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Underride Accidents: One of the Deadliest Truck Collision Types

Oldham & Smith Dec. 1, 2025

Underride accidents are among the deadliest types of truck accidents on Florida highways. When a smaller vehicle slides under a large truck’s trailer, the upper part of the car can be crushed instantly, often resulting in catastrophic or fatal injuries. These crashes happen quickly and leave victims and families facing devastating consequences.

At Oldham & Smith Attorney at Law, we represent victims of underride accidents throughout Lake County, Florida, and surrounding areas. Our experienced truck accident attorneys strive to hold negligent truck drivers and companies accountable. Contact our firm today to discuss your situation and learn how we can help you.

What Underride Accidents Are

An underride accident happens when a smaller vehicle slides underneath a large commercial truck or trailer. These collisions often occur so suddenly that the car’s safety features can’t protect the occupants, leading to catastrophic injuries. Because of the height difference between cars and trucks, even a low-speed crash can be deadly.

Underride accidents often involve extensive damage, making it difficult to determine what happened. Investigators must analyze skid marks, impact angles, and vehicle damage to identify contributing factors. This type of analysis also helps determine whether the truck had proper underride guards, raising questions about fault and safety compliance.

These crashes are particularly concerning on Florida’s busy highways, where both heavy truck traffic and high speeds increase the danger. That combination of size, speed, and visibility sets the stage for serious collisions that demand close attention to their causes and prevention.

How Underride Accidents Happen on Florida Roads

Underride accidents can happen almost anywhere, but certain road conditions make them more likely. Poor visibility from heavy rain or sun glare, along with the frequent lane merging common on Florida highways, can turn a simple traffic slowdown into a fatal crash. Drivers often have no time to react when a truck stops suddenly ahead.

From our cases across Lake County, we’ve seen common patterns emerge. Some of the most frequent causes of underride crashes include:

  • Sudden braking by large trucks: Cars following can slide under the trailer before coming to a stop.

  • Lack of reflective tape or lights: Inadequate visibility can make it nearly impossible for drivers to see the trailer at night.

  • Improper lane changes: When trucks move into a lane without checking blind spots, smaller vehicles can become trapped.

When these factors combine with Florida’s heavy freight routes, the potential for serious accidents rises dramatically. These conditions also highlight how design flaws in trucks can make these collisions even more dangerous.

Types of Underride Accidents

Not all underride accidents are the same, and each type presents unique dangers. The two main types—rear and side underride crashes—differ in how they occur and what makes them so severe. Both can result in devastating injuries because of how passenger vehicles make contact with the trailer. Some of the most common types include:

  • Rear underride crashes: These occur when a car hits the back of a truck, often because the truck stopped suddenly or lacked proper guards.

  • Side underride crashes: These happen when a car slides under the side of a trailer, frequently during turns or lane changes in low light.

  • Offset or partial underride crashes: These occur when only part of the vehicle goes under the trailer, still causing catastrophic impact injuries.

Each of these scenarios shows how slight differences in design or lighting can determine whether a collision is survivable. The issue becomes even more critical when considering the many factors that contribute to these accidents in the first place.

Factors That Contribute to Underride Crashes

Underride accidents rarely result from one single mistake. They often result from a combination of driver behavior, maintenance failures, and equipment design. Even minor oversights in safety features can have tragic results when dealing with vehicles this large. Some contributing factors we often uncover in our investigations include:

  • Poor truck maintenance: Worn brakes, broken taillights, or missing reflectors increase the risk of a rear-end underride.

  • Driver fatigue or distraction: Truckers who lose focus for even a few seconds can cause devastating chain reactions.

  • Defective or missing underride guards: Outdated or weak guard systems fail to protect smaller vehicles from sliding underneath.

Each of these issues can form a key part of a legal claim, helping show whether a trucking company failed to meet its safety obligations. The impact of these failures becomes even more evident when you look at the severe injuries these crashes can cause.

Common Injuries From Underride Collisions

An underride accident delivers a unique and devastating impact. When the top of a smaller vehicle collides with the underside of a trailer, occupants often sustain severe head and neck injuries, many of which are fatal. Those who survive may endure life-changing trauma and lengthy recoveries.

Victims of underride crashes often experience catastrophic injuries such as traumatic brain injuries, spinal cord damage, and severe fractures. Many require long-term care or permanent disability support. These injuries not only affect victims physically but also place immense emotional and financial strain on their families.

Proving Liability in an Underride Accident Case

Determining fault in an underride accident requires detailed investigation and technical analysis. Evidence such as skid marks, black box data, and witness statements can reveal whether a driver or trucking company acted negligently. Our firm works to preserve this evidence before it’s lost or altered.

An underride accident delivers a unique and devastating impact. When the top of a smaller vehicle collides with the underside of a trailer, occupants often sustain severe head and neck injuries, many of which are fatal. Those who survive may endure life-changing trauma and lengthy recoveries.

Once liability is established, victims must still manage the complicated insurance process that follows a serious truck collision. This stage often determines how quickly victims can access financial support for medical care, vehicle damage, and other critical needs.

Insurance and Compensation Issues After an Underride Crash

Commercial trucking insurance policies can be difficult to manage after a serious accident. Multiple layers of coverage and competing insurers often delay payments or lead to disputes. Victims may face mounting medical bills long before a claim is resolved. Some common challenges we help clients address include:

  • Disputes over fault: Insurers may try to shift blame to reduce payouts.

  • Insufficient coverage: Some policies may not fully cover losses after a severe injury.

  • Complicated policy terms: Multiple carriers can make it hard for victims to know which policy applies.

We guide our clients through these obstacles while protecting their rights under Florida law. A quick, informed response can make a significant difference in how an underride accident case progresses.

Steps to Take After a Suspected Underride Collision

In the aftermath of an underride crash, clear thinking can be difficult. However, certain steps can help protect your safety and legal rights. Prompt action assures that critical evidence isn’t lost and that injuries are properly documented. If you’re involved in an underride collision, we recommend:

  • Seeking immediate medical attention: Some injuries may not be visible right away.

  • Documenting the scene: Take photos of vehicle positions, damage, and surrounding conditions if possible.

  • Contacting law enforcement: Official reports play an important role in establishing what happened.

After immediate safety concerns are addressed, it’s important to reach out to an experienced truck accident attorney as soon as possible. Each accident tells its own story, and gathering evidence early helps preserve that story for accountability.

Reach Out to an Attorney

Underride accidents leave lasting scars on victims and families, often changing lives in an instant. These crashes demand accountability from trucking companies and drivers who fail to prioritize safety. No one should have to face the aftermath of such devastation alone.

At Oldham & Smith Attorney at Law, we help victims of underride accidents pursue justice and hold negligent parties responsible. We serve clients across Lake County, Florida, including Tavares, Eustis, Leesburg, and Groveland, offering experienced legal guidance and compassionate support every step of the way.

If you or a loved one has been injured in an underride accident, call today to speak with our firm and learn your legal options.