OPINION OF THE COURT
In а strict products liability action based upon design defect, whether the product as marketed was reasonably safe for its intended use is determined by whether a reasonable person with knowledge of the potential for injury of the product and of the available alternatives, balancing the product’s risks against its utility and costs and against
I
On June 8, 1974, Irving Cohen was operating his 1973 Chevrolet Malibu. It had been purchased by him from defendant Kinney Motors in October, 1972, and had been driven approximately 12,000 miles during the 18 months between the time it was delivered to him new on December 22, 1972 and the accident. During that period no difficulty had been experienced with the acceleration system of the car. Seeking to parallеl park on the west side of East 49th Street in Brooklyn, Cohen brought the car to a stop on that side and put it in reverse, when, according to him, the car shot backward at high speed and could not be stopped although he had his foot on the brake. It proceeded backward in an arc some 70 feet to the east side of the street, through an open space on that side where it jumped the curb, stopping only when it hit the wall of a building. Plaintiff, Astor Cover, who was walking along the east sidewalk at that point, was crushed against the wall by the car, as a result of which one leg was amputated above the knee and the other required a brace. With a prosthesis and the brace he now can stand only with the help of canes with forearm extensions.
An action was promptly begun on behalf of Cover and his wife against Cohen based on negligence in the operation of the car and in that connection Cohen’s examination before trial was takеn. In August, 1976, after the death of Cohen and a substitution of counsel for plaintiffs, the complaint was amended to add as defendants Kinney Motors, the
A bifurcated trial resulted in the jury answering affirmatively interrogatories asking (1) whether Irving Cohen was negligent in the operation of the Chevrolet and whether that was a proximate cause of the accident, (2) whether General Motors was negligent and whether its negligence was a proximate cause of the accident, (3) whether the throttle return spring of the Chevrolet was defective and whether the defect existed at the time it left the possession of General Motors and Kinney, and (4) whether the Chevrolet was unreasonably dangerous as a result of the defect in the spring and the defect a proximate cause of the accident. Following the space for answering the fourth interrogatory was the direction “If your answer is ‘yes’ then you must also find as against Kinney Motors as the seller (of the vehicle) on this issue of strict liability”. Degrees of fault were assessed by the jury as Irving Cohen 2%, General Motors 94% and Kinney Motors 4%, and damages were assessed in favor of Astor Cover at $6,000,000 and in favor of Pearl Cover, on her derivative cause of action, at $2,000,000.
The Trial Judge submitted the case to the jury as to Cohen on the basis of negligence, as to Kinney solely on the basis оf strict liability and as to General Motors on the basis of both negligence and strict liability. Following the jury’s responses noted above, he granted Kinney’s motion for judgment on its cross complaint against General Motors “for indemnification as a matter of law” and granted General Motors’ motion to reduce the verdicts to the amounts demanded in the complaint ($3,000,000 and $1,000,000, respectively), but otherwise denied General Motors’ motion for judgment notwithstanding the verdict and for a new trial.
General Mоtors appealed to the Appellate Division from the judgment in favor of the Covers but not from the judgment over in Kinney’s favor, and Kinney filed a notice of appeal, which it designated as “protective,” from the judgment against it in plaintiffs’ favor. In a memorandum which discussed only the excessiveness of the verdicts, but
The appeal raises questions concerning the propriety of the introduction in evidence of (1) a Federal motor vehiсle safety standard which postdated the manufacture of the car involved in the accident, (2) the throttle spring removed from the Cohen vehicle some 15 months after the accident, (3) a statement made by Irving Cohen to a police officer shortly after the accident and recorded in his report on the accident, and (4) a technical service bulletin with respect to the carburetor spring of the 1973 Chevrolet sent to its dealers by General Motors under date of Jаnuary 22, 1974.
II
The combined effect of our decisions in Caprara v Chrysler Corp. (
Plaintiffs recognize that such is the present rule but urge upon us thе value of a single standard for all such cases and argue that in any event the determinative time should be the date of the accident rather than the date, of manufacture. We decline the single standard invitation because of the different inquiries involved in the different types of cases, as expounded in Caprara and Rainbow (see, also, Opera v Hyva, Inc.,
The references in Caprara and Rainbow to “postaccident” modifications are not deemed significant; the adjective was simply descriptive of the modifications under discussion in those cases. Other language in those and other cases establishes the date of manufacture as the critical time (Caprara,
Admissibility in the present case of evidence concerning Federal motor vehicle safety standard 124 is complicated by the facts that though it was first proposed by the Government in 1969, it is, as finally adopted, applicable only to 1974 and later model vehiclеs; that although the standard itself never came into evidence, the original draft proposal as printed in the Federal Register together with General Motors’ comments on it as it was being developed were admitted together with testimony of the then Director of the National Highway Traffic Safety Bureau, at whose instance the proposed standard was prepared, that the standard had in fact been promulgated prior to the accident and required an acсelerator spring different from that on the Cohen vehicle; and that that testimony and those documents came in as part of plaintiffs’ case on rebuttal.
Beyond peradventure, therefore, the jury became aware, notwithstanding that the standard in the form finally adopted was not received in evidence, that a standard had ultimately been adopted by the Federal Government, that it was adopted prior to the accident and that it required an accelerator spring different from that on the 1973 Chevro
Plaintiffs suggest that General Motors’ involvement “in the rule making procedures is probative of the fact that it did not need a federal standard to inform it that its spring needed replacement.” There are a number of answers. First, the issue before the jury was whether the 1973 Malibu with the production spring it came equipped with was reasonably safe (Voss v Black & Decker Mfg. Co.,
The issue before the jury was whether upon delivery to Irving Cohen in December, 1972 of his 1973 Malibu with the spring then in use by General Motors the car was reasonably safe in design. On that issue admission of evidence concerning the standard promulgated by the National Highway Traffic Safety Bureau in January, 1973
The spring, removed from the Cohen vehicle some 15 months after the accidеnt, was admitted over objection that no proper foundation had been laid and that although it was elongated no explanation of the elongation was offered. Plaintiffs’ argument that it was necessary to introduce that particular spring despite the elongation in order to show the jury what a production accelerator spring looked like is belied by the testimony of the adjuster who removed the spring from the Cohen car that he replaced it with a spring purchаsed at Jamaica Chevrolet. The court’s statement to the jury at the time of admission that the spring was admitted “for the limited purpose of indicating to the jury how it was * * * on the date * * * removed * * * and for that purpose only” and its instruction in the final charge that it is “merely here for the purpose of the witness being able to testify as to the spring he removed from the car” emphasize the error for, absent foundation testimony, both the spring removed from the car 15 months after the accident and “how it was” on the date removed were irrelevant and inadmissible. And while the final charge included the further statement that the spring was not admitted “for the purpose of establishing the condition of the spring or which spring was on the car at the time the car was manufactured or at the time of the accident,” that too compounded the error for it left the jury wholly at a loss as to the significance of the adjuster’s testimony that it was the spring he removed from the car, and was follоwed by the statement that “You have a right to consider all questions and all answers made with regard to that spring if you find it to be relevant in this case.” Bearing in mind the bureau director’s testimony concerning the weakness of the production spring to perform its function and the confusing instructions with respect to the purpose for which the elongated spring was admitted, we conclude that its admission must be deemed prejudicial.
Ill
For the same reasons that govern the Federal standard, the technical service bulletin issued by General Motors some 13 months after delivery of the Cohen Chevrolet was not admissible on the design defect cause of action or the failure to warn cause of action insofar as it turned on the design and risk status of the vehicle at the time of delivery. A manufacturer or retailer may, however, incur liability for failing to warn concerning dangers in the use of a product which come to his attention after manufacture or sale, through advancements in the state of the art, with which he is expected to stay abreast, or through being made aware of later accidents involving dangers in the
Although a product be reasonably safe when manufactured and sold and involve no then known risks of which warning need be given, risks thereafter revealed by user operation and brought to the attention of the manufacturer or vendor may impose upon one or both a duty to warn (Rekab, Inc. v Hrubetz & Co., 261 Md 141; doCanto v Ametek, Inc., 367 Mass 776; Comstock v General Motors Corp.,
What notice to a manufacturer or vendor of problems revealed by use of the product will trigger his postdelivery duty to warn appears to be a function of the degree of danger which the problem involves and the number of instances reported (Comstock,
The nature of the warning to be given and to whom it should be given likewise turn upon a number of fаctors, including the harm that may result from use of the product without notice, the reliability and any possible adverse interest of the person, if other than the user, to whom notice is given, the burden on the manufacturer or vendor involved in locating the persons to whom notice is required to be given, the attention which it can be expected a notice in the form given will receive from the recipient, the kind of product involved and the number manufactured or sold, and the steps takеn, other than the giving of notice, to correct the problem (McLaughlin v Mine Safety Appliances Co.,
IV
Despite the above grounds for reversal as to General Motors, plaintiffs argue that our recent decision in Hecht v City of New York (
All causes of action against Kinney except that predicated on strict liability were dismissed by the Trial Judge. The case went to the jury under instructions that if they found the Cohen vehicle defective and the defect a proximate cause of the accident their verdict should be for plaintiffs even though General Motors or Kinney had no knowledge of the defect, and with interrogatories which contained the direction that if they answered affirmatively the question as to defect and proximate cause “then you» must also find as against Kinney Motors as the seller (of the vehicle) on this issue of strict liability”. Pertinent also is the provision of the judgment granted Kinney on its cross complaint against Genеral Motors that it was “for indemnification as a matter of law.”
As we noted in Hecht v City of New York (
For the foregoing reasons, the order of the Appellate Division should be reversed, with costs, and a new trial granted as to both General Motors and Kinney.
Chief Judge Cooke and Judges Jasen, Jones, Wachtler and Kaye concur; Judge Simons taking no part.
Order reversed, with costs to defendant General Motors against plaintiffs, and a new trial granted as to defendants General Motors and Kinney.
Notes
. Three other rulings are argued by General Motors: that design defect proof was beyond the scope of the bill of particulars, that evidence concerning Irving Cohen’s visit to his doctor on the morning of the accident was improperly excluded, and that certain cross-examination of a police sergeant should not have been allowed. They are either not preserved or do not merit discussion other than to note, as to the bill of particulars point, that paragraph 21 of the bill stated that the vehicle “was defective *** in * * * the design ***of the pull back spring of the carburetor” and paragraph 22(b) specified that the “spring * * * did not release entirely when the accelerator was released” (cf. Caprara v Chrysler Corp.,
. [4] The bulletin was admitted subject to connection, over objection as to relevance, but there does not appеar to have been any specific later ruling that the required connection had been made. Relevance of such a bulletin is, of course, in the first instance for the Trial Judge (Prashker v Beech Aircraft Corp., 258 F2d 602, 608, cert den
. Not considered because not urged during the prior trial is strict liability as it relates to a continuing duty to warn (see Opera v Hyva, Inc.,
