82 N.W.2d 82 (1957) Freddie JESSE, Appellee, v. WEMER and WEMER COMPANY and Adam Walters, Appellants. No. 49091. Supreme Court of Iowa. April 3, 1957. Rehearing Denied June 3, 1957. Gilmore, Dull & Keith, Ottumwa, and Baumert & Gerard, Sigourney, for appellants. Moon, Barnes & Schlegel, Ottumwa, and Kepford, Balch & Kepford, Waterloo, for appellee. LARSON, Justice. Plaintiff's action for damages resulted from an accident on Highway 63 about three miles north of Ottumwa, Iowa, May 22, 1951, about 6 or 6:30 P.M. Southbound plaintiff had brought his empty semitrailer truck to a stop from 40 to 75 feet north of a railroad underpass after he received a signal from the operator of a northbound semitrailer nearing the underpass indicating that he was coming through. Plaintiff, traveling about 50 miles per hour, had passed defendants' vehicle, a dual-wheeled loaded stock truck, about a mile north of the underpass, and had returned to his west lane prior to the yellow nonpassing warning line on the pavement. Plaintiff testified he first pulled away from defendants' rig, but after proceeding some 500 or 600 feet started to slow down, flash the rear running lights on his truck, and apply his brakes which activated his rear stop light. Defendant Walters said he saw the flashing lights when he was still some 150 feet behind plaintiff's truck and applied his brakes, but for some reason was unable to stop in time to avoid running into the rear of plaintiff's vehicle which had then come to a complete stop. From the record we learn that the pavement was 20 feet wide with a 6 or 8 inch berm, and although the pavement did not narrow under the pass, the pilings were very close to the edge of the pavement, and this gave the appearance of a narrow defile in the highway, as disclosed by the photo exhibits introduced. Without reference to statutory obligations, the trial court gave instructions on due care, negligence, contributory negligence, etc. and refused defendants' proposed instructions relating, among other things, to statutory violation and legal excuse. *83 The jury found for the plaintiff and fixed his damages at $12,366.29. Defendants' motion for judgment notwithstanding the verdict and motion for a new trial were overruled and judgment entered for the jury-determined amount. Defendants assign nineteen errors, which may be considered under four propositions, i. e. Was plaintiff guilty of contributory negligence as a matter of law? Should the trial court have submitted for jury consideration certain issues as to plaintiff's negligence and given requested instructions thereon? Did the court err in admitting certain evidence as to custom and as to competent medical testimony? Was the jury verdict excessive? Further reference to the evidence appears in the opinion and of course under the rule will be considered in the light most favorable to the plaintiff. Defendants' motion for a directed verdict made at the close of plaintiff's case, renewed at the close of all testimony, based upon grounds that plaintiff had failed to prove his freedom from contributory negligence which contributed to his injury and damage, was properly denied. Their principal contentions are that plaintiff violated the obligations of a statute, section 321.354, without explanation or excuse, that he failed to keep a proper lookout, and that he failed to prove he had given the statutory warning required of one who stops upon the highway, all of which contributed directly to his injury and damage. Defendants urge, with vigor, that both the statutes pertaining to stopping and parking on the highway and pertaining to adequate warning devices, were statutory pronouncements of the requirements of due care, and that the unexcused violation here of those provisions was negligence per se, citing cases such as Kisling v. Thierman, 214 Iowa 911, 243 N.W. 552; Marts v. John, 240 Iowa 180, 35 N.W.2d 844, and others. They refer to our statement in Florke v. Peterson, 245 Iowa 1031, at page 1034, 65 N.W.2d 372, at page 373, where we said: We have consistently held that violation, without legal excuse, of a statute which prescribes the care required under given conditions constitutes negligence per se", citing cases. Defendants alternately argue that if we consider the violations here no more than prima facie negligence, the question as to whether or not plaintiff's acts were justified and were not contributory negligence should have been submitted to the jury under proper instructions as to statutory requirements and adequate excuse for failure to comply. They cite such cases as Clark v. Umbarger, Iowa 1956, 75 N.W.2d 243; Smith v. Pust, 232 Iowa 1194, 6 N.W.2d 315; Reed v. Willison, 245 Iowa 1066, 65 N.W.2d 440; Ellis v. Robb, 242 Iowa 875, 47 N.W.2d 246; Tuhn v. Clark, 241 Iowa 441, 41 N.W.2d 13, 515 A.L.R. 2d 903; and others. With the principles and enunciations set forth in these cases there can be no question here in Iowa. They are sound and correct. However, the trial court did not feel them applicable to the facts of this case, and we agree. I. Primarily, then, the first proposition to consider is whether or not there was substantial evidence of a violation of a statutory obligation either as to stopping on the traveled portion of the highway or in failing to give a signal warning required by the statutes. The trial court clearly concluded no such evidence appeared and gave instructions relating only to common law requirements of due care. The problem thus requires consideration of the statutes involved. Section 321.354, Code of Iowa 1954, I.C. A., in effect when this matter arose, provides in part: "* * * no person shall stop, park, or leave standing any vehicle * * * upon the paved * * * part of the highway when it is practical to stop, park, or so leave such vehicle off such part of said highway * * *." *84 Primarily, this is a parking restriction statute. Its predecessor, section 5054, Code of 1924, used this language: "No person shall, during any period of time * * * permit a motor vehicle, under his control, to stand upon the paved portion of any hard surfaced highway outside of the corporate limits * * *." (Emphasis supplied.) Clearly the word "stop" used in the statute is intended as synonymous with "park" or "leave standing". They must be read together. "Park" means to halt and to leave standing, or to stop and remain standing. See Webster's New International Dictionary, 1928 edition. It is inconceivable that every stopping, regardless of the emergency or cause, even of a momentary nature, was intended to be prohibited by this statute, and in this regard it must be considered ambiguous as to legislative intent. Such a change from the common law rules requiring due care under compelling circumstances such as we observe here, would not meet with reason or expediency. We have often said statutory construction that would lead to unreasonable, unjust, impracticable and absurd consequences, cannot be adopted. Worthington v. McDonald, 246 Iowa 466, 470, 68 N.W.2d 89, and citations; 50 Am.Jur., Statutes, §§ 226, 227; Annotation, 37 A.L.R. 944. Although not strictly a case in point, see discussion in Long v. Northrup, 225 Iowa 132, 279 N.W. 104, 116 A.L.R. 1475. There are far too many times when, due to road repair, narrow bridges, or other hazardous situations, due care demands that one stop his vehicle momentarily. To require the operator of such a vehicle to take to the shoulder or to explain under such circumstances why he did not go onto the shoulder of the highway to stop, under penalty of being charged with negligence, inferred or per se, would most certainly confuse rather than clarify the obligations of a motor vehicle operator on our highways, to say nothing of juries required to pass on legal excuses therefor. This court has said many times it is the obligation of one to stop when it becomes apparent to him another will not yield the right of way and a real or apparent hazard appears. We have said it would be negligence not to do so. See Jordan v. Schantz, 220 Iowa 1251, 1256, 264 N.W. 259. The trial court determined, under the circumstances disclosed by the evidence, the stop made by the plaintiff did not amount to parking or standing contemplated under this statute, so as to require special instruction thereon. We concur, but in doing so also warn that there may be many instances where the question of fact as to whether a "stop" amounted to a parking prohibited by the statute, should be left for the jury under proper instructions. Nevertheless we are satisfied that where one stops momentarily upon the paved portion of the highway to yield the traveled portion of the pavement at a narrow bridge, underpass, or other defile, or in kindred circumstances, such a momentary stop itself is not a violation of the provisions of due care set forth in section 321.354 of the Code, I.C.A., and that the court was correct in refusing instructions relating thereto in this case. Section 321.316, Code of 1954, I.C.A., in contemplation of required and necessary stops on the highway, sets out a requirement of notice to following vehicle operators. This stop seemed reasonably necessary. Plaintiff testified: "The underpass * * * looked narrow to me * * *. I believed that my truck and the one approaching me from the south could not safely pass through this underpass at the same time. * * * He (the operator of the approaching truck from the south) flashed his lights. * * * I * * * flashed my lights that I was unloaded and he could have it. * * * Immediately I started flickering my trailer lights and put my foot on the brake to come to a stop. I did not put my left arm out." Thereafter plaintiff said he brought his truck to a casual stop "like you normally would at a stop sign." It was a momentary stop to let the northbound vehicle come through the underpass, for as that truck came alongside, plaintiff said he was preparing *85 to move forward, but at that moment he was hit from the rear by defendants' loaded truck. Under these circumstances the issue for the jury to decide was whether as a prudent man the plaintiff's action in stopping to yield the underpass was in the exercise of due care rather than as an excuse for violating a statute, and we find no error in the court's instructions given in this regard. II. Defendants contend that the court's instructions as to the legal requirement to give a timely and adequate signal of his intention to stop were erroneous, and that plaintiff failed to prove he had given the signal required by Code, § 321.317, I.C.A. The trial court told the jury: "* * * it was his (plaintiff's) duty before suddenly decreasing the speed of, or stopping his truck, to give a timely and adequate signal of his intention to slow down or stop. No particular type or manner of signal was required of him, but he was required to give timely warning of his intention, and such warning as would be calculated to reasonably and timely warn other travelers upon the highway * * *." (Emphasis supplied.) Defendants contend, although this may be a proper instruction under the due care required by common law, the statutory requirements are specific and set forth obligations with which plaintiff has not shown compliance. Section 321.316, Code of Iowa 1950, I.C.A., then in effect provided: "No person shall stop or suddenly decrease the speed of a vehicle without first giving an appropriate signal in the manner provided herein to the driver of any vehicle immediately to the rear when there is opportunity to give such signal." Section 321.317 provided: "The signals herein required may be given either by means of the hand and arm or other proper signal or signal device of a type approved by the department, * * *." Section 321.318 designates the meaning of each arm signal required, when that method is used. No specific types of mechanical or electrical signals were here set forth, but defendants contend, because of the wording of section 321.317, it becomes incumbent upon the plaintiff to introduce proof that the type used by him was approved by the "department", which is defined as the motor vehicle department under the commissioner of public safety. Section 321.1(34), Code of 1950, I.C.A. Section 321.404, Code of 1950, I.C.A., enacted subsequent to section 321.317, gives some indication of proper equipment required by statute as follows: "Every motor vehicle shall be equipped with a signal lamp or signal device which is so constructed and located on the vehicle as to give a signal of intention to stop, which shall be red or yellow in color, which signal shall be plainly visible and understandable in normal sunlight and at night from a distance of one hundred feet to the rear but shall not project a glaring or dazzling light." It would not be an unfair assumption, considering these statutes both effective, that any signal device which conforms to the latter standard would have the approval of the department. It would appear that the trial court's instruction that "no particular type or manner of signal was required * * *" is too broad. However, as pointed out, the record discloses that defendant Walters saw and understood the warning signals given by plaintiff while some 150 feet away, and that plaintiff's stop light was on after the collision. The type of warning under these facts seems quite immaterial and clearly has no bearing on a proximate cause of the collision, injury or damage. Jirkovsky v. Elfman, 323 Ill.App. 282, 55 N.E.2d 288; Ryan v. Trenkle, 203 Iowa 443, 212 N.W. 888; Scoville v. Clear Lake Bakery, 213 Iowa 534, 239 N.W. 110. Furthermore, *86 plaintiff testified defendant operator said he pumped his brakes, but they would not hold. These being the facts, no causal connection would appear due to the failure of plaintiff to signal with an approved mechanical or electrical device, and that error, if it was error, in the instruction would not be prejudicial. Jirkovsky v. Elfman, supra; Ryan v. Trenkle, supra. In Scoville v. Clear Lake Bakery, supra, at page 539, 213 Iowa, at page 112 of 239 N. W., we said: "The only function to be served by lights, or by an attendant, would be to warn travelers of the presence of the obstruction in the road. Such ground of negligence could not be available to a plaintiff, who saw the truck for hundreds of feet in his approach thereto, and had no need of further warning." Also see Schroeder v. Kindschuh, 229 Iowa 590, 595, 294 N.W. 784; Harvey v. Knowles S. & M. Co., 215 Iowa 35, 41, 244 N.W. 660. III. As a further ground for their contention that the court should have directed a verdict for them, defendants claim plaintiff failed to show he maintained a proper lookout. A proper lookout is common law duty placed upon everyone operating a motor vehicle upon the highways of this state. This duty, under the best authorities and most sound reasoning, requires a lookout not only to the front and sides but also to the rear, with the question as to its being a proper or sufficient lookout determined by the particular surrounding circumstances as revealed by the evidence then under consideration. Clayton v. McIlrath, 241 Iowa 1162, 1170, 44 N.W.2d 741, 27 A.L.R. 2d 307; Brewer v. Johnson, Iowa, 72 N.W.2d 556. When the circumstances require, in the exercise of prudence and ordinary care, a lookout to the rear, proper lookout requires watchfulness and care for the safety of others. Ehrhardt v. Ruan Transport Corp., 245 Iowa 193, 61 N.W.2d 696; Becker v. City of Waterloo, 245 Iowa 666, 63 N.W.2d 919. Usually prudence and ordinary care require concentration ahead rather than behind. In the face of just such a circumstance as we have here, plaintiff's attention and obligation to see and meet the situation that was before him was of course paramount. Considering this problem in an early case of Strever v. Woodard, 160 Iowa 332, 337, 141 N.W. 931, 933, 46 L.R.A.,N.S., 644, we said: "Nor are we content with the suggestion of an obligation on the part of a traveler that he must, Janus-like, keep an outlook in the rear * * *." In Delfs v. Dunshee, 143 Iowa 381, 389, 122 N.W. 236, 240, we said under the circumstances there related: "* * * Nor was he bound to keep a lookout backwards. He had the right to rely upon those approaching from the rear to do so in the exercise of ordinary care." Lawson v. Fordyce, 234 Iowa 632, 12 N.W.2d 301. (Emphasis supplied.) Also see 1 Blashfield's Cyclopedia of Automobile Law and Practice, Permanent Edition, section 685, where the author says: "The duty of a driver to look ahead is paramount, though he must use reasonable care to ascertain whether cars are coming from behind if intending to change his course * * *." At pages 743 and 744, § 322, 60 C.J.S., Motor Vehicles, the general rule is said to be "* * * where vehicles are traveling in the same direction, the precise duties of the operator of the vehicle ahead depend on the circumstances. Some decisions hold that the leading vehicle has no absolute legal position superior to that of the one following, but that the operator must exercise ordinary care under the circumstances to prevent injury to vehicles that may be following, as by the use of necessary lights or warning signals on the rear of the vehicle to give notice to overtaking traffic. [Citing LeSage v. Smith, Tex.Civ. App., 145 S.W.2d 308; Valdin v. Holteen, 1953, 199 Or. 134, 260 P.2d 504.] Other decisions, *87 however, have broadly held that the vehicle ahead has the superior right, and that the driver thereof ordinarily owes no duty to the following car except to use the road in the usual way, in accordance with the laws of the road. It has been held that the driver in the lead need not as a rule keep a vigilant watch for drivers trailing him, although it has also been held that he cannot entirely ignore vehicles in the rear, and that he may be required to keep a lookout for vehicles to the rear where there appears some particular fact that calls his attention to the following vehicle and imposes some duty on the motorist to maintain such a lookout, or where he intends to execute some maneuver requiring a lookout for, and signal to, the following vehicle * * *." (Emphasis supplied.) (Citing LeSage v. Smith, supra.) In 5 Am.Jur. 656, section 280, there appears: "The driver of the front car owes no duty to the rear or trailing car except to use the road in the usual way, in keeping with the laws of the road, and until he has been made aware of it, by signal or otherwise, he has a right to assume either that there is no other automobile in close proximity to his rear or that, being there, it is under such control as not to interfere with his free use of the road in front of and to the side of him in any lawful manner." In referring to the term "lookout" in the recent case of Devore v. Schaffer, 245 Iowa 1017, 1024, 65 N.W.2d 553, 557, we said: Lookout is a "duty of keeping watch for possible danger. * * * As used in connection with the operation of a motor vehicle it has no technical legal significance. Its meaning depends on the context." As applied therein, it was held to mean care to discover whether plaintiff was in a place of safety from possible injury by the contemplated movement of the truck and trailer. We said in Ehrhardt v. Ruan Transport Corp., supra, 245 Iowa 193, 199, 61 N.W.2d 696, lookout by a motorist means more than looking straight ahead. Of course, maintenance of a proper lookout means doing something more than mere looking, i. e. the acts required by a diligent person exercising due care when the lookout discloses or reasonably should disclose to the driver circumstances fraught with danger. It does no good to look unless the action to avoid injury is reasonably prudent. For example, such acts require the giving of a proper signal to apprize the driver of the car in the rear of one's intentions in the operation of his vehicle. Under the circumstances related here no other act was required, and it would appear to call for mere speculation to submit to the jury the question of whether the plaintiff should have done something else to maintain a proper lookout. In the recent case of Clayton v. McIlrath, supra, 241 Iowa 1162, 44 N.W.2d 741, the plaintiffs' automobile was overtaking and passing defendant's car just as defendant turned out into the left lane of traffic, resulting in a collision. We said, 241 Iowa at page 1170, 44 N.W.2d at page 746: "* * * a motorist who is about to turn to his left to pass a preceding vehicle is required to exercise ordinary care under the circumstances to keep a lookout for other vehicles which may be in the act of passing him, or otherwise be endangered by such movement." In such a situation lookout would include a look to the rear before a change of direction is attempted, and if danger appears, the additional duty to delay the maneuver is manifest. Such additional duty may also apply when pulling back into one's righthand lane immediately after passing another vehicle. Section 321.299, Code of 1954, I.C.A. But the evidence here was undisputed that plaintiff had already passed defendant Walters and was well in front of him in the west or proper lane of traffic even prior to his slowing down for the stop. Obviously here no duty to delay this movement was violated. We are also certain plaintiff was not negligent in assuming that those behind him would observe the laws of the road, statutory or by common law custom, *88 and not follow so closely that they would be unable to stop, after due, timely and adequate warning. Menke v. Peterschmidt, 246 Iowa 722, 728, 69 N.W.2d 65, and cases cited. Assuming, then, such a stop on the highway ordinarily would require one to keep a lookout for vehicles to his rear, yet the evidence without dispute discloses plaintiff gave appropriate warning signals which were seen and understood by the operator of the following vehicle while still some 150 feet behind him. It was, as found by the jury, under proper instructions, a "proper and timely" warning on the part of the plaintiff, and that it was the defendant's failure to stop which was the proximate cause of the collision. We find, then, no other duty upon plaintiff, the violation of which contributed to the injury. We conclude that the duty of lookout to the rear does not require constant attention at all times, but only sufficient observation to establish an awareness of the presence of others at a time when a maneuver is contemplated which may endanger the following vehicle. This duty includes the giving of an appropriate, adequate and timely warning to the persons in the rear. As stated, the undisputed evidence discloses plaintiff was aware of defendant's presence and gave the warning which, under the issues submitted to it by the court, the jury found was adequate and timely. Proper lookout to the rear required no more under the circumstances, and there was no error in failure to instruct thereon. True, there was a shoulder on the approach to the underpass, but at or near the place of stopping, as disclosed by the picture exhibits, it was sloping, rough and funnel-shaped up to the pass itself. Negligence could scarcely be predicated upon the failure of plaintiff to take to the shoulder here, as a violation of the duty to keep a lookout to the rear. No authority has been cited to require such acts, in addition to an adequate warning, to comply with the obligation to maintain a lookout to the rear, and we think there are none. It is clear any lookout plaintiff failed to maintain, therefore, did not contribute directly to the collision, and the court's failure to instruct on lookout to the rear, even if proper, was not prejudicial error. Brewer v. Johnson, supra, Iowa, 72 N.W.2d 556. IV. Defendants' counterclaim alleges that plaintiff abruptly and negligently brought his truck to a stop without giving adequate warning or signal of his intention to do so. While the reference to an emergency was made and defendants contend the evidence of such is only proper to excuse an act of negligence on the part of plaintiff, we find in that evidence, which the court properly explained to the jury, only testimony which justified the judgment of plaintiff in not proceeding into a dangerous or apparent dangerous situation, rather than an excuse for a negligent act. It was rather justification for his acts to avoid negligence by proceeding. In this connection defendants complain of testimony admitted as to a custom of truckers to give certain signals when such a narrow impass is approached by meeting vehicles. The trial court told the jury: "* * * this line of testimony * * * is being admitted and may be considered by you and given such weight as you deem it entitled to have, as bearing upon the state of mind * * * of the plaintiff, just prior to his stopping and his reason for stopping, as bearing upon the question of his contributory negligence, if any, in stopping the truck at the time and place in question. This evidence may be considered by you for that purpose only. * * *" The statement was correct. The signals given and received were properly received as the basis of plaintiff's understanding of the danger then and there existing. This evidence did no more than justify his decision as a reasonable prudent person under the circumstances, as they were observed and reasonably understood by him. By knowledge of the custom he understood the signal meant the other truck was coming *89 on through the pass, and he could yield or try the defile at the same time. He had a right to his one half the traveled portion of the highway under the pass, but the modern "boot hill" is filled with those who made similar tries, upon whose headstones could be written: "Here lies the body of John O'Day He died maintaining his right of way, He was right, dead right, so he drove along, But he's just as dead as though he'd been wrong." The jury felt his discretion proper, and so do we. Langner v. Caviness, 238 Iowa 774, 778, 28 N.W.2d 421, 423, 172 A.L.R. 1135, and authorities cited therein. We held there that subject to certain qualifications upon the issues of negligence and contributory negligence, evidence of custom in the performance of similar acts, while not conclusive, it is generally admissible. We said: "Conformity with custom is some proof of due care and nonconformity some proof of negligence", citing cases. Also see 38 Am.Jur., Negligence, section 267; 25 C.J.S., Customs and Usages, § 32. V. We come now to the contention by defendants that testimony of Doctors Diamond and Fox was erroneously admitted, over proper and timely objections. The testimony of Dr. Diamond was by deposition. He testified he was the attending physician, and relied in part upon the history the plaintiff gave him. He first saw plaintiff on May 1, 1953, almost two years after the accident. He next saw the patient on May 18, 1953, and had not seen him since. Under his prescription plaintiff took about ten physiotherapy treatments, administered by the registered therapist in Dr. Diamond's office. The doctor's findings were that plaintiff had a chronic back sprain and he also prescribed a corset or back brace, which the plaintiff purchased and wore. Dr. Diamond said plaintiff suffered partial permanent disability of about ten per cent. It was his opinion that the injury produced a condition of the lumbar spine which was permanent in nature. His charges were $47.00. It appeared this action had already been commenced at the time this professional service was rendered, although both the plaintiff and the doctor denied the purpose of the consultation was to produce testimony in the case or that the doctor knew of the pending action when his services were first obtained. There was no testimony to the contrary. Defendants contend the evidence was not clear that Dr. Diamond was "a good faith treating physician" so as to justify his testimony. They contend the question as to whether or not he was a treating physician should have been submitted to the jury. We do not agree, for such objection is addressed to the competency of the testimony as well as the doctor, and was for the court to decide. There was no error in that determination, for the mere fact that an action had been commenced would not disqualify any physician who substantial evidence discloses was retained to actually diagnose, treat and prescribe for the litigant. The hearsay and self-serving restriction, we think, should extend no further than to objectionable testimony of one retained solely for the purpose of testifying in the case as an expert witness. Dr. Fox admittedly was called as a medical expert and had examined plaintiff with the purpose of offering testimony in this trial. Immediately after qualification, defendants' counsel examined him as to the source of the knowledge from which he expected to testify and objected to admission of his testimony as being based upon hearsay and self-serving information. Both parties cite and rely upon our recent pronouncements in Devore v. Schaffer, 245 Iowa 1017, 65 N.W.2d 553. We held therein a medical expert who had examined a plaintiff for the sole purpose of qualifying as an expert witness must base his testimony solely on the examination, and statements made to him by the patient as to the accident and the resulting injuries received cannot be related to the jury or form part of the basis of the expert's opinion. Devore *90 v. Schaffer, supra, and cases cited therein. This court there divided as to the acceptance of any expert opinion based upon the "clinical history", even though the history was not admitted as substantive proof. In the case at bar Dr. Fox was asked to base his opinion of the plaintiff's physical condition solely upon his physical examination of the plaintiff, and the answer was limited by the doctor himself to plaintiff's present condition. Defendants contend, having received a "case history" from the patient, an examining physician cannot give an opinion as to disability based solely on his own examination. We cannot say as a matter of law that is so, and believe it better to let the jury pass on the truth of that contention. The jury is best able to give his testimony the weight they feel it deserves. Dr. Fox's opinion as to the plaintiff's present condition was based on the patient's reactions to manual manipulations and tests he conducted. Of course this involved statements of plaintiff as to pain, etc., for as the doctor said, pain cannot be seen. Dr. Fox stated: "Without the use of a history, without the use of an X-ray examination, I can arrive at a conclusion that the patient has a certain disability. I cannot arrive at a conclusion of permanency without the other aids. * * * As a result of the physical examination I would estimate that that man was not capable of doing heavy activity." Dr. Fox did not give any opinion on the percentage involved. As to the settled law on the admissibility of expert medical testimony based upon case history, we can add little to our holdings in Devore v. Schaffer, supra; Mitchell v. Montgomery Ward & Co., 226 Iowa 956, 285 N.W. 187; Pierce v. Heusinkveld, 234 Iowa 1348, 14 N.W.2d 275; Little v. Maxwell, 183 Iowa 164, 166 N.W. 760. In 20 Am.Jur., Evidence, section 866, it is stated: "The general rule is that the opinion of a physician * * * as to the condition of an injured or diseased person, based wholly or in part on the history of the case as related to the physician * * * in the course of an examination of the former made out of court for the purpose of qualifying the physician * * * to testify as a medical expert, is not admissible, even though the injured person testifies that the statements he made to the physician are true." (Emphasis supplied.) In 32 C.J.S., Evidence, § 536, good authority is cited that a medical expert who has examined the patient for the purpose of becoming a witness "must base his testimony solely on the examination * * * and not on statements in the nature of self-serving declarations made by the patient * * * and acts * * * which may have been either voluntary or involuntary, cannot form part of the basis of the opinion." It is worthy of note that no evidence to rebut plaintiff's claimed injury was produced by defendants. Plaintiff and Dr. Diamond had related the facts claimed in the case history. The basis of Dr. Fox's limited opinion was, by competent evidence, already before the court, and to that extent was cumulative. We do not therefore consider it prejudicial error to admit his testimony, even though Dr. Fox was familiar with the history and did rely somewhat on statements made by plaintiff in the process of the examination. The trial court very carefully restricted the doctor's testimony so as to avoid, we think, the objectionable evidence within the hearsay and self-serving prohibition. We conclude the opinion of Dr. Fox as to the present physical condition of the plaintiff, wherein he did not consider history or X-rays in his expressed opinion on disability, resulted in no reversible error. VI. Defendants offered 22 instructions and objected to the correctness or sufficiency of many of the instructions given by the court. These offered instructions dealt with the matters heretofore discussed and, without extending this opinion unduly *91 by discussing each, it is sufficient to say we are content with the trial court's instructions and find in them no prejudicial error. Upon issues raised by defendants' counterclaim, the requested instructions largely refer to contentions pertaining to plaintiff's alleged negligence. The jury found for the plaintiff. In so doing, it found that the defendant Walters was negligent and that his negligence was the proximate cause of the collision. It found that plaintiff was free from contributory negligence. Therefore, as we have often said, if it was error for the court to have refused to submit any of the grounds referred to in instructions offered as to plaintiff's negligence, it was harmless error because the findings of the jury are fatal to defendants' counterclaim. Refusal to submit such issues was, therefore, not reversible error. Fagen Elevator v. Pfiester, 244 Iowa 633, 636, 637, 56 N.W.2d 577, and cases cited therein. VII. Finally we consider defendants' motion for a new trial based on the ground that the award was so excessive that it appeared to have been influenced by passion and prejudice. This is always a troublesome question for the appellate court. We have often said we rely greatly upon the judgment of the learned trial court, which is in a better position than we to decide such an issue. We are left to the cold record to decide whether or not the jury verdict went beyond the reasonable limits of the facts disclosed by the evidence. Each case, of course, must be determined by the pertinent facts disclosed by competent evidence. Jettre v. Healy, 245 Iowa 294, 60 N.W.2d 541, and cases cited therein; Hackman v. Beckwith, 245 Iowa 791, 64 N.W.2d 275; Stein v. Sharpe, 229 Iowa 812, 295 N.W. 155; Elings v. Ted McGrevey, Inc., 243 Iowa 815, 821, 822, 53 N.W.2d 882, and citations. For a rather complete discussion of this subject, see our current opinion in Henrich v. Oppedal (March, 1957), Iowa, 81 N.W.2d 429. Plaintiff's claim for personal injuries in the collision which caused but $76.27 damage to his vehicle, was based on a back injury which the treating doctor said gave him a ten per cent permanent disability. Plaintiff testified he had been to various doctors and taken various treatments, but showed only $47.00 actual medical expense. He had lost considerable time and had taken lighter work for a while which did not bring him his usual income of about $400.00 per month or a sixty per cent take from loads pulled by his tractor. No amount or value was given as to the lost time, although in a different part-time occupation in 1953 he only earned $700.00. He testified his earnings, when he returned to truck-driving, were curtailed, for he could not drive routes requiring driver handling of the heavy cargo, such as freight-peddling runs. He was forced to refuse such trips because of pains and faintness when he attempted to lift heavy objects. We find much merit in defendants' contention that there is a failure of clear and satisfactory proof as to the extent of the losses or damages suffered by plaintiff. Because of a permanent injury and the nature of his work, we could expect some reduction in his earning capacity. This actual reduction was not made clear, jonesstephen@example.org. He suffered pain and lost time, which was to some extent related. The evidence as to his total medical expense is lacking, and we are far from satisfied the record taken as a whole supports the liberal allowance made by the jury. As we said in Soreide v. Vilas & Co., Iowa, 78 N.W.2d 41, 50, and Booth v. General Mills, Inc., 243 Iowa 206, 210, 49 N.W.2d 561, the award in such cases is necessarily somewhat of an approximation and much must be left to the good judgment of the jury, but here we are convinced the verdict of $12,366.29 is not warranted by the evidence. Any sum in excess of $7,500 must be held to be excessive. If, therefore, within thirty days from the filing of this opinion, plaintiff shall remit all of the judgment in excess of $7,500.00 *92 with interest and costs, the judgment will be affirmed, otherwise reversed and remanded for a new trial. Affirmed on condition. WENNERSTRUM, HAYS, and PETERSON, JJ., concur. SMITH, J., concurs in result. THOMPSON, J., dissents in separate opinion. BLISS, C. J., and GARFIELD and OLIVER, JJ., joins in the dissent. THOMPSON, Justice (dissenting). Divisions I and III of the majority opinion seem to me to be unsound in reasoning and erroneous in the conclusions reached. I am constrained to dissent therefrom. I. Division I of the majority opinion holds that the trial court did not commit error in failing to instruct on section 321.354, Code of 1950, I.C.A., which was in effect at the time of the collision. It must be kept in mind that the plaintiff stopped his truck on the pavement; there is no dispute as to this. There is also substantial evidence that at the point where he stopped and for some distance ahead and back thereof there was a shoulder ten feet wide upon which he could have pulled his vehicle before stopping. Since the majority opinion omits some parts of section 321.354 which may have a bearing upon the question at issue, I set it out again more fully: "321.354 Stopping on traveled way. Upon any highway outside of a business or residence district no person shall stop, park, or leave standing any vehicle, whether attended or unattended, upon the paved or improved or main traveled part of the highway when it is practical to stop, park, or so leave such vehicle off such part of said highway, but in every event a clear and unobstructed width of at least twenty feet of such part of the highway opposite such standing vehicle shall be left for the free passage of other vehicles and a clear view of such stopped vehicle shall be available from a distance of two hundred feet in each direction upon such highway * * *." While it may not be material, I desire to correct the record made by the majority when it refers to the "predecessor" of section 321.354, designated as section 5054 of the Code of 1924. A part of this section is quoted; but very material parts are omitted, giving a much too inclusive meaning to the statute. The important omission from section 5054 as quoted follows the words "during any period of time." The statute follows this with "for one-half hour after sunset to one-half hour before sunrise." This section was limited to the hours set out. It did not apply to vehicles upon the highways during the daylight hours, and so far as the case at bar is concerned was in no sense a predecessor to section 321.354. Section 321.354 had no predecessor in our statute law for daytime hours, during which the accident with which we are here concerned happened. The important part of section 321.354 is the words "stop, park, or leave standing." The majority says: "primarily, this is a parking restriction statute." Then comes the erroneous reference to and partial quote from section 5054, Code of 1924, and then this language: "Clearly the word `stop' used in the statute is intended as synonymous with `park' or `leave standing'." It is at this point that I part company with the majority. It may be true that the word "park" includes stopping; but as the majority points out, there is more included in "parking" than merely stopping. If the statute is merely a parking statute, if "stop" is synonymous with *93 "park" or "leave standing", why is the word "stop" included? The rule of statutory construction is that meaning must be given to every word in the act, and that the legislature understood the meaning of the words it used and intended them all to have effect. 82 C.J.S., Statutes, § 316 b; 50 Am.Jur., Statutes, section 358. That construction is favored which will render every word operative, rather than one which eliminates some words, or makes them merely repetitious and of no effect. 50 Am.Jur., Statutes, section 358, supra. We have ourselves said that a construction making certain words in a statute redundant and useless will be avoided; it will not be presumed the legislature intended such a result. A statute should be interpreted, if possible, to give effect to all of the language used. Hartz v. Truckenmiller, 228 Iowa 819, 824, 293 N.W. 568, 571. We have also said that in construing a statute all the language is to be considered. Rohlf v. Kasemeier, 140 Iowa 182, 185, 186, 118 N.W. 276, 277, 23 L.R.A.,N.S., 1284. By what logic the majority avoids giving the word "stop" its usual meaning, as distinguished from "park" or "leave standing" is not clear to me, after a considerable study of the opinion. It seems evident that the legislature had something in mind in using it. It intended to prohibit something more than halting and leaving standing, or stopping and remaining standing. Other courts have had no difficulty in reaching the conclusion that "stop" in similar statutes was put there for a definite purpose. It adds a restriction which would not be present if the statute meant nothing more than "park, or leave standing." In Neeley v. Bock, 184 Wash. 135, 50 P.2d 524, 526, there is found this definition from 3 Berry on Automobiles, 7th Ed., page 130: "`Parking' within the meaning of regulatory statutes has been defined as the `voluntary act of leaving a car on the highway when not in use'; another court has stated that `to park' is `to permit a vehicle to remain standing on a public highway or street.' "It has been held that parking means something more than stopping temporarily or momentarily for a necessary purpose." The question was again before the Washington Supreme Court, in Sandona v. City of Cle Elum, 37 Wash.2d 831, 226 P.2d 889, 893. The case involved the construction of a city ordinance which contained the words "stop, stand or park." In answer to the contention that this was merely a parking ordinance and so did not apply to the standing of vehicles while they are being loaded or unloaded, the court said: "In the case at bar, we are concerned with the meaning of the words `stop, stand or park,' which are more definite and comprehensive than the phrase `park or leave standing.' The case cited is not here in point." It was also said in the same case at page 893 of 226 P.2d: "Appellants cite authorities to the effect that statutes or ordinances governing the parking of motor vehicles, which forbid parking or standing, do not prohibit commercial loading or unloading. These cases are not in point, as the ordinance in question forbids any person to `stop, stand or park a motor vehicle' within the prohibited area." In Gaches v. Daw, 168 Wash. 162, 10 P.2d 1111, 1114, where it appeared that the defendants had stopped their car on the highway to look at a direction sign and their automobile was struck by the plaintiff, the court approved an instruction which told the jury that if they stopped the car on the paved portion of the road when it was practicable for them to drive it off the highway, they would be negligent. The Indiana Supreme Court went into the matter at some length in Northern Indiana *94 Transit v. Burk, 228 Ind. 162, 89 N.E.2d 905, 907, 908, 17 A.L.R. 2d 572. The material part of the statute involved is quoted: "* * * every vehicle stopped or parked upon a roadway where there is an adjacent curb shall be so stopped or parked with the right hand wheels of such vehicle parallel with and within twelve (12) inches of the right hand curb." Burns' Ann.St. § 47-2123. A bus owned and operated by the appellant transit company had stopped at about a thirty degree angle with the curb to take on passengers, and was struck by an automobile. The appellee was a passenger in the bus and was injured in the collision. The Indiana Supreme Court used this cogent language in pointing out the distinction between stopping and parking: "There is a distinction between parking and stopping a motor vehicle. Webster's New International Dictionary, 2d Ed., defines the term `stop' to mean, `A cessation of motion, operation, progress, function, or the like.' Parking includes stopping, but stopping does not necessarily result in parking. A leading case on the question of parking has defined the term as follows: `* * * The term "parking" as applied to automobiles and automobile traffic, has a well-defined meaning, understood by all automobile drivers to mean not only the voluntary act of leaving a car on the street unattended but also the stopping of a car on the highway though occupied and attended for a length of time inconsistent with the reasonable use of a street, considering the primary purpose for which streets exist. Streets exist primarily for the purpose of travel.' "* * * The uniform act has been carefully prepared, and it is difficult to presume the draftsmen were careless in the use of language, or that in the many places where the word `stop' is used, it means not only stop but also parking, for parking under any possible definition includes stopping. Under appellant's contention the term `stop' would be mere surplusage in the act. Moreover, the dangers to the traveling public from stopping in an unreasonable manner may be just as serious as stopping a sufficient length of time to become parking." These authorities fully answer the majority position that our statute, section 321.354, supra, is no more than a parking statute and that the word "stop" therein is merely a synonym for "park" or "park, or leave standing." In fact, from the standpoint of common sense and logic, no authority should be needed to demonstrate that the legislature had a definite purpose in using the word "stop". The majority would eliminate it altogether. I cannot presume the legislature meant that it would have no meaning. The statute is worded in the disjunctivethat is, it reads "stop, park, or leave standing." (Italics supplied.) When possible, every word should be given meaning and force. The majority cites authorities to the effect that we should adopt that construction of the statute which will not entail unjust, unreasonable or absurd consequences. I do not disagree with this rule. But I do not find it applicable. On the other hand, I