RULING ON MOTION FOR PRELIMINARY INJUNCTION
JOSÉ A. CABRANES, District Judge:
The United States seeks a preliminary injunction barring enforcement by the defendant State of Connecticut of its recently enacted statute prohibiting so-called “tandem trailers” on Connecticut highways. In support of its motion, the United States asserts that Connecticut’s statute is preempted by an act of Congress, the Surface Transportation Assistance Act of 1982, 49 U.S.C. § 2301 et seq. In opposition to the United States’ motion, Connecticut argues that there is no conflict between the Federal statute and at least some provisions of the State statute; that the Federal law is unconstitutional; and that regulations promulgated by the Federal Highway Administration pursuant to the Federal statute are illegal.
The court is mindful that this case has aroused public concern and controversy.1 It would, however, be misleading to characterize the constitutional and legal issues as difficult matters. The principles upon which the court must base its decision are as old as the Republic itself and deeply embedded in our history as a nation. For the reasons set forth below, the United States’ motion must be granted.
I.
In 1956, the United States Congress decided to authorize a nationwide system of highways to be constructed by the states but with the assistance of Federal funds. As that system has evolved over the years, different types of federally-funded highways have been established. Most federally-funded highways — including some referred to as the Primary System — have three-quarters of their cost funded by the Federal Government. One particular group of highways — the Interstate System — has ninety per cent of its cost supplied from the Federal fisc.
[573]*573On January 6,1983, Congress enacted the Surface Transportation Assistance Act of 1982 (“STAA”), 49 U.S.C. § 2301 et seq. Section 411(c) of the STAA, 49 U.S.C. § 2311(c), provides that states may not prohibit tandem trailers, defined as single truck tractors with two trailing units, from any part of the Interstate System or from parts of the Primary System designated by the Secretary of Transportation.2
On April 5,1983, the Connecticut General Assembly enacted, and Connecticut Governor William A. O’Neill signed into law, Public Act No. 83-21, “An Act Concerning Tandem Trailer Trucks” (“the Connecticut statute”). Section 2 of the Connecticut statute prohibits tandem trailers from using highways in the State.3 Section 3 of the Connecticut statute sets forth various provisions designed to restrict the use of tandem trailers on highways in the State, in the event that a court of competent jurisdiction enjoins enforcement of Section 24
On May 27, 1983, the United States commenced this case by filing a Complaint, a Motion for Preliminary Injunction, and a Memorandum of Points and Authorities in Support of Motion for Preliminary Injunction. The State of Connecticut filed its Answer on June 6, 1983 and its Memorandum in Opposition to Motion for Preliminary Injunction (“Connecticut Memorandum”) on June 8, 1983. Also on June 8, 1983, the United States filed a Plaintiffs’ Reply Memorandum in Support of Motion for Preliminary Injunction. A separate set of papers was filed by the parties in connection with the United States’ Motion to Pre[574]*574elude Evidence (filed June 3, 1983), which the court denied by ruling filed June 8, 1983. Conferences with counsel were held in chambers (partly on the record) and in open court on May 31, 1983 and June 3, 1983, at which the court considered and acted upon various applications regarding pre-trial proceedings. On June 9, 1983, a day-long evidentiary hearing on the motion for a preliminary injunction was held before the court, at which the State offered the testimony of nine witnesses on safety, legislative and regulatory issues.
II.
Proper consideration of the motion for a preliminary injunction must begin with an understanding of what this case involves. Simply stated, the Congress of the United States enacted a statute, and thereafter the Connecticut General Assembly enacted another statute. The United States asserts that the latter statute conflicts with the former and is, accordingly, pre-empted. The United States also asserts that, even if there were no Federal legislation, the Connecticut statute would work an unconstitutional interference with interstate commerce.
Where Federal and state statutes conflict, the Supremacy Clause of the United States Constitution, Art. VI, provides that the state statute must give way.5 A long history of law has established beyond the slightest doubt that Congress has pre-eminent authority under the Commerce Clause of the Constitution, Art. I, § 8, to legislate where activities affecting interstate commerce are concerned, to pre-empt those state laws in conflict with congressional enactments, and to prohibit state regulations concerning activities having a substantial effect on interstate commerce even in the absence of any contradictory congressional enactments.6
[575]*575In general, the power of Congress to preempt state legislation affecting interstate commerce is sweeping. In the case before this court, it is likely that the Connecticut statute, even in the absence of any congressional pre-emption, might have had an unconstitutional impact on interstate commerce.
Section 411(c) of the STAA specifically provides that no state shall prohibit tandem trailers from its highways. Thus, the STAA reveals an explicit congressional intention to pre-empt competing state legislation. Section 2 of the Connecticut statute, which announces' a ban on tandem trailers in the State, does precisely what Section 411(c) of the STAA provided a state could not do. Section 3 of the Connecticut statute, slated to come into play if enforcement of Section 2 is enjoined, imposes various restrictions and regulations on those who would drive tandem trailers on state highways. Thus, Section 3 burdens the activity that the STAA clearly seeks to protect.7 Hence, Section 3 of the Connecticut statute also appears to be pre-empted.
III.
In defense of its statute, the State of Connecticut has launched an attack that is ingenious and thorough, yet ultimately unavailing. Throughout the State’s case, the argument is made that tandem trailers ought to be banned, one way or another, from Connecticut’s highways.8 This court expresses no view on that question. It is not the function of this court in this case to second-guess a congressional determination.9 Where Congress acts pursuant to its authority under the Constitution and elects to pursue a certain course of action, those who disagree with Congress ordinarily must pursue their cause through political debate [576]*576and action, not through litigation.10 Nothing in the present case presents an occasion for deviation from these settled principles of American constitutional law.
A.
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RULING ON MOTION FOR PRELIMINARY INJUNCTION
JOSÉ A. CABRANES, District Judge:
The United States seeks a preliminary injunction barring enforcement by the defendant State of Connecticut of its recently enacted statute prohibiting so-called “tandem trailers” on Connecticut highways. In support of its motion, the United States asserts that Connecticut’s statute is preempted by an act of Congress, the Surface Transportation Assistance Act of 1982, 49 U.S.C. § 2301 et seq. In opposition to the United States’ motion, Connecticut argues that there is no conflict between the Federal statute and at least some provisions of the State statute; that the Federal law is unconstitutional; and that regulations promulgated by the Federal Highway Administration pursuant to the Federal statute are illegal.
The court is mindful that this case has aroused public concern and controversy.1 It would, however, be misleading to characterize the constitutional and legal issues as difficult matters. The principles upon which the court must base its decision are as old as the Republic itself and deeply embedded in our history as a nation. For the reasons set forth below, the United States’ motion must be granted.
I.
In 1956, the United States Congress decided to authorize a nationwide system of highways to be constructed by the states but with the assistance of Federal funds. As that system has evolved over the years, different types of federally-funded highways have been established. Most federally-funded highways — including some referred to as the Primary System — have three-quarters of their cost funded by the Federal Government. One particular group of highways — the Interstate System — has ninety per cent of its cost supplied from the Federal fisc.
[573]*573On January 6,1983, Congress enacted the Surface Transportation Assistance Act of 1982 (“STAA”), 49 U.S.C. § 2301 et seq. Section 411(c) of the STAA, 49 U.S.C. § 2311(c), provides that states may not prohibit tandem trailers, defined as single truck tractors with two trailing units, from any part of the Interstate System or from parts of the Primary System designated by the Secretary of Transportation.2
On April 5,1983, the Connecticut General Assembly enacted, and Connecticut Governor William A. O’Neill signed into law, Public Act No. 83-21, “An Act Concerning Tandem Trailer Trucks” (“the Connecticut statute”). Section 2 of the Connecticut statute prohibits tandem trailers from using highways in the State.3 Section 3 of the Connecticut statute sets forth various provisions designed to restrict the use of tandem trailers on highways in the State, in the event that a court of competent jurisdiction enjoins enforcement of Section 24
On May 27, 1983, the United States commenced this case by filing a Complaint, a Motion for Preliminary Injunction, and a Memorandum of Points and Authorities in Support of Motion for Preliminary Injunction. The State of Connecticut filed its Answer on June 6, 1983 and its Memorandum in Opposition to Motion for Preliminary Injunction (“Connecticut Memorandum”) on June 8, 1983. Also on June 8, 1983, the United States filed a Plaintiffs’ Reply Memorandum in Support of Motion for Preliminary Injunction. A separate set of papers was filed by the parties in connection with the United States’ Motion to Pre[574]*574elude Evidence (filed June 3, 1983), which the court denied by ruling filed June 8, 1983. Conferences with counsel were held in chambers (partly on the record) and in open court on May 31, 1983 and June 3, 1983, at which the court considered and acted upon various applications regarding pre-trial proceedings. On June 9, 1983, a day-long evidentiary hearing on the motion for a preliminary injunction was held before the court, at which the State offered the testimony of nine witnesses on safety, legislative and regulatory issues.
II.
Proper consideration of the motion for a preliminary injunction must begin with an understanding of what this case involves. Simply stated, the Congress of the United States enacted a statute, and thereafter the Connecticut General Assembly enacted another statute. The United States asserts that the latter statute conflicts with the former and is, accordingly, pre-empted. The United States also asserts that, even if there were no Federal legislation, the Connecticut statute would work an unconstitutional interference with interstate commerce.
Where Federal and state statutes conflict, the Supremacy Clause of the United States Constitution, Art. VI, provides that the state statute must give way.5 A long history of law has established beyond the slightest doubt that Congress has pre-eminent authority under the Commerce Clause of the Constitution, Art. I, § 8, to legislate where activities affecting interstate commerce are concerned, to pre-empt those state laws in conflict with congressional enactments, and to prohibit state regulations concerning activities having a substantial effect on interstate commerce even in the absence of any contradictory congressional enactments.6
[575]*575In general, the power of Congress to preempt state legislation affecting interstate commerce is sweeping. In the case before this court, it is likely that the Connecticut statute, even in the absence of any congressional pre-emption, might have had an unconstitutional impact on interstate commerce.
Section 411(c) of the STAA specifically provides that no state shall prohibit tandem trailers from its highways. Thus, the STAA reveals an explicit congressional intention to pre-empt competing state legislation. Section 2 of the Connecticut statute, which announces' a ban on tandem trailers in the State, does precisely what Section 411(c) of the STAA provided a state could not do. Section 3 of the Connecticut statute, slated to come into play if enforcement of Section 2 is enjoined, imposes various restrictions and regulations on those who would drive tandem trailers on state highways. Thus, Section 3 burdens the activity that the STAA clearly seeks to protect.7 Hence, Section 3 of the Connecticut statute also appears to be pre-empted.
III.
In defense of its statute, the State of Connecticut has launched an attack that is ingenious and thorough, yet ultimately unavailing. Throughout the State’s case, the argument is made that tandem trailers ought to be banned, one way or another, from Connecticut’s highways.8 This court expresses no view on that question. It is not the function of this court in this case to second-guess a congressional determination.9 Where Congress acts pursuant to its authority under the Constitution and elects to pursue a certain course of action, those who disagree with Congress ordinarily must pursue their cause through political debate [576]*576and action, not through litigation.10 Nothing in the present case presents an occasion for deviation from these settled principles of American constitutional law.
A.
It does not advance Connecticut’s cause to argue that the STAA was adopted without findings of fact or the hearing of testimony.11 Even if true, it does not follow that this or any other court sits to consider whether, in passing a particular bill, Congress deliberated with due care and reflection. Nor does it help Connecticut to argue that Congress failed to demonstrate how legislation concerning tandem trailers affected interstate commerce: that trucking involves interstate commerce is virtually a self-evident proposition.12
B.
It is, of course, true that a court will not lightly assume that Congress meant to pre-empt state legislation.13 In this case, however, the words of Congress in § 411(c) of the STAA are explicit. There can be no question that pre-emption of state statutes barring tandem trailers was exactly what Congress sought to effect.
The State argues that Congress failed to specify what effect on interstate commerce it sought to achieve or why a requirement such as that contained in the STAA would help promote that effect.14 However, it is manifest that the STAA reflects a congressional interest in establishing uniform regulations governing the size, weight, and arrangements of trucks used in interstate commerce. In furtherance of that purpose, Congress adopted an approach neither irrational nor irrelevant. Nor, despite the State’s argument, is it apparent that Congress need have considered other means of achieving its purposes.15 Whether Congress chose wisely is not the issue before this court. Whether Congress made a choice that will ultimately prove self-defeating is not the issue before this court. To hold that Congress acted within its authority [577]*577under the Commerce Clause, all that this court need determine is that Congress acted with respect to an activity affecting interstate commerce and that the action it took was indeed reasonably related to the regulation of that commerce.16
The State’s argument that Congress was without authority under the Commerce Clause to enact the STAA or to pre-empt competing state legislation is thus without force. From that argument, we turn to the State’s contentions that the Fifth and Tenth Amendments to the Constitution bar a congressional enactment such as the STAA.
C.
The State has also asserted that the STAA must fall as a violation of Connecticut’s rights under the Due Process Clause of the Fifth Amendment to the United States Constitution, which clause is commonly deemed to incorporate guarantees of equal protection of the laws.17 It is doubtful that the State has the legal standing requisite to make this claim; but even if the claim is properly made, it cannot succeed. In a case such as this, due process is satisfied as long as Congress’ action was not patently irrational. The face of the statute itself reveals a rational purpose, that of facilitating interstate trucking. Moreover, Connecticut’s apparent argument that Congress impermissibly discriminated against drivers on Interstate highways (as against drivers on other federally-funded highways) must fail, because Congress could rationally distinguish between the two types of highways on the basis of the proportion of their costs funded by Federal contributions.18
D.
Throughout most of American constitutional history, the Tenth Amendment has been regarded as having little practical impact on Federal legislation. While the prevailing modern understanding of the Tenth Amendment may appear to have been reviewed afresh by the Supreme Court in National League of Cities v. Usery, 426 U.S. 833, 96 S.Ct. 2465, 49 L.Ed.2d 245 (1976), more recent decisions of the Court have defined with narrow precision the place of the Tenth Amendment in our Federal system of government. Hodel v. Virginia Surface Mining and Reclamation Association, Inc., 452 U.S. 264, 287-288, 101 S.Ct. 2352, 2366, 69 L.Ed.2d 1 (1981), set forth a rigorous test for the state asserting that Federal'legislation violates the Tenth Amendment. Among other things, a state making such a claim must show that the challenged legislation poses a “wide-ranging and profound threat to the structure of State governance.” EEOC v. Wyoming, -U.S.-,-, 103 S.Ct. 1054, 1062, 75 L.Ed.2d 18 (1983). Nothing in the record of this case or even remotely suggested by the State so much as hints that the STAA poses such a threat to “the structure of State governance” in Connecticut.
The State has argued that one form of interference worked by the STAA is that it undermines Connecticut’s decision-mak[578]*578ing.19 That argument, however, merely restates the fact that the STAA is at odds with the Connecticut statute.
It may or may not be the case that, as a consequence of the STAA, the State will, in some areas, be required to expend more money than it might otherwise have chosen to on traffic safety. But such an argument is speculative. There is a world of difference between a Federal statute that requires a state to commit funds and a statute that may have the incidental effect of increasing state spending. Deplorable as the latter consequence may be, it cannot provide a basis for a state challenge to the constitutionality of a congressional statute.
Finally, § 411(c) of the STAA does not compel the State to adopt or enforce a Federal regulatory scheme.20 Nowhere has Connecticut suggested what constitutes that scheme or how Connecticut believes itself required to implement it. Section 411(c) does require Connecticut to allow tandem trailers on certain highways. Connecticut’s role is purely passive: far more affirmative enforcement is demanded of the states under the Federal statute imposing a 55-mile-per-hour speed limit on traffic using federally-funded highways.21
The State’s concern with safety, however, merits a word of further discussion. With some misgivings about the relevance of the proposed evidence, this court permitted Connecticut to introduce testimony concerning the possible impact on highway safety of the STAA. See Ruling on Motion to Preclude (filed June 8, 1983), at 4-5. Having now heard that testimony, the court finds its initial doubts confirmed. Whether tandem trailers pose hazards for themselves or other drivers is a question for Congress to consider, and Congress is apparently now considering it.22 It is not a question that this court is institutionally equipped or constitutionally empowered to decide.
An assertion that a Federal statute may have some deleterious effect upon the people of a state does not amount to an adequate claim that the Federal statute violates the Tenth Amendment. Principles of national sovereignty outweigh even those concerns that strike the public as particularly urgent; the alternative proposed by the State would require that Federal judges regularly substitute their judgment for that of legislative and executive officials at all levels of government.
E.
The last of the State’s arguments is the assertion that, in promulgating a list of designated federally-funded highways in Connecticut, pursuant to § 411(e) of the STAA, the Secretary of Transportation vio[579]*579lated § 553(c) of the Administrative Procedure Act, 5 U.S.C. § 553(e), or other Federal law.23 As originally presented in the State’s Answer, that contention was put in the form of a statement that the STAA itself violated other Federal laws. But that, of course, is absurd: one Federal law cannot violate another Federal law. If two Federal laws are in irreconcilable conflict, the later one merely repeals the earlier. Perhaps recognizing that principle, the State now argues that, not the STAA, but the regulations published pursuant to it, violated other Federal laws.
This court need not consider whether the regulations at issue were in fact promulgated in violation of the Administrative Procedure Act or any other Federal law: indeed, even the question of the constitutionality of those regulations is not presented by this case.24 The only issue presented to this court is that of whether enforcement of the Connecticut statute should be enjoined. That enforcement will be enjoined if the Connecticut statute is pre-empted by the STAA, which, in turn, must be the case unless the STAA is itself unconstitutional. Thus, it is only the legitimacy of the STAA that concerns us here. The legitimacy of regulations under the STAA is irrelevant, because the Connecticut statute has been attacked as inconsistent with the STAA itself and not as inconsistent with any regulations. Even if the regulations were unconstitutional, the Connecticut statute would still be pre-empted, not by the regulations, but by the STAA.
IV.
Ordinarily, an applicant for preliminary injunctive relief must show (1) irreparable injury and (2) either probable success on the merits or sufficiently serious questions going to the merits to make them a fair ground for litigation and a balance of hardships tipping decidedly in favor of the party requesting a preliminary injunction.25 In the case at bar, the court concludes without hesitation that the United States has shown that it will be irreparably injured by the continuing violation of the STAA, a Federal statute, that would result from failure to enjoin enforcement of the Connecticut statute; the United States has shown as well that interstate truckers would be harmed financially or through threat of arrest.26 As the only questions that appear to be presented in this case seem, at present, to be legal ones, and as those questions have now been determined in favor of the United States, the likelihood that the United States will prevail on the merits is overwhelming.
[580]*580It is not necessarily true, however, that the court must reach even those conclusions. Where (as in this case) an ongoing violation of a Federal statute is threatened and that statute specifically authorizes injunctive relief, irreparable injury may be assumed.27 Whether the injury may be assumed or must be demonstrated, however, makes little difference. The court finds this to be the clearest sort of case for issuance of preliminary injunctive relief.
Accordingly, the plaintiffs’ motion is granted in all respects. A preliminary injunction shall enter forthwith.
It is so ordered.