Opinion by Judge T.G. NELSON; Dissent by Judge W.D. BROWNING
T.G. NELSON, Circuit Judge:
The Cabazon Band of Mission Indians (the “Tribe”) appeals the district court’s order granting summary judgment to ap-pellees, officials of the Riverside County, California, Sheriffs Department (the “Sheriff’), in the Tribe’s suit challenging the application of certain provisions of the California Vehicle Code to tribal police vehicles traveling on public highways located off the reservation. We affirm.
I.
The essential facts of this case are undisputed. The Cabazon Indian Reservation is located in Southern California. The Tribe has a Public Safety Department which provides law enforcement services on the reservation. Armed and uniformed Cabazon public safety officers drive dark blue vehicles marked on the sides and the rear with the words “Tribal Law Enforcement” and with the name “Cabazon” marked on the sides.
The reservation consists of three non-contiguous parcels of land. Because of physical and geographical barriers, it is not possible to drive between the different parcels without leaving the reservation. Consequently, the Public Safety Department’s vehicles must drive on sections of public highways located off the reservation in order to provide law enforcement services to the entire reservation.
Prior to the instant conflict, the public safety vehicles had emergency light bars affixed to their roofs. However, various provisions of the California Vehicle Code limit the use or display of emergency light bars to “authorized emergency vehicles” performing emergency services.2 Moreover, only such “authorized emergency vehicles” are exempt from certain traffic safety regulations when responding to an emergency.3 On several occasions before the commencement of this suit, the Sheriff stopped Cabazon public safety officers driving their official vehicles on public highways located off the reservation and cited the officers for displaying emergency light bars, on the ground that the tribal vehicles were not “authorized emergency vehicles” within the meaning of the code.4 To avoid further conflict, the Tribe’s Director of Public Safety ordered the light bars removed. However, the director maintains that operating the public safety vehicles without light bars, or with covered light bars, threatens the safety of his officers and compromises their ability to perform their duties.
The Tribe and its Director of Public Safety, in his official capacity, filed suit in the United States District Court seeking declaratory and injunctive relief against appellees individually and in their capacities as officials of the Riverside County Sheriffs Department. Plaintiffs argued, in the words of the district court, that “Cabazon Public Safety Department vehicles should be treated like those of other law enforcement agencies operating in California.”5 The Tribe sought, inter alia, a declaration that the sections'of the Califor[1104]*1104nia Vehicle Code regulating the use of emergency light bars were preempted by the Tribe’s sovereign authority to establish and operate a police department to enforce the criminal law on reservation lands and an injunction preventing the Sheriff from interfering with tribal public safety vehicles displaying emergency light bars when they travel between these noncontiguous parcels of reservation land.
The district court found, and the parties do not dispute, that the Cabazon Public Safety Department police vehicles do not fit within California’s definition of “authorized emergency vehicles,” contained in Section 165 of the Vehicle Code. The court also found that the “state interests in regulating the operation of emergency vehicles are sufficient to overcome whatever interference with tribal [law] enforcement efforts has been caused by precluding the use of light bars,” and, as a result, the “general federal policy of supporting tribal law enforcement efforts does not preempt valid state regulation of off-reservation activities in this situation.”6 Finally, it also found that application of the state’s vehicle code in this situation did not constitute “an undue or excessive burden on the Tribe’s ability to perform effectively its on-reservation law enforcement functions.”7 As a result, the court denied the Tribe’s motion for summary judgment on its claims and entered judgment for the Sheriff. That decision is the subject of the present appeal.8
II.
The district court’s order granting or denying summary judgment is reviewed de novo.9 Summary judgment is appropriate where “there is no genuine issue as to any material fact” and “the moving party is entitled to a judgment as a matter of law.”10
III.
It may be helpful to begin our discussion of the law applicable to this complex area with a brief statement of what this case does not involve. We are not here dealing with an assertion of state law over Indians who undertake activity on an Indian reservation.11 Nor is this a case where the state seeks to reach non-Indians who undertake activity on an Indian reservation.12 Rather, this case involves the issue of whether a state may enforce its vehicle [1105]*1105code against tribal police vehicles when they travel on public highways located off the reservation.
The principle governing resolution of this case was announced in Mescalero Apache Tribe v. Jones (Mescalero I ).13 In that case, the Supreme Court stated that “[a]bsent express federal law to the contrary, Indians going beyond reservation boundaries have generally been held subject to non-discriminatory state law otherwise applicable to all citizens of the State.” 14 The Court then applied this principle to uphold New Mexico’s rights to collect a nondiscriminatory gross receipts tax from a ski resort owned and operated by the tribe but located off-reservation.15 In doing so, the Court reasoned that because “tribal activities conducted outside the reservation present different considerations [than those on the reservation],” the “[s]tate’s authority over Indians is yet more extensive over activities ... not on any reservation.”16 Furthermore, the Mescalero I Court concluded that this principle was not limited to the facts or particular context of the case before it.17
The Tribe’s claim that sections of the California Vehicle Code regulating the use of emergency light bars are preempted by the Tribe’s sovereign authority to establish and operate a police department ignores this principle governing a state’s regulatory authority over tribal activities off-reservation. The Tribe does not claim that a specific federal law expressly provides for the preemption of the vehicle code provisions at issue here; instead, it merely points to a number of federal laws that purportedly demonstrate a general federal policy of promoting tribal self-sufficiency and encouraging tribal law enforcement efforts.
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Opinion by Judge T.G. NELSON; Dissent by Judge W.D. BROWNING
T.G. NELSON, Circuit Judge:
The Cabazon Band of Mission Indians (the “Tribe”) appeals the district court’s order granting summary judgment to ap-pellees, officials of the Riverside County, California, Sheriffs Department (the “Sheriff’), in the Tribe’s suit challenging the application of certain provisions of the California Vehicle Code to tribal police vehicles traveling on public highways located off the reservation. We affirm.
I.
The essential facts of this case are undisputed. The Cabazon Indian Reservation is located in Southern California. The Tribe has a Public Safety Department which provides law enforcement services on the reservation. Armed and uniformed Cabazon public safety officers drive dark blue vehicles marked on the sides and the rear with the words “Tribal Law Enforcement” and with the name “Cabazon” marked on the sides.
The reservation consists of three non-contiguous parcels of land. Because of physical and geographical barriers, it is not possible to drive between the different parcels without leaving the reservation. Consequently, the Public Safety Department’s vehicles must drive on sections of public highways located off the reservation in order to provide law enforcement services to the entire reservation.
Prior to the instant conflict, the public safety vehicles had emergency light bars affixed to their roofs. However, various provisions of the California Vehicle Code limit the use or display of emergency light bars to “authorized emergency vehicles” performing emergency services.2 Moreover, only such “authorized emergency vehicles” are exempt from certain traffic safety regulations when responding to an emergency.3 On several occasions before the commencement of this suit, the Sheriff stopped Cabazon public safety officers driving their official vehicles on public highways located off the reservation and cited the officers for displaying emergency light bars, on the ground that the tribal vehicles were not “authorized emergency vehicles” within the meaning of the code.4 To avoid further conflict, the Tribe’s Director of Public Safety ordered the light bars removed. However, the director maintains that operating the public safety vehicles without light bars, or with covered light bars, threatens the safety of his officers and compromises their ability to perform their duties.
The Tribe and its Director of Public Safety, in his official capacity, filed suit in the United States District Court seeking declaratory and injunctive relief against appellees individually and in their capacities as officials of the Riverside County Sheriffs Department. Plaintiffs argued, in the words of the district court, that “Cabazon Public Safety Department vehicles should be treated like those of other law enforcement agencies operating in California.”5 The Tribe sought, inter alia, a declaration that the sections'of the Califor[1104]*1104nia Vehicle Code regulating the use of emergency light bars were preempted by the Tribe’s sovereign authority to establish and operate a police department to enforce the criminal law on reservation lands and an injunction preventing the Sheriff from interfering with tribal public safety vehicles displaying emergency light bars when they travel between these noncontiguous parcels of reservation land.
The district court found, and the parties do not dispute, that the Cabazon Public Safety Department police vehicles do not fit within California’s definition of “authorized emergency vehicles,” contained in Section 165 of the Vehicle Code. The court also found that the “state interests in regulating the operation of emergency vehicles are sufficient to overcome whatever interference with tribal [law] enforcement efforts has been caused by precluding the use of light bars,” and, as a result, the “general federal policy of supporting tribal law enforcement efforts does not preempt valid state regulation of off-reservation activities in this situation.”6 Finally, it also found that application of the state’s vehicle code in this situation did not constitute “an undue or excessive burden on the Tribe’s ability to perform effectively its on-reservation law enforcement functions.”7 As a result, the court denied the Tribe’s motion for summary judgment on its claims and entered judgment for the Sheriff. That decision is the subject of the present appeal.8
II.
The district court’s order granting or denying summary judgment is reviewed de novo.9 Summary judgment is appropriate where “there is no genuine issue as to any material fact” and “the moving party is entitled to a judgment as a matter of law.”10
III.
It may be helpful to begin our discussion of the law applicable to this complex area with a brief statement of what this case does not involve. We are not here dealing with an assertion of state law over Indians who undertake activity on an Indian reservation.11 Nor is this a case where the state seeks to reach non-Indians who undertake activity on an Indian reservation.12 Rather, this case involves the issue of whether a state may enforce its vehicle [1105]*1105code against tribal police vehicles when they travel on public highways located off the reservation.
The principle governing resolution of this case was announced in Mescalero Apache Tribe v. Jones (Mescalero I ).13 In that case, the Supreme Court stated that “[a]bsent express federal law to the contrary, Indians going beyond reservation boundaries have generally been held subject to non-discriminatory state law otherwise applicable to all citizens of the State.” 14 The Court then applied this principle to uphold New Mexico’s rights to collect a nondiscriminatory gross receipts tax from a ski resort owned and operated by the tribe but located off-reservation.15 In doing so, the Court reasoned that because “tribal activities conducted outside the reservation present different considerations [than those on the reservation],” the “[s]tate’s authority over Indians is yet more extensive over activities ... not on any reservation.”16 Furthermore, the Mescalero I Court concluded that this principle was not limited to the facts or particular context of the case before it.17
The Tribe’s claim that sections of the California Vehicle Code regulating the use of emergency light bars are preempted by the Tribe’s sovereign authority to establish and operate a police department ignores this principle governing a state’s regulatory authority over tribal activities off-reservation. The Tribe does not claim that a specific federal law expressly provides for the preemption of the vehicle code provisions at issue here; instead, it merely points to a number of federal laws that purportedly demonstrate a general federal policy of promoting tribal self-sufficiency and encouraging tribal law enforcement efforts. Thus, because there is no “express federal law to the contrary,” and because it is undisputed that California’s Vehicle Code is “non-discriminatory state law otherwise applicable to all citizens of the State,” the challenged code sections apply to the Tribe’s police vehicles when they travel on public highways located off the reservation.
The district court did not rely on Mescalero I, but instead invoked the Court’s decision in White Mountain Apache Tribe v. Bracker18 for the proposition that “[t]he extent of tribal sovereignty ... clearly involves more than simple geographical limits, but includes the ‘tradition of Indian sovereignty over the reservation and tribal members.’”19 In White Mountain, the Court undertook a particularized inquiry into the nature of the state, federal, and tribal interests at stake and held that Arizona’s application of its motor carrier license and use fuel taxes to a non-Indian logging company’s operation on-reservation was preempted by federal law.20 Consistent with White Mountain’s [1106]*1106instruction, the district court weighed the competing interests in this case and concluded that the state’s interest in regulating the operation of emergency vehicles sufficiently outweighed the federal and tribal interests at stake such that the sections of the California Vehicle Code regulating the use of emergency light bars were not preempted as applied to the Tribe.
However, White Mountain’s preemption analysis is not applicable to off-reservation activity.21 White Mountain involved only the on-reservation activity of a non-Indian company.22 In fact, the White Mountain Court expressly recognized the dichotomy between a state’s authority to enforce otherwise nondiscriminatory state law off and on-reservation, stating that “[i]n the case of Indians going beyond reservation boundaries, ... a nondiscriminatory state law is generally applicable in the absence of express federal law to the contrary.”23
The dissent suggests that the White Mountain Court intended for its preemption analysis to apply more generally, as “when difficult questions arise concerning the interplay between State law, tribal sovereignty and federal policy concerning self-[1107]*1107governance of the tribes.” However, that proposition is mistakenly derived from the following statement in White Mountain:
When on-reservation conduct involving only Indians is at issue, state law is generally inapplicable, for the State’s regulatory interest is likely to be minimal and the federal interest in encouraging. tribal self-government is at its strongest. More difficult questions arise where, as here, a State asserts authority over the conduct of non-Indians engaging in activity on the reservation. In such cases we have .... [conducted] a particularized inquiry into the nature of the state, federal, and tribal interests at stake.... 24
This passage clearly indicates that the White Mountain Court was only addressing the “difficult question” of applying state law to the on-reservation activity of non-Indians when it announced its now famous preemption analysis. In light of this passage and the White Mountain Court’s recognition of the dichotomy between a state’s authority to enforce otherwise nondiscriminatory state law off and on-reservation, there is simply no basis for concluding that White Mountain’s preemption analysis can apply to off-reservation activity.
Moreover, Supreme Court authority interpreting White Mountain makes clear that White Mountain’s preemption analysis-along with its concern for sovereignty factors-does not apply when the issue is whether state law applies off-reservation. In New Mexico v. Mescalero Apache Tribe (Mescalero II), the state’s application of its hunting and fishing laws to nonmembers of the tribe on the reservation was preempted by operation of federal law.25 The Court stated:
In [White Mountain Apache Tribe v.] Bracker, we reviewed our prior decisions concerning tribal and State authority over Indian reservations and extracted certain principles governing the determination whether federal law preempts the assertion of State authority over nonmembers on a reservation. We stated that that determination does not depend “on mechanical or absolute conceptions of state or tribal sovereignty, but calls for a particularized inquiry into the nature of the state, federal, and tribal interests at stake.”26
The Mescalero II Court went on to note that, in White Mountain, it “emphasized the special sense in which the doctrine of preemption is applied in this context”27 and that “[b]y resting preemption- analysis principally on a consideration of the nature of the competing interests at stake, our cases .... have rejected the proposition that preemption requires ‘an express congressional statement to that effect.’”28 However, at the same time, the Mescalero II Court noted that “[o]ur cases have recognized that tribal sovereignty contains a ‘significant geographical component,’”29 and, as a result, “the off-reservation activities of Indians are generally subject to the prescriptions of a ‘nondiscriminatory state law’ in the absence of ‘express federal law to the contrary.’ ’.’30 This statement, ap[1108]*1108pearing after the Court rejected the requirement for an “express congressional statement” when applying White Mountain’s preemption analysis, confirms that White Mountain’s preemption analysis does not apply when the issue is whether state law applies off-reservation.31
Salt River Pima-Maricopa Indian Cmty. v. Yavapai County32 buttresses this conclusion. In that case, we applied Mes-calero I to uphold Arizona’s imposition of its property tax on a tribe’s commercial property located off the reservation.33 In doing so, we did not discuss any sovereignty considerations, nor did we undertake a particularized inquiry into the nature of the state, federal, and tribal interests at stake; instead, we only addressed whether imposition of the tax was discriminatory.34
The Tribe’s reliance on Kiowa Tribe of Oklahoma v. Manufacturing Technologies, Inc.35 is misplaced. Kiowa Tribe concerned whether a tribe’s sovereign immunity barred a civil suit against the tribe in state court, where the activity giving rise to the suit occurred off the reservation.36 In holding that immunity did bar the suit, the Supreme Court clearly indicated that its decision did not erode the principle that generally applicable laws apply to Indians off-reservation.37 The Court explained; “To say substantive state laws apply to off-reservation conduct, however, is not to say that a tribe no longer enjoys immunity from suit.... There is a difference between the right to demand compliance with state laws and the means available to enforce them.”38
For its part, the Government, as amicus, points to our decision in In re Blue Lake Forest Products, Inc.39 as support for the position that this case is not governed by Mescalero I, but rather must be decided under White Mountain’s preemption analysis. Blue Lake involved a dispute between a tribe and a bank over the proceeds of the tribe’s sale to Blue Lake, a non-Indian commercial company located off the reservation, of logs harvested from tribal lands. Blue Lake gave the bank a security interest in its after-acquired property, failed to pay for the logs, and went [1109]*1109bankrupt. The bankruptcy court authorized Blue Lake to process and sell the logs and then deposit the proceeds with the bank. The tribe claimed the proceeds under a federal statute which specified that title to Indian timber held in trust by the United States cannot pass until the buyer first pays for it, and the bank claimed the proceeds under state commercial law.40 We concluded that the relevant tribal activity occurred on-reservation:
Even though this case implicates an off-reservation relationship between two non-Indian actors (Blue Lake and the bank), we deem it an on-reservation case for purposes of preemption because the essential conduct at issue occurred on the reservation: the severance of timber and its removal without proper compensation, in contravention of the governing contract and federal regulations. Furthermore, the Indian enterprise at the heart of this dispute-the timbering lands-is located on, not off, the reservation.41
Contrary to the Government’s argument, Blue Lake does not stand for the proposition that, in certain limited instances, tribal activities occurring off-reservation may be deemed to occur on-reservation for purposes of applying White Mountain’s preemption analysis. Blue Lake merely stands for the proposition that, when determining whether to apply White Mountain’s preemption analysis, a court should focus on the location of the tribal activity which gave rise to the dispute over application of state law, even if that dispute also involves an off-reservation relationship between non-Indian actors. Here, unlike in Blue Lake, the Tribe’s activity that gave rise to this dispute over application of certain sections of the California Vehicle Code occurred off-reservation. Thus, nothing in Blue Lake requires us to reach a different result here.
Finally, the dissent argues that even if we apply the principle announced in Mes-calero I, the sections of the California Vehicle Code regulating the use of emergency light bars could not be applied to the Tribe’s police vehicles because doing so would discriminate against the Tribe. It cites our decision in Salt River Pimar-Maricopa Indian Community, which held that Arizona’s tax on a tribe’s commercial property located off the reservation was not discriminatory because the tribe was “similarly situated” with Arizona’s sister states whose property in Arizona was not exempt from taxation.42 According to the dissent, because law enforcement vehicles from border states can operate inside California within 50 miles of the border, light bars intact,43 the Tribe must also be permitted to display emergency light bars when it drives its police vehicles on public highways between its three noncontiguous parcels of land.
In Salt River, we applied the well-established rule that “[a] tax is discriminatory if it is not imposed equally upon similarly situated groups.”44 In doing so, we could not have intended to make the “similarly situated” rule applicable in every case which requires us to decide whether a tribe is “subject to non-discriminatory [1110]*1110state law otherwise applicable to all citizens of the State.”45 The “similarly situated” rule is not appropriate in all such cases, and it is certainly not appropriate in this case, where it is undisputed that the challenged vehicle code sections apply, with limited exceptions, to all individuals and entities within California.46
That California permits law enforcement vehicles from its sister states to drive on its highways while displaying emergency light bars does not make enforcement of these code sections against the Tribe discriminatory. “[Tjribal reservations are not States,”47 and the decision whether to grant the Tribe the same status as these other states rests with the legislature. While there may be policy arguments in favor of permitting the Tribe to display emergency light bars when it drives its police vehicles on public highways between its three noncontiguous parcels of land, it is inappropriate for us to substitute our judgment for that of the state’s elected representatives.48 We simply cannot accept the argument that exceptions to a law of general applicability automatically make that law discriminatory when applied to someone else.
IV.
Supreme Court authority instructs that the principle governing the instant case is as follows: “Absent express federal law to the contrary, Indians going beyond reservation boundaries [are] generally ... subject to non-discriminatory state law otherwise applicable to all citizens of the State.”49 Here, because there is no “express federal law to the contrary,” and because it is undisputed that California’s Vehicle Code is “non-discriminatory state law otherwise applicable to all citizens of the State,” the challenged code sections apply to the Tribe’s police vehicles when they travel on public highways located off the reservation.
AFFIRMED.