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Common Causes of Commercial Truck Accidents on Pennsylvania Highways

Home  >  Blog  >  Common Causes of Commercial Truck Accidents on Pennsylvania Highways

December 10, 2025 | By Hill & Associates
Common Causes of Commercial Truck Accidents on Pennsylvania Highways Sharing the road with large commercial trucks is a daily reality for drivers across the Commonwealth. From the busy lanes of I-95 through Philadelphia to the long stretches of the Pennsylvania Turnpike, these massive vehicles are essential to our economy. However, their size and weight mean that when something goes wrong, the results can be devastating.  A serious Pennsylvania highway truck crash is rarely a simple event; it often involves a complex mix of human error, mechanical issues, and corporate decisions. When an incident occurs, determining the common causes of truck accidents is key to establishing accountability. These situations can be complicated, leaving individuals and families facing a difficult road to recovery.

Key Takeaways about the Causes of Truck Accidents on Pennsylvania Highways

  • Driver error, including fatigue, distraction, and speeding, is a leading factor in commercial truck accidents.
  • Federal and state regulations, such as hours-of-service rules, exist to prevent tired driving, but violations still occur.
  • Mechanical failures involving brakes, tires, and other essential systems often contribute to serious crashes.
  • Trucking companies can be held responsible for negligent practices like improper maintenance, poor hiring, or encouraging drivers to break safety rules.
  • Improperly loaded or secured cargo can shift during transit, leading to a loss of vehicle control and potential accidents.

Driver Error: A Leading Cause of Truck Accidents

Even the most experienced truck driver is human, and mistakes can happen. However, when operating an 80,000-pound vehicle, a small mistake can have major consequences. Many of the most serious truck accident causes in PA stem from the actions—or inactions—of the person behind the wheel.

Truck Driver Fatigue Laws in PA and the Dangers of Drowsy Driving

Driving a commercial truck is a demanding job with long hours. To combat the risks of tired driving, the Federal Motor Carrier Safety Administration (FMCSA) has established strict hours-of-service regulations. These rules dictate how long a driver can be on the road before they must take a mandatory rest break. Despite these laws, driver fatigue remains a significant problem. The pressures to meet tight deadlines can lead some drivers and companies to bend or break the rules. A tired driver can experience:
  • Slowed reaction times
  • Impaired judgment and decision-making
  • A higher risk of falling asleep at the wheel
These effects are similar to those of driving under the influence of alcohol. When a driver gets behind the wheel without adequate rest, they put everyone on roads like the Schuylkill Expressway (I-76) at risk. Investigating a crash often involves checking the driver's electronic logging device (ELD) to see if trucking negligence in Pennsylvania, in the form of violating these federal safety rules, played a part.

Distracted Driving in a Commercial Vehicle

Distracted driving is dangerous in any vehicle, but it’s particularly hazardous in a large truck. A semi-truck traveling at highway speeds covers the length of a football field in just a few seconds. Any distraction that takes a driver's eyes or mind off the road, even for a moment, can lead to catastrophic injuries. Common distractions for truck drivers include:
  • Using a mobile phone: Texting, calling, or using apps is a primary cause of distraction.
  • Interacting with in-cab technology: Adjusting a GPS, dispatching device, or radio.
  • Eating or drinking: Taking hands off the wheel and attention off the road.
Federal law prohibits commercial motor vehicle drivers from texting or using a hand-held mobile phone while driving. Proving that a driver was distracted can be a key part of determining accountability for a collision.

Speeding and Aggressive Driving

The size of a commercial truck makes it much harder to stop than a passenger car. It needs a significantly longer distance to brake, especially when fully loaded or in poor weather. When a truck driver speeds, they reduce their ability to stop in time to avoid a hazard. Aggressive driving behaviors can also lead to serious accidents. These actions include:
  • Tailgating (following too closely)
  • Making improper or unsafe lane changes
  • Failing to yield the right-of-way
These dangerous behaviors endanger everyone on the road. When a driver prioritizes speed over safety, they are failing to uphold their duty to operate their vehicle responsibly.

Mechanical Failures and Maintenance Issues

Damaged semi-truck after accident with shipping container on roadway. A commercial truck is a complex piece of machinery with thousands of parts that must work together perfectly. When a critical component fails, the driver can lose control of the vehicle. Many commercial truck accident factors are related to the vehicle itself.

Brake Problems

A truck's braking system is arguably its most important safety feature. Due to the immense weight they must stop, these systems are complex and require constant maintenance. According to the FMCSA’s own large truck crash causation studies, brake problems are a consistently high-ranking factor in truck-related accidents. Common brake issues include:
  • Worn-out brake pads or drums
  • Improperly adjusted brakes
  • Air leaks in the brake lines
  • Complete brake failure
Both drivers and trucking companies have a responsibility to ensure brakes are in proper working order through pre-trip inspections and regular maintenance schedules.

Tire Blowouts

A tire blowout on a passenger car can be startling; on a large truck, it can be disastrous. The sudden loss of a tire can cause the driver to lose control, leading the truck to swerve, jackknife, or even roll over. Tire failures are often preventable and can be a sign of trucking negligence in Pennsylvania. They are frequently caused by:
  • Underinflation or overinflation
  • Worn-out treads that are below the legal limit
  • Using mismatched or improperly repaired tires
Trucking companies are required to perform regular inspections and replace tires before they become a hazard. A failure to do so is a failure to prioritize safety.

Other Critical Mechanical Failures

Beyond brakes and tires, other systems can fail and cause a crash. These include issues with a truck’s steering, suspension, and lighting. For example, a broken headlight or taillight can make a truck nearly invisible at night, leading to a dangerous rear-end or side-impact collision.  Pennsylvania has specific vehicle equipment standards, and all commercial trucks operating in the state must comply with these as well as federal regulations. Following a collision, a thorough inspection of the truck is essential to identify if any mechanical issues were a contributing factor.

Trucking Company Negligence and Oversight

The driver isn't the only party who may be responsible for a Pennsylvania highway truck crash. The company that owns the truck and employs the driver has a significant duty to ensure its operations are safe. When a company cuts corners on safety to increase profits, it can be held accountable for the harm that results. 

Inadequate Hiring and Training

Trucking companies have a responsibility to hire qualified drivers and provide them with proper training. This means they should conduct thorough background checks, review driving records, and ensure that new hires possess the necessary skills to operate the specific type of truck they will be driving. A company may be considered negligent if it:
  • Hires a driver with a known history of reckless driving or DUI convictions.
  • Fails to provide adequate training on company procedures or safety protocols.
  • Does not offer continuing education or training on new equipment or regulations.
Putting an unqualified or poorly trained driver on the road is a serious risk.

Pressure to Violate Safety Regulations

The trucking industry is highly competitive, and delivery deadlines are strict. Unfortunately, this pressure is sometimes passed down from the company to the driver in dangerous ways. Some companies may implicitly or explicitly encourage drivers to violate hours-of-service rules to make a delivery faster. This could involve pushing drivers to alter their logbooks or drive when they know they are tired. This is a clear example of prioritizing profit over the safety of the public.

Improper Maintenance and Inspection Protocols

While drivers are responsible for daily pre-trip inspections, trucking companies are responsible for implementing and overseeing a comprehensive maintenance program for their entire fleet. A failure to properly maintain vehicles is a major factor in accidents caused by mechanical failure. Negligent maintenance practices can include:
  • Skipping scheduled maintenance to keep a truck on the road.
  • Using cheap, substandard replacement parts.
  • Failing to properly document repairs and inspections.
A company's maintenance records can provide powerful evidence about whether they upheld their safety responsibilities leading up to a crash.

Cargo Loading and Securement Errors

The way cargo is loaded onto and secured in a trailer is critical for a truck’s stability. If cargo is not properly balanced or secured, it can shift during transit. This shift can change the truck’s center of gravity, making it difficult to control, especially around turns or during sudden stops. An overloaded truck is also a significant hazard. Too much weight can put immense strain on the truck’s tires and brakes, increasing the risk of failure. Federal and state laws regarding size, weight, and load set strict limits on how much a truck can carry. Violating these limits not only damages roads but also creates a direct danger to other motorists. The responsibility for proper loading often falls on a third-party shipping or loading company, but the driver and trucking company also have a duty to ensure the load is safe before starting a trip. These different commercial truck accident factors show how a single incident can have multiple causes. Identifying every contributing factor is a detailed process but is essential for understanding what happened and holding the responsible parties accountable.

Commercial Truck Accident FAQs

Here are answers to some common questions about the factors leading to large truck collisions.

Can bad weather be the only reason for a truck accident?

While weather conditions like heavy rain, fog, or snow can certainly contribute to a crash, they are rarely the sole cause. Commercial truck drivers are held to a higher standard and are expected to adjust their driving for the conditions. This means slowing down, increasing following distance, or even pulling over if the weather becomes too dangerous. An accident in bad weather may still involve negligence if the driver failed to take these necessary precautions.

How does a trucking company's hiring process influence road safety?

A trucking company's hiring process is a foundational element of its safety culture. A company that fails to perform thorough background checks, verify commercial driver's licenses (CDLs), or review a candidate's driving history may knowingly or unknowingly put a dangerous driver on the road. A pattern of hiring drivers with multiple violations can be a strong indicator of systemic trucking negligence in Pennsylvania.

Are there different rules for trucks carrying hazardous materials?

Yes, trucks transporting hazardous materials ("hazmat") are subject to even stricter federal and state regulations. These rules cover everything from the type of placards displayed on the truck to specific driver training and certification requirements. An accident involving a hazmat truck can have far-reaching consequences, and investigations will closely examine whether all specialized safety protocols were followed.

What role does road design play in a Pennsylvania highway truck crash?

The design and condition of the road can sometimes be a factor in an accident. Issues like poor lighting, missing guardrails, confusing signage, or dangerous on-ramps can create hazardous situations. While driver error is more common, in some cases, a government entity could be responsible if a poorly maintained or designed road contributed to the crash.

Contact a Philadelphia Truck Accident Lawyer Today

If you or a loved one has been involved in a collision with a commercial truck, the path forward can seem uncertain. Understanding the complex commercial truck accident factors and dealing with trucking and insurance companies requires focus and resources at a time when you need to prioritize your recovery. Speaking with an experienced truck accident lawyer can help you protect your rights and navigate the challenges ahead. The legal team at Leonard Hill Personal Injury Lawyers And Car Accident Lawyers is committed to helping those affected by these serious incidents. We use our 50+ years of combined experience to investigate every detail of a crash, identify all responsible parties, and advocate for the financial recovery our clients deserve. We believe in honest, straightforward communication and provide personalized attention to every case.  The sooner you reach out, the sooner we can begin helping you. Contact us today at (215) 567-7600 or through our online form for a free consultation to discuss your situation.

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    Table Of Contents

    • Key Takeaways about the Causes of Truck Accidents on Pennsylvania Highways
    • Driver Error: A Leading Cause of Truck Accidents
    • Mechanical Failures and Maintenance Issues
    • Trucking Company Negligence and Oversight
    • Cargo Loading and Securement Errors
    • Commercial Truck Accident FAQs
    • Contact a Philadelphia Truck Accident Lawyer Today

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