OPINION
BRYNER, Chief Judge.
Patrick A. Comeau was convicted by a jury of driving while intoxicated (DWI), in violation of AS 28.35.030. At trial, he requested an instruction allowing the jury to consider reckless driving, AS 28.35.040, as a lesser-included offense of DWI. The trial court declined to give the requested instruction. Comeau appeals, contending that the trial court erred in its ruling. We reverse.
Under Alaska Rule of Criminal Procedure 31(c), “[a] defendant may be found guilty of an offense necessarily included in the offense charged....” An offense is “necessarily included in the offense charged” when it is impossible to commit the charged offense without also committing the included offense. Minano v. State, 690 P.2d 28, 31 (Alaska App.1984), rev’d on other grounds, State v. Minano, 710 P.2d 1013, 1016 (Alaska 1985). When a lesser offense is necessarily included in the offense charged, the jury must be instructed on the included offense if an element distinguishing the greater offense from the lesser is actually in dispute. Rice v. State, 589 P.2d 419, 420 (Alaska 1979); Blackhurst v. State, 721 P.2d 645, 648 (Alaska App.1986). Failure to instruct on a lesser-included offense violates the accused’s right to fundamental fairness and is reversible error. Christie v. State, 580 P.2d 310, 318 (Alaska 1978).
Two approaches have been developed for determining whether a lesser offense is necessarily included in the offense charged, the statutory elements approach and the cognate approach. Both focus on the same fundamental question: would commission of the offense charged be possible without commission of the lesser offense? Each approach resolves this question from a slightly different perspective. The statutory elements approach focuses narrowly and exclusively on the elements of the greater and lesser offenses, as defined by statute. The cognate approach concentrates more broadly and realistically on the facts charged in the complaint or indictment and on the evidence actually presented at trial. State v. Minano, 710 P.2d at 1016; Blackhurst v. State, 721 P.2d at 648; Norbert v. State, 718 P.2d 160, 162-63 (Alaska App.1986).
Alaska has adopted the cognate approach. State v. Minano, 710 P.2d at 1016; Elisovsky v. State, 592 P.2d 1221, 1226 (Alaska 1979). Accordingly, a review of the evidence presented against Comeau at trial is crucial to the determination of [110]*110whether, in his case, reckless driving was a necessarily included offense of DWI.
The state’s theory was in essence that Comeau drove while actually impaired by alcohol and recklessly caused an accident. The evidence tended to establish that, while driving on College Road in Fairbanks, Co-meau lost control of his car, swerved suddenly and for no apparent reason into the path of another automobile, and caused a collision. Comeau left the scene without identifying himself to the other driver or reporting the accident. When he was apprehended several hours later, he was given a breath test, which revealed a blood alcohol level of .134, well above the presumptive level of intoxication. Extrapolation based on the assumption that Comeau had consumed no alcohol after the accident yielded an estimated blood alcohol level of between .15 and .22 at the time of the accident.
The only evidence of Comeau’s driving was the evidence establishing his involvement in the accident. As evidence of intoxication, the state relied on Comeau’s involvement in the accident and on his test results. The only theory of DWI submitted to the jury was that Comeau’s driving was actually impaired by his consumption of alcohol; the jury was not given the option of finding Comeau guilty on the theory that his blood alcohol level exceeded the permissible statutory maximum.1
For his part, Comeau did not dispute that he had been driving and was involved in an accident. He testified, however, that the accident was entirely the fault of the other motorist and that his driving was not impaired by his prior consumption of alcohol. According to Comeau, his high breath test resulted from alcohol that he had consumed between the time of the accident and his arrest.
Based on this evidence, we must determine whether a rational juror could have found Comeau guilty of DWI but not guilty of reckless driving. The evidence left several possibilities open to the jury. The first two are obvious: the jury could have accepted the state’s evidence in its entirety and convicted Comeau of DWI, or it could have accepted Comeau’s testimony completely and acquitted him.
A third possibility open to the jury under the evidence was to accept the state’s theory that Comeau was responsible for the accident but to conclude that there was a reasonable doubt as to his intoxication when the accident occurred. The possibility of the jury reaching this result arose from the significant lapse of time between the accident and Comeau’s apprehension, and from Comeau’s testimony that he had consumed alcohol after the accident occurred. By expressly contesting the issue of his intoxication at the time of the accident, Comeau placed in dispute the principal element distinguishing the crime charged, DWI, from the lesser offense of reckless driving.
The fourth, and last, possible outcome open to the jury is the critical one. Because Comeau disputed his responsibility for the accident as well as his intoxication when it occurred, it is at least conceivable that the jury could have concluded that his driving at the time of the accident was actually impaired by his consumption of alcohol but that the accident nevertheless [111]*111occurred through no fault of his own.2 It is this possible outcome that raises the central question whether Comeau could have been convicted of drunken driving but acquitted of reckless driving. Only if Co-meau could not have been convicted of DWI without also being convicted of reckless driving would the latter offense be necessarily included in the former. See Alaska R.Crim.P. 31(c).
If the issue of recklessness depended on Comeau’s fault in causing the accident it would be apparent that, under the fourth possible outcome, he could be convicted of DWI without also being convicted of reckless driving. However, Comeau’s recklessness cannot properly be made to turn on his responsibility for the accident. For if Comeau drove while actually impaired by alcohol, he drove recklessly, regardless of who was at fault in the accident. To conclude otherwise would be to hold that a person who drives drunkenly on a public roadway in the presence of other cars is not reckless unless that person actually causes an accident. Although that is the view taken in the dissenting opinion, it is foreclosed by prior decisions of the Alaska Supreme Court and this court.3
In Lupro v. State, 603 P.2d 468 (Alaska 1979), the defendant drove while he was intoxicated, became involved in an accident that caused the death of a pedestrian, and was convicted of manslaughter. Under the law applicable at the time, manslaughter was defined as a homicide resulting from the “culpable negligence” of the accused. See
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OPINION
BRYNER, Chief Judge.
Patrick A. Comeau was convicted by a jury of driving while intoxicated (DWI), in violation of AS 28.35.030. At trial, he requested an instruction allowing the jury to consider reckless driving, AS 28.35.040, as a lesser-included offense of DWI. The trial court declined to give the requested instruction. Comeau appeals, contending that the trial court erred in its ruling. We reverse.
Under Alaska Rule of Criminal Procedure 31(c), “[a] defendant may be found guilty of an offense necessarily included in the offense charged....” An offense is “necessarily included in the offense charged” when it is impossible to commit the charged offense without also committing the included offense. Minano v. State, 690 P.2d 28, 31 (Alaska App.1984), rev’d on other grounds, State v. Minano, 710 P.2d 1013, 1016 (Alaska 1985). When a lesser offense is necessarily included in the offense charged, the jury must be instructed on the included offense if an element distinguishing the greater offense from the lesser is actually in dispute. Rice v. State, 589 P.2d 419, 420 (Alaska 1979); Blackhurst v. State, 721 P.2d 645, 648 (Alaska App.1986). Failure to instruct on a lesser-included offense violates the accused’s right to fundamental fairness and is reversible error. Christie v. State, 580 P.2d 310, 318 (Alaska 1978).
Two approaches have been developed for determining whether a lesser offense is necessarily included in the offense charged, the statutory elements approach and the cognate approach. Both focus on the same fundamental question: would commission of the offense charged be possible without commission of the lesser offense? Each approach resolves this question from a slightly different perspective. The statutory elements approach focuses narrowly and exclusively on the elements of the greater and lesser offenses, as defined by statute. The cognate approach concentrates more broadly and realistically on the facts charged in the complaint or indictment and on the evidence actually presented at trial. State v. Minano, 710 P.2d at 1016; Blackhurst v. State, 721 P.2d at 648; Norbert v. State, 718 P.2d 160, 162-63 (Alaska App.1986).
Alaska has adopted the cognate approach. State v. Minano, 710 P.2d at 1016; Elisovsky v. State, 592 P.2d 1221, 1226 (Alaska 1979). Accordingly, a review of the evidence presented against Comeau at trial is crucial to the determination of [110]*110whether, in his case, reckless driving was a necessarily included offense of DWI.
The state’s theory was in essence that Comeau drove while actually impaired by alcohol and recklessly caused an accident. The evidence tended to establish that, while driving on College Road in Fairbanks, Co-meau lost control of his car, swerved suddenly and for no apparent reason into the path of another automobile, and caused a collision. Comeau left the scene without identifying himself to the other driver or reporting the accident. When he was apprehended several hours later, he was given a breath test, which revealed a blood alcohol level of .134, well above the presumptive level of intoxication. Extrapolation based on the assumption that Comeau had consumed no alcohol after the accident yielded an estimated blood alcohol level of between .15 and .22 at the time of the accident.
The only evidence of Comeau’s driving was the evidence establishing his involvement in the accident. As evidence of intoxication, the state relied on Comeau’s involvement in the accident and on his test results. The only theory of DWI submitted to the jury was that Comeau’s driving was actually impaired by his consumption of alcohol; the jury was not given the option of finding Comeau guilty on the theory that his blood alcohol level exceeded the permissible statutory maximum.1
For his part, Comeau did not dispute that he had been driving and was involved in an accident. He testified, however, that the accident was entirely the fault of the other motorist and that his driving was not impaired by his prior consumption of alcohol. According to Comeau, his high breath test resulted from alcohol that he had consumed between the time of the accident and his arrest.
Based on this evidence, we must determine whether a rational juror could have found Comeau guilty of DWI but not guilty of reckless driving. The evidence left several possibilities open to the jury. The first two are obvious: the jury could have accepted the state’s evidence in its entirety and convicted Comeau of DWI, or it could have accepted Comeau’s testimony completely and acquitted him.
A third possibility open to the jury under the evidence was to accept the state’s theory that Comeau was responsible for the accident but to conclude that there was a reasonable doubt as to his intoxication when the accident occurred. The possibility of the jury reaching this result arose from the significant lapse of time between the accident and Comeau’s apprehension, and from Comeau’s testimony that he had consumed alcohol after the accident occurred. By expressly contesting the issue of his intoxication at the time of the accident, Comeau placed in dispute the principal element distinguishing the crime charged, DWI, from the lesser offense of reckless driving.
The fourth, and last, possible outcome open to the jury is the critical one. Because Comeau disputed his responsibility for the accident as well as his intoxication when it occurred, it is at least conceivable that the jury could have concluded that his driving at the time of the accident was actually impaired by his consumption of alcohol but that the accident nevertheless [111]*111occurred through no fault of his own.2 It is this possible outcome that raises the central question whether Comeau could have been convicted of drunken driving but acquitted of reckless driving. Only if Co-meau could not have been convicted of DWI without also being convicted of reckless driving would the latter offense be necessarily included in the former. See Alaska R.Crim.P. 31(c).
If the issue of recklessness depended on Comeau’s fault in causing the accident it would be apparent that, under the fourth possible outcome, he could be convicted of DWI without also being convicted of reckless driving. However, Comeau’s recklessness cannot properly be made to turn on his responsibility for the accident. For if Comeau drove while actually impaired by alcohol, he drove recklessly, regardless of who was at fault in the accident. To conclude otherwise would be to hold that a person who drives drunkenly on a public roadway in the presence of other cars is not reckless unless that person actually causes an accident. Although that is the view taken in the dissenting opinion, it is foreclosed by prior decisions of the Alaska Supreme Court and this court.3
In Lupro v. State, 603 P.2d 468 (Alaska 1979), the defendant drove while he was intoxicated, became involved in an accident that caused the death of a pedestrian, and was convicted of manslaughter. Under the law applicable at the time, manslaughter was defined as a homicide resulting from the “culpable negligence” of the accused. See former AS 11.15.080. Lupro challenged his conviction on appeal, contending that, in order to establish culpable negligence, the state was required to prove not only that he drove while intoxicated but also that he committed some additional act of negligence. Lupro, 603 P.2d at 474-75.
The supreme court squarely rejected this argument. The court first defined “culpable negligence,” as follows:
In order to establish culpable negligence the state must show a degree of conduct [112]*112more wanton and reckless than that involved in ordinary negligence ...[,] “a reckless disregard of consequences, a needless indifference to the rights and safety and even the lives of others.”
Lupro, 603 P.2d at 475 (citations omitted). This definition is synonymous with the traditional definition of recklessness. See St John v. State, 715 P.2d 1205, 1208-09 (Alaska App.1986).
Applying this definition, the Lupro court went on to hold that a person who drives while intoxicated is culpably negligent as a matter of law:
We believe that a person who drives while he is so intoxicated that he cannot control his actions falls within this definition. “One who is considerate of the rights of others does not drive while he is drunk.” Where there is sufficient evidence that the driver was intoxicated at the time of the accident the state need only show beyond a reasonable doubt that the intoxication was the cause of the victim's death....
... Before reaching a verdict of guilty it was necessary only that each juror find that the defendant had been driving while intoxicated and that this was the proximate cause of the accident.
Lupro, 603 P.2d at 475 (citation omitted). The unmistakable import of the court’s holding in Lupro is that, under the traditional definition of recklessness, a person who drives while actually impaired by alcohol is per se reckless.
Nevertheless, the law governing recklessness for most crimes has now changed. The Alaska Revised Criminal Code, which took effect after Lupro was decided, has divided the former concept of “culpable negligence” into two distinct but related culpable mental states: recklessness and criminal negligence. See AS 11.81.900(a)(3) and (4).4 Under the current statutory definitions, the level of risk necessary for both recklessness and criminal negligence is identical: both standards require conduct that creates “a substantial and unjustifiable risk” — that is,
[t]he risk must be of such nature and degree that disregard of it [or ‘the failure to perceive’ it] constitutes a gross deviation from the standard of care that a reasonable person would observe_
AS 11.81.900(a)(3). This level of risk is substantially similar to the risk required under Lupro to establish culpable negligence. See St. John v. State, 715 P.2d at 1208-09.
The only distinction drawn by the revised criminal code between recklessness and criminal negligence lies in the accused’s subjective perception of the risk posed by the accused’s conduct. Recklessness occurs when the defendant is “aware of and consciously disregard[s]” the risk. See AS 11.81.900(a)(3). Criminal negligence results when the defendant merely “fails to perceive” that risk. See AS 11.81.900(a)(4). The current statutory definition of “recklessly” further provides, however, that “a person who is unaware of a risk of which the person would have been aware had that person not been intoxicated acts recklessly....”
This court has had occasion to review Lupro in light of the intervening changes in the statutory definition of recklessness. In so doing, we have expressly recognized the continued vitality of the supreme [113]*113court’s decision. In Edgmon v. State, 702 P.2d 643 (Alaska App.1985), we considered these statutory provisions in the context of a drunken driving manslaughter prosecution. We concluded that, in determining whether an intoxicated person has acted recklessly or with criminal negligence, the issue of whether that person “is unaware of a risk of which the person would have been aware had that person not been intoxicated” is a question of fact. Thus, we held that, to prove recklessness as opposed to criminal negligence, “[t]he state [was] ... obligated to prove that Edgmon, given his faculties, his education, his experience, and his intelligence, would have perceived the risk [posed by his drunken driving] but for his intoxication.” Id. at 645.
Implicit in our holding in Edgmon is the recognition that, under the statutory definitions set out in AS 11.81.900(a)(3) and (4), a person who drives while intoxicated must either be reckless or criminally negligent. What was implicit in Edgmon we made explicit in St. John v. State, 715 P.2d 1205 (Alaska App.1986).
In St. John, another drunken driving manslaughter case, the trial judge instructed the jury that it was required to find that the defendant acted recklessly if it found that he drove while intoxicated. In addressing a challenge to this instruction, we specifically recognized that the basic holding in Lupro continued to apply to the statutory definitions of recklessness and criminal negligence found in the revised criminal code:
In summary, evidence that a defendant drove while intoxicated and, as a result, caused the death of another person, may establish a prima facie case of the recklessness necessary for a finding that the defendant committed manslaughter.
715 P.2d at 1209.
We nevertheless concluded that the instruction challenged in St. John was improper for two reasons. First, relying on our prior decision in Edgmon, we noted that the question of whether drunken driving amounted to recklessness, as opposed to criminal negligence, was an issue of fact for the jury. Because the jury might have found either recklessness or criminal negligence, we concluded that it was error to instruct that drunken driving was tantamount to recklessness. 715 P.2d at 1209. Second, relying on case law prohibiting the use of mandatory presumptions in criminal cases, see Francis v. Franklin, 471 U.S. 307, 105 S.Ct. 1965, 85 L.Ed.2d 344 (1985), Connecticut v. Johnson, 460 U.S. 73, 103 S.Ct. 969, 74 L.Ed.2d 823 (1983), we held that the legal relationship between drunken driving and recklessness should have been communicated to the jury in the form of a permissive inference rather than a mandatory presumption. Id. at 1209-10 & n. 2.
Neither of the grounds we relied on for reversal in St. John erodes the validity of the primary holding in Lupro. While St. John recognizes that drunken driving may amount to either recklessness or criminal negligence, by so doing it establishes that a person who drives on a public roadway while actually impaired by alcohol is at least criminally negligent. Beyond that, St. John stands for the proposition that the trial court cannot, by the use of a mandatory presumption, usurp the jury’s role of deciding whether the state has proved all the elements of the offense. This proposition has no bearing whatsoever on whether a person who engages in drunken driving necessarily acts recklessly.5
[114]*114When read together, the holdings in Lupro, Edgmon, and St. John establish beyond dispute that a person convicted of driving on a public roadway, in the presence of other traffic, while actually impaired by alcohol, is also necessarily guilty of driving recklessly or with criminal negligence, as those terms are defined in the revised criminal code.6 Applying the settled rules governing lesser-included offenses to the definition of recklessness and criminal negligence contained in the revised criminal code, it follows that lesser-included offense instructions on reckless and negligent driving would be required in a DWI prosecution whenever the element of intoxication was disputed and whenever the prosecution supported its case by proof that the defendant actually drove in an erratic or dangerous manner.7
Nevertheless, this conclusion does not fully resolve the issue presented in Comeau’s case. The offenses of reckless and negligent driving, as set out in AS 28.35.040 and .045, are not subject to the definitions of recklessness and criminal negligence established in the revised criminal code. Rather, each of the offenses includes its own definitions.
[115]*115Alaska Statute 28.35.0408 establishes the offense of reckless driving, prohibiting a person from driving “in a manner which creates a substantial and unjustifiable risk of harm to a person or property.” The statute goes on to provide:
A substantial and unjustifiable risk is a risk of such a nature and degree that the conscious disregard of it or a failure to perceive it constitutes a gross deviation from the standard of conduct that a reasonable person would observe in the situation.
AS 28.35.040(a).
This definition is virtually identical in scope to the combined conduct encompassed by the definitions of recklessness and criminal negligence that are set out in the revised criminal code. Compare AS 28.35.040(a) with AS 11.81.900(a)(3) and (4). In substance, this definition is also indistinguishable from the concept of “culpable negligence” that was passed upon by the supreme court in Lupro. See Bailey v. Lenord, 625 P.2d 849, 856 (Alaska 1981). Thus, the definition of recklessness in AS 28.35.040(a) changes nothing. Its similarity to the definitions contained in the past and current criminal codes serves only to underscore the validity of the basic conclusion reached in Lupro, Edgmon, and St. John: that a person who drives while under the influence of alcohol is guilty of reckless driving.
In comparison, Alaska’s negligent driving statute, AS 28.35.045,9 may be satisfied by proof of an “unjustifiable risk of harm," as opposed to the “substantial and unjustifiable” risk required for reckless driving. The definition of an “unjustifiable risk” is essentially the same definition that applies to cases of ordinary civil negligence:
An unjustifiable risk is a risk of such a nature and degree that a failure to avoid it constitutes a deviation from the standard of care that a reasonable person would observe in the situation.
AS 28.35.045(a). In addition to requiring proof of negligence, however, the negligent driving statute requires proof of another element: that a person or property was actually endangered by the conduct of the accused. For purposes of this requirement, endangerment of a person or property includes the defendant and the defendant’s property. Id.
In context, the reason for inclusion of an actual endangerment requirement in the negligent driving provision is obvious: be[116]*116cause the statutory definition of negligence incorporates the same standard of ordinary care used in cases of civil negligence, the added requirement of actual endangerment is necessary to protect against the possibility that a prosecution for negligent driving —a relatively serious infraction — might be based merely upon commission of some less serious traffic offense. Without the actual endangerment requirement, for example, a driver who exceeded the speed limit by five miles per hour on an empty stretch of highway would be subject to prosecution and conviction for negligent driving.10
Although the dissenting opinion attempts to engraft the “actual endangerment” requirement of the negligent driving statute onto the reckless driving provision that precedes it, the attempt is strained and cannot withstand scrutiny. While inclusion of the actual endangerment requirement in the negligent driving statute is dictated by that statute’s reliance on the civil standard of ordinary care, no similar rationale justifies tacking a parallel requirement onto the reckless driving provision. To do so would be senseless. And in fact the legislature did not do so. Alaska’s reckless driving prohibition is set out in a separate statutory provision from the negligent driving statute, and its clear and unambiguous language omits all reference to the need for proof of actual endangerment. The trial court did not construe the reckless driving provision to include an added requirement of actual endangerment, and the state has never suggested such a novel interpretation.11
As justification for reading into the reckless driving statute a requirement which is plainly not there, the dissenting opinion points to the language of the negligent driving statute that expressly makes negligent driving a lesser-included offense of reckless driving. AS 28.35.045(b) provides:
The offense of negligent driving is a lesser offense than, and included in, the offense of reckless driving, and a person charged with reckless driving may be convicted of the lesser offense of negligent driving.
The dissent reasons that, unless the actual endangerment requirement is read into the reckless driving statute, negligent driving would not be a true lesser-included offense of reckless driving. And so, the dissent decides that the extra requirement must be added to the reckless driving statute. See dissenting opinion, footnote 6.
This reasoning is a case of the tail wagging the dog. The legislature’s apparent reason for including express lesser-included offense language in the negligent driving statute was precisely that this language was necessary because the statute, as written, was not a true lesser-included offense of the reckless driving statute. Although Alaska’s criminal and motor vehicle codes establish a myriad of true greater offense/lesser-included offense combinations, we are aware of no other instance in which the legislature has chosen to include a comparable provision expressly designating one offense as a lesser-included offense of [117]*117another. This is a telling indication of the legislature’s recognition that express lesser-included offense language is simply unnecessary when one offense is a true lesser-included offense of another. The legislature could easily have included an express actual endangerment requirement in the reckless driving statute had it wanted one. The fact that it did not further serves to establish that the lesser-included offense language in the negligent driving statute was motivated by the legislature’s desire to specify a lesser-included offense where one would otherwise not have existed.12
In summary, we conclude that, under the cognate approach, reckless driving and negligent driving were lesser-included offenses of DWI in the present case. Because the issue of Comeau’s intoxication was in dispute, and because the state presented evidence from which the jury could have found Comeau guilty of reckless driving or negligent driving even if it acquitted him of DWI, the trial court erred in refusing Comeau’s request for an instruction on these lesser-included offenses.13
The conviction is REVERSED.