A jackknifing semi-truck is one of the most terrifying sights on any highway. When a tractor-trailer folds at the hitch point — with the trailer swinging outward while the cab skids forward — the truck becomes an uncontrollable mass of steel sweeping across multiple lanes of traffic. Jackknife accidents frequently involve multiple vehicles and cause devastating injuries and fatalities. These crashes are almost always preventable, caused by driver error, mechanical failure, or dangerous road conditions that a properly trained and equipped driver should have anticipated. McFarlane Law represents Texas families devastated by jackknife truck accidents, and our attorneys have the expertise to identify every contributing factor and liable party.

How Jackknife Accidents Happen

A jackknife occurs when the drive wheels of the tractor lock up or lose traction, causing the cab to decelerate while the heavy trailer continues moving forward on its own momentum. The trailer swings outward around the hitch point, folding against the cab like a closing jackknife blade. This typically happens in seconds, giving the driver virtually no time to regain control. The most common trigger is sudden hard braking — when a truck driver slams the brakes, the trailer’s momentum can overcome the traction of the drive wheels, especially on wet, icy, or uneven road surfaces. Empty or lightly loaded trailers are particularly prone to jackknifing because there is less weight pressing the tires against the road surface. Improperly loaded cargo that shifts during braking can also destabilize the trailer. Texas highways present particular jackknife risks: I-10 through West Texas is subject to sudden high winds that can push empty trailers sideways, I-35 through Austin and San Antonio experiences heavy traffic that requires frequent braking, and winter ice on I-20 and I-40 in the Panhandle creates slick conditions that amplify braking risks.

Devastating Impact of Multi-Vehicle Jackknife Crashes

When a semi-truck jackknifes across multiple lanes of a busy highway, the result is often a chain-reaction pileup involving numerous vehicles. The swinging trailer can strike vehicles in adjacent lanes, push cars into barriers or off the road, and create an impassable blockage that trailing vehicles crash into at speed. These multi-vehicle collisions compound the injury severity — victims may be struck multiple times as additional vehicles pile into the wreckage. Jackknife accidents frequently close highways for hours while emergency responders extract victims from crushed vehicles. The injuries sustained in these crashes are among the most severe seen in any road accident: crush injuries, traumatic amputations, severe burns from ruptured fuel tanks, and multiple-system trauma requiring emergency surgery. Fatalities are tragically common, particularly for occupants of smaller vehicles struck by the swinging trailer.

Who Is Liable in a Jackknife Truck Accident?

Jackknife accidents typically involve multiple layers of negligence. The truck driver may have been traveling too fast for conditions, following too closely, or braking improperly. The trucking company may have failed to properly train the driver on jackknife prevention techniques, pressured the driver to operate in dangerous weather, or ignored maintenance issues with the braking system. The party responsible for loading the trailer may have created an unstable weight distribution. The maintenance provider may have failed to properly inspect and service the anti-lock braking system (ABS) or trailer brake components. In some cases, a defective brake system, worn kingpin, or malfunctioning ABS sensor contributed to the jackknife — making the truck or parts manufacturer liable under product liability law. Identifying all responsible parties is critical because it expands the available insurance coverage and increases the potential recovery. Our attorneys conduct thorough investigations that trace every contributing cause.

How McFarlane Law Handles Jackknife Accident Claims

Jackknife truck accident cases require specialized knowledge of commercial vehicle dynamics, FMCSA regulations, and multi-party litigation. McFarlane Law engages accident reconstruction experts who analyze skid marks, gouge patterns, vehicle rest positions, and ECM data to determine the precise sequence of events that led to the jackknife. We retain mechanical engineering experts to examine the truck’s braking system, ABS components, and coupling mechanisms. Our team obtains the trucking company’s training records to determine whether the driver received proper instruction on jackknife avoidance, and we review dispatch records to establish whether the company pressured the driver to operate in unsafe conditions. For multi-vehicle jackknife pileups, we coordinate with other victims’ attorneys to ensure that our clients’ claims receive appropriate priority. Texas’s comparative fault system means that even if a victim bears some percentage of responsibility, they can still recover substantial compensation. If you or a family member was injured in a jackknife truck accident, call McFarlane Law immediately at (512) 222-4900 or (432) 803-5000.

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