Law Office of Michael J. Tremoulis | September 22, 2026 | Truck Accident
A jackknife accident happens when a truck’s trailer swings outward at an angle toward the cab, creating a shape similar to a folding pocketknife. These crashes can happen suddenly and may cause the trailer to sweep across several lanes of traffic.
Because commercial trucks are much larger and heavier than passenger vehicles, a jackknife accident can cause serious injuries and extensive property damage. Understanding why trucks jackknife and what happens during these crashes can help motorists recognize the risks involved.
How Does a Jackknife Accident Happen?
A tractor-trailer has two major sections connected by a coupling device: the tractor, which contains the engine and cab, and the trailer carrying the cargo. During normal travel, the trailer follows behind the tractor.
Jackknifing occurs when the tractor and trailer stop moving together in a straight line. The trailer begins swinging toward one side while the tractor continues facing another direction. Eventually, the two sections can form a sharp angle.
Once a trailer begins swinging, the truck driver may have difficulty regaining control. The trailer can strike nearby vehicles or block multiple traffic lanes. In some cases, the truck may also roll over.
What Causes Trucks to Jackknife?
Many different circumstances can cause or contribute to a jackknife accident. Some involve driver actions, while others involve road conditions, mechanical problems, or improperly loaded cargo.
Common causes include:
- Sudden or improper braking
- Driving too fast for road or weather conditions
- Wet, icy, or slippery roads
- Taking curves at excessive speeds
- Improperly loaded or unsecured cargo
- Equipment or brake problems
- Tire blowouts
- Driver inexperience
- Following other vehicles too closely
- Swerving to avoid another vehicle or roadway hazard
More than one factor may contribute to the same accident. Determining why the truck jackknifed can be an important part of establishing who may be responsible for the resulting injuries.
Why Is Hard Braking a Jackknife Risk?
Sudden braking can cause a truck’s wheels to lose traction with the road. If the tractor slows or stops differently from the trailer, the trailer’s momentum may cause it to swing sideways.
Modern trucks may have safety systems designed to reduce this risk, but jackknifing can still occur. Speed, road conditions, vehicle maintenance, cargo weight, and the driver’s response can all affect whether the truck remains under control.
Truck drivers generally need more distance to slow a large commercial vehicle safely. Maintaining adequate following distance can give a driver more time to react without making an abrupt maneuver.
Why Are Jackknife Accidents So Dangerous?
A jackknifed trailer can create a large obstacle across the roadway with little warning. Nearby drivers may have nowhere to go, particularly on busy highways.
Vehicles may collide directly with the tractor or trailer. A swinging trailer can also strike multiple vehicles as it moves across lanes. Other motorists may crash while attempting to avoid the truck, potentially resulting in a chain-reaction collision.
These accidents can cause traumatic brain injuries, spinal cord injuries, broken bones, internal injuries, burns, and other serious conditions. Severe crashes may also result in permanent disabilities or fatalities.
Who Could Be Liable for a Jackknife Truck Accident?
Liability depends on what caused the truck to jackknife. The truck driver may be responsible if negligent driving contributed to the crash. However, other individuals and companies may also share responsibility.
For example, a trucking company could potentially be liable for its own negligent hiring, training, supervision, or maintenance practices. A maintenance provider could be responsible if improper repairs contributed to equipment failure. Cargo-loading companies may also face liability when improperly loaded or secured freight contributes to a loss of control.
Because commercial trucking operations can involve multiple parties, determining liability often requires a detailed investigation.
What Should You Do After a Jackknife Accident?
After a jackknife truck accident, seek medical attention for your injuries and report the crash to law enforcement. If you can safely do so, take photographs of the vehicles, roadway, skid marks, debris, and surrounding conditions. Obtain contact information from witnesses and keep records of your medical treatment and accident-related expenses.
Truck accident claims can involve complicated questions about how the crash occurred and who was responsible. A personal injury lawyer can investigate the collision, preserve relevant evidence, identify potentially liable parties, and explain your options for pursuing compensation.
Contact a Lima Jackknife Accident Lawyer at the Law Office of Michael J. Tremoulis for a Free Consultation
If you were injured in a jackknife truck accident in Lima, Ohio, you may have the right to seek compensation for your medical bills, lost income, pain and suffering, and other losses. The Law Office of Michael J. Tremoulis can investigate the crash, determine who may be responsible, and help you understand your legal options.
If you were injured in an accident in Ohio, and need legal help, contact our truck accident lawyer at the Law Office of Michael J. Tremoulis to schedule a free case review today.
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