delivered the opinion of the court:
The State brings this direct appeal pursuant to Rule 302(a) (107 Ill. 2d R. 302(a)) from a judgment of the circuit court of Will County which held unconstitutional sections 6 — 204(a)(1) and 6 — 205(b)(2) of the Illinois Vehicle Code (the Code) (Ill. Rev. Stat. 1987, ch. 951/2, pars. 6 — 204(a)(1), 6 — 205(b)(2)). These sections provide that upon conviction of certain sex offenses, the offender’s driver’s license is subject to mandatory revocation. The *177issue on appeal is whether the cited statutory provisions violate defendant’s right to due process of law.
BACKGROUND
On September 22, 1987, defendant pleaded guilty and was convicted of one count of criminal sexual assault and two counts of aggravated criminal sexual abuse. (Ill. Rev. Stat. 1985, ch. 38, par. 12 — 13(a)(3); Ill. Rev. Stat. 1985, ch. 38, par. 12 — 16(b).) The victims were defendant’s two stepdaughters, who were both under the age of 18 years when the acts were committed.
On November 12, 1987, after a hearing, the court sentenced defendant to 36 months’ probation, subject to various conditions. After the sentence was imposed, defendant moved the court to refuse to forward defendant’s driver’s license and the reports of his convictions to the Secretary of State for mandatory revocation as required by the challenged statutory provisions. In support of his motion, defendant contended, among other things, that the application of the statute deprived him of life, liberty or property without due process of law. In this court, defendant submits the same contention and further contends that the statute violates the separation of powers provision of the Illinois Constitution (Ill. Const. 1970, art. II, §1).
In an order entered November 30, 1987, the trial court ruled that section 6 — 204(aXl) of the Code, in conjunction with section 6 — 205(bX2) of the Code, denies the defendant due process of law in violation of the Illinois and United States Constitutions. Accordingly, the court held these provisions to be invalid. It is undisputed, and the court specifically found, that a motor vehicle was not involved in the commission of the offenses for which defendant was convicted. Having found the statute to be unconstitutional, the court did not require the defendant to surrender his license.
*178OPINION
Legislative enactments carry a strong presumption of constitutionality, and the party challenging the statute has the burden of clearly establishing its invalidity. (People v. Inghram (1987), 118 Ill. 2d 140, 146.) For the reasons set forth below, we conclude that defendant in this case has sustained his burden.
We begin our analysis by setting out the relevant statutory provisions. Section 6 — 204(a)(1) of the Code provides as follows:
“When Court to forward License and Reports, (a) For the purpose of providing to the Secretary of State the records essential to the performance of the Secretary’s duties under this Code to revoke or suspend the driver’s license and privilege to drive motor vehicles of persons found guilty of the criminal offenses or traffic violations which this Code recognizes as evidence relating to unfitness to safely operate motor vehicles, the following duties are imposed upon public officials:
1. Whenever any person is convicted of any offense for which this Code makes mandatory the revocation of the driver’s license or permit of such person by the Secretary of State, the judge of the court in which such conviction is had shall require the surrender to the clerk of the court of all driver’s licenses or permits then held by the person so convicted, and the clerk of the court shall, within 10 days thereafter, forward the same, together with a report of such conviction, to the Secretary.” Ill. Rev. Stat. 1987, ch. 95%, par. 6 — 204(a)(1).
Section 6 — 205(b)(2) of the Code provides that conviction of certain sex offenses will result in mandatory revocation of the offender’s license. That section provides as follows:
“(b) The Secretary of State shall also forthwith revoke the license or permit of any driver in the following situations:
*1792. Of any driver, upon receiving notice from the clerk of the court of the conviction of such driver for the commission of any of the following sex offenses: criminal sexual assault, aggravated criminal sexual assault, criminal sexual abuse, aggravated criminal sexual abuse, juvenile pimping, soliciting for a juvenile prostitute and the manufacture, sale or delivery of controlled substances or instruments used for illegal drug use or abuse.” (Ill. Rev. Stat. 1987, ch. 95W, par. 6-205(b)(2).)
Similar provisions have been in effect since 1961. See Ill. Rev. Stat. 1961, ch. 95V2, par. 6 — 205(d).
We initially determine the applicable standard of review. It is clear from the decisions of this court that the rational-basis test applies in this case. A driver’s license is a property interest for purposes of the due process clause. (People v. Orth (1988), 124 Ill. 2d 326, 334; People v. Esposito (1988), 121 Ill. 2d 491, 504.) The interest in a driver’s license, while important, is not fundamental in the constitutional sense. Orth, 124 Ill. 2d at 335; see also Koss v. Slater (1987), 116 Ill. 2d 389, 397 (difficulties arising from suspension of driver’s license — inability to drive to work, to obtain food, clothing and medical attention — are inconveniences, not the curtailment of fundamental rights).
It is well established that where, as here, the statute under consideration does not affect a fundamental constitutional right, the appropriate standard of review is the rational-basis test. (Bernier v. Burris (1986), 113 Ill. 2d 219, 228-29, citing Williamson v. Lee Optical of Oklahoma, Inc. (1955), 348 U.S. 483, 488, 99 L. Ed. 563, 572, 75 S. Ct. 461, 464; Harris v. Manor Healthcare Corp. (1986), 111 Ill. 2d 350, 367-68.) We note that, unlike decisions addressing summary suspension provisions of the Code (e.g., Orth, 124 Ill. 2d 326; Esposito, 121 Ill. 2d 491), the case before us does not implicate procedural due process rights. Defendant here is not complaining *180about lack of notice and a hearing. Rather, he contends that the statute violates due process because it is an unreasonable and arbitrary exercise of the State’s police power. See People v. Wick (1985), 107 Ill. 2d 62, 63.
Under the rational-basis test, a “ ‘legislative enactment must bear a reasonable relationship to the public interest intended to be protected, and the means adopted must be a reasonable method of accomplishing the desired objective.’ ” (Wick, 107 Ill. 2d at 65-66, quoting Illinois Gamefowl Breeders Association v. Block (1979), 75 Ill. 2d 443, 453; see also Harris, 111 Ill. 2d at 368 (statute will be upheld if it bears a rational relationship to a legitimate legislative purpose and is neither arbitrary nor discriminatory, citing Illinois Gamefowl Breeders, 75 Ill. 2d at 453).) In applying this test, we identify the public interest that the statute is intended to protect, examine whether the statute bears a reasonable relationship to that interest, and determine whether the method used to protect or further that interest is reasonable. Wick, 107 Ill. 2d at 66.
The principal point of contention between the parties is the first step in the analysis: identifying the public interest the statute is intended to protect — in other words, the purpose of the statute. Defendant contends, relying on section 6 — 204(a) of the Code, set out above, that the purpose of the statute is the safe operation of motor vehicles, and since the legislature has stated its purpose in that section, we may consider no other. The State contends that because we must uphold the statute if there is any conceivable basis for finding a rational relationship (see Harris, 111 Ill. 2d at 368), we must consider purposes other than that stated in section 6 — 204(a). The State appears to concede that if safety is the only purpose of the statute, the challenged provision bears no rational relationship to the statute’s purpose and therefore revocation of defendant’s license is unconstitutional. (At *181one point in its brief, the State says that “it will be assumed for this portion of the argument that there is no rational relationship between commission of a sex offense and safe operation,” yet nowhere in its brief does the State argue that such a relationship exists.)
We turn, then, to a consideration of the public interest the statute is intended to protect. It is fundamental that in determining the intent of the legislature, we are to consider “ ‘the statute in its entirety, noting the subject it addresses and the legislature’s apparent objective in enacting it.’ ” (People v. Maya (1985), 105 Ill. 2d 281, 285, quoting Gill v. Miller (1983), 94 Ill. 2d 52, 56.) Thus we consider not only the statement of purpose in section 6 — 204(a) but also the substantive provisions of section 6 — 205. With the exception of section 6 — 205(b)(2), every subsection of sections 6 — 205(a) and (b) has some affinity with a motor vehicle — either the operation or ownership of the vehicle, or the paperwork connected to such operation or ownership. See, e.g., section 6 — 205(aXl) (reckless homicide resulting from operation of motor vehicle); section 6 — 205(a)(2) (driving under the influence of alcohol or drugs); section 6 — 205(a)(7) (automobile theft); section 6 — 205(a)(5) (perjury or making of false affidavit or statement under oath to Secretary of State relating to ownership or operation of motor vehicle).
We find particularly significant section 6 — 205(a)(3), which provides for mandatory revocation upon conviction of any felony under State or Federal law in the commission of which a motor vehicle was used. By this provision, the legislature specified that a person’s license will be revoked upon conviction of a felony if, and only if, a vehicle was used in the commission of that felony. Yet section 6 — 205(b)(2) specifies several offenses, the majority of which are felonies, and provides that these offenses will result in revocation regardless of whether a vehicle was used in their commission. We think section *1826 — 205(a)(3) clearly reflects the legislature’s intent that revocation be tied to offenses involving the use of a motor vehicle. Section 6 — 205(b)(2) is wholly inconsistent with that intent.
As we have said, the legislature’s intent is to be determined from the statute in its entirety, including the subject it addresses. The challenged provision is part of the Illinois Vehicle Code. The Code addresses subjects ranging from vehicle title and registration to financial responsibility; all have some connection to motor vehicles. The stated purpose is to ensure that drivers who have demonstrated they are unfit to safely operate vehicles are not allowed to drive. With the exception of the challenged provision (as well as section 6 — 205(b)(3), which provides for revocation for five years upon conviction of a second sex offense), the enumerated offenses in sections 6 — 204 and 6 — 205 all have some connection to operating or owning a vehicle not only safely, but legally. For these reasons, we conclude that the public interest the statute was intended to protect is the interest in keeping the roads free of two kinds of drivers: those who threaten the safety of others, and those who have abused the privilege to drive by doing so illegally (e.g., by fraudulently obtaining a driver’s license) or by using a vehicle to commit a criminal act. In short, the public interest is the safe and legal operation and ownership of motor vehicles.
Having identified the public interest at stake, we next examine whether the statute bears a reasonable relationship to that interest. We readily conclude that it does not, and as we have noted, the State does not argue otherwise. Because a vehicle was not involved in any way in the commission of the offenses for which defendant was convicted, the revocation of his license bears no relationship, much less a reasonable one, to the public interest *183we have identified. The same is true of the other offenses enumerated in section 6 — 205(b)(2).
Moreover, the method used to further the public interest is not reasonable. Keeping off the roads drivers who have committed offenses not involving vehicles is not a reasonable means of ensuring that the roads are free of drivers who operate vehicles unsafely or illegally. To the contrary, the means chosen are arbitrary, not only because the offenses specified in section 6 — 205(b)(2) have no connection to motor vehicles, but also because the inclusion of those offenses and no others is arbitrary. That is, no reason suggests itself as to why the legislature chose the particular offenses enumerated in section 6 — 205(b)(3), as opposed to other offenses not involving a vehicle.
For these reasons, we hold that the challenged provision is an unreasonable and arbitrary exercise of the State’s police power in violation of the constitutional guarantee of due process and is therefore invalid.
The State contends that under the rational-basis test, we are not limited by the statement of purpose found in the statute and may, indeed must, consider any conceivable basis for the challenged provision. Further, the State argues, in a somewhat circular fashion, as follows. This court’s duty is to construe acts of the legislature so as to affirm their constitutionality and validity, if that can be reasonably done. (E.g., Sayles v. Thompson (1983), 99 Ill. 2d 122, 125.) The State assumes arguendo that revocation of a sex offender’s license is not related to the offender’s fitness to operate a vehicle. Given that assumption, if we determine the statute’s purpose only by reference to its stated purpose, we necessarily will find that the provision is unconstitutional. It follows, according to the State, that we must determine that the statute has purposes other than safety in order to fulfill our duty to uphold its constitutionality.
*184The State’s argument is unpersuasive. In the first place, the rational-basis test, although a deferential standard of review, “ ‘is not a toothless one.’ ” (Mathews v. De Castro (1976), 429 U.S. 181, 185, 50 L. Ed. 2d 389, 394, 97 S. Ct. 431, 434, quoted in Logan v. Zimmerman Brush Co. (1982), 455 U.S. 422, 439, 71 L. Ed. 2d 265, 280, 102 S. Ct. 1148, 1160 (Blackmun, J., concurring).) Second, our duty to uphold the constitutionality of legislative enactments is always subject to the qualification that we must do so if that can be reasonably done. It is no less our duty to strike down legislation that plainly violates the Constitution. Third, we have ascertained the purpose of the statute by considering not only the stated purpose — safe operation — but also the legislation as a whole.
But even if we consider the purposes identified by the State, the statute fails to pass constitutional muster. The first purpose identified by the State is punishment. As a preliminary matter, we will assume arguendo that revocation after conviction constitutes punishment, notwithstanding our decisions which have held that summary suspension of a license before a trial on the merits is an administrative function and not a punishment. People v. Esposito (1988), 121 Ill. 2d 491, 501; Koss v. Slater (1987), 116 Ill. 2d 389, 395.
We fail to see, however, how identifying the purpose as punishment cures the constitutional infirmity. The revocation of defendant’s license would then be an additional penalty for a criminal offense, and the same rational-basis test would apply. (See, e.g., People v. Wick (1985), 107 Ill. 2d 62 (aggravated arson statute, including penalty provision, reviewed under rational-basis test); People v. Wagner (1982), 89 Ill. 2d 308 (same-drug offense statute).) The penalty of license revocation bears no relationship to the offense. Moreover, if punishment is the purpose, the statute is arbitrary for the *185same reason we identified earlier. There is no rational basis for choosing the particular offenses in section 6— 205(b)(2), as opposed to other offenses not involving a vehicle, to receive the punishment of revocation. If the legislature may punish these offenses with revocation, nothing prohibits it from imposing that penalty for violating any provision of the Criminal Code, a result that would be plainly irrational.
The State also argues that deterrence is a legitimate purpose of the challenged provision. If this is the statute’s purpose, it clearly cannot meet the rational-basis test. We will accept the State’s argument that where deterrence is the purpose, it need not be shown that the statute in fact deters anyone. (See Doe v. Edgar (N.D. Ill. 1982), 562 F. Supp. 66, 70, affd (7th Cir. 1983), 721 F.2d 619.) However, the proposition that the legislature might have thought that the loss of driving privileges will deter persons from committing the sex and drug offenses listed in section 6 — 205(b)(2), all but one of which are felonies punishable by imprisonment, is simply not rational.
The State, in a concluding paragraph, mentions several other State interests that might be served by revocation of defendant’s license, such as keeping sex offenders near home where they may be more easily recognized. Despite the fact that the State’s contentions are unsupported by argument or authority and are therefore waived (Brown v. Tenney (1988), 125 Ill. 2d 348, 362; 107 Ill. 2d R. 341(e)(7)), we have considered these contentions and find them to be without merit.
Finally, we note that the General Assembly has recently enacted legislation that is relevant to this appeal. (“An Act in relation to certain controlled substances and cannabis violations” (the Act), Pub. Act 85 — 1259, eff. Jan. 1, 1989.) Section 3 of the Act amends the Illinois Vehicle Code by repealing the provision at issue in this *186case, section 6 — 205(b)(2), and adding a new provision to section 6 — 206, section 6 — 206(a)(29). Under the former legislation, revocation is mandatory upon conviction of any of the enumerated offenses. Under the new legislation, the Secretary of State is granted the discretionary authority to suspend or revoke driving privileges, without a preliminary hearing, upon conviction of any of the same offenses. The Act became effective on January 1, 1989. However, the Act provides, in new section 6— 205(f) of the Code, that any revocation imposed pursuant to section 6 — 205(b)(2) that is in effect on December 31, 1988, shall be converted to a suspension for a like period of time. We have considered these changes to the applicable statute and find they do not affect our disposition of the case.
For the foregoing reasons, we hold that section 6— 205(b)(2) of the Illinois Vehicle Code violates the due process clauses of the Illinois and United States Constitutions and is therefore invalid. Accordingly, the judgment of the circuit court is affirmed. In light of our disposition, we need not address the other contentions made by defendant.
Judgment affirmed.
took no part in the consideration or decision of this case.