a written claim is generally required within six months (Gov. Code §911.2). Evidence deadlines can come much sooner than filing deadlines, which is why early contact with a lawyer matters.

Sky Law Group is at 303 W. Katella Ave., Suite 301, in Orange. See our Orange County car accident lawyer page, or call (844) 475-9529 for a free consultation. Se habla español: abogado de accidentes de traila.

Sources

• Federal Motor Carrier Safety Regulations, 49 C.F.R. Parts 379 and 395 (records retention; hours of service and electronic logging devices).
• Cal. Code Civ. Proc. §335.1; Cal. Gov. Code §911.2.

Frequently asked questions

What evidence should be saved after a semi truck accident?

Electronic logs, the truck’s black box data, camera footage, driver and maintenance files, dispatch records and phone records can all matter. A lawyer can demand that they be kept.

What is a preservation or spoliation letter?

It is a written demand that the trucking company and others keep specific records and the truck unchanged because a claim is expected.

How long does a trucking company keep its records?

It varies by type of record, and some driver logs have short retention periods. Do not wait to find out; ask a lawyer to send a demand early.

Can I get the truck’s black box data?

Often it can be requested and, if necessary, pursued through the legal process. It is far easier if the data has been preserved from the start.

Who can be held responsible for a semi truck crash?

Possibly the driver, the trucking company, a shipper or broker, or a maintenance contractor, depending on the facts.

Should I talk to the trucking company’s insurance adjuster?

Be careful. Do not give a recorded statement before speaking with a lawyer, and do not sign a release.

What if I am not sure which company owns the truck?

Photograph the company name, DOT number and plates if you can. A lawyer can often find the carrier from those details.

How long do I have to file a lawsuit?

Generally two years for personal injury in California (CCP §335.1). Claims against government entities have a six-month claim deadline (Gov. Code §911.2).

What if the crash involved a port or container truck?

Those trucks often involve several companies. See our guide on port and container truck accidents and speak with a lawyer early.

Can I talk to a lawyer in Spanish?

Yes. Our attorneys speak Spanish themselves. Hablamos Español.

Hurt in a crash with a semi truck? Call (844) 475-9529 for a free consultation. Hablamos Español.

Attorney advertising. This article is general information, not legal advice, and does not create an attorney-client relationship. Past results do not guarantee a similar outcome.