What Is an Underride Accident?

David J. Muñoz | November 13, 2026 | Truck Accidents

Large trucks are common on California highways, including Interstate 5 and Interstate 805 near Chula Vista. When a passenger vehicle crashes into a truck, the results can be devastating. One of the most dangerous types of truck crashes is an underride accident.

An underride accident happens when a smaller vehicle slides beneath a large truck or trailer. These collisions can cause severe injuries because the truck may strike the passenger area of the smaller vehicle. Understanding how these accidents happen can help you recognize the risks and know your options after a crash.

How Does an Underride Accident Happen?

An underride accident occurs when a car, SUV, or other smaller vehicle travels partly or fully beneath a large truck or trailer.

Because trucks sit higher off the ground than most passenger vehicles, a car’s bumper and safety features may not absorb the impact as intended. Instead, the truck’s trailer can strike the windshield, roof, or passenger compartment.

These crashes may happen on highways, at intersections, or near loading areas. They are especially dangerous when a truck stops suddenly, turns across traffic, or becomes difficult for other drivers to see.

What Are the Different Types of Underride Accidents?

Underride crashes generally fall into three categories:

Rear underride accidents occur when a smaller vehicle strikes the back of a truck or trailer and slides underneath it.
Side underride accidents happen when a smaller vehicle travels beneath the side of a truck, often during a turn or intersection collision.
Front underride accidents involve a smaller vehicle sliding beneath the front of a large truck during a collision.

Each type can cause serious harm. The location of the impact often affects which parts of the passenger vehicle are damaged and who may be injured.

What Causes Underride Truck Accidents?

Several factors can contribute to an underride accident. Sometimes, more than one driver or company may share responsibility.

Common causes include:

Truck drivers making unsafe turns or lane changes
Sudden stops without enough warning
Distracted or speeding drivers
Poor lighting or missing reflective markings
Broken or poorly maintained trailer safety equipment
Trucks parked in unsafe locations

Rear impact guards are required on many trailers under federal safety rules. However, not every truck has the same equipment, and a guard cannot prevent every underride crash.

Determining the cause often requires examining the vehicles, crash scene, and available safety records.

What Injuries Can Underride Accidents Cause?

Underride accidents can cause life-changing injuries because the upper part of a passenger vehicle may absorb much of the impact. Victims may suffer traumatic brain injuries, spinal cord damage, broken bones, or serious injuries to the neck and chest. Some crashes also result in permanent disabilities or death.

Survivors may need surgery, rehabilitation, and long-term medical care. They may also miss work or struggle with daily activities. Seeking medical attention after a truck accident is important, even if symptoms do not appear right away. Medical records can also help document injuries related to the collision.

Who Can Be Liable for an Underride Accident?

Liability depends on how the crash happened and whether someone acted negligently.

A truck driver may be responsible for an unsafe turn, sudden lane change, or other dangerous driving behavior. A trucking company may also face liability for its driver’s conduct or its own negligent practices.

In some cases, a maintenance provider or equipment manufacturer may share responsibility if defective or poorly maintained safety equipment contributed to the crash.

California follows a pure comparative fault system. This means an injured person may still recover compensation even if they share some responsibility, although their award may be reduced.

What Compensation Is Available After an Underride Crash?

People injured in underride accidents may be entitled to compensation when another party’s negligence caused their injuries.

Depending on the case, recoverable damages may include medical bills, future treatment costs, lost income, reduced earning ability, and pain and suffering.

Families who lose a loved one may also have grounds to pursue a wrongful death claim.

Under California Code of Civil Procedure § 335.1, most personal injury lawsuits must be filed within two years. Some claims, including those involving government entities, have shorter deadlines.

Contact the Chula Vista Truck Accident Lawyers at Mission Personal Injury Lawyers for Help Today

An underride accident can leave you facing serious injuries, medical expenses, and uncertainty about the future. Understanding who caused the crash is an important step toward protecting your rights.

At Mission Personal Injury Lawyers, our Chula Vista truck accident attorneys can investigate the collision, review available evidence, and pursue compensation from responsible parties. We understand the challenges that can follow a serious truck crash and are prepared to advocate for injured clients.

We proudly serve San Diego County and throughout California.

Mission Personal Injury Lawyers – San Diego Office
3666 Fourth Ave, San Diego, CA 92103
(619) 777-5555

Mission Personal Injury Lawyers – Chula Vista Office
690 Otay Lakes Rd #130, Chula Vista, CA 91910
(619) 722-3032

We also serve the state of Texas. For legal assistance, contact our personal injury law office in El Paso today.
Mission Personal Injury Lawyers – El Paso Office
201 E Main Suite 106, El Paso, Texas 79901
(915) 591-1000