United States Court of Appeals
                         For the Eighth Circuit
                     ___________________________

                             No. 15-2703
                     ___________________________

             Gary Hughes; Arash Yarpezeshkan; David Mazgaj

                   lllllllllllllllllllll Plaintiffs - Appellants

                             Edward G. Robinson

                           lllllllllllllllllllll Plaintiff

                    James Louis Sparks; Jerry Northrup

                   lllllllllllllllllllll Plaintiffs - Appellants

                              Daniel Ray French

                           lllllllllllllllllllll Plaintiff

Jeffrey V. Stimpson; Roger L. Lee; Krisanne M. Duhaime; Gerald R. Duhaime;
                            Susan M. Dumbaugh

                   lllllllllllllllllllll Plaintiffs - Appellants

                                         v.

               City of Cedar Rapids, Iowa; Gatso USA, Inc.

                   lllllllllllllllllllll Defendants - Appellees
                                    ____________

                  Appeal from United States District Court
              for the Northern District of Iowa - Cedar Rapids
                               ____________
                           Submitted: September 20, 2016
                             Filed: November 2, 2016
                                  ____________

Before LOKEN, BEAM, and BENTON, Circuit Judges.
                           ____________

BENTON, Circuit Judge

       A group of drivers sued the City of Cedar Rapids and Gatso USA, Inc., arguing
that the Automatic Traffic Enforcement (ATE) system violates federal and state law.
The district court dismissed the drivers’ claims. Having jurisdiction under 28 U.S.C.
§ 1291, this court affirms in part, reverses in part, and remands.

                                          I.

      In 2011, the City, by ordinance, authorized an ATE system. Cedar Rapids,
Iowa Mun. Code § 61.138. The City contracted with Gatso to install and operate
the system. When a vehicle speeds or runs a red light, an ATE camera takes an
image. Gatso then mails a Notice of Violation to the vehicle owner. The drivers sued
in Iowa state court, arguing that the ATE system violates their right to procedural due
process, their fundamental right to travel, Iowa Code § 602.6101, and causes unjust
enrichment for the City and Gatso. They removed the case to federal court and
moved to dismiss.

      The district court dismissed for lack of Article III standing: Gary Hughes and
David L. Mazgaj’s claims, and the procedural-due-process claims of Edward G.
Robinson, James L. Sparks, Jeffrey L. Northrup, Arash C. Yarpezeshkan, Daniel R.
French, and Jeffrey V. Stimpson. For the drivers with standing, the district court
dismissed for failure to state a claim. On appeal, the drivers contend that the district
court erred by dismissing their complaint and not remanding to state court those
claims dismissed for lack of standing.

                                          -2-
                                          II.

      According to the City and Gatso, drivers Hughes, Mazgaj, and Roger L. Lee
lack Article III standing for their claims. This court reviews standing determinations
de novo. Plymouth Cty., Iowa v. Merscorp, Inc., 

, 1158-59 (8th Cir.
2014).

       Article III of the Constitution limits the jurisdiction of federal courts to cases
and controversies. U.S. Const. art. III, § 2. To establish Article III standing, a
plaintiff must show 1) an injury in fact, 2) a sufficient causal connection between the
injury and the conduct complained of, and 3) a likelihood that the injury will be
redressed by a favorable decision. Lujan v. Defenders of Wildlife, 

, 560
(1992). The party invoking federal jurisdiction has the burden to establish these
elements. 

City and Gatso object to Hughes’s Article III standing, claiming he has no
injury in fact. Hughes asserts a “fear that, as a Vehicle Owner regularly using the
roads in Cedar Rapids, [he] may be subject to . . . civil liability resulting from the
operation of the City’s fixed or mobile ATE system’s cameras.” He has not received
a Notice of Violation. A person threatened with law enforcement may challenge the
law “under circumstances that render the threatened enforcement sufficiently
imminent.” Susan B. Anthony List v. Driehaus, 

, 2342 (2014). The
person need not demonstrate it is “literally certain that the harms they identify will
come about.” Clapper v. Amnesty Int’l. USA, 

, 1150 n.5 (2013).
Standing may be based on a “substantial risk” of harm that prompts plaintiffs to
“reasonably incur costs to mitigate or avoid that harm.” 

does not allege that he has incurred any costs to mitigate or avoid the
threat of ATE enforcement, or that the threat of an ATE citation is sufficiently
imminent. Hughes does not have standing.

                                          B.

       The City and Gatso claim Mazgaj has no injury in fact. His wife received the
Notice of Violation, but Mazgaj was driving the car (which she owned). He asserts
third-party standing on behalf of his wife. “[T]here may be circumstances where it
is necessary to grant a third-party standing to assert the rights of another.” Kowalski
v. Tesmer, 

, 129-30 (2004). For example, a plaintiff may show “a close
relationship with the person who possesses the right” and “a hindrance to the
possessor’s ability to protect [her] own interests.” 

       Mazgaj fails to show a hindrance to his wife’s ability to protect her own
interests. He does not have third-party standing. Mazgaj believes he need not assert
third-party standing. But then his claim is just a “generally available grievance . . .
seeking relief that no more directly and tangibly benefits him than it does the public
at large.” Hollingsworth v. Perry, 

, 2662 (2013). Mazgaj does not
state an Article III case or controversy.

                                          C.

       According to the City and Gatso, Lee’s claims are not ripe for adjudication.
“[T]he ripeness inquiry requires the examination of both ‘the fitness of the issues for
judicial decision and the hardship to the parties of withholding court consideration.’”
Pub. Water Supply Dist. No. 10 v. City of Peculiar, 

, 572-73 (8th Cir.
2003), quoting Abbott Labs v. Gardner, 

, 148 (1967). Fitness depends
on whether a case needs further factual development. 

that the
plaintiff “has sustained or is immediately in danger of sustaining some direct injury

                                         -4-
as the result of the challenged statute or official conduct.” 

“must
necessarily satisfy both prongs to at least a minimal degree.” Neb. Pub. Power Dist.
v. MidAmerican Energy Co., 

, 1039 (8th Cir. 2000).

       Lee satisfies both prongs. He was found guilty of violating the ordinance; no
further factual development is necessary. Lee has the hardship of citation and the
cost of litigation. Lee’s claims are ripe.

                                          D.

       Hughes and Mazgaj reason that if they lack Article III standing, the district
court must remand their claims to state court. See 28 U.S.C. § 1447(c) (“If at any
time before final judgment it appears that the district court lacks subject matter
jurisdiction, the case shall be remanded.”). The City and Gatso counter that the
district court exercised supplemental jurisdiction and properly dismissed the claims
for lack of Article III standing.

       A court may not exercise supplemental jurisdiction over a claim if the claimant
lacks Article III standing. DaimlerChrysler Corp. v. Cuno, 

, 351-52
(2006) (“What we have never done is . . . permit a federal court to exercise
supplemental jurisdiction over a claim that does not itself satisfy those elements of
the Article III inquiry, such as constitutional standing . . . .”). If a case is removed
from state court, those claims lacking Article III standing shall be remanded. See
Shaw v. Marriot Int’l, Inc., 

, 1044 (D.C. Cir. 2010) (remanding some
claims where after removal, some plaintiffs, but not all, lacked standing); Lee v.
American Nat’l Ins. Co., 

, 1006 (9th Cir. 2001) (same).

      Wisconsin Department of Corrections v. Schacht, 

(1998), is
inapplicable here. There, plaintiff argued that if the “district court lacks subject
matter jurisdiction over any claim, then every claim, i.e., the entire case, must be

                                          -5-
remanded to the state court.” 

(emphasis in original). The Court disagreed,
holding that remand of an entire case was improper where the court had jurisdiction
over some related claims. 

drivers do not argue that every claim in the
case should be remanded; they seek remand of only those claims that lack Article III
standing.

       The district court never had jurisdiction of Hughes and Mazgaj’s claims. See

. Their claims should be remanded to state
court. See Wallace v. ConAgra Foods, Inc., 

, 1032 (8th Cir. 2014)
(finding that where a state case is removed to federal court but lacks Article III
standing, the proper remedy is remand to state court).

                                          III.

                                           A.

       The district court found that drivers Robinson, Sparks, Northrup,
Yarpezeshkan, French, and Stimpson lack standing to bring a procedural-due-process
claim, because they chose not to participate in the process they attack. The district
court invoked Shavitz v. City of High Point, 

, 711 (M.D.N.C.
2003): where the plaintiff has not “availed himself of the process Defendants have
provided, Plaintiff has not suffered a concrete and particularized injury as a result of
allegedly deficient process and therefore has no standing to challenge it.”

        Unfortunately, Shavitz confuses the injury-in-fact requirement with the stating-
a-valid-claim requirement. Determining the adequacy of the process is generally a
merits question, even if a plaintiff does not use the process provided. See Cochran
v. Illinois State Highway Auth., 

, 600-01 (7th Cir. 2016) (addressing,
at the merits stage, the argument “the hearing to which [plaintiff] was entitled, but did
not request, would not have provided him with a meaningful opportunity to be

                                          -6-
heard.”). See also Sevin v. Parish of Jefferson, 

, 599 (E.D. La
2008) (“[T]his Court would be remiss if it incorporated an assessment of the
adequacy of . . . adjudication procedures, or the plaintiff’s failure to take advantage
of those procedures, into its standing analysis.”). Otherwise, in order to have
standing, a plaintiff would always have to show the inadequacy of the due
process—the central claim.

       The district court here addressed the substance of the due process argument as
part of the standing analysis. The allegations that the procedure is inadequate—even
if drivers shun it—sufficiently establishes an injury in fact for Article III standing.

      These six drivers also satisfy the causation and redressability requirements.
The drivers’ alleged injury is inadequate process directly traceable to the City and
Gatso. If the court awards damages, their claims are redressed. See Friends of the
Earth, Inc. v. Laidlaw Envtl. Servs., Inc., 

, 174 (2000). Drivers
Robinson, Sparks, Northrup, Yarpezeshkan, French, and Stimpson have standing to
bring procedural-due-process claims.

                                            B.

      To demonstrate a procedural-due-process violation, the drivers must show a
deprivation of life, liberty, or property without sufficient process. Clark v. Kansas
City Mo. Sch. Dist., 

, 701 (8th Cir. 2004). To determine the kind of
process due, courts balance three factors:

      1) the nature and weight of the private interest affected by the
      challenged official action; 2) the risk of an erroneous deprivation
      of such interest as a result of the summary procedures used; and
      3) the governmental function involved and state interests served
      by such procedures, as well as the administrative and fiscal
      burdens, if any, that would result from the substitute procedures
      sought.

                                          -7-
Booker v. City of Saint Paul, 

, 734 (8th Cir. 2014), citing Mathews v.
Eldridge, 

, 334 (1976). This court reviews de novo the grant of a
motion to dismiss for failure to state a claim, taking all facts in the complaint as true.
Sparkman Learning Ctr. v. Ark. Dept. of Human Servs., 

, 997 (8th Cir.
2014).

       The drivers’ claim fails at the second factor, “the risk of an erroneous
deprivation . . . as a result of the summary procedures used.” 

. The drivers attack the administrative process as a “rubber stamp” and a “sham
of a process.” A court need not accept conclusory allegations. See Ashcroft v. Iqbal,

(2009) (holding that a pleading is insufficient if it contains mere labels
and conclusions or tenders naked assertions devoid of further factual enhancement).
See also Hughes v. City of Cedar Rapids, 

, 847-48 (N.D. Iowa.
2015) (noting the two ways, plus appeals, to challenge an ATE citation).

        The drivers also allege that the process is inadequate because some cameras are
not calibrated to Iowa Department of Transportation (IDOT) standards. The drivers
claim that the IDOT standards are “a standard applicable to their claims.” The drivers
cite no authority that a state agency’s regulations are the standard for procedural due
process. See Williams v. Nix, 

(8th Cir. 1993) (“It is clear, however, that,
without more, the mere violation of a state law or rule does not constitute a federal
due process violation.”). The district court correctly ruled that “the ATE Program
may comply with procedural due process even if it is not compliant with IDOT
regulations.” The drivers do not state a violation of their procedural-due-process
rights.

                                          IV.

      The drivers next focus on substantive due process. “To establish a substantive
due process violation, [plaintiff] must demonstrate that a fundamental right was

                                           -8-
violated and that the conduct shocks the conscience.” Akins v. Epperly, 

, 1183 (8th Cir. 2009), citing Moran v. Clarke, 

, 651 (8th Cir.
2002) (Bye, J., concurring).
                                       A.

       The right to travel is a fundamental right. United States v. Guest, 

, 757 (1966). It has three different components: 1) the right of a citizen of one
state to enter and leave another state, 2) the right to be a welcome visitor, not an
unfriendly alien, when temporarily present in another state, and 3) for those travelers
who become permanent residents, the right to be treated like other citizens of that
state. Sanez v. Roe, 

, 500-01 (1999). The first two components are at
issue here.

                                          1.

       The first component protects the “right to go from one place to another.” 

If a statute does not burden entry into or exit from the state, then it does not
directly impair the right to free interstate movement. 

v. California,

(1941) (holding unconstitutional a state law making it illegal for a
person to bring out-of-state, indigent persons into the state). The right to travel does
not prevent toll roads, speed limits, or travel-related taxes. See Matsuo v. United
States, 

, 1183 (9th Cir. 2009) (“[N]ot everything that deters travel
burdens the fundamental right to travel. States and the federal government would
otherwise find it quite hard to tax airports, hotels, moving companies, or anything else
involved in interstate movement.”).

        The drivers allege that the ATE system infringes their right to travel because
it is a “speed trap” affecting the choices of interstate travelers. A state may enforce
conventional traffic regulations—even if they deter travel—without violating the


                                          -9-
fundamental right to travel. See Lutz v. City of York, 

, 270 n.41 (3d Cir.
1990).1

                                            2.

       The Privileges and Immunities Clause is the basis for the second component
of the right to travel, “bar[ring] discrimination against citizens of other States where
there is no substantial reason for the discrimination beyond the mere fact that they are
citizens of other States.” 

. “[A] purely intrastate restriction
does not implicate the right of interstate travel, even if it is applied intentionally
against travelers from other States, unless it is applied discriminatorily against them.”
Bray v. Alexandria Women’s Health Clinic, 

, 277 (1993) (emphasis in
original). For the Clause to apply, the discriminatory treatment must burden out-of-
state residents. United Bldg. & Constr. Trades Council v. Mayor & Council of
Camden, 

, 218 (1984) (“As an initial matter, the court must decide
whether the ordinance burdens one of those privileges and immunities protected by
the Clause.”).

      The drivers fail to allege discriminatory enforcement against out-of-state
drivers. They state that the ATE system issues more citations to out-of-state drivers
than to in-state drivers. However, they do not allege that the ATE system issues


      1
        The drivers assert they have a right to intrastate travel under the Iowa
Constitution. They cite no Iowa law supporting this claim. Cf. Scheckel v. State, 

, 

, *2 (Iowa Ct. App. 2013) (unpublished table
opinion) (stating that “the right to travel does not give an individual the right to travel
at their discretion with disregard to the traffic laws”); State v. Hartog, 

, 856 (Iowa 1989) (holding mandatory seat belt law did not infringe upon a
fundamental right); Veach v. Iowa Dep’t of Transp., 

, 249 (Iowa
1985) (holding that a regulation denying work permits to individuals whose drivers’
licenses had been suspended did not implicate a fundamental right).

                                           -10-
citations discriminatorily based on whether a vehicle has in-state or out-of-state
registration. See 

. The drivers note that the ATE system allows
out-of-state residents to contest, by mail, a Notice of Violation. This convenience for
non-residents does not burden the right to travel. See United 

.
The drivers do not allege a violation of the right to travel under the Privileges and
Immunities Clause.

        The drivers do try to state a violation of substantive due process, claiming that
the challenged conduct shocks the conscience. See 

. To the
contrary, the City and Gatso’s acts are not “so disproportionate to the need presented,
and . . . so inspired by malice or sadism rather than a merely careless or unwise excess
of zeal that it amounted to brutal and inhumane abuse of official power literally
shocking to the conscience.” Christiansen v. W. Branch Cmty. Sch. Dist., 

, 937 (8th Cir. 2012). The City and Gatso’s actions do not otherwise offend
judicial notions of fairness.

                                          B.

       The drivers posit an Equal Protection Clause violation of their fundamental
right to travel. “[E]qual protection analysis requires strict scrutiny of a legislative
classification only when the classification impermissibly interferes with the exercise
of a fundamental right or operates to the peculiar disadvantage of a suspect class.”
Mass. Bd. of Ret. v. Murgia, 

, 312 (1976). The drivers admit that they
are not members of a suspect class, and as discussed, the ordinance does not burden
their fundamental right to travel. When no fundamental right or suspect class is at
issue, a challenged law must pass the rational basis test. Reno v. Flores, 

, 301 (1993).

       The drivers attack the rational basis of the ordinance. In rational basis review,
“legislative choice is not subject to courtroom fact-finding and may be based on

                                          -11-
rational speculation unsupported by evidence or empirical data.” FCC v. Beach
Commc’ns, Inc., 

, 313 (1993). “It is enough that there is an evil at hand
for correction, and that it might be thought that the particular legislative measure was
a rational way to correct it.” Williamson v. Lee Optical, 

, 487-88,
(1955).

       The ordinance passes rational basis. The City could rationally conclude that
the ATE system would reduce the number of people violating traffic laws. See Idris
v. City of Chicago, 

, 566 (7th Cir. 2009) (A “system that simultaneously
raises money and improves compliance with traffic laws has much to recommend and
it cannot be called unconstitutionally whimsical”); 

-
43 (rejecting an equal-protection challenge to distinctions based on licence-plate
location and types of vehicles in the database). There is no Equal Protection Clause
violation here.

                                          C.

       The drivers emphasize pending state-court litigation about the ATE system.
In March 2015, IDOT ruled that some traffic cameras in the City should be removed.
IDOT found that some cameras were “beyond the area of concern” or placed too close
to a speed-reduction sign. Evaluation of Cedar Rapids Automated Traffic Enf’t
Report, Iowa Dep't of Transp., (2015) available at http://www.iowadot.gov/
ATEReports/pdfs/Final%20Cedar%20Rapids%20ATE%20Response.pdf. The
City’s appeal is still pending in Iowa state court. City of Muscatine v. Iowa Dep’t of
Trans., 05771 CVCV049988 (Polk Cty. Dist. Ct. filed June 10, 2015).

       According to the drivers, IDOT’s ruling shows that the ordinance does not
have a rational basis. Even if the ordinance did violate IDOT regulations, a “violation
of state law does not by itself constitute a violation of the Federal Constitution.”


                                         -12-
Nordlinger v. Hahn, 

, 25 (1992). The district court properly determined
that the ordinance would survive rational basis even if it did violate IDOT rules.

       The drivers allege that the violation of IDOT rules demonstrates a claim under
the Iowa Constitution. Because the City’s appeal of the IDOT’s ruling is still
pending, this claim is not ripe. See Missourians for Fiscal Accountability v. Klahr,
No. 15-2172, 

(8th Cir. July 29, 2016) (explaining that ripeness
prevents “judicial interference until an administrative decision has been formalized
and its effects felt in a concrete way by the challenging parties”) (citation omitted).
The status of the IDOT ruling is central to a claim based on it. The district court
should dismiss without prejudice the drivers’ state-law claims based on the alleged
violation of IDOT rules. See 

(dismissing without prejudice
plaintiffs’ state law claim that a Chicago ATE ordinance is in conflict with a state
statute).

                                           V.

       The drivers believe the City and Gatso have been unjustly enriched. An unjust
enrichment claim requires: “(1) defendant was enriched by the receipt of a benefit;
(2) the enrichment was at the expense of the plaintiff; and (3) it is unjust to allow the
defendant to retain the benefit under the circumstances.” State ex rel. Palmer v.
Unisys Corp., 

, 154-55 (Iowa 2001). The drivers think that Gatso
was unjustly enriched by an unlawful delegation of police power from the City. The
drivers’ only authority, Spurbeck v. Statton, 

, 665-66 (Iowa 1960),
is inapposite because the statute there did not improperly delegate police power. A
municipality “can . . . delegate its right to perform certain acts and duties necessary
to transact and carry out its powers. These delegable acts typically involve functions
that require little judgment or discretion.” Warren Cty. Bd. of Health v. Warren Cty.
Bd. of Supervisors, 

, 913-14 (Iowa 2002). Subject to later
development of the law, the Iowa Supreme Court has allowed ATE systems to operate

                                          -13-
with private contractors, thus implicitly rejecting the delegation challenge. See City
of Sioux City v. Jacobsma, 

, 337 (Iowa 2015) (allowing Sioux City
to operate an ATE system with a private contract). Cf. City of Davenport v.
Seymour, 

, 544 (Iowa 2008) (recognizing that “a number of statutory
and constitutional questions have been raised to ATE ordinances that are not
presented in this appeal,” including whether they “improperly delegat[e] government
authority to a private vendor.”).

      The drivers also argue that the ordinance violates Iowa Code § 602.6101, again
as an improper delegation of police power, by making Gatso a court.2 Section
602.6101 establishes the jurisdiction of the Iowa District Court as “exclusive,
general, and original jurisdiction of all actions . . . except in cases where exclusive
or concurrent jurisdiction is conferred upon some other court, tribunal, or
administrative body.” The drivers’ argument fails for the same reason as their claim
for unjust enrichment; there is no improper delegation (or in statutory terms,
conferral) of power upon Gatso. See 

. Cf. 

.

                                          VI.

       The drivers object that the district court considered matters outside of the
pleadings, effectively converting a motion to dismiss into a motion for summary
judgment. Fed. R. Civ. P. 12(d) (“If, on a motion under Rule 12(b)(6) or 12(c),
matters outside the pleadings are presented to and not excluded by the court, the
motion must be treated as one for summary judgment under Rule 56.”). District
courts may consider “those materials that are necessarily embraced by the pleadings.”
Schriener v. Quicken Loans, Inc., 

, 444 (8th Cir. 2014). Those
materials include “documents whose contents are alleged in a complaint and whose

      2
          The drivers did not plead a violation of Iowa Code § 364.22.

                                         -14-
authenticity no party questions, but which are not physically attached to the
pleadings.” Kushner v. Beverly Enters., Inc., 

(8th Cir. 2003). Courts
may look outside the pleadings to determine jurisdiction. See Osborn v. United
States, 

, 728 n.4 (8th Cir. 1990).

        The drivers list three items outside the pleadings: 1) checks and payment
receipts for the drivers’ various citations, 2) a letter from a City police officer
dismissing Susan M. Dumbaugh’s citation, and 3) a certified statement from a City
police captain verifying drivers’ citation documents. The drivers do not dispute that
the first two items were used to resolve jurisdictional questions, which means that the
district court could consider them. See 

n.4. As for the third
item, the district court did not rely on the certified statement.

       According to the drivers, the district court made some findings that rejected
their allegations or failed to draw all reasonable inferences in their favor. First, while
the district court did find that the City (not Gatso) mails the Notices of Violation, the
drivers do not articulate the materiality of this mistake. Cont’l Holdings, Inc. v.
Crown Holdings Inc., 

, 575 (8th Cir. 2012) (“A district court’s ruling
should be reversed if the error affects the substantial rights of a party.”). Second,
contrary to the drivers’ view, the district court properly found that the ordinance
provides two ways to contest the Notice of Violation—a legal conclusion based on
the plain text of the ordinance.

                                     ********

      The judgment is affirmed in part and reversed in part. Hughes and Mazgaj’s
claims are remanded for remand to state court. The drivers’ state law claims based
on IDOT standards are remanded for dismissal without prejudice. The judgment is
otherwise affirmed, and the case remanded.
                         ______________________________

                                          -15-