LARSON, Justice.
David Simmons was found guilty of violating a Panora, Iowa, curfew ordinance which restricted the rights of children under eighteen to be in public places between ten o’clock p.m. and five o’clock a.m. The penalty imposed was small — a $1 fine plus surcharge and costs — but potential constitutional issues prompted us to grant discretionary review. We conclude that the ordinance is not unconstitutional on any of the grounds raised and therefore affirm.
The facts are undisputed. At 10:35 p.m., David Simmons, then fifteen, and a friend were skateboarding in a Panora shopping center. A police officer issued them citations for violating a Panora juvenile curfew ordinance which provided:
2.1-1.0301 CURFEW. A curfew applicable to minors is established and shall be enforced as follows:
1. Definition. The term “minor” shall mean, in this section, any un-emancipated person below the age of eighteen (18) years.
2. Time limits. It is unlawful for any minor to be or remain upon any of the alleys, streets or public places or places of business and amusement in the city between the hours of ten (10) o’clock p.m. and five (5) o’clock a.m. of the following day.
3. Exceptions. The- restriction provided by subsection 2.1-1.0301[2] shall not apply to any minor who is accompanied by a guardian, parent or other person charged with the care and custody of such minor, or other responsible person over eighteen (18) years of age, nor shall the restriction apply to any minor who is traveling between his home or place of residence and the place where any approved place of employment, church, municipal or school function is being held.
4. Responsibility of Adults. It is unlawful for any parent, guardian or other person charged with the care and custody of any minor to allow or permit such minor to be in or upon any of the streets, alleys, places of business, or amusement or other public places within the curfew hours set by subsection 2.1 — 1.0301[2], except as otherwise provided in subsection 2.1-1.0301[3].
5. Responsibility of Business Establishments. It is unlawful for any person, firm or corporation operating a place of business or amusement to allow or permit any minor to be in or upon any place of business or amusement operated by them within the curfew hours set by subsection 2.1-1.-0301[2], except as otherwise provided in subsection 2.1-1.0301[3].
6. Enforcement. Any peace officer of this city while on duty is hereby empowered to arrest any minor who violates any of the provisions of Subsections 2.1-1.0301[2 & 3], Upon arrest, the minor shall be returned to the custody of the parent, guardian or other person charged with the care and custody of the minor.
No criminal sanctions are provided by the ordinance, only a requirement that the police return the child to a parent or other responsible adult. Although a “fine” was imposed, apparently without authority under the ordinance, Simmons does not complain about that.
[365]*365In the trial before the magistrate, neither Simmons nor the City was represented by an attorney. Simmons was assisted by his father, and the chief of police acted as both prosecutor and chief witness for the City.
At the magistrate trial, Simmons filed a motion to dismiss, raising some, but not all, of the constitutional objections now urged by him. The magistrate declined to rule on the motion to dismiss, stating that'this was a matter to be ruled on by the district judge in the event Simmons was found guilty.
Simmons was found guilty, and he appealed. On the appeal to a district judge, Simmons was again assisted only, by his father, although the City was represented at that point by its attorney. In the district court appeal, Siinmons’ father reminded the judge that the motion to dismiss filed in the magistrate proceeding was still unresolved and asked for a ruling. The motion to dismiss was overruled by the district judge, and Simmons’ conviction was affirmed. When Simmons expressed an interest in seeking discretionary review of the case, an attorney was appointed to represent him at public expense. The discretionary review was granted; and at this point, several additional constitutional objections to the ordinance were raised by Simmons’ attorneys.
The motion to dismiss in district court, both before the magistrate and the district judge, raised several constitutional issues but did not raise many of the issues frequently confronting courts in curfew cases, including equal protection, overbreadth, and interference with first amendment rights. Simmons attacked the ordinance only on the grounds of vagueness, unconstitutional interference with parenting rights, and unconstitutional interference with Simmons’ rights of “gathering, walking or loitering,” and our consideration of the ordinance is limited accordingly. Contrary to the assertions of the dissent, the first amendment was not mentioned in the motion to dismiss. The right to “gather, walk, or loiter” asserted by Simmons was not claimed in the context of speech or association, such as would be found in a protest march or similar form of “travel.” We address in order the issues raised on appeal as to which error was preserved in the district court.1
I. Vagueness.
Simmons argues that the ordinance is too vague to pass constitutional muster.
It is a basic principle of due process that an enactment is void for vagueness if its prohibitions are not clearly defined. Vague laws offend several important values. First, because we assume that man is free to steer between lawful and unlawful conduct, we insist that laws give the person of ordinary intelligence a reasonable opportunity to know what is prohibited, so that he may act accordingly. Vague laws may trap the innocent by not providing fair warning. Second, if arbitrary and discriminatory enforcement is to be prevented, laws must provide explicit standards for those who apply them. A vague law impermissibly delegates basic policy matters to policemen, judges, and juries for resolution on an ad hoc and subjective basis, with the attendant dangers of arbitrary and discriminatory application. Third, but related, where a vague statute “abut[s] upon sensitive areas, óf basic First Amendment freedoms,” it “operates to inhibit the exercise of [those] freedoms.” Uncertain meanings inevitably lead citizens to “ ‘steer far wider of the unlawful zone’ ... than if the boundaries of the forbidden areas were clearly marked.”
Grayned v. City of Rockford, 408 U.S. 104, 108-09, 92 S.Ct. 2294, 2298-99, 33 L.Ed.2d 222, 227-28 (1972) (footnotes omitted).
In incorporating these notions of fair notice and specific guidance for law enforcement officers, a two-part test has been [366]*366adopted: the statute or ordinance must (1) give a person of ordinary intelligence fair notice of what is prohibited; and (2) provide an explicit standard for officers enforcing it. Kolender v. Lawson, 461 U.S. 352, 357, 103 S.Ct. 1855, 1858, 75 L.Ed.2d 903, 909 (1983); State v. Duncan, 414 N.W.2d 91, 96 (Iowa 1987); Saadiq v. State, 387 N.W.2d 315, 321 (Iowa 1986).
The City asserts that Simmons lacks standing to challenge the ordinance on vagueness grounds. If a statute does not reach a “substantial amount of constitutionally protected conduct” and is not im-permissibly vague in all its applications, a party lacks standing to challenge the statute on vagueness grounds. Hoffman Estates v. Flipside, Hoffman Estates, 455 U.S. 489, 494-95, 102 S.Ct. 1186, 1191, 71 L.Ed.2d 362, 369 (1982).
As one writer has noted,
where the [alleged] vice is vagueness, the litigant asserting the vagueness defense must demonstrate that the statute in question is vague either in all possible applications or at least as applied to the litigant’s conduct, and not simply as applied to some others.
L. Tribe, American Constitutional Law § 12-32, at 1036 (2d ed. 1988).
Simmons’ vagueness attacks in district court were directed only at sections 4, 5, and 6. Sections 4 and 5 prohibit the acts of certain adults and “business establishments,” respectively, which allow violations of the ordinance by minors. Simmons, who does not fall in either of those categories, could not be prosecuted under these sections and therefore lacks standing to complain of any vagueness in them.
Section 6 provides that a minor charged with violating the ordinance is to be returned to the minor’s “parent, guardian or other person charged with the care and custody of the minor.” Simmons complains that the phrase “other person charged with the care and custody of the minor” is vague, but in his case, he was simply ordered by the officer to go home; there is no question about whether the person to whom he was “returned” was a qualified person under the ordinance. Simmons has therefore not been affected by application of this section. In addition, section 6 is only an “after-the-fact” enforcement provision; it has no notice-giving function for purposes of a vagueness analysis.
On Simmons’ appeal to this court, the main thrust of his vagueness argument is directed at section 3 which provides for the exceptions to the curfew. He claims that an “approved” place of employment, church, municipal or school function is too indefinite to be enforceable. The ordinance does not define the word “approved” nor does it specify who is to give such approval. The ordinance also provides that traveling to and from such activities is excepted, but the ordinance does not define “traveling.” Simmons poses the question whether this means the traveling must be by vehicle or also includes walking. Also, the ordinance provides an exception for a minor who is accompanied by certain persons including parents, guardians, and “other responsible person[s],” but it does not define a “responsible person” other than to require that the person be over eighteen. The effect of these uncertainties, he claims, is to require a minor to guess at the meaning of the ordinance and would permit law enforcement officers to “speculate subjectively” as to what is forbidden.
The problem with Simmons’ vagueness argument as to section 3 is that he did not raise it in district court. He asserted in his motion to dismiss only that section 3 violated article I, section 8 of the Iowa Constitution which deals with security of persons in their homes, a theory that he has not pursued on appeal. We conclude that Simmons did not have standing to raise vagueness arguments as to sections 5 and 6, and as to those provisions of section 3 to which he could claim standing, he failed to raise it. We therefore reject his vagueness arguments.
II. The Minor’s Right to Travel About the City.
Simmons argues that paragraph 2 of the ordinance is unconstitutional because “it [367]*367prohibits people from gathering, walking or loitering in public places” in the City. The City responds that these are not “fundamental” rights of minors and that the ordinance is constitutional if there is a rational basis underlying it.
Whether the Panora curfew ordinance implicates Simmons’ fundamental rights is a key question. If a fundamental right is infringed, the level of judicial scrutiny is raised from a rational relationship test to one of strict scrutiny. In that case, the statute will survive a constitutional challenge only if it is shown that the statute is narrowly drawn to serve a compelling state interest. Roe v. Wade, 410 U.S. 113, 155, 93 S.Ct. 705, 728, 35 L.Ed.2d 147, 178 (1973) (citing Kramer v. Union Free School Dist., 395 U.S. 621, 627, 89 S.Ct. 1886, 1889-90, 23 L.Ed.2d 583, 589-90 (1969); Shapiro v. Thompson, 394 U.S. 618, 634, 89 S.Ct. 1322, 1331, 22 L.Ed.2d 600, 615 (1969), and others).
The City suggests that the purpose underlying the ordinance is to help stem the tide of juvenile vandalism, crime and drug usage, and this ordinance, which provides as its only sanction the return of the child home, is a reasonable response.
Interstate travel is classified as a “fundamental right” for substantive due process and equal protection purposes, Attorney Gen. of New York v. Soto-Lopez, 476 U.S. 898, 901-04, 106 S.Ct. 2317, 2320, 90 L.Ed.2d 899, 904-06 (1986); Memorial Hosp. v. Maricopa County, 415 U.S. 250, 254, 94 S.Ct. 1076, 1080, 39 L.Ed.2d 306, 312 (1974). The exact source of the fundamental right of interstate travel is said to be uncertain, but it is probably based on the commerce clause or the privilege and immunities provisions of the United States Constitution. L. Tribe, American Constitutional Law § 16-8, at 1455 n. 3 (2d ed. 1988). Travel which is not interstate is, of course, not specifically mentioned in the constitution, and its status as a fundamental right has been debated. Compare Waters v. Barry, 711 F.Supp. 1125 (D.C.1989); Allen v. City of Bordentown, 216 N.J.Super. 557, 524 A.2d 478 (1987), with Bykofsky v. Borough of Middletown, 401 F.Supp. 1242 (M.D.Pa.1975), aff'd, 535 F.2d 1245 (3d Cir.), cert. denied, 429 U.S. 964, 97 S.Ct. 394, 50 L.Ed.2d 333 (1976); People in Interest of J.M., 768 P.2d 219 (Colo.1989).
The notion that a person’s right to merely wander and stroll about town, as well as to travel interstate, is a fundamental right that appears to have its roots in the case of Papachristou v. City of Jacksonville, 405 U.S. 156, 92 S.Ct. 839, 31 L.Ed.2d 110 (1972), in which Justice Douglas stated that “wandering and strolling,” while
not mentioned in the Constitution or in the Bill of Rights ... [are] unwritten amenities [which] have been in part responsible for giving our people the feeling of independence and self-confidence, the feeling of creativity. These amenities have dignified the right of dissent and have honored the right to be nonconformists and the right to defy submissiveness. . They have encouraged lives of high spirits rather than hushed, suffocating silence.
Papachristou, 405 U.S. at 164, 92 S.Ct. at 844, 31 L.Ed.2d at 117.
Regardless of the nature of the right to travel about town, the Supreme Court has made it clear that minors’ activities and conduct on the street may be regulated and restricted to a greater extent than those of adults. In Prince v. Massachusetts, 321 U.S. 158, 168-69, 64 S.Ct. 438, 443, 88 L.Ed. 645, 653-54 (1944), the Court stated that
[t]he state’s authority over children’s activities is broader than over like actions of adults. This is peculiarly true of public activities and in matters of employment. A democratic society rests, for its continuance, upon the healthy, well-rounded growth of young peoplé into full maturity as citizens, with all that implies. It may secure this against impeding restraints and dangers within a broad range of selection. Among evils most appropriate for such action are the crippling effects of child employment, more especially in public places, and the possible harms arising from other activities subject to all the diverse influences of the street. It is too late now to doubt that legislation appropriately de[368]*368signed to reach such evils is within the state’s police power, whether against the parent’s claim to control of the child or one that religious scruples dictate contrary action.
It is true children have rights, in common with older people, in the primary use of highways. But even in such use streets afford dangers for them not affecting adults. And in other uses, whether in work or in other things, this difference may be magnified. This is so not only when children are unaccompanied but certainly to some extent when they are with their parents. What may be wholly permissible for adults therefore may not be so for children, either with or without their parents’ presence.
(Emphasis added) (footnotes omitted).
In Bellotti v. Baird, 443 U.S. 622, 99 S.Ct. 3035, 61 L.Ed.2d 797 (1979), the Supreme Court considered the question of differential treatment of minors in determining the constitutionality of statutes. Bellotti noted that, in certain cases such as those involving the deprivation of liberty or property, the constitutional protections to be accorded minors are virtually coextensive with those of adults. Bellotti, 443 U.S. at 634, 99 S.Ct. at 3043, 61 L.Ed.2d at 807. In other areas, minors require special protection, and statutes may constitutionally reflect society’s concern for three factors: (1) minors’ peculiar vulnerability, (2) their inability to make sound judgments about their own conduct, and (3) courts’ deference to the “guiding role of parents.” Id. at 635-38, 99 S.Ct. at 3043-46, 61 L.Ed.2d at 808-10.
In applying Bellotti, the Colorado Supreme Court said in a recent case:
We believe that a child’s liberty interest in being on the streets after 10:00 o’clock at night is not co-extensive with that of an adult. The three factors enumerated in Bellotti are all present in this case. Youths abroad at night are more vulnerable to crime and peer pressure than their adult counterparts. Similarly, a child’s immaturity may lead to a decision to commit delinquent acts, such as vandalism, drug or alcohol use, or crimes of violence. Although adults may also make these decisions, they are more likely to do so in an informed and mature manner with full consideration of the consequences of their acts. Courts have recognized that, during the formative years of childhood and adolescence, minors often lack the experience, perspective, and judgment to recognize and avoid choices that could be detrimental to them. Finally, controlling a minor’s freedom of movement after 10:00 p.m. reinforces parental authority and encourages parents to take an active role in supervising their children. In light of these considerations, we conclude that [the minor’s] liberty interest in freedom of movement does not constitute a fundamental right.
People in Interest of J.M., 768 P.2d at 223 (citation omitted).
The Bykofsky court also held that a juvenile’s liberty interest in moving about should be analyzed under a rational relationship test for the purposes of a substantive due process challenge. It stated that
[t]o determine whether the curfew ordinance is a reasonable exercise of the Borough’s police power and thus constitutional, the court must balance the minor’s constitutional right to freedom of movement and his concomitant constitutionally protected interest to be upon and use the public streets during the nighttime hours under circumstances other than those provided for in the curfew exceptions against the aforementioned governmental interests advanced by the ordinance.
The interest of minors in being abroad during the nighttime hours included in the curfew is not nearly so important to the social, economic, and healthful well-being of the community as the free movement of adults. Moreover, the ordinance contains numerous exceptions that allow minors to be on the streets during the curfew hours when they have a specific, important, legitimate purpose for being there or if they are accompanied by a parent....
[369]*369Bykofsky, 401 F.Supp. at 1256 (emphasis added) (citations omitted); accord City of Milwaukee v. K.F., 145 Wis.2d 24, 426 N.W.2d 329, 340 (1988).
We agree with these authorities that a minor’s right of intracity travel is not a fundamental right for due process purposes, and the ordinance need not meet a strict scrutiny test. Rather, we need to determine only whether there is a rational relationship between the goals of the ordinance and the means chosen. We believe there is. In weighing the minor’s interest in intracity travel against the City’s interest in providing a prophylactic solution to the perceived problems inherent in unrestricted minor travel, we believe that the ordinance is a reasonable exercise of the City’s power to legislate for the good of its citizens.
In reaching a contrary result, we believe the federal district court in Waters erred in its application of the Bellotti rationale. Waters found that the “peculiar vulnerability” of children was not a sufficient reason for establishing a juvenile curfew law, stating that “it is obvious that the plague afflicting the District^ including drugs and crime,] poses no peculiar danger to children.” Waters, 711 F.Supp. at 1137. Our court has said that “[c]ourts should at least know what everyone else knows,” Stenberg v. Buckley, 245 Iowa 622, 627, 61 N.W.2d 452, 455 (1954), and it is common knowledge that drug usage among minors has reached epidemic dimensions.
The United States Supreme Court in a recent case recognized this and upheld a city ordinance which prohibited intermingling of minors with adults in dance establishments. In doing so, the Court cited Bellotti and noted the peculiar vulnerability of youngsters to drug usage and sexual contact. City of Dallas v. Stanglin, 490 U.S. -, -, 109 S.Ct. 1591, 1595-96, 104 L.Ed.2d 18, 26-27 (1989) (applying rational-basis test).
In summary, we believe the ordinance in question is a legitimate exercise of Pano-ra’s powers designed to protect the safety and welfare of its children and any restrictions on a minor’s intracity travel is not significant enough to create a constitutional problem.
III. Effect on Parents’ Rights.
Simmons also argues that the curfew unconstitutionally interferes with his parents’ right to raise him and, therefore, unduly intrudes upon family autonomy. See Wisconsin v. Yoder, 406 U.S. 205, 232-33, 92 S.Ct. 1526, 1541-42, 32 L.Ed.2d 15, 34-35 (1972). The parents are not parties to this case, however, and the basis for Simmons’ standing to challenge an interference with parenting rights is not clear. We do not believe there is merit in the argument in any event. •
The City argues that, while a right to family autonomy exists, such rights are subject to the same limitations as other constitutionally protected rights and that minors are subject to reasonable regulations imposed by legislative authorities. The United States Supreme Court has stated that
[t]he State commonly protects its youth from adverse governmental action and from their own immaturity by requiring parental consent to or involvement in important decisions by minors....
... Thus, “[i]t is cardinal with us that the custody, care and nurture of the child reside first in the parents, whose primary function and freedom include preparation for obligations the state can neither supply nor hinder.”
Bellotti, 443 U.S. at 637-38, 99 S.Ct. at 3045, 61 L.Ed.2d at 809-10 (1979) (footnotes omitted) (quoting Prince v. Massachusetts, 321 U.S. 158, 166, 64 S.Ct. 438, 442, 88 L.Ed. 645, 652 (1944)).
While parents have the primary role in child-rearing, “[w]hen actions concerning the child have a relation to the public welfare or the well-being of the child, the state may act to promote these legitimate interests.” Bykofsky, 401 F.Supp. at 1262. Under parens patriae, the state may restrict the parent’s control by requiring school attendance, regulating or prohibiting the child’s labor, and in many other ways. Prince, 321 U.S. at 166, 64 S.Ct. at 442, 88 L.Ed. at 652. “In cases in which [370]*370harm to the physical or mental health of the child or to the public safety, peace, order, or welfare is demonstrated, these legitimate state interests may override the parents’ qualified right to control the upbringing of their children.” Bykofsky, 401 F.Supp. at 1264.
In the present case, the City has a strong interest in protecting minors from the national epidemic of drugs, and the curfew ordinance is a minimal infringement upon a parent’s right to bring up his or her child. In effect, the Panora curfew ordinance acts to make parents the primary agent of enforcement. In addition, it could be said “to promote family life by encouraging children to be at home.” Note, Curfew Ordinances and the Control of Nocturnal Juvenile Crime, 107 U.Penn.L.Rev. 66, 67 (1958). As the Bykofsky court stated:
The ordinance does not dictate to the parent an over-all plan of discipline for the minor. With its numerous exceptions, including the one that permits the juvenile to be on the streets during the curfew hours if accompanied by a parent, the ordinance constitutes a minimal interference with the parental interest in influencing and controlling the activities of their offspring.
Bykofsky, 401 F.Supp. at 1264.
It is difficult, when judging Panora’s ordinance, to determine if it forces parents to abdicate their authority over their children, or to accept such authority. In either case, the City’s interference is minimal and its interest significant.
In summary, we conclude that the ordinance is not unconstitutional on any of the grounds urged and, therefore, affirm the district court.
AFFIRMED.
All Justices concur except LAVORATO, SCHULTZ, CARTER, and NEUMAN, JJ., who dissent.