Action for personal injuries arising out of an automobile collision. Jury verdict was for Ruby Miller in the amount of $10,000.00 for her injuries and James Miller in the amount of $3,500.00 for past and future medical expenses, additional help in the home and on the farm, and past and future loss of his wife’s companionship, services, society and consortion. Defendant raises three allegations of prejudicial error: (1) as to the admission of testimony of plaintiffs’ medical expert, over objection, as to Mrs. Miller’s possible fu *294 ture medical treatment; (2) in allowing Mrs. Miller and her husband to testify over objection as to the number of their children, give their names and ages, and to identify some of them as present in the courtroom on the day of trial; and (3) refusal to allow inquiry by defendant’s counsel as to whether Mrs. Miller was wearing a seat belt at the time the collision occurred.
The facts bearing on these issues, taken in the light required of us by the verdict for plaintiffs, are that the accident furnishing the basis for this action occurred in the State of Illinois where plaintiffs were residents. Defendant is a resident of Missouri. As Mrs. Miller was proceeding toward her home from a shopping trip she noticed a woman standing in the road waving at her to stop and also noticed that an automobile was off of the road near where this woman was standing. Upon stopping the 1966 automobile belonging to the plaintiffs, Mrs. Miller discovered this woman, later identified as a Mrs. Clark, was injured. She drove Mrs. Clark to a farm house, a distance of about a city block, where they made some telephone calls to get assistance. She then put Mrs. Clark in her automobile and started to bring her into town for medical assistance. As she neared the spot where she had picked up Mrs. Clark she noticed a car coming around a curve and down a hill immediately ahead of her. This was the defendant who, when Mrs. Miller first saw him, was then in the center of the highway. She immediately began applying her brakes and driving over toward the righthand side of the road. Prior to the time the impact occurred she was completely stopped and off the road as far as she could get her automobile without it falling down the ditch Mrs. Clark’s automobile had descended. Defendant testified that as he approached the scene he noticed the Clark car in the ditch and was looking at it, and when he looked back at the road he saw Mrs. Miller’s automobile right in front of him. She had been stopped for a short period of time and she had had time to brace herself before the impact occurred.
Taking the view the law of Illinois governed the necessity for and form of the allegations of their petition plaintiffs alleged therein that neither the collision nor Mrs. Miller’s injuries were caused or contributed to by her negligence. Defendant’s answer was a general denial and also set up the defense that the accident and Mrs. Miller’s injuries were caused by her contributory negligence. Plaintiffs filed a motion for a more definite statement seeking to have defendant allege the specific acts or omissions to act which he claimed constituted Mrs. Miller’s contributory negligence. The motion was sustained and defendant amended its answer setting out numerous allegations of alleged careless and negligent conduct by Mrs. Miller. That pertinent to this appeal is that it was alleged she “* * * carelessly and negligently failed to wear her seat belt.” This amendment was accomplished in chambers on the day of and immediately prior to trial. Plaintiffs’ counsel then moved the amended answer as to Mrs. Miller’s contributory negligence in failing to wear her seat belt be stricken and defendant’s counsel be instructed not to mention it or argue it. After hearing argument on the matter the trial court sustained plaintiffs’ counsel’s motion.
At that time and thereafter during the course of the trial defendant made numerous requests of the trial court for permission to inquire of various witnesses concerning seat belts in the plaintiffs’ car, whether or not they were being used on this occasion, and their effect on this accident. The trial court denied all such requests. As a result of such denials defendant made the following offers of proof which the trial court refused: that Mrs. Miller did not have her seat belt engaged at the time of this accident; that the automobile she was driving was equipped with seat belts; and that the Illinois state patrolman who investigated the accident “had training concerning the use of seat belts *295 and that their use does minimize injuries; that the State Patrol recommends their use and that he is cognizant of the fact that the United States Congress has recommended their use as a safety feature.” Defendant also made an offer of proof that if permitted to do so the treating physician would testify Mrs. Miller’s injury would have been less serious had she been wearing seat belts.
Neither in the original answer nor in the amendment made in chambers the day of trial did defendant raise any issue as to mitigation of damages. Defendant does not raise any allegation of error on this appeal as to the trial court’s action with regard to striking from his answer the reference to Mrs. Miller’s failure to use her seat belt.
Mrs. Miller’s major injury was a posterior superior dislocation of the hip joint with a fracture of the posterior rim of the socket or acetabulum of the pelvis. The testimony was her injuries were permanent. Mr. Miller testified to special damages totalling $2,409.42. It is unnecessary to burden this opinion with detailed facts bearing upon defendant’s allegation of error as to the admission of testimony by plaintiffs’ medical expert, over objection, as to the necessity for, description, and cost of possible future surgical procedures for Mrs. Miller. It is sufficient to state the medical expert testified certain conditions sometimes develop from injuries to the hip joint such as sustained by Mrs. Miller and that he could not tell at the time of trial whether or not such condition might exist in the future. He was then allowed to relate “other surgical operative” procedures “possibly necessary” in the event such a condition did develop. He testified these could include some four weeks of hospitalization and two or three years of postoperative visits accompanied by physiotherapy. He gave his estimate as to the surgical fees for the operation as being approximately $500.00 to $600.00 and the hospital rate at approximately $33.00 per day for the four-week stay. His testimony was that he did not expect or anticipate this condition to develop in Mrs. Miller’s hip and that there was nothing in existence at the time of trial indicating future development of a condition requiring such procedures and treatment.
Over objection that evidence relating to the number of plaintiffs’ children, their names or ages was immaterial, irrelevant and introduced only for the purpose of invoking prejudice and sympathy, Mr. Miller was allowed to testify they had four children and to give their names and ages. Later during the trial Mrs. Miller was asked if they had four children and answered they had four and that three of these were in the audience in the courtroom.
With respect to defendant’s first allegation of prejudicial error it is clear plaintiffs’ medical expert was allowed to testify as to a condition which could but which he did not then know would develop, which he did not expect or anticipate occurring, and of which he could then, some two years and eight months after the accident, see no evidence. Such testimony is markedly distinguishable from that involved in the line of cases represented by Stephens v. Guffey, Mo.,
We also hold that, under the facts and circumstances of this case, it was error to permit the plaintiffs to testify as to the number of their children, give their names and ages, and comment upon the presence of three in the courtroom. With regard to the comment three of the children were present in the courtroom the transcript discloses the question asked was: “And you all have four children ? A.
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Four children, three — (interrupted)” When the interruption was completed the testimony given was that three of the children were in the courtroom. The comment regarding their presence was not responsive to the question and was clearly objectionable, subject to a motion to strike and to have the jury disregard the answer. In passing upon the other testimony regarding the number and names and ages of the children, defendant relies upon Donze v. Swofford, Mo.App.,
To hold that the trial court’s actions as to either of these two contentions constitute error does not dispose of the matter nor require reversal. Plaintiffs contend that even if the trial court did commit error in its rulings as to these two points, such error cannot be prejudicial as this evidence goes only to the issue of damages and defendant has waived these errors by not advancing any contention the damages awarded were excessive.
There are cases which hold that incompetent evidence on a material issue is presumed prejudicial unless clearly shown to be otherwise and that the burden of so showing is on the one introducing the evidence. An example of such a line of cases is to be found in Schears v. Missouri Pac. R. Co., Mo.,
On the other hand plaintiffs rely upon the statement of this court in Rogers v. Spain, Mo.App.,
There are some early cases of the Supreme Court of this state often cited in support of the contention a claim of exces-siveness is necessary else the improper admission of evidence going to the measure of damage constitutes harmless error. They do not so hold. In Courtney v. Blackwell,
So far as this writer has been able to discover there is only one case wherein the Supreme Court has squarely ruled this issue. In Anderson v. Bell, Mo.,
The remaining issue is plaintiffs’ objections and defendant’s offers of proof as to Mrs. Miller’s failure to use her seat belt. At the outset it should be carefully kept in mind that defendant’s contentions of alleged error as to this issue go purely and solely to the proof of the allegation of plaintiffs’ petition, required by Illinois law, that she was in the exercise of due care for her own safety. The result is that the rule of Anderson v. Bell, supra, as to harmless error in the absence of an allega *298 tion of excessiveness cannot apply as defendant’s contentions do not go to the amount of damages.
It is too well accepted to require citation that matters affecting the substantive rights of the parties must be governed by the law where the collision occurred; Illinois. Rhyne v. Thompson, Mo.,
Is there any valid Illinois case on the subject? There is no Illinois statute re-, quiring the use of such devices and the only reported case upon the subject is ambiguous and due to later decisions, of doubtful validity. Mount v. McClellan,
The first.is that, as recited in that opinion, “ * * * the plaintiff was asked, on cross-examination, whether or not his car was equipped with seat belts. An objection to this question was overruled and the plaintiff answered that his car was not equipped with seat belts.” Jury verdict was for plaintiff who asked for a new trial alleging inadequacy of the verdict
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and error in allowing inquiries as to seat belts. The trial court sustained plaintiff’s motion on both grounds. The appellate court reversed that decision. As to the seat belt issue the court in Mount relied upon and adopted Bentzler v. Braun, 1967,
Second, even if, as defendant, we were to rely solely upon the language of the opinion set out above, disregarding the fact that language is obiter, there are equally compelling reasons we cannot hold Mount states the law as to the use of seat belt issue presently in force in Illinois. A brief history is necessary to properly understand why this is so. Mount was handed down in March of 1968. In September of 1967 the writer of Mount handed down Maki v. Frelk,
It is inescapable that Mount is not authority for defendant’s contention. The result is that there is no law in Illinois on the subject and we are free to apply our own.
This decision then presents one of first impression
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in this state and we are firmly convinced that to allow such evidence is
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improper. In this regard we find ourselves in full accord with the reasoning and result of Romankewiz v. Black, 1969,
It is apparent the doctrine of assumption of risk will not sustain a decision allowing the admission of such evidence. Before one can assume a risk he must know it exists. While travel in an automobile has reached the point where it can perhaps be said to be more dangerous than ever before, it has not reached the point where we could hold that an accident is so likely to occur that each and every time one gets into an automobile he must be held to have assumed the risk of injury. Romankewiz also disposed of the theory of avoidable consequences or mitigation of damages as allowing such evidence, stating: “This argument, it seems to us, is disposed of by a very simple bit of logic: if there is no duty to buckle a seat belt, failure to do so cannot be held a breach of duty to avoid consequences or minimize damages. * * The seat-belt situation does not fit the doctrine of avoidable consequences because the failure to fasten the seat belt occurred before the defendant’s negligent act and before the plaintiff’s injury. (Citing cases and articles.) Nevertheless, it is closely analogous. The same considerations, however, which reject the proposition that a motorist’s failure to fasten a seat belt whenever he travels is negligence, impel the rejection of the theorem that such a failure to should reduce his damages. If *301 there is no duty to fasten a seat belt, such a failure cannot be held to be a breach of the duty to minimize damages. Even were there a statutory requirement that a motorist fasten his seat belt every time he ventured upon the highway — a requirement which would create the duty and provide the standard now lacking — the complicated task of damage apportionment would ‘invite verdicts on prejudice and sympathy contrary to the law,’ create ‘unnecessary conflicts in result,’ and ‘degrade the law by reducing it to a game of chance.’ ” 6
Accordingly, we hold that as a matter of law evidence as to the failure to use a seat belt was inadmissible to show Mrs. Miller’s lack of due care. Such a matter is properly for the legislature. The trial court correctly ruled that issue.
The judgment is affirmed.
Notes
. Verdict was for $1,000.00. The opinion recites plaintiff alleged special damages of $2,440.65, but it does not state the evidence as to that item sustained that sum.
. This interpretation of the opinion has been suggested, albeit not in the detail stated here. (Illinois Bar Journal, Dec. 1968, Vol. 57, No. 4, pages 320-326.)
. No such evidence was offered or given at the trial. The only question asked was that of the plaintiff as to whether his car was so equipped and the only testimony given was his answer it was not.
. Brown v. Bryan, Mo.,
. Note that the Missouri statute is directed to automobile manufacturers and dealers in that it forbids motor vehicles “manufactured or assembled” after June 30, 1964 to be “sold or registered" unless equipped with seat belts. Presumably seat belts could thereafter be torn out. Contrast that statute with the provisions of § 307.170, RSMo 1959, V.A.M.S., requiring every motor vehicle to be equipped with the safety devices therein enumerated, thus providing for their continued existence. It follows this statute would not of itself authorize the inquiry as to whether the Miller automobile was equipped with seat belts.
. In addition to the authorities collected in Romankewiz, supra, see Remington v. Arndt,
