Cargo Shift & Overloaded Truck Accidents

Cargo Shift and Overloaded Truck Accidents

By the Big Rig Lawyer editorial teamLast updated: 2026-09-16

Editorial note: Legal facts reviewed by a licensed attorney on 2026-09-20; wording updated 2026-09-23. The reviewer is not named here at their request. It is general legal information, not legal advice. Content is based on publicly available FMCSA, NHTSA, and IIHS sources and general legal principles. Laws vary by state and change over time — confirm anything that affects your case with a licensed attorney in your state.

A cargo shift accident happens when an improperly secured or balanced load moves in transit, changing the trailer's center of gravity and causing a rollover, jackknife, or roadway spill. Federal rules set securement standards by cargo type, so a shifted load usually means the shipper, loader, or carrier missed one of them.

Look at the bottom of a lot of bills of lading and you'll find four words: "shipper load and count." Sometimes it's just "SLC" or "SL&C." It means the shipper loaded the trailer and counted the freight, and the driver didn't. Plenty of drivers back into a door, wait in the lot, get a sealed trailer and a stack of paper, and pull out without ever seeing what's behind the doors.

Then the load moves. Maybe it's pallets stacked two high that slide on the first hard stop, or a coil that wasn't chocked, or a heavy load bunched over the tandems. The driver feels the trailer shove or lean and has a second to react. For the car nearby, a cargo shift can mean a rollover, a jackknife, or freight (sometimes whole pallets or equipment) coming off an open deck into live traffic.

Federal cargo securement rules

Flatbed load of steel coils secured with chains and binders in morning light

FMCSA cargo securement standards (49 CFR Part 393, Subpart I) require that cargo be:

Secured against shifting, including sliding and tipping, under normal driving conditions
Restrained by enough tiedowns rated for the cargo's weight
Distributed so the load doesn't exceed axle weight limits or throw off handling
Loaded within the trailer's and truck's rated capacity. Overloading is its own, separately regulated violation.

Drivers are required to inspect cargo securement before departure and periodically during a trip. On a flatbed that means walking the straps and chains. On a sealed box, it may mean the driver never had the chance. Violations show up in roadside inspection records and driver vehicle inspection reports.

Common cargo-related failures

Snapped cargo strap and scattered boxes on a highway shoulder behind a stopped truck

Not enough tiedowns for the cargo's weight or shape
Bad weight distribution, with too much toward the front or rear axle
Liquid load surge in tankers without baffles, or driven too hard for a partial load
Overloading past the trailer's or tires' rated capacity
Loose or falling debris from open trailers or badly tarped loads

Who can be held liable?

Warehouse loading bay with a sealed trailer door and a clipboard of shipping papers

The cargo shipper or loader, often a separate company from the carrier, directly liable for negligent loading
The trucking company, responsible for verifying securement before dispatch and en route
The driver, required to inspect the load and refuse to drive an unsafe trailer
A third-party logistics or freight brokerage, in some cases, for choosing an unqualified loader

The paper trail that shows who loaded it

Cargo cases are won on documents. The bill of lading shows who shipped the load and whether it was marked shipper load and count. Loading dock records show which door, which crew, and when. Scale tickets and weigh-station data show what the truck actually weighed and how it sat on each axle. Photos of the seal, and whether it was still intact after the crash, can matter a lot.

A big rig truck accident lawyer will pull that paper trail alongside the carrier's maintenance and dispatch records. See FMCSA regulations & evidence and who else can be held liable.

If you were driving vs. if you were hit

If you were the driver, hang on to your copy of the bill of lading, the seal number, and any scale ticket. Write down whether you were allowed to watch the loading or inspect the trailer, and who told you it was ready. Those details can point straight at the loader.

If you were in a car, photograph any cargo in the road before it's cleared, along with straps, chains, or tarps near it, and the company names on the tractor and trailer. Loose freight gets picked up fast, and the photos may be the only record of how it was tied down.

Related causes

Sources

49 CFR Part 393 Subpart I — Protection against shifting and falling cargo — Electronic Code of Federal Regulations
Cargo Securement Rules — background and applicability — Federal Motor Carrier Safety Administration
49 CFR Part 396 — Inspection, repair, and maintenance — Electronic Code of Federal Regulations
Large Truck and Bus Crash Facts — Federal Motor Carrier Safety Administration
Safety Measurement System — carrier safety records by BASIC — FMCSA Safety Measurement System

Federal regulations and crash statistics are updated periodically. Figures cited on this page reflect the referenced publications at the time of writing; check the source for the current edition.

Frequently asked questions

What is a cargo shift accident?

It's a crash that starts when the load moves in transit and changes the trailer's center of gravity mid-drive. The result is usually a rollover, a jackknife, or freight falling into the road and hitting other vehicles. Federal rules set specific securement requirements by cargo type and weight, so a load that shifted is usually a load that was secured improperly.

Who is liable when a truck's load shifts?

Often the shipper or loading company rather than the trucking company. They're frequently separate businesses, and whoever loaded the trailer can be directly liable for negligent loading. The motor carrier is still responsible for verifying securement before dispatch and en route. The driver is required to inspect the load and to refuse to drive an unsafe trailer. A freight broker may share liability for picking an unqualified loader.

What are the federal cargo securement rules?

Cargo securement is governed by 49 CFR Part 393 Subpart I. It requires cargo to be firmly immobilized or secured so it can't shift or fall, and it sets minimum tiedown counts and working load limits scaled to the cargo's weight and length. There are extra commodity-specific rules for logs, metal coils, concrete pipe, vehicles, and other loads with known ways of failing.

Can I sue if cargo fell off a truck and hit my car?

Yes. Falling or loose cargo is a recognized securement failure, and liability can attach to the loader, the carrier, and the driver. These claims often have more than one defendant, because the company that loaded the trailer, the one that dispatched it, and the one that inspected it may all be different. Preserving the load manifest, bill of lading, and securement photos matters right away.

What is liquid load surge?

It's liquid moving inside a partly filled tanker as the truck speeds up, brakes, or turns. That moving mass can shove the truck forward under braking or add to the lean in a curve. Tankers without internal baffles are especially prone to it. Drivers hauling partial liquid loads need specific training in handling surge, and when that training is missing, it's a claim against the carrier.

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