What Is an Underride Truck Accident?

An underride accident occurs when a smaller vehicle slides underneath the body of a tractor-trailer, either from the rear or the side. Because the trailer sits several feet above the road surface, a passenger car can become wedged beneath it, with the bottom edge of the trailer striking at or above the windshield level. The results are almost always catastrophic — underride accidents have the highest fatality rate of any truck accident type.

The Insurance Institute for Highway Safety (IIHS) reports that underride crashes kill approximately 400 people annually in the United States. Many more survivors suffer life-altering injuries including decapitation, severe traumatic brain injuries, and crush injuries to the upper body.

Types of Underride Accidents

Rear Underride

Rear underride is the most common type and occurs when a car strikes the back of a truck trailer. This can happen when a truck stops suddenly, when a truck is parked on the shoulder without adequate reflectors or lights, or when a truck merges slowly into highway traffic. Federal law requires rear underride guards (also called ICC bumpers or Mansfield bars) on all trailers manufactured after 1998, but these guards are often insufficiently strong, improperly maintained, or missing entirely.

Side Underride

Side underride occurs when a car slides under the side of a trailer. This typically happens at intersections when a truck makes a wide turn, or when a car strikes the side of a trailer that is crossing a roadway. Unlike rear underride guards, side underride guards are not yet required by federal law — despite years of safety advocacy. Some manufacturers, including several European companies, have voluntarily adopted side guards, but the vast majority of trailers on American roads lack this basic safety feature.

Why Underride Guards Fail

Even when rear underride guards are present, they frequently fail to prevent catastrophic injuries because:

• Insufficient strength standards: Current FMCSA standards require rear guards to withstand only 22,000 pounds of force at the center and 11,000 pounds at the corners — far less than the force generated in many real-world crashes
• Offset impacts: When a car strikes the corner of a trailer rather than the center, many guards buckle or detach entirely
• Poor maintenance: Guards that have been damaged in loading dock impacts, prior accidents, or corrosion may not provide adequate protection
• Height mismatches: Guards mounted too high or on trailers riding higher due to empty loads may fail to engage the bumper of a lower-riding passenger car

Who Is Liable for Underride Truck Accidents?

Liability in underride cases can extend to several parties:

• The truck driver: For stopping or parking without adequate warnings, failure to use hazard lights, or making turns without checking for vehicles alongside the trailer
• The trucking company: For failing to maintain reflective tape, functioning lights, and adequate underride guards on their fleet
• The trailer manufacturer: For designing or manufacturing underride guards that fail to meet minimum strength requirements or fail in foreseeable crash scenarios
• The trailer owner: In cases involving leased equipment, the party responsible for trailer maintenance may be liable for guard deficiencies

Current Legislative Efforts

The Stop Underrides Act has been repeatedly introduced in Congress, calling for stronger rear guards, mandatory side guards, and front override guards on commercial trucks. While the legislation has not yet passed at the federal level, its introduction has increased public awareness and prompted some carriers to voluntarily upgrade their guard systems.

Until comprehensive federal requirements are enacted, truck accident attorneys play a critical role in holding trucking companies accountable for underride deaths and injuries through civil litigation.

Compensation for Underride Accident Victims

Due to the catastrophic nature of underride injuries, these cases often result in substantial settlements and verdicts. Compensation may include:

• Extensive medical bills including emergency care, surgery, rehabilitation, and long-term care
• Lost income and lifetime earning capacity for permanently disabled victims
• Pain and suffering, including disfigurement and loss of enjoyment of life
• Wrongful death damages including loss of companionship and funeral expenses
• Punitive damages when the trucking company knowingly operated trailers with deficient guard systems

Contact a Truck Accident Attorney

Underride truck accidents demand aggressive legal representation from an attorney with specialized trucking accident experience. At Siddons Law Firm, we have the resources to investigate underride crashes, retain engineering experts to evaluate guard performance, and hold negligent trucking companies accountable.

Call 610-255-7500 for a free consultation. We serve truck accident victims in Pennsylvania, New Jersey, Maryland, and New York.