The Hidden Dangers of Illegal Parking by 18-Wheelers on Highways

Semi-truck without hazard indicators, creating a dangerous traffic hazard.

Illegal parking by 18-wheelers on highway shoulders is a significant safety issue that contributes to severe truck accidents nationwide. While shoulders are designed for emergencies, many truck drivers misuse these spaces to take mandatory breaks or due to poor planning, leading to catastrophic consequences. These accidents not only violate Hours of Service (HOS) rules but also expose glaring negligence, such as failing to deploy warning devices like red triangles or reflectors. The improper use of highway shoulders or adjacent areas—often without lights or signals—leaves unsuspecting drivers at extreme risk.

At law.net, we understand the complexities of truck accident cases caused by negligent parking practices. With over 40 years of experience, Board-Certified Personal Injury Trial Lawyer David P. Willis and his team are dedicated to helping victims nationwide. As a former attorney for the Supreme Court of Texas, Willis brings unparalleled expertise to secure justice and compensation for clients. While licensed in Texas and New York, Willis partners with local co-counsel across the United States, ensuring every victim receives top-tier representation. Importantly, we work on a contingency fee basis, meaning there are no fees or expenses unless we win your case.

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How Illegal Parking Leads to Catastrophic Truck Accidents

Misuse of Highway Shoulders

Highway shoulders serve a critical purpose: providing space for vehicles experiencing mechanical breakdowns, emergencies, or other legitimate issues. However, many 18-wheelers misuse these areas for non-emergency purposes, such as taking mandatory rest breaks when they cannot find designated parking areas. This practice is often a result of poor planning, lack of available rest stops, or the driver reaching the end of their legally allowed driving hours under Hours of Service (HOS) regulations. While the Federal Motor Carrier Safety Administration (FMCSA) provides guidelines for parking and rest periods, some drivers fail to comply, prioritizing convenience over safety.

Parking on shoulders, off-ramps, or unmarked roadside areas creates dangerous, unexpected obstacles for other drivers, particularly on high-speed highways. These areas are not designed for prolonged stops and lack adequate infrastructure to protect stationary vehicles and passing traffic. In many cases, these illegally parked trucks are not experiencing mechanical failures but are simply left in unsafe locations because of negligent decision-making or pressure from employers to adhere to tight schedules.

Additionally, drivers often fail to consider how their actions might impede emergency responders. Illegally parked trucks can block access to medians, emergency lanes, and other critical areas, delaying assistance during accidents or medical emergencies. This negligence compounds the dangers posed by their improper use of the highway shoulder.

The FMCSA mandates that when a truck is parked on the shoulder or roadside, specific safety measures must be employed to warn oncoming vehicles. This includes deploying reflective warning triangles, flares, or lights. These devices are crucial for alerting approaching drivers to the presence of a stationary truck and providing enough time for them to safely change lanes or reduce speed.

However, many truck drivers fail to follow these guidelines. Common violations include:

  • Not deploying any warning devices.
  • Placing reflective triangles at improper distances, which diminishes their visibility and effectiveness.
  • Using defective or poorly maintained devices that do not adequately warn approaching drivers.

The improper or negligent use of warning devices significantly increases the risk of collisions. Drivers traveling at highway speeds rely on these early signals to adjust their behavior, and without them, they may not have enough time to react. This is particularly true in situations where visibility is compromised, such as during rain, fog, or nighttime driving.

Poor Visibility at Night

The risk posed by illegally parked trucks is amplified at night or during adverse weather conditions. Many trucks parked on shoulders lack adequate lighting, reflective tape, or functional hazard lights, making them nearly invisible to approaching vehicles. Drivers traveling at speeds of 50–75 mph have only seconds to react, and when visibility is low, the chances of avoiding a collision are drastically reduced.

In some cases, truck drivers neglect to use even basic safety measures like keeping their hazard lights on. Even when reflective devices are used, they may be improperly placed or insufficiently visible due to environmental factors. The combination of high speeds, low visibility, and a stationary 18-wheeler creates a perfect storm for catastrophic accidents.

The severity of these collisions is compounded by the size and weight of the truck. When a smaller vehicle collides with a stationary 18-wheeler, the results are often devastating, including severe injuries, vehicle destruction, and, tragically, fatalities.

Illegal parking can trigger chain-reaction accidents, particularly on busy highways. For example, a driver swerving to avoid a parked truck may inadvertently collide with other vehicles or lose control, leading to multi-car pileups. These secondary accidents often cause even greater harm than the initial hazard posed by the parked truck. The cascading effects underscore the importance of adhering to parking regulations and safety standards.

Employer and Driver Negligence

While the truck driver is often the immediate cause of illegal parking, employers also bear responsibility. Many trucking companies fail to provide adequate training or ensure compliance with federal and state regulations. Employers may neglect to plan routes that include sufficient rest stops or exert undue pressure on drivers to meet delivery deadlines, effectively encouraging risky behaviors like parking in unsafe areas.

Drivers who park illegally often do so out of convenience or because of employer-imposed constraints. However, these actions reflect a failure to prioritize safety and adhere to HOS regulations, which are designed to prevent such hazardous scenarios. Both the driver and the employer can be held liable for accidents resulting from illegal parking practices.

Accidents involving illegally parked trucks often involve liability and insurance complexities, particularly when they occur at night or lead to underride collisions. Rear-end underride accidents, where smaller vehicles slide under the trailer of a truck, are among the most deadly. These collisions frequently result in severe head trauma, decapitation, or death due to the lack of structural protection in the smaller vehicle.

Even when underride guards are present, they may be poorly maintained or inadequate to prevent such accidents. This negligence can further increase the liability of the truck driver and their employer.

Addressing the Problem: Enforcement and Accountability

To mitigate the dangers of illegal parking, stricter enforcement of FMCSA regulations and greater accountability for trucking companies are essential. Authorities must ensure that drivers adhere to HOS rules and avoid using highway shoulders as rest areas unless absolutely necessary. Additionally, employers should be held accountable for providing proper training, planning safe routes, and ensuring that drivers have access to designated parking facilities.

By addressing these systemic issues, the trucking industry can reduce the frequency of accidents caused by illegal parking and improve overall road safety.

The Biomechanics of Hitting a Parked Truck at Highway Speeds

When a passenger vehicle collides with a stationary 18-wheeler, the forces involved are catastrophic. At speeds of 50–75 mph, the smaller vehicle absorbs the brunt of the impact due to the truck’s immense size and weight.

Underride Accidents

One of the most devastating outcomes is underride accidents, where a car slides under the truck’s trailer. This often results in severe head and upper-body injuries, including decapitation. Despite the availability of underride guards, many trucks either lack these devices or have poorly maintained ones.

Blunt Force and Ejection Injuries

The sudden deceleration caused by a collision with an immovable object generates enormous kinetic energy. Occupants of the smaller vehicle may experience traumatic brain injuries, spinal cord damage, or even ejection from the car, leading to life-threatening injuries.

Legal consequences of truckers parking unsafely on highways.

The Role of Driver and Employer Negligence

Driver Negligence

Drivers who park illegally on highway shoulders demonstrate a clear disregard for safety protocols. Common violations include:

  • Ignoring HOS regulations, leading to fatigue and poor decision-making.
  • Failing to deploy proper warning devices.
  • Parking in unsafe locations without considering the risks to other drivers.

Employer Negligence

Trucking companies are also responsible for these accidents. Negligence on their part can include:

  • Failing to provide adequate training on safe parking practices.
  • Ignoring the importance of proper route planning and rest breaks.
  • Pressuring drivers to meet tight deadlines, which forces them to park in unsafe areas.

Holding these parties accountable is essential for ensuring justice and deterring future negligence.

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FMCSA Violations and HOS Rules

The FMCSA establishes strict guidelines for truck driver behavior, including:

  • HOS regulations: Drivers must adhere to specific limits on driving and rest hours. Parking illegally due to exceeding these limits is a clear violation.
  • Equipment requirements: Trucks must be equipped with reflective triangles, flares, or other warning devices.
  • Maintenance of lighting and reflective materials: Ensuring visibility for stationary trucks is crucial.


Violations of these regulations often play a critical role in determining liability in truck accidents.

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The Importance of Logbooks in Truck Accident Cases

Truck drivers are required to maintain accurate logbooks, detailing their driving hours, rest periods, and compliance with HOS regulations. In many cases, falsified or incomplete logbooks provide evidence of negligence. This documentation is essential for proving liability and holding both drivers and employers accountable. To learn more about the significance of logbooks, visit our truck driver’s logbook page.

What to Do After a Truck Accident Caused by Illegal Parking

Victims of truck accidents involving illegally parked 18-wheelers should act quickly to protect their rights. Key steps include:

1. Seek Medical Attention

Your health and safety are the top priority.

2. Document the Scene

Take photos of the accident site, including the truck’s position, lighting, and warning devices.

3. Contact an Experienced Attorney

Truck accident cases are complex, requiring legal expertise to investigate FMCSA violations and negligence.

Securing Justice for Victims

At law.net, we specialize in holding negligent parties accountable. Our attorneys collaborate with accident reconstruction experts, engineers, and medical professionals to build compelling cases. Whether the negligence lies with the driver, employer, or both, we fight tirelessly to secure maximum compensation for medical expenses, lost wages, and emotional suffering.

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Why Choose Willis Law?

With over 40 years of experience, David P. Willis is a leader in truck accident litigation at law.net. As a Board-Certified Personal Injury Trial Lawyer, certified by the Texas Board of Legal Specialization, and a former attorney for the Supreme Court of Texas, Willis has the expertise to handle even the most challenging cases. While licensed in Texas and New York, his firm partners with local co-counsel to represent clients nationwide. Importantly, we work on a contingency fee basis—no fees or expenses unless we win your case.

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Illegal parking by 18-wheelers on highway shoulders poses a grave danger to motorists. These accidents often involve violations of HOS regulations, inadequate warning devices, and driver negligence. Victims face devastating consequences, including underride accidents, traumatic injuries, and fatalities. At law.net, we are committed to securing justice for those affected by these preventable tragedies.

If you or a loved one has been injured in a truck accident, contact our experienced team today for a free consultation. Let us fight for the compensation and accountability you deserve.

Call Us at 1-888-LAW-2040 for a Free Case Review