The crashworthiness doctrine holds a vehicle manufacturer liable for injuries that a design defect made worse in a crash, even if the manufacturer had nothing to do with causing the crash itself. The rule recognizes that collisions are a normal, foreseeable part of driving and that a car’s job includes protecting the people inside when one happens. If a safer, feasible design would have left you with lesser injuries, the manufacturer owes you the difference.
Where the Rule Came From
For years, carmakers argued they had no duty to design for crashes because vehicles aren’t “intended” to collide. The Eighth Circuit rejected that reasoning in Larsen v. General Motors Corporation in 1968, holding that collisions are “a frequent and inevitable contingency of normal automobile use” and that manufacturers must use reasonable care so their vehicles don’t subject occupants to unreasonable injury risk when an impact occurs.1Justia Law. Larsen v. General Motors Corporation, 391 F.2d 495 The court was careful to say manufacturers don’t have to build accident-proof cars. They just have to account for the reality that crashes happen.
Larsen also set the damages rule that still governs these cases. A manufacturer whose defect didn’t cause the accident isn’t on the hook for everything that happened. The manufacturer pays only for the additional harm the defect caused “over and above the damage or injury that probably would have occurred as a result of the impact or collision absent the defective design.”1Justia Law. Larsen v. General Motors Corporation, 391 F.2d 495 That line between baseline crash injuries and enhanced injuries from the defect runs through every crashworthiness case.
The Second Collision
Crashworthiness cases focus on what engineers call the second collision. The first collision is the vehicle striking something — another car, a tree, a barrier. The second collision happens a fraction of a second later, when the occupant’s body strikes the inside of the cabin: steering column, dashboard, door panel, window glass. The second collision is what typically kills people or causes the most serious injuries. Modern vehicle safety engineering exists to manage it.
When a car stops suddenly, the people inside keep moving at whatever speed the car was traveling until something decelerates them. A well-designed vehicle uses crumple zones to absorb energy and extend the deceleration time, giving airbags and seatbelts a chance to slow the occupant more gradually. If those systems fail, or if the passenger compartment collapses inward, the occupant strikes rigid components at speed. Roof intrusion during a rollover is a textbook example: a collapsing roof reduces the survival space inside the cabin and can cause fatal head and spinal injuries at moderate speeds. The question in every crashworthiness case is whether the vehicle’s interior acted as a protective shell or as a source of extra harm.
What You Have to Prove
The hardest part of a crashworthiness case is separating the injuries the crash would have caused anyway from the extra injuries the defect produced. A driver rear-ended at 40 mph might suffer whiplash no matter how well the car was designed, but a collapsing seatback that launches that driver into the rear cabin causes something far worse. Courts have split on how plaintiffs must draw that line, and the split matters a great deal.
The Huddell Approach
Under Huddell v. Levin (3d Cir. 1976), the plaintiff carries the full burden. That means proving three things: that a safer, feasible alternative design existed; what injuries would have occurred under that better design; and the specific extent of the additional injuries caused by the actual defective design. If the plaintiff can’t make the comparison with reasonable precision, the case fails. Jurisdictions following this standard expect detailed engineering and medical testimony mapping exactly where baseline injuries end and enhanced injuries begin.
The Mitchell Approach
The Eighth Circuit went the other way in Mitchell v. Volkswagenwerk (8th Cir. 1982), calling the Huddell requirement “proving the impossible” in many cases. Under Mitchell, the plaintiff needs to show only that the design defect was a substantial factor in producing harm beyond what the original impact would have caused. The burden then shifts to the manufacturer to prove which injuries it didn’t cause. If the injury is indivisible — death, paralysis, traumatic brain injury — and there’s no reasonable way to split it between the crash and the defect, the manufacturer can be liable for all of it as a joint tortfeasor.
Which rule applies depends on where the case is filed, and the practical difference is enormous. Under Huddell, a plaintiff with catastrophic but indivisible injuries faces a nearly impossible evidentiary task. Under Mitchell, the manufacturer, which has the crash-test data and design records, bears the burden of parsing the harm. Plaintiffs’ attorneys weigh this split carefully when choosing a forum.
Either way, these cases run on expert testimony. Accident reconstruction engineers model the crash with the actual vehicle design and then again with the proposed alternative. Biomechanical experts tie the forces in each scenario to specific injury patterns. The cost of building that evidentiary foundation is one reason crashworthiness claims generally involve only serious injuries. The economics don’t support the litigation for minor harm.
Defects That Trigger Liability
Manufacturer liability attaches when a specific component fails to provide the protection a reasonable consumer would expect, or when a safer alternative design was feasible. The defect doesn’t have to cause the accident. It has to make the injuries worse.
Structural and Restraint Failures
Roof crush is one of the most heavily litigated defect categories. In a rollover, a weak roof can collapse into the passenger compartment and cut headroom to the point where occupants suffer skull fractures or spinal cord injuries they would have survived with adequate clearance. Federal Motor Vehicle Safety Standard 216 sets minimum roof strength, but plaintiffs regularly argue those minimums are inadequate for real-world rollover speeds and that reinforced pillars were feasible at modest cost.
Seatbelt failures are another major source of claims. When a retractor doesn’t lock during sudden deceleration, or when a buckle releases under crash forces, the occupant becomes an unrestrained projectile. Seatback failures work similarly: in a rear-end collision, a weak front seat frame can collapse backward, launching the driver into the rear seat area and crushing anyone sitting behind them. When internal evidence shows a manufacturer chose a lighter frame to save weight, that cost calculation can become evidence of an unreasonable design trade-off.
Airbag defects cut both ways. A bag that fails to deploy leaves the occupant unprotected during the second collision. An airbag that deploys with excessive force can itself cause harm. Research has documented that roughly 8% of airbag-related injuries involve deployment burns from high-temperature gases, chemical exposure from alkaline compounds like sodium hydroxide, or friction injuries ranging from skin abrasions to spinal fractures.2International Journal of Surgery Case Reports. A Case Report on Air Bag Induced Skin Burn in a Road Traffic Injury: An Experience Fuel system placement rounds out the traditional categories. A poorly positioned fuel tank that ruptures in a rear-end collision and causes a post-crash fire is a classic crashworthiness defect.
Electric Vehicle Battery Hazards
Electric vehicles introduce a crashworthiness risk that didn’t exist a generation ago. Lithium-ion battery packs can experience thermal runaway after a crash, a chain reaction where damaged cells generate uncontrollable heat and can ignite a fire that is extremely difficult to extinguish. A new federal standard, FMVSS 305a, addresses this directly. It requires that from the moment of impact until one hour after the crash test sequence, there be no evidence of fire or explosion anywhere in the vehicle. The rule also limits electrolyte leakage to no more than 5.0 liters and prohibits any visible leakage into the passenger compartment.3eCFR. Standard No. 305a – Electric Powertrain Integrity Mandatory compliance begins in September 2027 for lighter vehicles and September 2028 for heavier ones. Litigation involving pre-standard vehicles will test whether manufacturers met the duty of reasonable care even before the regulation took effect.
Advanced Driver Assistance Systems
Automatic emergency braking, lane-keeping assist, and other advanced driver assistance systems add another layer. NHTSA finalized FMVSS No. 127, which will require automatic emergency braking on all passenger cars and light trucks by September 2029. The standard requires that vehicles stop and avoid contact with a lead vehicle at speeds up to 62 mph, and apply brakes automatically up to 90 mph when a collision is imminent.4NHTSA. NHTSA Finalizes Key Safety Rule to Reduce Crashes and Save Lives When these systems malfunction, the resulting claims can sound in both traditional negligence (the system caused the crash) and crashworthiness (the system failed to prevent or mitigate a foreseeable one).
Why Federal Compliance Isn’t a Shield
Manufacturers routinely argue that passing federal safety standards should end the inquiry. The statute does contain an express preemption provision: when a Federal Motor Vehicle Safety Standard is in effect, states can only impose safety requirements on the same performance aspect if they are identical to the federal standard.5Office of the Law Revision Counsel. 49 USC 30103 – National Traffic and Motor Vehicle Safety Act Read alone, that would seem to wipe out most state tort claims.
But the same statute contains a savings clause that changes the picture: “Compliance with a motor vehicle safety standard prescribed under this chapter does not exempt a person from liability at common law.”5Office of the Law Revision Counsel. 49 USC 30103 – National Traffic and Motor Vehicle Safety Act Because most FMVSS set minimum performance floors rather than ceilings, a state tort claim that effectively demands a higher standard of safety generally survives. A vehicle can pass every federal test and still be defective if a feasible safer design existed.
The main exception comes from Geier v. American Honda Motor Co. When a federal standard deliberately offers manufacturers a choice among different safety approaches, as the airbag phase-in rules under FMVSS 208 did, a state tort claim that would eliminate that choice by effectively requiring one particular approach can be preempted as conflicting with the federal regulatory objective.6Cornell Law School. Geier v. American Honda Motor Co. If the FMVSS is a floor, state tort claims survive. If the FMVSS deliberately preserves manufacturer choice as a regulatory strategy, state claims that override that choice may not.
Defenses That Can Shrink or Kill a Claim
Comparative Fault and Seatbelts
In comparative negligence states, a manufacturer can argue that the plaintiff’s own conduct contributed to the enhanced injuries. The most common version is the seatbelt defense. If the plaintiff wasn’t belted, the manufacturer contends that some or all of the enhanced injuries would have been prevented by proper belt use. In jurisdictions that allow this, the jury typically works through two steps: first identifying which injuries the belt would have prevented, then apportioning fault between the plaintiff and the manufacturer for those avoidable injuries.
Many states have limited or eliminated this defense by statute. Illinois, Texas, and Connecticut prohibit courts from treating seatbelt non-use as evidence of negligence or using it to reduce damages. Others allow the evidence but cap the reduction. The availability of this defense varies significantly by jurisdiction.
Statute of Repose
Many states impose a statute of repose that cuts off product liability claims entirely after a fixed number of years from the date the product was first sold or delivered, regardless of when the injury occurs. For vehicles, this window typically runs 10 to 15 years depending on the state. Unlike a statute of limitations, which starts when the injury happens, a statute of repose can bar a claim before the plaintiff even knows they have one. Someone injured in a 14-year-old vehicle with a design defect may find the repose period has already expired. There are very few exceptions, and the deadline matters especially for crashworthiness claims because vehicles stay on the road for many years after their original sale.
What You Can Recover
Damages in a crashworthiness case cover only the enhanced portion of the harm: the difference between what the crash would have caused in a properly designed vehicle and what actually happened. That distinction applies to every category of recovery.
Economic damages include the additional medical costs attributable to the defect-enhanced injuries. If a properly managed crash would have meant a few weeks of physical therapy, and the actual crash meant spinal fusion surgery and months of inpatient rehabilitation because of a roof collapse, the manufacturer pays for the difference. Long-term rehabilitative care for catastrophic injuries like paralysis can run well into seven figures over a lifetime. Lost wages and diminished future earning capacity work the same way. The manufacturer covers the income loss caused by the enhanced disability, not the baseline recovery time from the underlying crash.
Non-economic damages compensate for pain, emotional distress, disfigurement, and lost quality of life attributable to the enhanced injuries. These awards tend to be substantial because the injuries are often severe and permanent. Juries in these cases regularly return awards in the high six or low seven figures for non-economic harm alone. Most states do not cap non-economic damages in product liability cases, though a few impose limits in specific contexts.
Punitive damages become available when a manufacturer’s conduct crosses from negligent design into something more deliberate. The threshold generally requires showing that the manufacturer acted with conscious disregard for consumer safety, for example by discovering a dangerous defect through internal testing and continuing to sell the vehicle rather than issuing a recall or redesign. Grimshaw v. Ford Motor Co. established that “callous and conscious disregard of public safety by those who manufacture and market mass produced articles” satisfies the standard for punitive damages in a product liability design defect case.7Justia Law. Grimshaw v. Ford Motor Co., 119 Cal.App.3d 757
The Supreme Court has placed constitutional limits on punitive awards. In State Farm v. Campbell, the Court held that “few awards exceeding a single-digit ratio between punitive and compensatory damages will satisfy due process,” and that when compensatory damages are already substantial, even a lower ratio may reach the constitutional limit.8Justia U.S. Supreme Court. State Farm Mut. Automobile Ins. Co. v. Campbell, 538 U.S. 408 Courts also weigh the degree of reprehensibility of the manufacturer’s conduct as the most important factor in assessing whether a punitive award is reasonable.9Justia U.S. Supreme Court. BMW of North America, Inc. v. Gore, 517 U.S. 559 Internal documents showing a manufacturer knew about a defect and calculated that future claims would cost less than a fix are the kind of evidence that can push a jury toward a significant punitive verdict.
Protect the Vehicle Before Anything Else
The car itself is the single most important piece of evidence in a crashworthiness case. Once it is repaired, scrapped, or sent to a salvage yard and crushed, the ability to inspect the defect, download event data recorder information, and document the condition of safety systems is gone. Courts can impose sanctions for spoliation when a party destroys or fails to preserve relevant evidence, but those sanctions are a poor substitute for the evidence itself. Anyone who suspects a vehicle defect contributed to serious injuries should move immediately to prevent the vehicle from being altered or destroyed. Notify the insurance company and any towing or salvage company in writing that the vehicle must be preserved, and talk to a product liability attorney before authorizing any repairs.