The United States Court of Appeals for the First Circuit (Coffin, Sеnior Circuit Judge) has certified the following question of law, see SUP. CT. R. 34:
Under New Hampshire law, in a crashworthiness or enhanced injury case, does the plaintiff bear the burden of demonstrating the specific nature and extent of the injuries attributable to the manufacturer, or does the burden of apportionment fall on the defendant once the plaintiff has proved causation?
Trull v. Volkswagen of America, Inc.,
We adopt the court of appeals’ recitation of the facts. In February 1991, the plaintiffs, David and Elizabeth Trull, and their two sons, Nathaniel and Benjamin, were traveling in New Hampshire when their Volkswagen Vanagon slid on black ice and collided with an oncoming car. Id. at 91. Both parties agree that Nathaniel and Benjamin were seated in the rear middle bench seat of the Vanagon, which was equipped with lap-only seatbelts, and were wearing the available lap belts. Benjamin died in the accident, and both Elizabeth and Nathaniel suffered severe brain injuries. Id.
In this diversity products liability action, the plaintiffs sought damages from the defendants “on the ground that defects in the design of the Vanagon made their injuries more severe than they otherwise would have been.” Id. “Plaintiffs had two primary theories of recovery: (1) the Vanagon was defective because it was a forward control vehicle constructed in such a way that it lacked sufficient protection against a frontal impact, and (2) the Vanagon was defeсtive because the rear bench seats, on which Nathaniel and Benjamin were seated, did not have shoulder safety belts as well as lap belts.” Id. at 92. The plaintiffs contend that the defendants are liable in, inter alia, negligence and strict liability because the automobile was not crashworthy. See id.
The United States District Court for the District of New Hampshire granted summary judgment for the defendants on a breach of warranty claim, and both Elizabeth and David Trull’s claims were dismissed with prejudice. Id. The trial proceeded with Nathaniel’s
The plaintiffs appealed to the United States Court of Appeals for the First Circuit, arguing, among оther things, that the district court “improperly imposed on plaintiffs the burden of proving the nature and extent of the enhanced injuries attributable to the Vanagon’s design.” Id. at 92. Recognizing that the question “of who, under New Hampshire law, should bear the burden in a so-called ‘crashworthiness’ case, poses sophisticated questions of burden allocation involving not only a choice of appropriate precedent but also an important policy choice,” the court of appeals granted the plaintiffs’ motion to certify the question to this court. Id. at 92, 103.
The plaintiffs’ theory of liability for defective design is commonly referred to as the “crashworthiness,” “second collision,” or “enhanced injury” doctrine. See Caiazzo v. Volkswagenwerk A. G.,
The crashworthiness doctrine “extends the scope of liability of a manufacturer to the situations in whiсh the construction or design of its product has caused separate or enhanced injuries in the course of an initial accident brought about by an independent cause.” Bass v. General Motors Corp.,
In order to answer the certifiеd question, we first must decide whether a manufacturer may be held liable for enhanced injuries arising from a defective design. See Smith,
Under New Hampshire ■ law, the duty of a manufacturer “is limited to foreseeing the probable results of the normal use of the product or a use that can reasonably be anticipated.” McLaughlin v. Sears, Roebuck,
We conclude, therefore, that our case law supports the Larsen approach. While we do hot hold that manufacturers are “insurers” for defectively designed vehicles, see Price,
where the injuries sustained are separate and divisible . . ., the burden of proof remains solely upon the plaintiff[s], including the burden of proving “enhancement,” i.e., the plaintiff[s] must prove which of the several injuries are attributable to the manufacturer’s defective product and the degree of “enhancement” occasioned by the product as distinguished from the injuries flowing from the third party’s acts of negligence.
Lee,
Whеn, however, the plaintiffs receive injuries that are indivisible, courts are split as to whether the plaintiffs or the defendants bear the burden of segregating the injuries caused by the automobile’s defect. See, e.g., Polston v. Boomershine Pontiac-GMC Truck, Inc.,
The defendants urge us to adopt the minority approach referred to as the “Huddell-Caiazzo” aрproach, which places the burden on the plaintiffs to prove the nature and extent of their enhanced injuries. See Huddell v. Levin,
Under the Huddell-Caiazzo approach,
[f]irst, in establishing that the design in question was defective, the plaintiff[s] must offer proof of an alternative safer design, practicable under the circumstances. Second, the plaintiff[s] must offer proof of what injuries, if any, would have resulted had the alternative, safer design been used. Third, the plaintiff[s] must offer some method of establishing the extent of enhanced injuries attributable to the defective design.
Caiazzo,
The plaintiffs, conversely, urge us to adopt the majority approach referred to as thе “Fox-Mitchell” approach, derived from Fox v. Ford Motor Co.,
Under the Fox-Mitchell approach, the plaintiffs must “prove only that the design defect was a substantial factor in producing damages over and above those which were probably caused as a result of the original impact or collision.” Trull,
The principles that guide our answer to the question of which approach New Hampshire should adopt are derived from products liability law grounded in both negligence and strict liability. We therefore review fundamental principles of these areas.
A design defect exists “when the product is manufactured in conformity with the intended design but the dеsign itself poses unreasonable dangers to consumers.” Thibault v. Sears, Roebuck & Co.,
“[Cjausation is a necessary element in both negligence and strict liability actions.” LeFavor v. Ford,
While “the plaintiff has the burden of proving that the defendant’s negligent'act. . . contributed to cause the plaintiff’s damages,” id.
In crashworthiness cases involving indivisible injuries, we conclude that the plaintiffs must prove that a “design defect was a substantial factor in producing damages over and above those which were probably caused as a result of the original impact or collision. Once the plаintiff[s] make[] that showing, the burden shifts to the defendants] to show which injuries were attributable to the initial collision and which to the defect.” Trull,
This answer is supported by our treatment of products liability actions, where we have, based upon a “compelling reason of policy,” abandoned the higher burden of proof of negligence actions in lieu of adopting the less stringent burden of proof of strict liability. Bagley v. Controlled Environment Corp.,
In contrast, “[a]doption of the Huddell[-Caiazzo] position takes away the incentive of automobile manufacturers to design their products in a responsible fashion.” Polston,
We agree with the Mitchell court’s rejection of Huddell on the basis that a plaintiff would be “relegated to an almost hopeless state of never being able to succeed against a defective designer,” Mitchell,
it is better that a plaintiff, injured through no fault of his own, take nothing, than that a wrongdoer pay more than his theoretical share of the damages arising out of a situation which his wrong has helped to create. In other words, the rule is a result of a choice made as to whеre a loss due to*266 failure of proof shall fall — on an innocent plaintiff or on defendants who are clearly proved to have been at fault.
Id. at 1208; see RESTATEMENT (THIRD) OF TORTS: PRODUCTS LIABILITY § 16 comment d at 240, We have adopted similar reasoning in holding.that two dr more tortfeasors may be jointly and severally liable where their negligence, through their independent acts, produces a single, indivisible injury. Carpenter v. Company,
We dо not accept the defendants’ contention that the following language of Pillsbury-Flood v. Portsmouth Hospital,
[T]he plaintiff -retains the ultimate burden of persuasion ■. ■. ... This rule ensures that defendants will not have to defend against improbable claims, and that defendants will not have to disprove the element of causation. Proving a negаtive poses practical and theoretical problems that should not be placed on defendants. Moreover, this rule ensures that juries will not have to engage in speculation and conjecture in determining whether liability exists.
Id. at 304,
As the court of appeals recognized, this rule addresses whethеr “the burden of negating causation should have been shifted to the defendants.” Trull,
The defendants finally contend that because a manufacturer will normally defend a crashworthiness claim by arguing that no defect in the'vehicle existed, or that the plaintiffs’ injuries could not have been prevented due to the severity of the accident, requiring them to apportion the plaintiffs’ injuries would illogically “require the manufacturer to prove what it vehemently denies, that the plain
This argument misses the mark. Defendants regularly contest the extent of plaintiffs’ injuries while at the same time denying liability for the underlying causes. Requiring the defendants to apportion the plaintiffs’ injuries does not require them to prove that which they deny. The burden of proving causation is on the plaintiffs. The only burden on the defendants is to apportion the plaintiffs’ injuries betweеn those caused by the first collision, by the alleged design defect, and by another source, if any.
In summary, the Fox-Mitchell approach and subsequent burden shifting is necessary only where the plaintiffs’ injuries are indivisible. See, e.g., Mitchell,
Remanded.
