delivered the opinion of the Court.
The issue in the case is whether the plaintiffs’ state common-law tort claims are impliedly preempted because they conflict with the National Traffic and Motor Vehicle Safety Act and Federal Motor Vehicle Safety Standard 108. Without specifying the ground, the trial court granted the defendant’s summary-judgment motion, which alleged both express and implied preemption. The court of appeals, relying on this Court’s opinion in
Hyundai Motor Co. v. Alvarado,
I. BACKGROUND
In October 1990, Garland Fredderick Wells was killed in a nighttime automobile accident. An eighteen-wheel tractor-trailer rig traveling immediately in front of him jackknifed and collided with an oncoming van. Wells’ car struck the trailer’s side. Wells’ wife, Sametrius Wells, and his child were traveling with him and were injured in the accident.
Great Dane Trailers manufactured the platform trailer in 1986. At that time, Standard 108 required a three-light, three-reflector configuration on each side of the trailer. Great Dane equipped its trailers with these required lights and reflectors. Specifically, each side of the trailer had one red reflex reflector and red side-marker light near the rear, one amber reflex reflector and amber side-marker light near the front, and one amber reflex reflector *740 and amber side-marker light near the middle.
Semetrius Wells, on her behalf, as her son’s next friend, and as adminstratrix of her husband’s estate, sued several defendants including Great Dane. They sought personal-injury damages as well as wrongful-death and survival damages based on negligence and products-liability theories. Initially, the Wellses alleged that Great Dane’s trailer was defectively manufactured, designed, or marketed because it lacked a lateral guard, allowing Wells’ car to penetrate under the trailer. After all Great Dane’s co-defendants settled with the Wellses, the Wellses amended their petition and deleted the original allegations about the lateral guard’s absence. Instead, they pleaded that Great Dane’s trailer was defectively manufactured, designed, or marketed because it was not equipped with “reasonable or necessary conspicuity devices.” In discovery responses, the Wellses claimed that the Great Dane trailer was unreasonably dangerous “because of an insufficiency of reflected [sic] material, fighting and other safety material which would have served to alert drivers.In sum, the Wellses alleged that Great Dane had a duty to add additional fights or reflectors to its trailer to make it more conspicuous at night.
Great Dane moved for summary judgment, asserting that the Safety Act and Standard 108 expressly and impliedly preempted the Wellses’ common-law con-spicuity claims. Great Dane’s summary-judgment evidence showed that its trailer fully complied with Standard 108’s requirements when Great Dane manufactured it and when it left Great Dane’s possession. In response, the Wellses conceded that Great Dane’s trailer fully complied with Standard 108. But they nevertheless contended that Great Dane should have increased the trailer’s conspicuity; that is, Great Dane’s trailer should have had additional lights or reflectors.
The trial court granted Great Dane’s summary-judgment motion and dismissed the Wellses’ claims. While the Wellses’ appeal was pending in the court of appeals, this Court decided
Alvarado. Alvarado,
In February 2000, Great Dane petitioned this Court to review the court of appeals’ judgment. Great Dane presented two questions:
1. Should this Court correct and reverse its opinion in Alvarado to acknowledge what countless other courts have concluded: the Safety Act expressly and impliedly preempts common-law safety standards, not identical to those specified by the Safety Act?
2. Even if this Court is unwilling to correct and reverse its opinion in Alvarado, did the court of appeals err when it relied on Alvarado to conclude, without discussion, that Standard 108, a safety standard neither analyzed nor mentioned in Alvarado, did not impliedly *741 preempt respondent’s common-law claims?
In May 2000, while this appeal was pending, the United States Supreme Court decided
Geier v. American Honda Motor Co.,
But the Supreme Court also held that Standard 208 impliedly preempted the
Geier
plaintiffs’ claims because those common-law claims conflicted with Standard 208. The Court observed that preemption based on conflict is different from an agency’s express statement about preemptive intent because conflict preemption turns on identifying an actual conflict and not on an express statement.
Geier,
After reviewing Standard 208’s history, the
Geier
Court concluded that Standard 208 reflects the Secretary’s policy that safety would be best promoted if manufacturers installed
alternative
passive-restraint systems in their cars rather than one particular system in every car.
Geier,
Following Geier, this Court requested full briefing from the parties. Great Dane conceded that Geier precludes our holding that the Safety Act and Standard 108 expressly preempt nonidentical state common-law standards established in tort actions covering the same performance aspect as an applicable federal standard. Thus, on the merits, Great Dane reframed the issue as:
Are the Wellses’ state common-law tort claims impliedly preempted because they conflict with the Safety Act and Standard 108?
*742 We granted Great Dane’s petition to apply Geier’s implied-preemption analysis to this issue.
II. APPLICABLE LAW
A. Statutory Overview
In 1966, Congress enacted the Safety Act, implemented under the National Highway Traffic Safety Administration’s authority. The Safety Act’s explicit purpose is “to reduce traffic accidents and deaths and injuries to persons resulting from traffic accidents.” 15 U.S.C. § 1381 (recodified at 49 U.S.C. § 30101).
1
To accomplish this purpose, Congress empowered the Secretary of Transportation to adopt motor vehicle safety standards. 15 U.S.C. § 1392(a) (recodified at 49 U.S.C. § 30111(a)). These standards must be “reasonable, practicable and appropriate.”
See
15 U.S.C. § 1392(f)(3) (recodified at 49 U.S.C. § 30111(b)(3)). Additionally, the standards must meet the need for motor vehicle safety and be stated in objective terms.
See
15 U.S.C. § 1392(a) (recodified at 49 U.S.C. § 30111(a)). The standards the Secretary adopts under the Safety Act are, fundamentally, performance requirements, not design requirements.
See Perry v. Mercedes Benz, Inc.,
[T]he new and revised standards are expected to be performance standards, specifying the required minimum safe performance of vehicles but not the manner in which the manufacturer is to achieve the specified performance.... The Secretary would thus be concerned with the measurable performance of a ... system but not its design details.
S.Rep. No. 89-1301, at 4 (1966), reprinted in 1966 U.S.C.C.A.N. 2709, 2712.
Under Texas law, a manufacturer is liable in a products-liability action only if the product was defective when it was manufactured and left the manufacturer’s control.
See Firestone Steel Prods. Co. v. Barajas,
In conformity with the Safety Act, the Secretary adopted Standard 108, which specifies requirements for original and replacement lamps, reflective devices, and associated equipment. See 49 C.F.R. § 571.108, SI (1986). Standard 108’s stated purpose in specifying conspicuity requirements was to ensure vehicles had the “equipment necessary for signaling and for the safe operation of motor vehicles during darkness and other conditions of reduced visibility.” 49 C.F.R. § 571.108, SI (1986). To accomplish this purpose, Standard 108 described in detail the illumination equipment required to reach the necessary level of conspicuity-a three-light and three-reflector configuration on each trailer side. See 49 C.F.R. § 571.108, S4 (1986). Two sections of Standard 108 particularly relevant to this appeal provide:
[Reflective tape] ... may be used for side reflex reflectors if this material as used on the vehicle, meets the performance standards....
49 C.F.R. § 571.108, S4.1.1.4 (1986).
No additional lamp, reflective device, or other motor vehicle equipment shall be *743 installed that impairs the effectiveness of lighting equipment required by this standard.
49 C.F.R. § 571.108, S4.1.3 (1986).
B. PREEMPTION
The laws of the United States are the “supreme Law of the Land ... any Thing in the Constitution or Laws of any State to the Contrary notwithstanding.” U.S. Const, art. VI, cl. 2. If a state law conflicts with federal law, it is preempted and has no effect.
Maryland v. Louisiana,
The United States Supreme Court limits the preemption doctrine by presuming that Congress did not intend to displace state law.
See Maryland,
III. ANALYSIS
As we have noted, the parties agree that Geier forecloses express preemption under Standard 108. Thus, we need determine only whether the Safety Act and Standard 108 impliedly preempt the Wellses’ state tort claims.
A. The Parties’ Contentions
Great Dane has two basic contentions. First, Great Dane argues that the same analysis the Geier Court applied to conclude that the Safety Act and Standard 208 impliedly preempted the tort claims applies in this case. Great Dane contends that allowing the Wellses to pursue their state tort claims interferes with the Secretary’s objective in adopting Standard 108. This objective, Great Dane notes, was to develop the optimum conspicuity system and to gradually phase-in that system, thereby accomplishing the Safety Act’s goal of reducing traffic accidents. Second, Great Dane argues that the Wellses’ state *744 tort claims are preempted because these claims are diametrically opposed to Standard 108’s purpose of uniformity.
In response, the Wellses contend that implied preemption is case specific, and because
Geier
considered implied preemption of a different common-law claim under a different Safety Act standard, the
Geier
Court’s finding an actual conflict does not compel the same result here.
See Geier,
Furthermore, the Wellses argue that their tort claims do not obstruct congressional objectives. They disagree with Great Dane’s assertion that uniform trailer marking is Standard 108’s primary purpose. Rather, they argue, the standard’s text, the standard’s history, and most cases examining this issue demonstrate that reducing accidents is Standard 108’s primary goal. The Wellses thus conclude that strict uniformity is not a barrier to manufacturer-initiated improvements to the minimum conspicuity requirements.
B. STANDARD 108 DOES NOT IMPLIEDLY PREEMPT THE WELLSES’ COMMON-LAW CLAIMS
We agree with the Wellses that we must analyze their common-law claims, the Safety Act, and Standard 108 under traditional preemption principles. See Geier,
Great Dane bases its two arguments for implied preemption solely on conflict-preemption principles. Thus, Great Dane must persuade us that allowing the Wells-es to proceed with their common-law claims would actually conflict with the Safety Act or Standard 108. See
Myrick,
1. No Conflict With The Secretary’s Objectives
Great Dane’s first argument is that, under
Geier’s
analytical framework, it is clear that the Wellses’ state tort claims conflict with the Secretary’s “means-related federal objectives” in promulgating Standard 108.
See Geier,
The Secretary ultimately required a gradual phase-in, mandating additional reflectors on all trailers manufactured on or after 1993, and, beginning in 1999, requiring that all older trailers be retrofitted with additional reflectors over a defined timetable. Thus, Great Dane asserts, this case is similar to
Geier
in which the Court, in finding implied preemption, relied partly on the Secretary’s express policy judgment that safety would be promoted by allowing manufacturers to use alternative restraint devices in them cars, rather than one particular passive-restraint system.
See Geier,
We disagree that Geier requires our determining that the Wellses’ common-law claims conflict with the Secretary’s goals in promulgating the 1986 Standard 108. Rather, we conclude that the Wellses’ proposed common-law conspicuity standard does not actually conflict with Standard 108 or the Secretary’s objectives in adopting Standard 108. See 49 C.F.R. § 571.108, S4.1.1 (1986) (“[E]ach vehicle shall be equipped with at least the number of lamps, reflective devices, and associated equipment specified_” (emphasis added)). Unlike Standard 208 in Geier, which permitted alternative passive-restraint device standards, Standard 108 establishes only minimum conspicuity standards that states are free to strengthen through tort law. Moreover, the Secretary’s extensive studies in the 1970s and the 1980s to collect data about ways to improve trailer conspicuity demonstrate the Secretary’s desire to learn about more effective conspi-cuity markings and configurations than the existing minimum standards. See 45 Fed. Reg. 35405, 35406 (1980). In 1987, the Secretary concluded that further study was needed before amending Standard 108, and thus, the Secretary sought manufacturers’ comments about them experiences with other reflective materials and sought additional information about various viewing angles, colors, and patterns. See 52 Fed.Reg. 35345, 35346 (1987). It was not until 1992 that the Secretary published its final rule amending Standard 108 to require that all trailers manufactured after December 1993 provide a specific reflective pattern. See 57 Fed.Reg. 58406, 58413 (1992) (codified at 49 C.F.R. 571.108, S5.7). And, finally, it was not until March 1999 that the Secretary required all trailers manufactured before December 1993 to be retrofitted to comply with the amended Standard 108. See 64 Fed.Reg. 15588, 15605 (1999); 49 C.F.R. § 393.13(b) (1999). Thus, it is difficult to envision how a heightened common-law conspicuity requirement in 1986 would have conflicted with the Secretary’s goal at that time to improve conspicuity markings and configurations.
Furthermore, relying on the Secretary’s studies from 1967 to 1975, and from 1980 to 1991, to improve Standard 108, Great Dane contends that inconsistent standards for reflectivity would have impeded the Secretary’s review of its regulations.' Specifically, Great Dane contends that there would have been a conflict with federal policy favoring safety if Texas common-law required additional reflective materials on trailers in 1986 because the Secretary would not have had the necessary baseline data to determine the effectiveness of the alternate designs under consideration.
But Great Dane does not persuade us. Under its approach, implied preemption would occur any time the Secretary studied its regulations’ effectiveness. We do not see how recognizing the Wellses’ common-law claims would “actually conflict” with the agency’s ability to study safety-equipment performance. Moreover, im
*746
plied-preemption analysis only rejects state tort claims that stand as an obstacle to the Secretary’s objectives in its studies.
See Geier,
Great Dane also argues that even if state tort law is consistent with federal goals, the Wellses’ claims are still preempted because they interfere with the methods that federal law has chosen to achieve those goals.
See International Paper Co. v. Ouellette,
Great Dane attempts to distinguish between allowing additional reflective equipment and requiring it, citing the National Highway Traffic Safety Administration’s interpretations of Standard 108. However, what these agency opinions actually decide is that
state legislators
and
state agencies
may permit, but not mandate, equipment in addition to what Standard 108 requires. We recognize that under the Safety Act’s preemption clause, state legislators and agencies are prohibited from enacting heightened requirements. See 15 U.S.C. § 1392(d) (recodified at 49 U.S.C. § 30103(b)) (“Whenever a Federal motor vehicle safety standard ... is in effect, no State or political subdivision of a State shall have any authority either to establish, or continue in effect ... any safety standard applicable to the same aspect of performance ... which is not identical to the Federal standard.”). But the Safety Act’s saving clause allows states to impose higher standards-assuming they do not actually conflict with a federal law’s or regulation’s purposes-through the state’s common law.
See
15 U.S.C. § 1397(k) (re-codified at 49 U.S.C. § 30103(e)) (“Compliance with any Federal motor vehicle safety standard issued under this subchapter does not exempt any person from any liability under common law.”);
see also Geier,
We recognize that our holding that the Wellses’ state tort claims are not impliedly preempted may seem counterintuitive; a manufacturer could have complied with Standard 108 as it existed in 1986 but still be exposed to state tort claims. See Rabin, Reassessing Regulatory Compliance, 88 Geo. L.J. 2049,2060 (2000); Dinh, Reassessing the Law of Preemption, 88 Geo. L.J. 2085, 2115 (2000). Nevertheless, Geier’s implied preemption analysis, together with the federal standard that existed in 1986, dictate our conclusion.
2. No Conflict With UnifoRmity
Great Dane’s second argument is that the Wellses’ common-law claims actually conflict with the Safety Act and Standard 108 because they defeat the federal goal of national uniformity in the area of motor vehicle safety features. Great Dane asserts that Standard 108’s history and purpose reflect the Secretary’s belief that lights and reflectors need to be standardized to promote reliable expectancy in drivers. Great Dane further contends that common sense dictates that standardizing lighting and reflector systems helps drivers judge other vehicles’ presence. Great Dane claims that uniformity in trailer con-spicuity is especially important because motorists must be able to identify trailers and recognize them as potential hazards. Here, Great Dane argues, uniformity has even greater importance in Standard 108’s context than in Standard 208’s context in Geier, because uniform conspicuity requirements affect other drivers’ performance. Also, Great Dane asserts that lighting and reflector systems should be uniform to prevent manufacturers from being subjected to different requirements that juries may set in different states.
But as we have already discussed, the Safety Act allows state common law to establish higher, non-conflicting standards.
See
15 U.S.C. § 139700 (recodified at 49 U.S.C. § 30103(e));
Geier,
Also, as the Wellses point out, Great Dane must have believed it was free to supplement the federal standard; it installed additional visibility equipment as early as 1978 when customers ordered and paid for it. And, as a practical matter, it is doubtful that drivers who already understood that three lights and three reflectors (Standard 108’s minimum requirements) indicated a trailer’s side would drive into the side because it had additional reflective tape on it.
Additionally, when Great Dane manufactured its trailer, the Safety Act reflected “a congressional determination that occa
*748
sional nonuniformity is a small price to pay for a system in which juries not only create, but also enforce, safety standards, while simultaneously providing necessary compensation to victims.”
Geier,
3. Other CouRts
Furthermore, the weight of case law supports our conclusion that Standard 108, as written in 1986, does not impliedly preempt common-law claims about insufficient trailer conspicuity. The leading case is
Buzzard v. Roadrunner Trucking, Inc.,
Encouraging manufacturers to act in a way that increases safety does not frustrate the primary purpose of the Safety Act. Nor does it make it impossible to comply with both federal and state law, as it does not suggest that illumination equipment mandated by state common law be used instead of that required by federal law, but only in addition to that specified in Standard 108. To the extent Buzzard can show there is other equipment that increases conspicuity without reducing the effect of the required equipment, his action does not actually conflict with the Safety Act or Standard 108. So limited, actions like Buzzard’s aid the development of feasible lighting systems that improve on the illumination provided by compliance with Standard 108 and thereby aid federal law in developing illumination design standards to meet the needs of modern motorists.
Buzzard,
Great Dane relies on
Crowe v. Fleming,
Great Dane also relies on
Lady v. Neal Glaser Marine, Inc.,
In reaching its holding, the
Lady
court recognized that the plaintiffs common-law claims would effectively require boat manufacturers to install propeller guards, directly contravening the agency’s policy against mandating such a device.
Lady,
IV. CONCLUSION
Allowing the Wellses to pursue their common-law claims does not interfere with the Secretary’s important means-related federal objectives in promulgating the 1986 Standard 108. Nor do their common-law claims conflict with the Safety Act’s and Standard 108’s uniformity requirements. Accordingly, we hold that the Safety Act and Standard 108 do not impliedly preempt the Wellses’ common-law conspi-cuity claims. Therefore, we affirm the court of appeals’ judgment.
Notes
. The Safety Act was initially codified in chapter 15 of the United States Code, but in 1994 it was recodified in chapter 49. See Pub.L. No. 103-272, 108 Stat. 745 (1994) (recodified at 49 U.S.C. §§ 30101-30169). Although the recodification did not substantively change the Safety Act, the court of appeals and parties have referred to the pre 1994 statute, and, in the interest of consistency, we do the same.
