California Jackknife Truck Accidents: Causes, Evidence And Responsibility
A jackknife truck accident can happen when a tractor and trailer move out of their normal alignment and the trailer swings toward one side. Once that movement begins, the trailer may cross other lanes, strike nearby vehicles, or become part of a larger loss-of-control crash.
DAG Law Firm, APC represents people injured in serious truck accidents throughout California. A jackknife describes how the tractor-trailer moved during the crash, but it does not automatically explain why the collision happened. You do not pay attorney fees unless we win your case. Call (323) 930-2020 or contact DAG Law Firm today for a free consultation.
What Is A Jackknife Truck Accident?
A tractor and trailer are connected but can move in relation to each other while the truck turns and travels along the road.
During a jackknife, the normal alignment changes as the tractor and trailer rotate toward different directions. The trailer may swing sideways while the tractor continues moving forward or in another direction.
A jackknife can sometimes block several lanes or lead to additional collisions before the truck stops.
The important question is often what happened before the trailer began swinging. Speed, braking, steering, traction, cargo, vehicle condition, roadway conditions, and other factors may all need to be considered.
Braking, Traction And Stability Can Affect A Jackknife
Braking and traction can play an important role in some jackknife crashes. A tractor-trailer depends on the interaction between the tractor, trailer, brakes, tires, roadway surface, steering, and load.
Sudden braking does not automatically mean a driver caused a jackknife. Emergency braking may be a reasonable response to another vehicle or unexpected danger. In other situations, investigators may examine speed, steering, tire grip, or how the tractor and trailer began losing stability.
Modern heavy truck tractors can also have electronic stability control systems. Federal Motor Vehicle Safety Standard No. 136 requires covered truck tractors and large buses with a gross vehicle weight rating above 26,000 pounds to have electronic stability control systems that meet federal requirements.
These systems can use individual wheel braking and engine controls to help reduce directional loss of control and rollover risk. Their presence does not mean a jackknife cannot happen, and the system should be evaluated with the rest of the crash information.
Cargo And Weight Distribution May Affect Truck Stability
Cargo can become important when investigators are trying to understand why a tractor-trailer lost stability.
FMCSA cargo rules generally require covered freight to be properly immobilized or secured so that it does not improperly shift or fall while the vehicle is moving. Different types of freight can also have additional securement requirements.
After a jackknife crash, questions may include how the trailer was loaded, how the weight was distributed, whether cargo moved, and what equipment was used to secure the load.
Loading records, bills of lading, photographs, weight information, inspection papers, and cargo-securement equipment may provide useful information.
A heavy or uneven load does not automatically establish that cargo caused the crash. The information must show whether the load actually affected the truck’s movement or stability.
Brakes, Tires And Maintenance May Need To Be Reviewed
The condition of the tractor and trailer can also matter after a jackknife accident.
Depending on the crash, investigators may examine brakes, tires, wheels, steering, suspension, axles, coupling equipment, or other parts that affect how the truck operates.
FMCSA requires covered motor carriers to systematically inspect, repair, and maintain commercial vehicles under their control and to keep parts affecting safe operation in proper condition.
Maintenance histories, inspection records, repair invoices, driver reports, and physical examination of the truck may help show its condition before the collision.
A maintenance problem does not automatically mean it caused the jackknife. The condition must be connected to the actual crash sequence.
Learn more through DAG Law Firm’s guide to California trucking company negligence claims.
Driver Actions And Hours May Become Important
Driver actions may also need to be reviewed after a jackknife crash.
Questions can involve speed, following distance, lane movement, steering, braking, attention, and how the driver responded to traffic or roadway conditions.
Driver fatigue or scheduling may become relevant when the facts support those questions. For many property-carrying commercial drivers covered by federal hours-of-service rules, FMCSA generally allows up to 11 hours of driving after 10 consecutive hours off duty and prohibits driving beyond the 14th consecutive hour after coming on duty, subject to exceptions and other requirements.
When driver hours are relevant, electronic logs, dispatch messages, trip information, delivery schedules, and other work records may help explain the driver’s schedule before the crash.
Fatigue should not automatically be assumed simply because a commercial truck jackknifed. Learn more about California truck driver hours-of-service rules.
Electronic Data And Physical Evidence Can Help Explain The Crash
Commercial trucks may contain electronic systems that provide information about vehicle operation.
Depending on the truck, information may come from an ECM, EDR, electronic logging device, telematics system, onboard camera, or another source. These systems do not all record the same information.
Available data may provide context about speed, braking, throttle activity, engine operation, or driver hours. The information should normally be compared with photographs, roadway marks, vehicle damage, video, witness statements, and final vehicle positions.
For example, recorded braking information may be compared with roadway evidence. Speed information may be compared with available video. Trailer damage and position may help show how the tractor-trailer rotated during the crash.
No single electronic download or photograph automatically explains why a jackknife occurred. Learn more about California truck accident black box evidence.
Jackknife Crashes Can Involve Several Vehicles
A jackknifed tractor-trailer can occupy much more roadway space than a truck traveling normally.
The trailer may swing into nearby lanes and create a risk of secondary impacts with vehicles traveling beside or behind it. A jackknife can also happen after another collision has already begun.
That makes the order of events important. One vehicle may have been involved before the trailer started swinging, while another may have collided with the truck after it was already out of alignment.
A jackknife is also different from an underride crash. Jackknife describes the movement of the tractor and trailer, while an underride occurs when a smaller vehicle travels beneath part of a truck or trailer. Both can potentially happen during the same larger collision.
DAG Law Firm provides separate information about California underride truck accidents.
Who May Be Responsible After A Jackknife Accident?
Responsibility depends on why the truck lost control and what happened during the larger crash sequence.
Depending on the facts, questions may involve the truck driver, motor carrier, tractor or trailer owner, maintenance provider, cargo-related business, another driver, or several people or businesses.
One crash may mainly involve how the truck was driven. Another may raise questions about brakes, tires, vehicle maintenance, cargo securement, company practices, or another vehicle.
More than one issue can also contribute to the same collision.
No person or company should automatically be considered responsible simply because it owned the truck, employed the driver, maintained the equipment, or handled the cargo. Learn more about who may be responsible after a California truck accident.
Jackknife Truck Accidents Can Cause Serious Injuries
Jackknife crashes can expose nearby drivers and passengers to several different types of impacts.
A passenger vehicle may strike the tractor, side or rear of the trailer, another vehicle, or a roadway barrier. The truck or trailer may also cross several lanes during the crash.
Depending on the collision, injuries can include traumatic brain injuries, spinal trauma, broken bones, neck and back injuries, internal injuries, burns, crush injuries, and other serious conditions.
The medical outcome depends on the actual crash rather than the jackknife label alone. Medical professionals are best positioned to diagnose injuries and determine what treatment or future care may be necessary.
Serious injuries can also make commercial insurance questions more important. Readers can learn more about common injuries after a California truck accident and California truck accident insurance claims.
Resources And How DAG Law Firm Can Help
A jackknife describes the movement of a tractor and trailer, not the cause of a crash. Understanding why the truck lost stability may require reviewing speed, braking, steering, roadway traction, cargo, maintenance, driver activity, electronic records, and the order of events.
DAG Law Firm provides additional resources about California truck accident laws, what to do after a truck accident, who may be responsible after a truck accident, and truck driver hours-of-service rules.
Additional information is available about underride truck accidents, truck accident black box evidence, truck accident insurance claims, and common truck accident injuries.
A serious jackknife accident may require reviewing collision reports, photographs, available video, witness information, tractor and trailer damage, electronic truck data, driver logs, maintenance and inspection records, cargo papers, insurance information, and medical records.
You do not pay attorney fees unless we win your case. There are no upfront attorney fees for qualifying truck accident matters handled on a contingency-fee basis. Call (323) 930-2020 or contact DAG Law Firm today for a free consultation.
