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
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ID: aiam4327OpenMr. Daniel Rosendahl, Vice-President, Target Import, Valkenburgerstraat 16, 1011LZ, Amsterdam, Netherlands; Mr. Daniel Rosendahl Vice-President Target Import Valkenburgerstraat 16 1011LZ Amsterdam Netherlands; Dear Mr. Rosendahl: On March 10 the agency received your petition of November 14, 1986, fo temporary exemption of the Target kit car from several Federal motor vehicle safety standards. As you have described your operation, 'these vehicles utilize remanufactured/reinforced, engines/chassis of 1960-1980 year, model Citroen 2CV, AMI, and DYANE, and then are equipped with brand new re-inforced bodies of Fiberglass and/or metal.'; The Federal motor vehicle safety standards issued under the Nationa Traffic and Motor Vehicle Safety Act apply to vehicles from time of manufacture up to their sale to first purchasers for purposes other than resale. Once a vehicle is in use, Federal standards no longer apply to it (other than a prohibition against rendering inoperative safety equipment originally installed). In our interpretations to kit car manufacturers, we have advised them that installation of a new body on a chassis of a vehicle previously in use does not create a 'new' vehicle subject to the Federal safety standards, and such vehicles are subject only to the laws of the individual States where they will be sold, licensed, and operated. This appears to be the exact situation represented by your fabricating operations. Because a 'used' vehicle is not legally required to comply with the safety standards, there is no obligation that its manufacturer must meet, and hence, petitions for temporary exemption from the safety standards are moot.; However, under the Act, there is na obligation upon any perso importing a 'used' vehicle into the United States to bring it into compliance with all safety standards that would have applied to it at the time of its manufacture had it been manufactured in the United States. It appears appropriate to establish the date of manufacture as that of the original chassis. Thus, the importer of a Target vehicle consisting of a body manufactured in 1987, and placed upon a chassis manufactured in 1980, would be required to bring it into compliance with all Federal safety standards in effect in 1980. On the other hand, if the chassis of the Target were manufactured before January 1, 1968, there would be no obligation to conform to Federal vehicles standards as none applied before that date (We view equipment standards somewhat differently, the tires, wheel covers, brake hoses, brake fluid, lamps, glazing, and seat belts if any, on otherwise uncovered vehicles must meet standards in effect at time of importation).; In summary, there is no legal requirement that the manufacturer of th Target comply with the Federal motor vehicle safety standards. There is a requirement that the importer of such a vehicle bring the car into compliance with all such Federal safety standards that may have been in effect when the chassis was manufactured. But there are no provisions under which an importer of a Target can petition for exemptions from the safety standards. The exemption authority that exists relates to new motor vehicles, and is available only to the original manufacturer of such vehicles. It does not extend to vehicles that the agency considers 'used', nor to importers for resale who are not the original manufacturers.; Sincerely, Erika Z. Jones, Chief Counsel |
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ID: aiam0364OpenMr. George Talin, President, Lynd-Talin Tire Company, 3000 Cherry Avenue, Long Beach, CA 90807; Mr. George Talin President Lynd-Talin Tire Company 3000 Cherry Avenue Long Beach CA 90807; Dear Mr. Talin: This is in reply to your letter of May 10, 1971, concerning the Tir Identification and Record Keeping Regulation. Please accept my apology for not responding earlier.; The National Highway Traffic Safety Administration considers eac enforcement case on an individual basis. If a retreader could demonstrate that good faith attempts had been made to obtain the tin plate by May 22, 1971, and due to circumstances beyond his control he was unable to mark tires manufactured after May 22, 1971, with the required information, we would certainly take this into consideration before beginning any enforcement action.; Sincerely, Lawrence R. Schneider, Acting Chief Counsel |
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ID: aiam2359OpenMr. John Turnbull, Celanese Fibers Marketing Company, Charlotte, NC; Mr. John Turnbull Celanese Fibers Marketing Company Charlotte NC; Dear Mr. Turnbull: This responds to your March 19, 1976, recommendation that paragrap S5.1(e) of Standard No. 209, *Seat Belt Assemblies*, be amended to clarify that the temperature specified in the resistance to light' test procedure is intended to be black panel' temperature rather than bare bulb' temperature.; The procedures outlined in Standard No. 209 for the resistance t light' test were adopted from the Bureau Standard's procedures for testing seat belts. The standard was developed by an industry and government group, which included Celanese Fibers, as a simplification and improvement of the A.S.T.M. Designation E42-64 procedure. The resistance to light' test was established to test nylon webbing, which was the standard material used in seat belt webbing at that time.; We recognize, however, that the industry now uses dacron and polyeste materials in seat belt webbing, and that the Standard 209 test procedure developed to test nylon does not give meaningful results for these new materials. Therefore, the National Highway Traffic Safety Administration does not enforce the requirements of paragraph S5.1(e) of Standard No. 209 in the case of seat belt webbing made of dacrons and polyesters, and will not until appropriate testing procedures can be developed and incorporated in the standard for these new materials.; Procedures for testing systems containing materials other than nylo are under development and we plan to initiate rulemaking to incorporate these procedures into standard(sic) 209. You should understand that our commencement of a rulemaking proceeding does not signify that the rule in question will be issued. A decision as to the issuance of the rule is made on the basis of all available information developed in the course of the rulemaking proceeding, in accordance with statutory criteria.; We would appreciate any data you may be able to provide regardin colorfastness tests for fabrics other than nylon.; Sincerely, Stephen P. Wood, Assistant Chief Counsel |
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ID: aiam5166OpenMr. Raymond S. Byers Engineering Manager, Research, Testing, and Certification Utilimaster Motor Corporation 65598 State Road #19 P.O. Box 860 Wakarusa, IN 46573; Mr. Raymond S. Byers Engineering Manager Research Testing and Certification Utilimaster Motor Corporation 65598 State Road #19 P.O. Box 860 Wakarusa IN 46573; "Dear Mr. Byers: This letter responds to your inquiry regarding th alternate placement of a vehicle certification label in your 'Aeromate' van. I apologize for the delay in responding. As you noted in your letter, 49 CFR 567.4 requires that a motor vehicle manufacturer affix a certification label to each vehicle it makes, and permits the manufacturer to place the label in any one of the places listed in that provision. If none of the listed locations is practicable, 567.4 directs the manufacturer to suggest an alternate position for the affixed label, and to request National Highway Traffic Safety Administration (NHTSA) approval for that position. You explain in your letter that in your 'Aeromate' vehicle, the driver's door slides between an inner and outer metal panel, thus making it impossible to affix the label to the hinge pillar, door-latch post, or the door edge that meets the door-latch post. Based on the photographs you included with your letter, affixing the label to the inside of the driver's side door would be unacceptable because, when opened, the door slides between the two metal panels. Thus, when the door is in the open position, the label would be obscured from the view of any observer. You propose installing the label on the inner metal panel in front of the driver's side door opening, to the left of the driver's legs under the instrument panel, and include photographs showing the label affixed to the proposed position. You state, and your photographs appear to confirm, that the location would be visible from the driver's position, and for inspection by officials. In directing a manufacturer to put its certification label in those places set out in 567.4, NHTSA's purpose is to make these labels easy to see and read. Based on the information you supplied, the agency determines that for this particular vehicle design, installing the certification label as you propose will facilitate seeing and reading the label. On the other hand, placing the label as specified in 567.4 may not be practicable and might interfere with unobstructed viewing of the label. Therefore, on the condition that your company's label complies in all other respects with 567.4, NHTSA grants your request to install the certification label on the inner metal panel in front of the driver's door opening as shown in the photographs that you provided to us. I hope this information is helpful. If you have any further questions, feel free to contact David Elias of my office at the above address or by phone, at (202) 366-2992. Sincerely, John Womack Acting Chief Counsel"; |
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ID: aiam1826OpenHonorable Roman L. Hruska, United States Senate, Washington, DC 20510; Honorable Roman L. Hruska United States Senate Washington DC 20510; Dear Senator Hruska: I would like to respond to your February 19, 1975, request fo consideration of Mr. R. L. Herman's views on Standard No. 121, *Air brake systems*. Mr. Herman objects that the National Highway Traffic Safety Administration (NHTSA) may have ignored the majority of comments submitted in response to its recent proposal to delay implementation of the standard, that implementation of the standard should be reconsidered by an activity other than NHTSA, and that the new brake systems may be less safe than existing systems.; Standard No. 121 was issued as a final rule in February 1971. NHTS realized that the economic situation in the automotive industry this past fall might justify a postponement of the scheduled January 1, 1975, effective date. In the short time available for review of the standard before its effective dates, the NHTSA issued a proposal, received comments, and made its decision.; NHTSA concluded that net economic benefit would not be derived fro postponement. The decision was based on evaluation of all the comments, including those concerning the standard's immediate short-term impact on the national economic picture. An important factor in this case was the imminence of the standard and the degree to which financial and employment commitments were made.; As you may know, the President has directed (by Executive Order 11821 that each Federal agency consider the inflation impact of its regulatory actions. At the time of the NHTSA decision on December 31, 1974, final criteria and procedures for implementation of the Order were not yet established. NHTSA did, however, analyze economic effects of its proposal. NHTSA has committed itself publicly to continue monitoring the effectiveness of its standard in accordance with its statutory mandate and the President's direction, with a view to identifying any modifications that would lower costs while achieving comparable levels of safety.; An independent evaluation of the standard and its implementation by th Office of the Secretary (of the Department) was recently conducted, and this study supports the NHTSA decision. A copy of a letter regarding that evaluation is enclosed, and it discusses in detail Mr. Herman's concern about the field testing of the new braking components.; Thank you for your interest in motor vehicle safety. Sincerely, William T. Coleman, Jr. |
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ID: aiam0734OpenMr. Erwin Strasmich, Vice-President, Ross Matthews Corporation, East Warren Street, Fall River, MA, 02722; Mr. Erwin Strasmich Vice-President Ross Matthews Corporation East Warren Street Fall River MA 02722; Dear Mr. Strasmich: This is in reply to your letter of May 19, asking whether elasti fabric you manufacture must meet the requirements of Motor Vehicle Safety Standard No. 302, 'Flammability of Interior Materials' (49 CFR 571.302). You state that the fabric is under one inch wide, is tunneled and covered in automobile map pockets and similar accessories, and is not exposed in the finished product.; Paragraph S4.1 of Standard No. 302 (copy enclosed) lists the component of motor vehicles that must meet the burn rate requirements. Whether your elastic is required to meet these requirements depends upon whether it is incorporated into any of these enumerated components. We would consider, for example, a map pocket attached to the inside of a vehicle door to be part of a door 'trim panel,' and consequently subject to the standard. If your material is used in any component listed in S4.1, it would be required to meet the standard's requirements when tested as part of the component.; Yours truly, Richard B. Dyson, Assistant Chief Counsel |
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ID: aiam2709OpenMr. Terry A. Lowe, Vice President, Lowe Machine Company, State Route #2, Rural Route #3, Oak Harbor, OH 43449; Mr. Terry A. Lowe Vice President Lowe Machine Company State Route #2 Rural Route #3 Oak Harbor OH 43449; Dear Mr. Lowe: This responds to your October 12, 1977, letter asking what regulation apply to you in your capacity as an alterer of motor vehicles. The National Highway Traffic Safety Administration (NHTSA) promulgates safety standards for motor vehicles. The agency requires persons who alter motor vehicles prior to their first purchase for purposes other than resale to attach a label to each vehicle indicating that it continues to comply with all applicable safety standards. Therefore, if the modification that you intend to perform occurs prior to the first purchase of the vehicle for purposes other than resale, you would be required to attach such a label. I am enclosing a copy of Part 567, *Certification* (Volume 49 of the Code of Federal Regulations, Part 567) which addresses the responsibilities of vehicle alterers.; If you modify vehicles after their first purchase for purposes othe than resale, then you need not attach a certification or alterer's label. However, section 108(a)(2)(A) of the National Traffic and Motor Vehicle Safety Act of 1966 (the Act) (15 U.S.C. 1381 *et seq*.) prohibits any repair business, dealer, distributor, or manufacturer from rendering inoperative any device or element of design installed on a vehicle in compliance with a safety standard. If your manufacturing operation affected the compliance of any aspect of the vehicle with safety standards in effect on the date of the vehicle's manufacture, you would be in violation of the Act and subject to civil penalties prescribed thereunder.; Sincerely, Joseph J. Levin, Jr., Chief Counsel |
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ID: aiam5536OpenMr. Valter Sforca 84 Thomas Street Newark, NJ 07114; Mr. Valter Sforca 84 Thomas Street Newark NJ 07114; Dear Mr. Sforca: This is in reply to your letter of April 20, 1995 asking if there is a regulation that applies to the importation of an 'air equalizer for tire pressure.' Although you have not described your device, there are no Federal motor vehicle safety standards that apply to equipment installed in motor vehicles that regulate the air pressure of tires. If you are asked by the U.S. Customs Service to execute an HS-7 Declaration Form at the port of entry, you may check Box 1, declaring that the equipment was manufactured on a date when no applicable Federal motor vehicle safety standard was in effect. Because this device is motor vehicle equipment, and because you apparently would be its importer, you would be responsible for notifying buyers and recalling it if either you or we decided that it contained a safety related defect. We don't understand your phrase 'the system have a safety valve for the air brakes the truck, for a properly stop'. However, if the 'air equalizer' is installed by a manufacturer, distributor, dealer, or motor vehicle repair business, that person must not knowingly make inoperative any part of a truck's air brake system by installing the air equalizer. I am enclosing a copy of a letter concerning what appears to be a similar device, which will explain this more fully. If you have any further questions, you may refer them to Taylor Vinson of this Office, with whom you spoke previously (202-366-5263). Sincerely, John Womack Acting Chief Counsel Enclosure; |
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ID: aiam5218OpenMr. Kenneth E. Ross 752 Hillpine Terrace Atlanta, GA 30306; Mr. Kenneth E. Ross 752 Hillpine Terrace Atlanta GA 30306; "Dear Mr. Ross: This responds to your letter requesting informatio about a product that attaches to an automobile's back window. In a telephone conversation with Marvin Shaw of my staff, you stated that your product is a two to three inch high LED sign that extends along most of the rear window. The sign displays any message that the driver chooses. While we do not have information about State or local laws, I am pleased to have this opportunity to explain the applicability of Federal law on your product. By way of background information, NHTSA is authorized to issue Federal Motor Vehicle Safety Standards that set performance requirements for new motor vehicles and items of motor vehicle equipment. NHTSA does not, however, approve or certify any vehicles or items of equipment. Instead, the National Traffic and Motor Vehicle Safety Act ('Safety Act') establishes a 'self- certification' process under which each manufacturer is responsible for certifying that its products meet all applicable Federal motor vehicle safety standards (FMVSSs). In response to your question, NHTSA currently has no FMVSSs that directly apply to the product you wish to manufacture. I note, however, that there are other Federal requirements that indirectly affect you and your product. Under the Safety Act, your product is considered to be an item of motor vehicle equipment. As a manufacturer of motor vehicle equipment, you are subject to the requirements in 151-159 of the Safety Act concerning the recall and remedy of products with safety related defects. I have enclosed an information sheet that briefly describes those responsibilities. In the event that you or NHTSA determines that your product contains a safety-related defect, you would be responsible for notifying purchasers of the defective equipment and remedying the problem free of charge. Automotive accessory equipment that a dealer adds before sale of a vehicle must not create a noncompliance with the FMVSSs to which the vehicle manufacturer has certified compliance. For instance, your LED sign should be mounted so that it does not block the field of view required by FMVSS No. 111, Rearview Mirrors. Similarly, for the vehicle to remain in compliance, your system must not impair the effectiveness of the lighting equipment required by FMVSS No. 108, Lamps, Reflective Devices, and Associated Equipment. In particular, the placement of your sign might impair the effectiveness of the center highmounted stop lamp (CHMSL) if it can be operated simultaneously with the CHMSL or at a time when the turn signals are flashing. In addition, manufacturers, distributors, dealers, and motor vehicle repair businesses are subject to 108(a)(2)(A) of the Safety Act, which states: 'No manufacturer, distributor, dealer, or motor vehicle repair business shall knowingly render inoperative ... 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 ....' It is conceivable that your product, when placed on a vehicle's rear window, could 'render inoperative' the vehicle's ability to comply with FMVSS No. 108 and FMVSS No. 111. Persons in the aforementioned categories that install your product must ensure that such installation does not render inoperative the safety protection provided by the applicable standards. Specifically, your product should be mounted so that it does not interfere with the CHMSL or turn signal lamps nor block the field-of-view required by FMVSS No. 111. The 'render inoperative' prohibition of 108(a)(2)(A) does not apply to the actions of vehicle owners in adding to or otherwise modifying their vehicles or items of motor vehicle equipment. Thus, if your product were placed on a rear window by the vehicle owner, then the render inoperative provision would not apply. Nevertheless, in the interest of safety, you should ensure that your product does not adversely affect a vehicle's rear lamps or rearward visibility. We are unable to advise you as to whether the laws of any State address this topic. You should consult the American Association of Motor Vehicle Administrators for an opinion. Its address is 4600 Wilson Boulevard, Arlington, Va. 22203. I hope you find this information helpful. If you have any other questions, please contact Marvin Shaw of my staff at this address or by phone at (202) 366-2992. Sincerely, John Womack Acting Chief Counsel Enclosure"; |
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ID: aiam2027OpenMr. Jerry Toner, Consultant, Transportation, Traffic & Safety, Superintendent of Public Instruction, Old Capitol Bldg., Olympia, WA 98504; Mr. Jerry Toner Consultant Transportation Traffic & Safety Superintendent of Public Instruction Old Capitol Bldg. Olympia WA 98504; Dear Mr. Toner: This is in reply to your letter of July 15, 1975, to Mr. J. E. Leysat of this agency asking whether the State of Washington's proposed school bus light warning system conflicts with S4.1.4(b)(ii) of Federal Motor Vehicle Safety Standard No. 108.; That section requires an eight lamp signal system to be wired 'so tha the amber signal lamps are activated only by manual or foot operation, and if activated, are automatically deactivated and red signal lamps automatically activated when the bus entrance door is opened.' Under the system Washington proposes, when a school bus stops, a 'stop paddle sign' is extended by the operator, activating 'a switching system which will terminate the yellow flashing lights and start the red flashing lights,' before the door is opened.; Under the system you describe, the termination of the yellow lamps an activation of the red ones is dependent upon the operator extending the stop paddle sign. Should the operator forget to extend the sign, it does not appear that the system required by S4.1.4 would operate automatically when the door is opened. We therefore conclude that in order to meet S4.1.4 your school buses must be equipped with an override switch that would deactivate the amber lamps and activate the red ones when the door is opened, in the event that the stop paddle sign has not been extended.; Sincerely, Frank A. Berndt, Acting Chief Counsel |
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.