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Hard braking and speed
Sudden braking at highway speed is the most common trigger. When the tractor slows faster than the trailer, the trailer can slide and swing out. That usually happens when the driver was following too closely or not watching traffic ahead. California drivers must not follow more closely than is reasonable for the speed, traffic and road (Vehicle Code 21703).
Speed on curves, off-ramps and downhill grades also plays a part. A truck that enters a curve too fast can lose traction on the trailer axles. The truck’s engine data usually records speed and braking in the seconds before the crash, which makes these claims easier to prove when the data is saved.
Loads and equipment
An empty or lightly loaded trailer has less weight on its wheels and can slide more easily when the driver brakes. A load that shifts during braking can also push the trailer out of line. Federal rules require cargo to be contained, immobilized or secured so it does not shift or fall (49 C.F.R. 393.100). See overloaded truck crashes for weight problems.
Brakes that are out of adjustment or worn can lock up unevenly and start a skid. Worn tires reduce grip on wet pavement. The carrier’s inspection and maintenance records, along with public inspection data on the FMCSA website (FMCSA SAFER), can show whether the company knew about equipment problems. Our page on brake failure crashes explains more.
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The driver: fatigue and distraction
A tired driver reacts late and brakes harder, which raises the chance of a jackknife. Federal rules cap a property-carrying driver at 11 hours of driving after 10 hours off duty and require a 30-minute break after 8 hours of driving (49 C.F.R. 395.3). Phone records and dispatch messages can show distraction.
Weather is often blamed, but rain and wind are reasons to slow down and leave more space. Read truck crashes in rain or high wind for more. When the driver was on the job, the trucking company is generally responsible for the driver’s careless driving in California (CACI No. 3700).
What to do now
If you were hurt in a jackknife crash, get medical care and keep every appointment. Take photos of the trailer’s angle, skid marks, the road and any spilled cargo. Get witness names and numbers, and keep the police report number and every claim number together. Note the weather and road surface while you remember them.
Do not sign a release or give a recorded statement to the trucking company’s insurer until you talk to a lawyer. Keep receipts for treatment and lost work. The general deadline to file an injury lawsuit in California is two years (Code of Civil Procedure 335.1). In Washington it is generally three years (RCW 4.16.080).
How Beverly Law can help
We find out what caused the jackknife by requesting the truck’s data, logs, loading papers and maintenance records, and we bring in independent reconstruction help when needed. Then we use that evidence to show who is responsible. Read who is at fault in a jackknife truck accident for how fault is divided.
You owe no fees or costs unless we win. Visit our California truck accident lawyer page to learn more about how we handle truck cases. The first conversation is free, there is no obligation to hire us, and our team speaks Spanish. Call (310) 552-6959 or use the form on this page.
Common questions
Can an empty trailer make a truck jackknife?
Yes. An empty or light trailer has less weight on its tires, so it can lose grip and slide more easily during hard braking or on a wet road. Drivers hauling empty trailers are expected to adjust their speed and following distance for that.
Do anti-lock brakes stop jackknifes?
They help but do not prevent every jackknife. Brakes that are poorly adjusted, worn or not working as designed can still lock up or pull unevenly. Inspection and maintenance records show whether the truck’s brakes were in good working order before the crash.
Is the trucking company responsible if the load caused the jackknife?
It can be, and so can whoever loaded and secured the cargo. Federal rules require cargo to be secured so it does not shift or fall. Loading records and photos of the cargo after the crash help show who was in charge of the load.
How do you prove what caused a jackknife?
With the truck’s engine and braking data, electronic logs, dashcam video, the crash report, inspection results and photos of the scene. An independent reconstructionist can put those pieces together. Much of this evidence sits with the trucking company, so it should be requested early.
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If you were hurt in a car or truck crash in California and Washington, talk to a personal injury attorney. Free, confidential, English or Spanish. You owe no fees or costs unless we win.
Related pages
Can I sue a truck driver for hitting me? · Who is liable in a truck accident: the driver, the trucking company or the broker? · Rear-ended by a semi truck: what to do · Hit by a semi truck on the freeway: your rights · Jackknife truck accident: who is at fault? · All car and truck accident questions
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Important: This page is general information about California and Washington law, not legal advice, and reading it does not create an attorney-client relationship. Every case is different; talk to a lawyer about yours. Last reviewed: November 5, 2026.