TONGUE, J.
This is an action for damages for personal injuries sustained when plaintiff’s car collided with defendant’s Caterpillar tractor as the tractor was crossing a highway. The case was tried before a jury, which returned a verdict in favor of defendant, finding as a matter of comparative negligence that defendant’s negligence was less than plaintiff’s contributory negligence. Plaintiff then moved for a new trial, based primarily upon the failure of the court to instruct the jury relating to statutory requirements for headlights on defendant’s tractor. The trial court granted the motion for a new trial. Defendant appeals. We affirm.
The facts.
On November 18, 1972, at about 5 p.m., plaintiff, with four passengers, was proceeding south from Coos Bay on Highway 101, at a speed variously estimated at between 40 and 70 miles per hour. According to the [173]*173testimony, dusk was approaching and at least some cars on the highway had their lights on, although there was still enough daylight to see objects to some degree without lights. There was some conflict in the testimony whether it was misty or raining at the time of the accident or whether it had been misty or raining before the accident, but not at that time.
As plaintiff’s car came over the crest of a hill just north of the intersection of Highway 101 and Southport Road, defendant’s Caterpillar tractor was proceeding to cross the highway on Southport Road. At that point Highway 101 was a four-lane highway, with a center median strip.
Defendant had finished working with his tractor at a nearby log dump east of the highway and was proceeding on Southport Road to his home, which was located on that road west of the highway. Defendant testified that in crossing the highway he waited at the median strip before crossing the two south bound traffic lanes. He testified that he could see north on the highway to the crest of the hill some 500 to 700 feet away and that after waiting for one car to pass he started to cross the highway at right angles to it. His tractor was equipped with recessed front headlights and with a recessed white taillight, none of which were operable at that time. There were no reflectors on the side of the tractor, which was painted yellow.
Plaintiff testified that his car had its lights on and was in the outside lane of the highway as he came over the crest of the hill and that he did not see defendant’s tractor until too late to avoid hitting it. He then applied his brakes, but could not stop, and ran into the side of the tractor, which was then in the outside southbound traffic lane, and was proceeding at a speed of about four or five miles per hour. Defendant testified that the left lane was clear and that plaintiff had previously changed from the left to the right lane.
[174]*174The order allowing plaintiff’s motion for a new trial was based upon findings and conclusions that plaintiff had requested “statutory instructions pertaining to vehicle lighting”; that defendant “did not have lighting” on his tractor; that “the court erred in holding that defendant’s vehicle was exempt as a matter of law from these lighting requirements,” and that this error was prejudicial.
Four basic questions are presented by this appeal: (1) Do the statutory lighting requirements for motor vehicles apply to a tractor crossing a highway? (2) Was plaintiff entitled to such “statutory instructions” when, as in this case, the tractor was crossing the highway at right angles? (3) If the court erred in its holding that defendant’s tractor was not subject to the statutory lighting requirements for motor vehicles, was that error preserved by plaintiff at the time of trial by proper objection or exception? and (4) If not, can such an error be the ground for the granting of a new trial?
1. The statutory requirements for the lighting of motor vehicles are applicable to a tractor when operated on a highway.
ORS 483.402 provides:
“When lights are required tobe on; application of visibility and height provisions. (1) Subject to the specific exceptions with respect to parked vehicles, lighted lamps and illuminating devices as specified in ORS 483.402 to 483.442 shall be displayed by:
“(a) Every vehicle upon a highway within this state at any time from a half-hour after sunset to a half-hour before sunrise and at any other time when, due to insufficient light or unfavorable atmospheric conditions, persons and vehicles are not clearly discernible on such highway at a distance of 500 feet ahead.
[175]*175OES 488.404 provides:
“Head lights required; lighting and braking equipment on bicycles. (1) Every motor vehicle other than a motorcycle shall be equipped with at least two head lamps, at least one on each side of the front of the vehicle.
At the time of trial the trial court was under the impression that defendant’s tractor was exempt from these requirements under OES 483.032(3) which provides that:
“The provisions of this chapter with respect to equipment on vehicles do not apply to implements of husbandry, road machinery, road rollers, farm tractors or vehicles described in paragraph (2) of subsection (4) of OES 481.205 [i.e., historic vehicles maintained as collectors’ items], except where expressly made applicable.”
OES 483.012 defines an “implement of husbandry” as follows:
“(1) ‘Implement of husbandry’ means every vehicle designed exclusively for use in agricultural operations. ‘Implement of husbandry’ does not include vehicles designed exclusively for the transportation of persons or property.”
A “farm tractor” is defined by OES 483.008 as follows :
“(3) ‘Farm tractor’ means any self-propelled vehicle designed primarily for use in agricultural operations for drawing or operating plows, mowing machines and other farm equipment or implements of husbandry.”
The terms “road machinery” and “road rollers” are not defined by the Motor Vehicle Code. Defendant’s Caterpillar tractor was clearly not within any of the foregoing classifications.
In other words, although defendant’s tractor may [176]*176have been prohibited by ORS 483.516 from operating on a highway because it was a tractor with caterpillar metal treads, when defendant undertook to operate that tractor on a highway at night it was a “motor vehicle” and, as such, was subject to the statutory requirements for headlights and taillights on all motor vehicles when operated on the public highways of this state. Needless to say, these statutory provisions require that such headlights and taillights be in operating condition, which was not true of the headlights and taillights on defendant’s tractor.
It follows, as recognized by the trial court on plaintiff’s motion for a new trial, that it erred at the time of trial in holding that defendant’s tractor was exempt as a matter of law from such statutory lighting requirements.
2. The statutory lighting requirements were applicable in this case despite the fact that defendant’s tractor was crossing the highway at right angles to plaintiff’s car.
Defendant contends that because the provisions of ORS 483.402 and 483.406 speak in terms of headlights “visible from a distance of 500 feet, to the front of such vehicle,” these statutory requirements have no application to a motor vehicle which is struck while crossing a highway by a vehicle approaching from the side, at right angles, rather than from the front. Thus, defendant argues that an instruction to the jury in this case stating the statutory requirements for headlights for defendant’s tractor would be “inappropriate unless there was some evidence that such lighting would have made any difference and even if it would, that the statutes # # * were enacted for the purposes claimed by plaintiff.”
In support of that contention defendant cites Spence, Adm’x v. Rasmussen et al, 190 Or 662, 226 P2d [177]*177819 (1951), involving a bicycle without a front lamp, as required by statute, and which was struck from the rear by an automobile. In that case we said (at 678) that head lamp requirements for bicycles were “designed for the benefit of those approaching from the front” and (at 680) that “there is no evidence * * * that if the front lamp on this bicycle had been burning it could have been better seen by one operating a motor vehicle from the rear,” with the result that it was improper to instruct the jury on the statutory requirements for bicycle head lamps. We also said, however (at 679), that “the requirements of the statute respecting front lamps on motor vehicles have entirely different purposes than the statúte respecting bicycle lamps.”
Defendant has cited no eases involving vehicles crossing a highway or proceeding through an intersection at night without headlights on. Although this court has not previously considered such a case, courts of other states have considered such cases and appear to hold that the failure of a motorist to have his headlights on after dark is actionable negligence in intersection collisions. As stated in Annotation, Driving Motor Vehicle Without Lights or With Improper Lights as Affecting Liability for Collision, 21 ALR2d 7, 41, 43 (1952):
“The function of head-lamp beams as a warning to other motorists, rather than as a means of illumination to the driver, is of especial importance in the cases involving intersectional collisions between crossing cars * * *.
a* # * # *
“Driving an unlighted motor vehicle into an in[178]*178tersection or across the path of another vehicle, causing a collision, has been held in some cases to be negligence rendering the defendant liable as a matter of law * *
Numerous cases support these propositions. See, e.g., Normand v. Piazza, 145 So 2d 110, 112 (La App 1962); Meehl v. Barr Transfer Co., 296 Mich 697, 296 NW 844, 846 (1941); and Rogers v. Bouchard, 60 Tenn App 555, 449 SW2d 431, 437-38 (1969). See also Butter v. Cromartie, 339 Mass 4, 157 NE2d 649, 651 (1959); Estate of Dauer v. Zabel, 19 Mich App 198, 172 NW2d 701, 708 (1969); and Craig v. Gottlieb, 161 Pa Super 526, 55 A2d 573, 574 (1947).
We agree with these cases and hold that in cases involving vehicles crossing highways or through intersections at night without their headlights on, and which collide with cars approaching at right angles, as in this case, an appropriate instruction should be given relating to the duty of the drivers of such vehicles to have their headlights on.
3. No proper requests were made by plaintiff for appropriate instructions on the statutory requirements for headlights on defendant’s tractor.
Defendant further contends that plaintiff made no proper request for appropriate instructions on the statutory requirements for headlights on defendant’s tractor. We agree.
Aside from the fact that plaintiff did not serve and file requested instructions in writing at the beginning of the trial, as apparently required by Rule 28 of the Rules of Court for Coos and Curry Counties, plaintiff’s requests for instructions on the statutory requirements for headlights were clearly insufficient.
The only request by plaintiff’s counsel was an oral request for “the following ORS statutory instructions,” including 483.402, 483.404, 483.406, 483.408, [179]*179483.114 and 483.423. That request was denied, not on the ground that the request was not timely, written, or sufficiently specific, hut upon the ground that under ORS 483.032 defendant’s tractor was not subject to these statutory requirements — a reason which the trial court later, on plaintiff’s motion for new trial, concluded to be in error.
Nevertheless, if plaintiff’s motion for a new trial had been denied and if this were an appeal from the resulting judgment for defendant, plaintiff’s appeal would fail because of the insufficiency of plaintiff’s request for instructions on the statutory requirements for headlights. Plaintiff places primary, if not sole, reliance in this appeal upon its requests for instructions on ORS 483.402 and 483.404. An examination of these statutes, as quoted above, reveals that they refer to other statutes and include subsections which have no application to this ease. Thus, the trial court would have been required to make various deletions in preparing an appropriate instruction under either of these statutes.
It is fundamental that a request for an instruction may properly be denied, without error, unless the requested instruction is clear and correct in all respects, both in form and in substance, and unless it is altogether free from error. Hotelling v. Walther, 174 Or 381, 387-88, 148 P2d 933 (1944); Wiebe v. Seely, Administrator, 215 Or 331, 360, 335 P2d 379 (1959); Stanich v. Buckley et al, 230 Or 126, 132, 368 P2d 618 (1962); Owings v. Rose', 262 Or 247, 258, 497 P2d 1183 (1972). The trial court cannot be required to edit requested instructions and to omit parts that are incorrect or inapplicable. See Brigham v. Southern Pacific Co., 237 Or 120, 124, 390 P2d 669 (1964).
It does not necessarily follow, however, that the trial court could not properly grant a new trial in this case.
[180]*1804. The trial court’s failure to give any instructions on the statutory requirements for headlights on defendant’s tractor was error and, even though not properly objected to, was sufficient for the granting of a new trial.
It is fundamental that a new trial may be ordered by a trial court only for prejudicial error,② despite what has been referred to as “loose expressions” in some of our cases to the effect that a trial court may grant a new trial as a matter of discretion, subject to reversal only for abuse of discretion.③
[181]*181It is true, however, that when error has been committed this court, in determining on an appeal from an order granting a new trial whether such error was so prejudicial as to prevent a party from having a fair trial, usually defers to the discretion of the trial court.④ It has also been said that a stronger showing is required to reverse an order granting a new trial than to reverse an order denying a new trial.⑤
Upon a review of our previous decisions in which orders granting new trials have been affirmed for prejudicial error it appears that such cases fall into three categories: (1) Cases in which such orders have allowed motions for new trials based upon grounds specified in OR.S 17.610, including “error in [182]*182law occurring at the trial, and excepted to by the party making the application”;⑥ (2) Cases in which trial courts have granted new trials upon their “own motion”;⑦ and (3) Cases in which new trials were granted because of substantial and prejudicial error to which no proper exception or objection was taken, but which were raised by motion for new trial, rather than by a trial court on its own motion, as next discussed.
In this case a new trial could not be properly granted under ORS 17.610(7) for “errors in law” which were “excepted to,” because no proper request was made for the instructions on statutory headlight requirements. Neither could the court grant a new trial in this case “on its own motion” for its error in refusing to give such instructions, on the ground that defendant’s traetor was exempt from such statutes, because the order granting the new trial was not entered within 30 days from entry of judgment, as required by ORS 17.630. Thus, the granting of the new trial in this case can be sustained only under the third of these categories, provided that the requirements established by previous decisions of this court are satisfied in this case.
Prior to the adoption in 1933 of what is now ORS 17.630, a trial court was not required to act within [183]*18330 days in granting a new trial on its own motion. As a result, when a motion for new trial was based upon some error which was prejudicial, hut to which no proper objection or exception was taken as to provide a basis for a motion for a new trial under OES 17.610, the trial court could grant a new trial in such a case “on its own motion” for prejudicial error.
Thus, in Archambeau v. Edmunson, 87 Or 476, 486, 171 P 186 (1918), this court said that a trial court might properly order a new trial for error, even if no proper objection or exception was taken, if the error was such that “if properly excepted to or seasonably called to the attention of the court and the motion denied would have been sufficient cause for a reversal” and if the trial court was satisfied that the party had not had a fair trial. On that basis, orders allowing motions for new trial were affirmed for prejudicial errors even though such motions were not based upon errors in law to which exceptions had been taken, as required by what is now OES 17.610(7).⑧
In 1933 what is now OES 17.630 was enacted, requiring that when a trial court grants a new trial on its own motion it must do so “within 30 days after the filing of the judgment” and that the order “shall contain a statement setting forth fully the grounds upon which the order was made.”⑨ For some time, this court continued to affirm orders granting motions for new trials for errors to which no objections or exceptions were taken without discussion whether such orders were granted by the trial courts on their own motion within 30 days.⑩
[184]*184Finally in Rosencrans et ux v. Bennett et ux, 193 Or 45, 236 P2d 798 (1951), a trial court was reversed for allowing a new trial where a motion for a new trial had been filed, but where the order for new trial was based upon errors to which no objections or exceptions had been taken and which was not entered within 30 days after judgment. This court said (at 49-50) that, in determining whether that order was entered by the trial court “on its own motion” (so as to be required to be filed within 30 days) or was an order based upon the motion for a new trial, this court would “look to defendant’s motion to see if there was anything in it which sustained the reasons given by the court for granting a new trial.” Finding that this requirement was not satisfied in that case, this court reversed the granting of the new trial because that order was not entered within 30 days.
Two years later, however, in Correia v. Bennett and Johnson et ux, 199 Or 374, 261 P2d 851 (1953), this court affirmed an order granting a new trial where the motion for a new trial specifically stated that it was based in part upon error to which no proper objection or exception had been taken (quoting Archambeau v. Edmunson, supra) and where the order granting the new trial was not entered within the 30-day period required for new trials granted by a trial court on its own motion. In so holding, this court said (at 381):
“* * * The mere fact that no exception was saved at the time of trial did not bar defendant from thus claiming error on account thereof in his motion for a new trial, nor did the court’s action in adopting that ground as the basis of its order granting a-new trial give to the order the character of one ‘granted on the court’s own motion.’ ”
and (at 382):
“* * * Where such error occurs on a trial, whether excepted to or not, it may form the ground [185]*185of a motion for a new trial, and such motion, based thereon, may properly be allowed. Or, for such error appearing of record, the trial court may at any time within 30 days after the entry of judgment award a new trial on its own motion.”⑪
In this case defendant’s motion was based, among other things, upon “error in law in the court refusing to give statutory instructions pertaining to vehicle lighting requested by the plaintiff OES 483.402, 483.404 * * As previously noted, no proper request was made to the trial court for the giving of such instructions.
The order granting the new trial in this case was based upon a finding and conclusion, among other things, that
“The question whether Defendant’s vehicle was one of those exempted from the lighting requirements of the above cited statutes by OES 483.032(3) was properly a question for the jury, and the court erred in holding that the Defendant’s vehicle was exempted as a matter of law from these lighting requirements.”
That order was also based upon a finding that “the court’s error was prejudicial to plaintiff.”
In our judgment, the grounds stated in plaintiff’s motion for a new trial were sufficiently related to and supportive of the grounds stated in the order granting the new trial so as to satisfy the test as stated in Rosencrans and the rule as stated in Correia.
It may be contended, as urged by the dissent[186]*186ing opinion, that the rule as stated in Correia is unsound in that the effect of that rule is to recognize grounds for a motion for a new trial in addition to those stated in OES 17.610(7), which refers to “error in law * * * excepted to * * *” as a ground for a new trial, whereas the rule of Correia would also recognize “error in law not excepted to,” as a ground for a new trial. To the same effect, it may be contended, as also urged by the dissenting opinion, that although a trial judge may have power to grant a new trial for error at law not excepted to, if he does so he must act on his own motion and within 30 days and that this was the purpose of OES 17.630.
No such contentions, however, are made by the appellant in this case and its reply brief does not controvert the contention in respondent’s brief, consistent with the rule of Correia, that:
“* * * A new trial may be granted, either on motion of the trial court or on the plaintiff’s motion, for prejudicial error in instructing the jury even though the aggrieved party, has made no proper request for an instruction or even though he has made no exception to an instruction erroneously given. * * *”
Under these circumstances, and because the trial court could have easily granted plaintiff’s motion for a new trial within 30 days if there had been any previous indication by the court that Correia may be overruled as stating an unsound rule, we decline to consider those contentions in this case. It follows that the order of the trial court granting a new trial was proper for the purposes of this case, even though not entered within 30 days.
5. The trial court could properly find that the error in failing to give the instruction was prejudicial.
Finally, we must consider the holding of the trial court that the error in its previous ruling that [187]*187plaintiff was not entitled to instructions on the statutory requirements for headlights, as applied to defendant’s tractor, was a prejudicial error and, as such, provided a sufficient basis for the granting of a new trial.
As previously noted,⑫ we have held in many cases that when error has been committed we ordinarily accord considerable latitude to the trial court in its determination whether such an error was prejudicial so as to provide a proper basis for the granting of a new trial when it appears that the chance of prejudice is substantial.
It is established in Oregon that “if a litigant can prove that his adversary violated a statute enacted to regulate * * * the equipment * * * of motor vehicles, he is entitled to an instruction that such conduct is negligence.” McConnell v. Herron, 240 Or 486, 490, 492, 402 P2d 726 (1965). If, in such a case, the defendant produces evidence that he nevertheless acted as a reasonably prudent person under the circumstances, he is then entitled to an instruction to that effect, but, in any event, plaintiff is entitled to the initial instruction on violation of the statute. See Barnum v. Williams, 264 Or 71, 78-79, 504 P2d 122 (1972). Accordingly, the trial court was correct in this case in holding that plaintiff was entitled to an instruction on the requirements of the headlight statute.
Under the instructions on common law negligence, as given by the trial court, the jury found that defendant’s negligence contributed 86 per cent to the accident. Under these circumstances, we agree with the trial court in its holding that plaintiff was prejudiced by its failure to give the instruction to which plaintiff was entitled in terms of the strong and mandatory requirements of the headlight statute, rather than in the [188]*188more innocuous terms of a common law duty to “illuminate Ms veMcle” when a reasonable person would do so. Had such an instruction been given the jury might well have found that defendant’s negligence exceeded 50 per cent, rather than 36 per cent.
Considering the wide latitude which we have always accorded to trial courts in determining whether error is prejudicial, we cannot say that this trial court, based upon its observation of the conduct of the trial, including the effect upon the jury of argument by counsel and instructions by the court on the subject of headlights, was wrong in its holding to the effect that plaintiff was prejudiced by the failure to give such an instruction.⑬
For these reasons we affirm the order of the trial court granting a new trial.⑭
Defendant also cites Dormaier v. Jesse et al, 230 Or 194, 369 P2d 131 (1962), involving a vehicle stopped in a dust storm without lights and hit from the rear by another car, in which we said (at 198) that there was no evidence that the lighting of the car had any causal relationship with the accident.