NHTSA Interpretation File Search
Overview
NHTSA's Chief Counsel interprets the statutes that the agency administers and the standards and regulations that it issues. Members of the public may submit requests for interpretation, and the Chief Counsel will respond with a letter of interpretation. These interpretation letters look at the particular facts presented in the question and explain the agency’s opinion on how the law applies given those facts. These letters of interpretation are guidance documents. They do not have the force and effect of law and are not meant to bind the public in any way. They are intended only to provide information to the public regarding existing requirements under the law or agency policies.
Understanding NHTSA’s Online Interpretation Files
NHTSA makes its letters of interpretation available to the public on this webpage.
An interpretation letter represents the opinion of the Chief Counsel based on the facts of individual cases at the time the letter was written. While these letters may be helpful in determining how the agency might answer a question that another person has if that question is similar to a previously considered question, do not assume that a prior interpretation will necessarily apply to your situation.
- Your facts may be sufficiently different from those presented in prior interpretations, such that the agency's answer to you might be different from the answer in the prior interpretation letter;
- Your situation may be completely new to the agency and not addressed in an existing interpretation letter;
- The agency's safety standards or regulations may have changed since the prior interpretation letter was written so that the agency's prior interpretation no longer applies; or
- Some combination of the above, or other, factors.
Searching NHTSA’s Online Interpretation Files
Before beginning a search, it’s important to understand how this online search works. Below we provide some examples of searches you can run. In some cases, the search results may include words similar to what you searched because it utilizes a fuzzy search algorithm.
Single word search
Example: car
Result: Any document containing that word.
Multiple word search
Example: car seat requirements
Result: Any document containing any of these words.
Connector word search
Example: car AND seat AND requirements
Result: Any document containing all of these words.
Note: Search operators such as AND or OR must be in all capital letters.
Phrase in double quotes
Example: "headlamp function"
Result: Any document with that phrase.
Conjunctive search
Example: functionally AND minima
Result: Any document with both of those words.
Wildcard
Example: headl*
Result: Any document with a word beginning with those letters (e.g., headlamp, headlight, headlamps).
Example: no*compl*
Result: Any document beginning with the letters “no” followed by the letters “compl” (e.g., noncompliance, non-complying).
Not
Example: headlamp NOT crash
Result: Any document containing the word “headlamp” and not the word “crash.”
Complex searches
You can combine search operators to write more targeted searches.
Note: The database does not currently support phrase searches with wildcards (e.g., “make* inoperative”).
Example: Headl* AND (supplement* OR auxiliary OR impair*)
Result: Any document containing words that are variants of “headlamp” (headlamp, headlights, etc.) and also containing a variant of “supplement” (supplement, supplemental, etc.) or “impair” (impair, impairment, etc.) or the word “auxiliary.”
Search Tool
NHTSA's Interpretation Files Search
| Interpretations | Date |
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ID: nht75-1.26OpenDATE: 12/08/75 FROM: AUTHOR UNAVAILABLE; R. L. Carter; NHTSA TO: Brainerd & Bridges TITLE: FMVSS INTERPRETATION TEXT: This is in response to your October 30, 1975, letter requesting clarification of the status of the banding requirement of Federal Motor Vehicles Safety Standard No. 106-74, Brake Hoses. The National Highway Traffic Safety Administration (NHTSA) has granted petitions, filed by General Motors Corporation and Ford Motor Company, which requested deletion of the banding requirement. This deletion is the "change now being developed in our rulemaking proceedings" to which you have referred. The complete elimination of the banding requirement is inconsistent with any substitute labeling requirement. The petition of your client, Kugelfischer Georg Shafer & Co., was denied for this reason. You should understand that our commencement of a rulemaking proceeding does not signify that the requested amendment will necessarily be issued. It does indicate, however, a determination that there is a reasonable possibility that the requested amendment will be issued. A final decision concerning the issuance of a proposal to amend the standard will be made on the basis of all available information developed in the course of the proceeding, in accordance with statutory criteria. If the NHTSA determines that such an amendment would not be appropriate, the amendment which you have requested will be considered as an alternative. We do expect to issue a proposal in the near future. SINCERELY, BRAINERD & BRIDGES October 30, 1975 Robert L. Carter Associate Administrator Motor Vehicle Programs U.S. Department of Transportation National Highway Traffic Safety Administration REF: N40-30 On September 29, 1975 you sent me a letter a photo of which is attached, in which your Department denied the petition of our client, Kugelfischer Georg Schafer & Co. for an amendment of the banding requirement of Federal Motor Vehicle Safety Standard No. 106-74, Brake Hoses. In your letter you stated that the amendment has been denied because it ". . . is inconsistent with the deletion of the banding requirement": Of course the amendment went specifically to the request that the banding requirement be waived under circumstances in which positive identification through multiple other means was at all times assured. Waiver of the banding requirement under such circumstances would not have relinquished any advantage or omitted any function inasmuch as the sole purpose of the banding requirement is to insure identity of manufacturer. In any event, you have also stated that perhaps a "change now being developed in the rulemaking proceedings will be satisfactory" to Kugelfischer Georg Schafer & Co.. Would you be kind to advise me when such change is expected and what the nature thereof may be. Our client is intimately concerned with this problem and regrets that our prior petitions were sufficiently unclear as to have failed to explain the redundancy of the banding requirement under circumstances in which manufacturer-identity is otherwise clearly established. Andrew W. Brainerd |
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ID: nht69-2.21OpenDATE: 06/05/69 FROM: H.A. HEFFRON -- CHIEF COUNSEL, NHTSA; CONCURRENCE OF TENNEY JOHNSON -- MVSPS TO: G. M. Hilgendorf, Esq. TITLE: FMVSS INTERPRETATION TEXT: Mr. Frank Coy, Special Assistant to the Under Secretary of Transportation, has asked that I respond to your letter of April 16, 1969, in which you ask whether a station wagon purchased in March of 1968, equipped with two ply tires, violates Federal Motor Vehicle Safety Standard No. 109. The vehicle you purchased was apparently manufactured prior to April 1, 1968, and therefore, it was not required to be equipped with tires conforming to Standard No. 109. However, even if the standards were applicable, because a tire is labeled "2-ply" it is not necessarily a non-conforming tire. Standard No. 109 does not specifically require tires to have a given number of plies. It does require that irrespective of any ply rating tires pass minimum performance tests. As to passenger cars, Standard No. 110 requires that passenger cars manufactured after April 1, 1968, (1) must be equipped with tires that comply with Standard No. 109; and (2) the vehicle must not place a load on any of the tires greater than the load capacity of the tire specified in Standard No. 109. |
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ID: nht75-4.43OpenDATE: 05/16/75 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Department of California Highway Patrol TITLE: FMVSR INTERPRETATION TEXT: This is in reply to your letter of February 25, 1975, requesting several interpretations of 49 CFR Part 569, "Regrooved Tires." The present Regrooved Tire regulation results from a U.S. Court of Appeals decision (NAMBO v. Volpe 484 F.2d 1294 (D.C. Cir. 1973), cert. denied U.S. (1974) which invalidated certain aspects of the previous requirements. The confusion apparent in the existing requirements results from Section 204 of the National Traffic and Motor Vehicles Safety Act (15 U.S.C. 1424) which, when read literally, only authorizes the NHTSA to permit the sale of regrooved tires. That statutory section has since been revised (Sec. 110, Pub. L. 93-492, 88 Stat. 1470, October 27, 1974) and the NHTSA will revise Part 569 to provide a more realistic regulatory scheme than that contained in the present requirements. While we have answered as best we can the questions you raise, we believe any extensive enforcement program you plan for the requirements should be deferred until new regulations are issued. Section 569.1 Purpose and scope, provides that the regulation specifies requirements under which regrooved tires may be sold. This should not be interpreted as precluding the enforcement of the regulation against other commercial transfers, such as offering for sale, the introduction or delivery for introduction into interstate commerce, etc. Section 569.7(a) specifically prohibits those activities. Section 569.7(a) also prohibits an operator, including a public transit system, from regrooving his own tires under any circumstance; he may not, as you suggest, regroove them and sell them to others. Section 569.7(a)(1) specifically states that a person regrooving his own tires for use on motor vehicles is to be considered as delivering those tires for introduction into interstate commerce, which is a prohibited activity. Section 569.7(b) prohibits any of the proscribed commercial activities with respect to tires siped in the manner set forth in that section. You are apparently again misinterpreting the Scope section. With respect to your question regarding the labeling of retreaded regroovable tires, such tires must be labeled in accordance with section 569.9. There are numerous procedures by which labeling can be molded onto retreaded tires. Two with which we are familiar involve either a cutting or engraving of the matrix or the insertion of metal strips into the matrix during curing. |
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ID: 7246-3Open Mr. Hal Balzak Dear Mr. Balzak: This responds to your letter concerning Federal Motor Vehicle Safety Standard No. 201, Occupant Protection in Interior Impact. I apologize for the delay in our response. You stated that you have received a copy of this standard and would like clarification of two issues. Your questions are addressed below. Your first question asked whether Standard No. 201 applied to passenger cars manufactured between January 1, 1968 and September 1, 1981. The answer to this question is yes; the standard applied to all passenger cars manufactured on or after January 1, 1968. Your second question asked whether Standard No. 201 applies to instrument panels manufactured for replacement of damaged units. The answer to this question is that, by its own terms, Standard No. 201 applies only to new motor vehicles. This means that the standard applies to original equipment components, including instrument panels, but not to replacements for those components. However, you should be aware of an important provision in Federal law. Section 108(a)(2)(A) of the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1397(a)(2)(A)) provides that "(n)o manufacturer, distributor, dealer, or motor vehicle repair business shall knowingly render inoperative, in whole or part, any device or element of design installed on or in a motor vehicle or item of motor vehicle equipment in compliance with an applicable Federal motor vehicle safety standard. . . ." This provision applies to both new and used vehicles. You specifically asked about the replacement of damaged instrument panels. I note that the Safety Act does not require a manufacturer, distributor, dealer or repair business to return a vehicle to compliance with a standard if a device or element of design has been "rendered inoperative" by another agent, such as a crash. The prohibition of section 108(a)(2)(A) does not apply to individual owners who alter their own vehicles. Thus, individual owners may install any item of motor vehicle equipment regardless of its effect on compliance with Federal motor vehicle safety standards. However, NHTSA encourages vehicle owners not to tamper with the safety equipment installed on their vehicles. I hope this information is helpful. If you have further questions, please feel free to contact Edward Glancy of my staff at (202) 366-2992. Sincerely,
Paul Jackson Rice Chief Counsel ref:201#VSA d:6/11/92
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1992 |
ID: nht92-6.9OpenDATE: June 11, 1992 FROM: Paul Jackson Rice -- Chief Counsel, NHTSA TO: Hal Balzak TITLE: None ATTACHMT: Attached to letter dated 12/3/91 from Hal Balzak to NHTSA, U.S. DOT TEXT: This responds to your letter concerning Federal Motor Vehicle Safety Standard No. 201, Occupant Protection in Interior Impact. I apologize for the delay in our response. You stated that you have received a copy of this standard and would like clarification of two issues. Your questions are addressed below. Your first question asked whether Standard No. 201 applied to passenger cars manufactured between January 1, 1968 and September 1, 1981. The answer to this question is yes; the standard applied to all passenger cars manufactured on or after January 1, 1968. Your second question asked whether Standard No. 201 applies to instrument panels manufactured for replacement of damaged units. The answer to this question is that, by its own terms, Standard No. 201 applies only to new motor vehicles. This means that the standard applies to original equipment components, including instrument panels, but not to replacements for those components. However, you should be aware of an important provision in Federal law. Section 108(a)(2)(A) of the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1397(a)(2)(A)) provides that "(n)o manufacturer, distributor, dealer, or motor vehicle repair business shall knowingly render inoperative, in whole or part, any device or element of design installed on or in a motor vehicle or item of motor vehicle equipment in compliance with an applicable Federal Motor vehicle safety standard. . . ." This provision applies to both new and used vehicles. You specifically asked about the replacement of damaged instrument panels. I note that the Safety Act does not require a manufacturer, distributor, dealer or repair business to return a vehicle to compliance with a standard if a device or element of design has been "rendered inoperative" by another agent, such as a crash. The prohibition of section 108(a)(2)(A) does not apply to individual owners who alter their own vehicles. Thus, individual owners may install any item of motor vehicle equipment regardless of its effect on compliance with Federal motor vehicle safety standards. However, NHTSA encourages vehicle owners not to tamper with the safety equipment installed on their vehicles. I hope this information is helpful. If you have further questions, please feel free to contact Edward Glancy of my staff at (202) 366-2992. |
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ID: nht78-3.1OpenDATE: 04/27/78 FROM: AUTHOR UNAVAILABLE; J. J. Levin, Jr.; NHTSA TO: Bureau of Transportation - L.A., CA TITLE: FMVSS INTERPRETATION TEXT: This responds to your March 10, 1978, question whether Standard No. 121, Air Brake Systems, applies to a device that automatically applies to vehicle's service brakes when a sensing bumper mounted at the rear of the vehicle is tripped by contact with an object during a backing maneuver. For purposes of your question, I assume that the vehicle, whether new or used, has been certified to comply with Standard No. 121 prior to installation of the device. The answer to your question is no. Paragraph S3 (Applicability) of Standard No. 121 states that the standard applies to trucks, buses, and trailers equipped with air brake systems (with some specified exceptions). The standard therefore applies only to vehicles, and does not apply to motor vehicle equipment such as the braking actuator you describe. The vehicle must, of course, conform to Standard No. 121 following installation of the device, if the installation occurs prior to the first purchase in good faith for purposes other than resale. After the first retail sale, $ S 108(a)(2)(A) of the National Traffic and Motor Vehicle Safety Act (the Act) (15 U.S.C. $ S 1397(a)(2)(A)) prohibits, with one exception, manufacturers, distributors, dealers, and repair businesses from knowingly rendering inoperative devices or elements of design installed in satisfaction on a safety standard such as Standard No. 121. |
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ID: 86-6.5OpenTYPE: INTERPRETATION-NHTSA DATE: 12/05/86 FROM: AUTHOR UNAVAILABLE; Erika Z. Jones; NHTSA TO: no addressee TITLE: FMVSS INTERPRETATION TEXT:
This is in reply to your letter of September 12, 1986, to the National Highway Traffic Safety Administration, and your letter to me of november 13, asking for our comments on four new motor vehicle lighting devices.
The first device performs a combination of two functions. It consists of three lamps serving as identification lamps and will meet all requirements of Standard No. 108 for such equipment. The three lamp cluster will also serve a auxiliary stop lamps (mistakenly referred to as a turn lamp in the November letter). The second device is a clearance lamp meeting requirements of Standard No. 108, which would also serve as an auxiliary stop lamp (also mistakenly referred to a a turn lamp in the November letter). The third device is described as a "tracking lamp" ( the diagram shows this to be the rear side marker lamp required by Standard No. 108) meeting all requirements for such; it will also serve as an auxiliary side turn signal indicator. The fourth device will serve as an intermediate side marker lamp, complying with Standard No. 108's requirements, but will also serve as an auxiliary side turn signal lamp. The devices are intended for use on wide trucks and trailers. In your opinion, the auxiliary functions will not "confuse or inhibit" the functioning of lighting equipment required by Standards No. 108.
With respect to the combination of lamp functions or truck and trailers, Standard No. 108, specifically paragraph S4.4, prohibits only the optical combination of clearance lamps with taillamps or identification lamps. These combinations do not exist in any of your four proposed designs. Under paragraph S4.1.3 supplemental lighting devices are permitted as long as they do not impair the effectiveness of lighting equipment required by Standard No. 108. You have concluded that there would be no impairment. Under the facts as presented in your letter, we have no reason to disagree with that conclusion.
We have noted your request that your letters be accorded confidential treatment because of proprietary commercial information, and your attorney's consent on your behalf that our interpretation may be made public provided that all information identifying you as the writer is deleted. We shall follow this procedure.
Sincerely, Erika Z. Jones Chief Counsel |
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ID: 77-3.28OpenTYPE: INTERPRETATION-NHTSA DATE: 07/15/77 FROM: AUTHOR UNAVAILABLE; J. J. Levin, Jr.; NHTSA TO: Algus Enterprises, Inc. TITLE: FMVSS INTERPRETATION TEXT: This responds to your June 27, 1977, letter asking whether tires that you export for use on agricultural vehicles are required by the National Highway Traffic Safety Administration (NHTSA) to be labeled with the letters DOT. The answer to your question is no, unless the tires can also be used on vehicles other than agricultural vehicles. If the tires can be so used, they must be marked with the DOT symbol and meet any Federal requirements applicable to them. Sincerely, ATTACH. Algus Enterprises, Inc. June 27, 1977 J. J. Levin -- Chief Counsel National Highway Traffic Safety Administration, U.S. Department of Transportation Dear Sir: Your name was kindly refered to us by Mr. Casanova, in the Tire Division of the Department of Transportation, because we are in need of your assistance. Our firm specializes in the exportation of tires. Our major market at this time is Venezuela, and we have a small problem there. A short time back we made a shipment of Agricultural tires to one of our clients. He contacted us this morning informing us that his shipment has not allowed in the country by the government agency "COVENIN" which is responsable for verification of quality on imports to Venezuela. The reason they objected was that the Agricultural tires did not have the letters D.O.T. on the actual tires. They do have the serial number and brand. We informed him that Agricultural tires in the U.S. are not required to have the (D.O.T.) on them, only the registration number and tire brand are normal nomenclature on Agricultural tires. He then informed us that the Venezuela government required a letter from the Department of Transportation confirming and explaining that Agricultural tires are not required to show the (D.O.T.) on the tire. We respectfully request that you please send us a letter with the information they require, so that we may forward it to them. It will supply the Venezuelan Government with proper information so that they may conduct their business properly. In hopes that we may hear from you soon. I remain, Sincerely, Gustavo R. Lima -- Vice-President cc: files |
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ID: GF007220-2OpenLouis J. Carlin, Director Dear Mr. Carlin: This concerns your letter dated October 11, 2004, in which you requested an interpretation of certain requirements in Federal Motor Vehicle Safety Standard (FMVSS) No. 110, Tire Selection and Rims. We have reconsidered our response dated January 3, 2005 with respect to permissible load identifications. In your October 11, 2004 letter, you asked whether S4.3 of FMVSS No. 110, as amended by the final rule responding to petitions for reconsideration (see 69 FR 31306, June 3, 2004) allows a light truck tire load identification of B, C, D, E, or F on the tire information placard. In our response, we stated that S4.3(i) of FMVSS No. 110 permits only a tire load identification XL or "reinforced". We noted, however, that we were considering petitions for reconsideration asking the agency to permit light truck load identifications of B, C, D, E, or F on tire information placards. We have reconsidered our previous interpretation. While the agency declined to allow load index numbers on the tire placards (see id. at 31311) , we decided to allow load identifications of XL and "reinforced". The preamble to the final rule did not elaborate on other load identifications (see id. at 31312). As you note in your letter, load identifications of B, C, D, E, or F are used for light truck tires to identify load carrying capability in the same way XL is used for passenger car tires to identify extra load carrying capability. In permitting the use of XL for passenger car tires, we stated:
In making this change, it was not our intent to allow the load identification for passenger car tires, but prohibit it for light truck tires. Accordingly, while S4.3(i) currently specifies only that a tire load identification XL or "reinforced" may appear on the tire information placard (see id. at 31318), we interpret that section to permit use of the corresponding light truck tire load identifications of B, C, D, E, or F. We intend to make this clear in the regulatory text as part of our response to petitions for reconsideration of the June 3, 2004 final rule. I hope you find this information helpful. If you need further assistance, please contact George Feygin of my staff at this address or at (202) 366-2992. Sincerely, Chief Counsel |
2005 |
ID: 22382OpenMr. Donald Myers Dear Mr. Myers: This is in response to your letter of November 3, 2000, requesting information on Federal Motor Vehicle Safety Standard (FMVSS) No. 121, "Air Brake Systems." Specifically, you describe the following situation: Haldex Brake Systems discovered that an internal component to the valve that controls the trailer supply pressure and the tractor parking brakes (made in 1997) was breaking after being in use for several years. This broken component resulted in the lack of separation of the two brake circuits. Haldex determined that this broken component resulted in the air brakes no longer complying with FMVSS No. 121, and that this broken component combined with a major leak in the brake system could result in total loss of the service brakes. Haldex initiated a recall and has been replacing the valves. Haldex has sought reimbursement from its supplier for the cost of the recall, but the supplier has refused, stating that FMVSS No. 121 applies to new motor vehicles only, not to "in service" motor vehicles. You ask whether FMVSS No. 121 applies to "in service" motor vehicles. The answer is no. FMVSS No. 121 applies only to new motor vehicles. Operational regulations and requirements applicable to "in service" vehicles are administered by the Federal Motor Carrier Safety Administration (FMCSA). In addition, individual states may have their own requirements setting minimum "in service" equipment and performance standards for heavy trucks. Moreover, and with direct applicability here, a manufacturer of motor vehicles or motor vehicle equipment has an obligation to remedy safety-related defects in its products. Pursuant to 49 U.S.C. '30118(c), a manufacturer of a motor vehicle or replacement must notify the National Highway Traffic Safety Administration (NHTSA) as well as owners, purchasers, and dealers if the manufacturer: (1) learns the vehicle or equipment contains a defect and decides in good faith that the defect is related to motor vehicle safety; or (2) decides in good faith that the vehicle or equipment does not comply with an applicable motor vehicle safety standard. In addition, the manufacturer must remedy the defect or noncompliance free of charge (49 U.S.C. ' 30120(a)). In this case, the failure of the Haldex brake systems constitutes a defect that is related to motor vehicle safety. The notification and remedy requirements of Chapter 301 are not generally applicable to suppliers of component parts that are then incorporated into items of motor vehicle equipment by an equipment manufacturer. In such instances, the responsibilities of the supplier are not governed by Chapter 301 and would be determined under other applicable law, such as contract law and the terms of any agreements between the supplier and the equipment manufacturer. I hope you find this information useful. If you have any further questions regarding this matter, please feel free to contact Otto Matheke in the Office of the Chief Counsel at (202) 366-2992. Sincerely, ref:121 |
2001 |
Request an Interpretation
You may email your request to Interpretations.NHTSA@dot.gov or send your request in hard copy to:
The Chief Counsel
National Highway Traffic Safety Administration, W41-326
U.S. Department of Transportation
1200 New Jersey Avenue SE
Washington, DC 20590
If you want to talk to someone at NHTSA about what a request for interpretation should include, call the Office of the Chief Counsel at 202-366-2992.
Please note that NHTSA’s response will be made available in this online database, and that the incoming interpretation request may also be made publicly available.