Underride and Unsafe Lane Changes: What Trucking Companies Must Preserve (Dash Cam, ELD Data, Maintenance Logs)
After a crash with a semi-truck on an Orange County freeway, the evidence that proves what happened is almost entirely in the hands of the trucking company. The dash cam footage, the electronic logging device data, the maintenance records, the driver qualification file, all of it sits on servers and in filing systems controlled by the same company that is already working to limit its legal exposure.
That evidence has a short shelf life. Some of it is overwritten automatically. Some of it gets destroyed. Knowing what exists, what the law requires the company to keep, and how to force them to preserve it can determine whether your claim succeeds or fails.
At Hicks Law Firm, PC, our truck accident attorneys in Orange County fight to preserve evidence. This helps us to pursue full compensation for injured victims across Orange County and Southern California. Call us at 949-541-9944 or fill out our confidential contact form to schedule a free consultation.
Why Underride Crashes and Unsafe Lane Changes Demand a Deeper Investigation
Two of the most catastrophic types of truck collisions, underride crashes and sudden unsafe lane changes, share a common thread: the trucking company almost always controls the most important evidence.
An underride crash is one of the most dangerous types of truck accidents. It happens when a car slides under the trailer of a large semi-truck, usually from the back or the side. Because the top of a car offers little protection, these crashes are often deadly.
According to FMCSA data, 94 percent of rear underride crashes cause death or serious injury. Federal law requires most trailers to have a rear guard to help prevent this, but there is no nationwide rule requiring the same protection along the sides of trailers.
Unsafe lane changes are another major cause of serious truck accidents on California highways. A fully loaded semi-truck can weigh up to 80,000 pounds and has large blind spots on both sides where the driver simply cannot see. If a truck driver doesn’t check their mirrors, forgets to signal, or changes lanes while tired, nearby cars can be severely damaged – or worse.
Proving the driver made an unsafe lane change, and that the trucking company knew the driver was fatigued or had a history of traffic violations, requires getting to the right records fast.
Dash Cam Footage: What It Captures and Why It Disappears
Most commercial trucks operated by major carriers have forward-facing and driver-facing cameras. Systems from companies like Lytx, SmartDrive, and Samsara record continuously and can capture the seconds before and during a crash. This includes the speed of the rig, whether the driver checked mirrors before changing lanes, whether the driver’s eyes were on the road, and whether brake lights were activated in time.
This footage is often stored on a rolling loop. Without a legal hold in place, the system can overwrite the critical recording within days. Trucking companies know this.
If you want to preserve this evidence, you’ll need a trucking accident attorney to move quickly. Your California truck accident lawyer must send a written preservation demand, known as a spoliation letter, that puts the company on legal notice that the footage must be retained. Once that letter is received, intentional destruction of the footage can expose the company to severe legal consequences, including adverse jury instructions.
ELD Data: The Electronic Record That Cannot Be Easily Altered
Since 2017, federal law has required most commercial trucks to carry electronic logging devices (ELDs). These devices connect directly to the truck’s engine and automatically record driving time, vehicle movement, engine hours, and location coordinates. Unlike the paper logs that drivers once filled out by hand, ELD data is difficult to falsify.
In an underride crash or unsafe lane change case, ELD records can help your case significantly. It will show whether the driver had exceeded the legal 11-hour driving limit under FMCSA hours-of-service rules, whether the driver failed to take a required rest break, and precisely where the truck was and how fast it was moving in the minutes before impact.
When ELD data shows an hours-of-service violation just before a crash, that evidence points directly to driver fatigue as a cause, and it extends liability to the trucking company that put that driver on the road.
Maintenance Logs is the Paper Trail Behind Defective Equipment
Underride crashes are sometimes due to equipment failure. A rear underride guard that was damaged and never repaired. Reflective tape that had peeled away, making a trailer invisible in low-light conditions. Faulty brake systems that prevented the driver from stopping in time.
FMCSA regulations under 49 CFR Part 396 require trucking companies to maintain detailed inspection, repair, and maintenance records for every vehicle in their fleet. Those records document when a defect was found, what was done about it, and whether the truck was kept in service when it should have been taken off the road. A skilled trucking accident lawyer in Orange County will subpoena these records and work with mechanical experts to connect a maintenance failure to the crash.
The Driver Qualification File
Beyond the electronic records, every trucking company is required by federal law to maintain a driver qualification file (DQF) for each driver. This file includes the driver’s employment history, prior traffic violations, commercial driver’s license status, medical certifications, and drug and alcohol test results.
If the driver who caused your crash had prior unsafe lane change violations, a history of fatigue-related incidents, or a suspended license that the company ignored, the DQF will show it. These records reveal whether the trucking company was negligent in who it hired and kept behind the wheel.
Contact Our Orange County Truck Accident Law Firm
If you or someone you care about was injured in an underride crash, an unsafe lane change collision, or any other trucking accident in Orange County or Southern California, do not wait. Call us at 949-541-9944 or reach us toll-free at 866-HICKS-LAW to speak with a trucking accident attorney. All consultations are free and confidential.
Aaron Hicks is a civil trial attorney and founder of Hicks Law Firm, based in Orange County with offices in San Diego and Tennessee. His practice includes representing plaintiffs in personal injury cases including motor vehicle accidents, premises liability, dog bites and wrongful death. Mr. Hicks is and AV Rated attorney, Super Lawyer and is currently on the Board of Directors of the Orange County Trial Lawyers Association where he serves as 1st Vice President.
