BAKES, Justice.
This is a wrongful death action arising out of a traffic accident in which Nathaniel and Hazel Dawson, husband and wife, were killed when the pickup truck driven by Hazel Dawson was struck by an automobile driven by the defendant Ronald T. Olson, an uninsured motorist. The accident occurred on January 12, 1968. On September 17, 1968, the plaintiffs, the children of Nathaniel Dawson, brought a wrongful death action against Olson. The Dawsons’ automobile insurer, State Farm Mutual Automobile Insurance Company, petitioned to intervene on the ground that because the Dawson’s policy contained an uninsured motorist provision, the insurance company had a vital interest in the outcome of this case. The petition to intervene was granted. The case was tried beginning October 5, 1970, and the jury returned a verdict for the plaintiffs for $75,000. Olson and State Farm both moved for a judgment notwithstanding the verdict or a new trial. On November 27, 1970, the trial court entered judgment notwithstanding the verdict for both the defendant and the intervenor. From this en- ■ try of judgment the plaintiffs appealed.
In Dawson v. Olson, 94 Idaho 636, 496 P.2d 97 (1972), we held that the judgment notwithstanding the verdict had been erroneously granted because there was sufficient substantial evidence to support the verdict, and remanded the case for further proceedings. Upon remand the trial judge granted the defendant- and intervenor-respondents’ motion for new trial. The plaintiffs appealed from that order and, in Dawson v. Olson, 95 Idaho 295 507 P.2d 804 (1973), we affirmed the order granting a new trial. That trial was held on December 10 and 11, 1973, and resulted in a- jury verdict for the defendant. Judgment was entered for the defendant. The plaintiffs moved for a new trial and the motion was denied. The plaintiffs have taken this appeal from the judgment and the denial of their motion for new trial.
The uncontradicted testimony given at the second trial disclosed the following sequence of events preceding the accident. The Dawson pickup was the second in a line of three vehicles that were exiting from Interstate 80N onto Franklin Road, Highway 20-26, at the interchange between the two highways near the eastern city limits of the city of Caldwell. Charles Ragsdale was driving the first vehicle in the line, a semi-truck trailer, which was pulling two 26-foot trailers and which had an overall length of approximately 64 feet. At the top of the exit ramp, where the ramp intersected Franklin Road which passes over Interstate 80N, there was a stop sign, a stop line and a flashing red light. Ragsdale brought his truck to a complete stop at the top of the ramp, then turned left to proceed easterly along Franklin Road away from the city of Caldwell. John H. Montgomery, the driver in the third vehicle in the line on the exit ramp, testified that as the truck moved away from the stop sign the Dawson pick[277]*277up did not drive up to and stop at the stop line or stop sign at the top of the exit ramp; rather, it followed along closely behind Ragsdale’s truck as that truck made a left hand turn onto Franklin Road, never stopping before it entered the intersection. The Dawson vehicle, which was turniiig left to proceed easterly along Franklin Road, was struck by the Olson vehicle as it was being driven westerly toward Caldwell. The collision occurred in the westbound lane. The impact severed the cab of the pickup from its bed and the camper sitting on the bed, throwing the cab some 116 feet from the point of impact. The Olson vehicle left no skid marks approaching the point of impact, nor did the witnesses report hearing any screeching of tires indicating that Olson had slammed on the brakes prior to impact.
The drivers of the truck and the vehicle following the Dawson pickup testified that the Olson vehicle was traveling at a speed of approximately 50 to 60 miles per hour immediately prior to impact. The posted speed limit at the overpass was 35 miles per hour, but the evidence indicated that a sign located approximately one quarter mile east of the overpass, facing the direction Olson was traveling, was posted at 50 miles per hour. Testimony also indicated that because Franklin Road arched over Interstate 80N at this interchange a person stopping at the stop sign or stop line had limited visibility of traffic approaching from the east because the driver could not see over the crest of Franklin Road, and that a driver turning left had to creep into the westbound lane in order to check for traffic approaching in that lane.
During trial the plaintiffs attempted to introduce the following evidence which was not admitted by the trial court: (1) a map of the interchange prepared by John L. Hoffman, a consulting engineer, which was prepared from official State Highway Department maps which were admitted into evidence, but which eliminated a great deal of the engineering detail found in those maps; (2) a chart of automobile stopping distances for various speeds taken from the Idaho Driver’s Handbook; and (3) the testimony of witness Lawrence Reece that at a distance of approximately a mile and one half from the point of the collision he had been passed by the Olson vehicle and that the Olson vehicle was then traveling at approximately 90 miles per hour. This evidence was admitted by the trial court in the first trial, but excluded in the second trial.
Also, after the case was submitted to the jury and they had deliberated for two hours, the jury returned to court and the foreman asked the trial judge for further explanation of the meaning of “proximate” as given in the instructions to the jury using the phrase “proximate cause.” The trial judge refused, telling them to reread the instruction number 4 because “that is the definition of it.” (Rptr.Tr., p. 214).
The appellants assign as error the failure to admit into evidence the three items of evidence above discussed, the failure of the trial court to further instruct the jury on the meaning of proximate cause, and the failure of the trial court to grant the plaintiffs’ motion for new trial. We hold that the trial court erred in excluding these items of evidence and in failing to further instruct the jury, and that the cumulative effect of these errors warrants a reversal of the trial court judgment and a remand of this case for a new trial.
I
The refusal of the trial court to admit the testimony of Lawrence Reece that, in his opinion, the Olson vehicle was traveling at a rate of 90 miles per hour a mile and a half from the point of collision was error. In sustaining the defendant’s objection to Reece’s testimony, the court stated it was so holding on the ground that the occurrence was too remote. In support of that ruling respondent argues that the record also reveals that Reece was incompetent to testify because he had an inadequate opportunity to observe the Olson vehicle as it passed him. Since we determine [278]*278here that the testimony was not remote as a matter of law, and that Reece was competent to give his opinion, we reject both grounds for excluding the testimony.
In Koch v. Elkins,
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BAKES, Justice.
This is a wrongful death action arising out of a traffic accident in which Nathaniel and Hazel Dawson, husband and wife, were killed when the pickup truck driven by Hazel Dawson was struck by an automobile driven by the defendant Ronald T. Olson, an uninsured motorist. The accident occurred on January 12, 1968. On September 17, 1968, the plaintiffs, the children of Nathaniel Dawson, brought a wrongful death action against Olson. The Dawsons’ automobile insurer, State Farm Mutual Automobile Insurance Company, petitioned to intervene on the ground that because the Dawson’s policy contained an uninsured motorist provision, the insurance company had a vital interest in the outcome of this case. The petition to intervene was granted. The case was tried beginning October 5, 1970, and the jury returned a verdict for the plaintiffs for $75,000. Olson and State Farm both moved for a judgment notwithstanding the verdict or a new trial. On November 27, 1970, the trial court entered judgment notwithstanding the verdict for both the defendant and the intervenor. From this en- ■ try of judgment the plaintiffs appealed.
In Dawson v. Olson, 94 Idaho 636, 496 P.2d 97 (1972), we held that the judgment notwithstanding the verdict had been erroneously granted because there was sufficient substantial evidence to support the verdict, and remanded the case for further proceedings. Upon remand the trial judge granted the defendant- and intervenor-respondents’ motion for new trial. The plaintiffs appealed from that order and, in Dawson v. Olson, 95 Idaho 295 507 P.2d 804 (1973), we affirmed the order granting a new trial. That trial was held on December 10 and 11, 1973, and resulted in a- jury verdict for the defendant. Judgment was entered for the defendant. The plaintiffs moved for a new trial and the motion was denied. The plaintiffs have taken this appeal from the judgment and the denial of their motion for new trial.
The uncontradicted testimony given at the second trial disclosed the following sequence of events preceding the accident. The Dawson pickup was the second in a line of three vehicles that were exiting from Interstate 80N onto Franklin Road, Highway 20-26, at the interchange between the two highways near the eastern city limits of the city of Caldwell. Charles Ragsdale was driving the first vehicle in the line, a semi-truck trailer, which was pulling two 26-foot trailers and which had an overall length of approximately 64 feet. At the top of the exit ramp, where the ramp intersected Franklin Road which passes over Interstate 80N, there was a stop sign, a stop line and a flashing red light. Ragsdale brought his truck to a complete stop at the top of the ramp, then turned left to proceed easterly along Franklin Road away from the city of Caldwell. John H. Montgomery, the driver in the third vehicle in the line on the exit ramp, testified that as the truck moved away from the stop sign the Dawson pick[277]*277up did not drive up to and stop at the stop line or stop sign at the top of the exit ramp; rather, it followed along closely behind Ragsdale’s truck as that truck made a left hand turn onto Franklin Road, never stopping before it entered the intersection. The Dawson vehicle, which was turniiig left to proceed easterly along Franklin Road, was struck by the Olson vehicle as it was being driven westerly toward Caldwell. The collision occurred in the westbound lane. The impact severed the cab of the pickup from its bed and the camper sitting on the bed, throwing the cab some 116 feet from the point of impact. The Olson vehicle left no skid marks approaching the point of impact, nor did the witnesses report hearing any screeching of tires indicating that Olson had slammed on the brakes prior to impact.
The drivers of the truck and the vehicle following the Dawson pickup testified that the Olson vehicle was traveling at a speed of approximately 50 to 60 miles per hour immediately prior to impact. The posted speed limit at the overpass was 35 miles per hour, but the evidence indicated that a sign located approximately one quarter mile east of the overpass, facing the direction Olson was traveling, was posted at 50 miles per hour. Testimony also indicated that because Franklin Road arched over Interstate 80N at this interchange a person stopping at the stop sign or stop line had limited visibility of traffic approaching from the east because the driver could not see over the crest of Franklin Road, and that a driver turning left had to creep into the westbound lane in order to check for traffic approaching in that lane.
During trial the plaintiffs attempted to introduce the following evidence which was not admitted by the trial court: (1) a map of the interchange prepared by John L. Hoffman, a consulting engineer, which was prepared from official State Highway Department maps which were admitted into evidence, but which eliminated a great deal of the engineering detail found in those maps; (2) a chart of automobile stopping distances for various speeds taken from the Idaho Driver’s Handbook; and (3) the testimony of witness Lawrence Reece that at a distance of approximately a mile and one half from the point of the collision he had been passed by the Olson vehicle and that the Olson vehicle was then traveling at approximately 90 miles per hour. This evidence was admitted by the trial court in the first trial, but excluded in the second trial.
Also, after the case was submitted to the jury and they had deliberated for two hours, the jury returned to court and the foreman asked the trial judge for further explanation of the meaning of “proximate” as given in the instructions to the jury using the phrase “proximate cause.” The trial judge refused, telling them to reread the instruction number 4 because “that is the definition of it.” (Rptr.Tr., p. 214).
The appellants assign as error the failure to admit into evidence the three items of evidence above discussed, the failure of the trial court to further instruct the jury on the meaning of proximate cause, and the failure of the trial court to grant the plaintiffs’ motion for new trial. We hold that the trial court erred in excluding these items of evidence and in failing to further instruct the jury, and that the cumulative effect of these errors warrants a reversal of the trial court judgment and a remand of this case for a new trial.
I
The refusal of the trial court to admit the testimony of Lawrence Reece that, in his opinion, the Olson vehicle was traveling at a rate of 90 miles per hour a mile and a half from the point of collision was error. In sustaining the defendant’s objection to Reece’s testimony, the court stated it was so holding on the ground that the occurrence was too remote. In support of that ruling respondent argues that the record also reveals that Reece was incompetent to testify because he had an inadequate opportunity to observe the Olson vehicle as it passed him. Since we determine [278]*278here that the testimony was not remote as a matter of law, and that Reece was competent to give his opinion, we reject both grounds for excluding the testimony.
In Koch v. Elkins, 71 Idaho 50, 225 P.2d 457 (1950), a case in which the question of whether the driver of a vehicle involved in a one-car accident was negligent was at issue, the trial court allowed into evidence the defendant’s plea of guilty to a charge of reckless driving occurring three quarters of a mile away and less than two minutes before the time of the accident. In that case we said:
“Even if it be assumed that the guilty plea constituted an admission by the defendant as to the manner of his driving only at the time he passed the truck, and not at the time the car left the highway, it would still be admissible. Elkins, himself, testified that he was traveling about 25 miles per hour just before the accident. At that rate he would travel the three-fourths mile in less than two minutes. This would not be too remote to have some weight as an admission as to the manner of driving at the time of the accident.” 71 Idaho at 54, 225 P.2d at 460. (Emphasis added).
In the case at bar, Reece was prepared to testify that the Olson vehicle had passed him, traveling at a rate of approximately 90 miles per hour, at a point about a mile and a half from the scene of the accident. A vehicle traveling between 60 and 90 miles per hour will traverse a mile and one half in from 60 to 90 seconds. Under the Koch holding, this could not be considered too remote to have some weight as evidence of Olson’s speed at the overpass.
Further, in a case which involved the same issue as to the admissibility of an opinion of the speed of the vehicle in question shortly before the collision, the Supreme Court of Pennsylvania stated:
“Remoteness of the evidence is not determinable by distance and time alone, but . . . depends upon the facts in each case. No exact limitation of distance or time can be fixed. Where the accident occurs in a city, for instance, with intersecting streets and traffic, evidence of a speed at a comparatively short distance before the accident may be too remote, whereas in rural areas evidence of speed at a greater distance may be relevant.” Finnerty v. Darby, 391 Pa. 300, 138 A.2d 117, at 125 (1958).
The stretch of highway from the point where the Olson vehicle passed Reece to the freeway overpass was straight and dry. We hold that the speed of that vehicle at the point at which Reece observed it is not too remote, but is admissible, “its weight and credibility being for the jury.” Finnerty v. Darby, supra, 138 A.2d at 124.
Respondent claims as an additional ground for excluding the testimony that Reece was incompetent to state his opinion as to the speed of the Olson vehicle because Reece’s attention had been diverted by some activity in a field to his right as the Olson vehicle passed him. This diversion, it is claimed, resulted in an insufficient observation of the Olson vehicle to form an opinion as to speed. While evidence of such diversion may have afforded the defendant an opportunity to attack the weight of Reece’s testimony, it did not constitute grounds for excluding the opinion altogether, in light of the foundation laid by the plaintiffs as to Reece’s competency.
Reece’s foundation testimony established that he had been aware of the car approaching from the rear, that he observed it through his rear view mirror and as it passed him, and that he had flashed his lights at the driver of the car to indicate that it was safe to return to the right hand lane. He stated that he had been driving for about twenty five years and had formerly been a race car driver. Prior to asking for the opinion objected to, counsel asked Reece whether he had formulated an opinion as to the speed of the vehicle and on what he would base his opinion. Reece stated that he did have an opinion and then responded:
“A. Well, partly on the way that the car drove up behind me, and the time [279]*279that he took to pull back from the left lane into the right lane.
“By the time he went clear around me I was almost to Lakey’s, and, and by the time he pulled back into the lane he was almost up to Bob Nichols sign which is several hundred feet from the service, or the area there where you pull into Lakey’s.
“Q. And you would base it in part on your own experience as a driver ?
“A. Right. I raced for several years, and I am quite aware of the speed that people are driving up behind me, and what they are driving around me at the time.” (Rptr. Tr., pp. 90-91).
Since a proper foundation for the opinion was laid, and that opinion evidence was relevant and tended to support plaintiffs’ theory of the case, it was error to exclude that testimony.
Respondent claims that even if the exclusion of the testimony was error it was not prejudicial because it was merely cumulative of other evidence of speed which was admitted at trial. County of Bonner v. Dyer, 92 Idaho 699, 448 P.2d 986 (1968). However, we do not think that Reece’s testimony was cumulative. Two witnesses who were at the overpass at the time of the collision stated that they thought the Olson vehicle was traveling from 50 to 60 miles per hour. However, both witnesses qualified their opinions by stating that they could only observe the car approaching from the crest of the overpass. The three opinions, taken together, tended to prove plaintiffs’ theory that the Olson vehicle was traveling at an excessive speed at the time of the collision and even had the Dawson vehicle stopped it could not have seen the rapidly approaching Olson vehicle because of the curvature of the overpass, or even if visible, the driver of the Dawson vehicle might have reasonably concluded that she had adequate time to execute the turn onto Franklin Blvd., and thus it was the Olson vehicle’s excessive speed and not Dawson’s failure to stop which was the proximate cause of the collision.
There is a further indication that the exclusion of Reece’s testimony was prejudicial. At the first trial of this case, when the trial court admitted Reece’s opinion over objection that it was too remote, the jury found for the plaintiffs, the necessary implication being that they had determined that it was the defendant’s negligence which proximately caused the accident. In the second trial, upon the exclusion of that same evidence, the jury found for the defendant. We conclude that the excluded evidence was material and that its exclusion was prejudicial.
II
Appellants next claim that the district court erred in refusing to admit into evidence plaintiffs’ exhibit 1, the enlarged and simplified map of the interchange prepared by John L. Ho'ffman, a consulting engineer, from official Idaho Department of Highway maps. The simplified map was admitted without objection at the first trial of this action. In the second trial, plaintiffs offered the map, exhibit 1, three times and each time it was excluded from evidence. It was first offered at the beginning of the trial during plaintiffs’ direct examination of Hoffman. Counsel for defendant objected to its admission on the ground that the map was hearsay since the expert had no first hand knowledge of the accuracy of the official maps from which he obtained his information, and at this time the official maps were not in evidence. Plaintiffs did not indicate at this time whether they intended to use the map, exhibit 1, as substantive evidence or for illustrative purposes only. The objection was sustained. Later in the trial, a district engineer for the Idaho Department of Highways testified that the proffered map, exhibit 1, was an accurate representation of the official plans of the overpass as constructed. Based on this foundation testimony, plaintiffs again offered into evidence the simplified map, exhibit 1, again without indicating the purpose for which it was offered. The court ruled that since the official maps were available, they [280]*280should be admitted instead. Finally, the map, exhibit 1, was again introduced at the close of plaintiffs’ case and after all plaintiffs’ witnesses had testified. Only then did plaintiffs specifically state that the map, exhibit 1, was offered for illustrative purposes. Defendant’s objection, again on hearsay grounds, was again sustained.
The simplified map should have been admitted, at least to illustrate the testimony of witnesses under the rule set forth in McKee v. Chase, 73 Idaho 491, 253 P.2d 787 (1953):
“Photographs, maps, and other drawings, are recognized as proper evidence to supplement the testimony of witnesses where the subject matter of the testimony is difficult to portray without such aids, or where the jury can be given a better understanding of the physical facts with which they are concerned. Their admission is proper to illustrate the testimony. They are also regarded as a proper means of expressing the witness’ testimony. That is, a witness may be unable, by means of words or gestures alone, to convey to the jury an accurate understanding or picture of the relative position of the physical objects or their physical characteristics, without the assistance of photographs or drawings. So, he may make a drawing or a photograph, or identify and adopt such drawing or photograph, made by another, as a means of portraying to the jury facts which are within his knowledge, and which he is not as well able to portray without such help.” 73 Idaho at 501-502, 253 P.2d at 792-793.
The expert Hoffman had also prepared scale models of the Dawson pickup, Rags-dale’s semi-truck and the Olson automobile, which exhibits were admitted into evidence without objection. Plaintiffs obviously intended that witnesses would use these models and the simplified map to illustrate their descriptions of relative positions and movements of the vehicles. Without the map, the models of the vehicles were of no help to the witnesses. Since it was apparent that the map was being introduced for illustrative purposes at least, it was error for the trial court to refuse to admit the simplified map for that limited purpose.
On retrial if the map, exhibit 1, is also offered as substantive evidence, e. g., to prove the facts and details shown therein, then it is hearsay evidence and is only admissible if the requirements of the hearsay rule are met. Hook v. Horner, 95 Idaho 657, 517 P.2d 554 (1973). The Department of Highway maps are admissible as official public documents under I.C. §§ 9-311(3), 9-315. These maps contain considerable engineering minutiae, e. g., details of curve construction such as points of tangency and the like, which give the jury no information relevant or necessary to decide the case, but which might confuse the jury because of the intricate detail. Where it is shown that the simplified version of the map was prepared by a qualified person, and where the original official maps have themselves been introduced into evidence, we see no reason, under the best evidence or the hearsay rules, why the simplified version may not be used to prove the details shown therein. The trustworthiness of the simplified map is ensured by the right of the opposing party to examine it and compare it with the original, and to cross examine the expert who prepared it. The utility of a simplified version of a detailed and complex map or other diagram is analogous to the statutory exception to the best evidence rule formulated in I.C. § 9-411(5) 1 which permits the introduction of summaries of voluminous accounts or documents as a practical, time saving device in appropriate situations. See also Wigmore on Evidence, § 1230 [281]*281(Chadbourn Rev., 1972); 29 Am.Jur.2d, Evidence, § 458.
Ill
Appellants claim that the chart prepared from the Idaho Driver’s Handbook showing average stopping distances should have been admitted into evidence. We agree. This chart may be admitted if it is relevant and material. Bell v. Joint School Dist. No. 241, 94 Idaho 837, 499 P.2d 323 (1972); Dewey v. Keller, 86 Idaho 506, 388 P.2d 988 (1964). In this case a question which the jury must necessarily consider in deciding if Olson’s negligence was a cause of the collision was whether, if Olson had been driving his car at a lawful rate of speed and had been attentive as a reasonable and prudent driver to the conditions in the roadway ahead of him, could he by exercising the skills of a reasonable and prudent driver have stopped before colliding with the Dawson vehicle or otherwise avoided the accident by taking appropriate action at that point when he should first have become aware that the Dawson vehicle presented a road hazard ahead. The stopping chart is certainly relevant and material in deciding that question and should have been admitted. It would not be for the purpose of estimating the speed of the approaching vehicle, as in Dewey, supra, - when there was insufficient evidence introduced at trial to allow such an estimation to be made. The chart would here constitute a valuable tool in helping the jury estimate the ability of a reasonable driver traveling at a lawful rate of speed over an arched roadway to avoid a collision with an object first appearing before him as he travels over the crest of the overpass.
IV
In their next assignment of error, appellants claim that the district court should have further instructed the jury on the definition of “proximate” when requested to do so by the jury. The court gave the following instruction defining proximate cause:
“INSTRUCTION NO. 4
“The proximate cause of an injury is that cause which, in natural and continuous sequence, unbroken by any efficient intervening cause, produces the injury, and without which the result would not have occurred. It is the efficient cause —the one that necessarily sets in operation the factors that accomplish the injury.” Rept. Tr., Vol. 3, p. 5.
Taken alone, this instruction is misleading. From the evidence introduced at trial the jurors could have concluded that the injury was caused by (1) both the negligence of respondent Olson and Hazel Dawson, (2) by the negligence of either Olson or Hazel Dawson alone, or (3) that it was not caused by the negligence of either party. But instruction number 4 could easily be interpreted to mean that there can be only one proximate cause of an injury. This is incorrect. Although this Court said in Stearns v. Graves, 62 Idaho 312, 111 P.2d 882 (1941), that there could be only one proximate cause of an injury, it rejected the one cause rule in Pigg v. Brockman, 85 Idaho 492, 381 P.2d 286 (1963). In Pigg we found an instruction substantially like instruction number 4 to be erroneous because it might mislead the jury into thinking that only one act of negligence could be the cause of an injury.
In its instruction number 34, however,, the court outlined the issues to be resolved by the jury, setting forth questions as to whether Olson was negligent and if so whether his negligence was a proximate cause of the injury, and also whether Hazel Dawson was negligent and if so whether her negligence contributed as a proximate cause of the injury.2 This instruc[282]*282tion suggests that there can be more than one cause of an injury and correctly reflects the rule of Pigg v. Brockman, supra. In the absence of any indication that the jury was confused by the interaction of instruction number 4 and instruction number 34, we would be inclined to hold that the instructions, taken as a whole, were not misleading or erroneous. Werry v. Phillips Petroleum Co., 97 Idaho 130, 540 P.2d 792 (1975). Cf. Shields v. Morton Chemical Company, 95 Idaho 674, 518 P.2d 857 (1974). However, the jury asked the court for further amplification of the definition of “proximate cause” and the trial court refused it, telling them to reread instruction number 4 because “that is the definition of it.” This abrogated any curing effect of instruction number 34 and refocused the jury’s attention on instruction number 4. Thus, under the circumstances of this case we cannot say that instruction number 34 cured instruction number 4.
As a general rule the decision to further instruct a jury on a matter is within the trial court’s discretion. State v. Chang, 50 Haw. 195, 436 P.2d 3 (1967); Whisnant v. Holland, 206 Or. 392, 292 P.2d 1087 (1956); Muskin v. Gerun, 46 Cal. App.2d 404, 116 P.2d 105 (1941). However, the rule as stated in each of the above cited cases is premised on the fact that the instructions as given were clear, direct and proper statements of the law. In this case, instruction number 4 was a confusing and unnecessarily technical statement of the law and was susceptible to an erroneous interpretation.3
In Worthington v. Oberhuber, 419 Pa. 561, 215 A.2d 621 (1966), a case in which the jury deliberated for three hours, then asked for further instructions on negligence and the duty of drivers at intersections, but were not given the requested instructions, the Supreme Court of Pennsylvania stated:
“There may be situations in which a trial judge may decline to answer questions put by the jury, but where a jury returns on its own motion indicating confusion, the court has the duty to give such additional instructions on the law as the court may think necessary to clarify the jury’s doubt or confusion.” 215 A.2d at 621 (Emphasis added).
We believe that the trial court did have a duty in this case to clarify its definition of proximate cause when the jury returned to court indicating its confusion.
V
In light of the trial court’s error in refusing to admit the testimony of the wit[283]*283ness Reece, the simplified map of the interchange, and the stopping chart from the Idaho Driver’s Handbook, and in failing to further instruct the jury on the meaning of proximate cause, we are constrained to hold that the plaintiff appellants were denied a fair trial on the merits of their claim. The rule is well stated in Ivie v. Richardson, 9 Utah 2d 5, 336 P.2d 781, 787 (1959):
“It is unnecessary and would serve no useful purpose for us to decide whether any one of the errors above discussed, considered separately, would constitute sufficient prejudicial error to require a new trial. The question is whether the case was presented to the jury in such a manner that it is reasonable to believe there was a fair and impartial analysis of the evidence and a just verdict. If errors were committed which prevented this being done, then a new trial should be granted, whether it resulted from one error, or from several errors cumulatively. We expressly do not mean to say that trivia which would be innocuous in themselves can be added together to make sufficient error to result in prejudice and reversal. The errors must be real and substantial and such as may resonably be supposed would affect the result. However, errors of the latter character, which may not by themselves justify a reversal, may well, when considered together with others, render it clear that a fair trial was not had. In such event justice can only be served by the granting of a new trial, absent the errors complained of.”
For all of the foregoing reasons we feel that sufficient error was committed in the second trial of the above matter the cumulative effect of which denied the appellants a fair trial. Therefore, the cause is reversed and remanded for a new trial.
Appellants assert one additional assignment of error, i. e., the failure of the trial court to grant their motion for new trial which was based upon several alleged prejudicial rulings of the trial court. We do not reach this question in view of our disposition of this case and the provisions of I.R.C.P. 40(d)(1).
Reversed and remanded for new trial. Costs to appellants.
McQUADE, C. J., and DONALDSON and SHEPARD, JJ., concur.