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What Are the Most Common Causes of Jackknife Accidents and How Can They Be Defended?

by | Feb 10, 2026 | Truck Accident Defense

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Jackknife truck accidents occur when a commercial vehicle’s trailer swings out at a sharp angle to the cab, typically caused by improper braking, adverse weather conditions, mechanical failures, or excessive speed. Defending these cases requires demonstrating the driver acted reasonably under the circumstances, utilizing innovative strategies, and presenting comprehensive evidence, including electronic logging data and expert testimony. With the help of an experienced lawyer, you can build a strong jackknife accident defense case and protect your business.

At Fahl & Donaldson, our trucking accident defense attorneys understand the complex factors that contribute to jackknife accidents and the critical importance of mounting a strategic defense when trucking companies and their drivers face liability claims. According to the Federal Motor Carrier Safety Administration, 4,842 fatal crashes involving jackknifing occurred in 2020, along with 107,000 injury crashes, underscoring the severity of these incidents and the high stakes involved in defending against related claims.

What Causes Commercial Trucks to Jackknife?

Jackknife accidents rarely result from a single factor. Instead, they typically involve a combination of environmental conditions, mechanical issues, and operational decisions. Understanding the following causes is essential for building an effective defense strategy:

Braking Issues and Empty Trailers

Improper braking ranks among the most common triggers for jackknife accidents. When a truck driver applies the brakes too forcefully or suddenly, the trailer’s wheels can lock up while the cab continues to move forward, causing the trailer to swing outward. This risk increases significantly when trailers are empty or lightly loaded, as reduced weight results in less traction between the tires and the road surface.

Weather and Road Conditions

Rain, snow, ice, and even oil spills on the roadway can dramatically reduce tire traction, making it far easier for a trailer to begin sliding sideways. Texas highways, with their sudden weather changes and varying road conditions, present particular challenges for commercial drivers who must constantly adjust their driving to maintain control.

Mechanical Failures

Faulty braking systems, worn tires, or inadequate maintenance of coupling mechanisms between the cab and trailer can contribute to loss of control. The Federal Motor Carrier Safety Administration requires regular inspections of commercial vehicles, yet mechanical issues still occur, particularly when maintenance schedules are not properly followed or when defects go undetected during routine checks.

Building a Strong Defense Against Jackknife Accident Claims

Defending trucking companies and drivers against jackknife accident claims requires a thorough investigation and strategic approach. Successfully defending these cases often hinges on demonstrating that the driver acted reasonably given the circumstances or that other factors contributed to the incident.

Comparative Negligence Strategies

Texas follows a modified comparative fault system, meaning that if another driver’s actions contributed to the accident, their recovery may be reduced or barred entirely. For instance, if another motorist suddenly cut in front of the truck, forcing an emergency braking situation, or if road conditions created by a third party contributed to the loss of control, these factors can significantly impact liability determinations.

Documentation and Evidence

Electronic logging device data, maintenance records, driver qualification files, and weather reports at the time of the incident all provide critical evidence. GPS data can establish speed and location, while brake system analyses can reveal whether mechanical issues played a role. This evidence can demonstrate that the trucking company and driver maintained appropriate safety standards and responded reasonably to the conditions they faced.

Expert Testimony

Accident reconstruction specialists can analyze the physics of the incident to demonstrate how various factors contributed to the jackknife. Mechanical experts can evaluate whether equipment functioned properly, while human factors experts can explain driver decision-making under pressure, providing crucial context for defending commercial truck accident cases.

Experienced Trucking Defense Representation at Fahl & Donaldson

Jackknife accident cases demand attorneys who understand both the technical aspects of commercial trucking operations and the legal strategies necessary to defend against catastrophic injury claims. At Fahl & Donaldson, we have successfully defended trucking companies and drivers in complex jackknife accident litigation, achieving defense verdicts and favorable settlements through thorough preparation and aggressive advocacy.

Our firm’s trial experience sets us apart in trucking defense. With more than 75 cases tried to verdict, we bring courtroom-tested strategies to every case, whether negotiating settlements or presenting defenses to juries. We understand the regulations governing commercial trucking, the mechanics of jackknife accidents, and the effective use of expert testimony to counter plaintiff allegations. Contact our office to discuss how we can protect your interests following a jackknife accident claim.