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: nht71-4.32OpenDATE: 10/26/71 FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA TO: Rex Chainbelt Inc. TITLE: FMVSR INTERPRETATION TEXT: This is in response to your letter of October 8, 1971, in which you expressed concern over the implications of the gross axle and gross vehicle weight ratings to appear on certification labels, beginning January 1, 1972. You requested our assurance that "the GVWR will not be interpreted so strictly as to make liable the manufacturer whose body, if loaded to its nominally rated capacity, would exceed the GVWR indicated on the certificate." The GVWR and GAWR values are, within limits, to be supplied by the vehicle manufacturer based on his own knowledge of the vehicle's capacity. In the amendment to the certification regulations published October 8, 1971 (36 F.R. 19593), a requirement was added that the GVWR figure "shall not be less than the sum of unloaded vehicle weight, rated cargo load, and 150 pounds times the vehicle's designated seating capacity." From the standpoint of the regulation itself, the only other limit on GVWR would be that it should not be more than the sum of the GAWR's (although it may be less), since otherwise the vehicle would obviously be supplied with axle systems inadequate for its carrying capacity. Thus, the GVWR must not be less than a figure that reflects the full "rated cargo load" of the completed vehicle. Obversely, if you supply a rated cargo load, the weight of the vehicle when carrying that load must not exceed the GVWR. If you supply no rated cargo load, but only the volumetric capacity, the capacity would not on its face lead to a violation of the certification regulations, since as you note the specific weight of the material carried varies considerably. You should be aware, however, that completing the vehicle so that its apparent carrying capacity exceeds the stated weight ratings may create some risks of liability beyond the certification regulations themselves. If, for example, the vehicle suffers a hazardous malfunction in use that can be traced to overloading of its axle systems, its manufacturer may be liable both under the defect provisions of the National Traffic and Motor Vehicle Safety Act (section 113, 15 U.S.C. 1402) and under common-law product liability doctrines. In such a case, the manufacturer of the incomplete vehicle might avoid liability, leaving it all on the final-stage manufacturer, by pointing out that the design of the vehicle as completed led the user to exceed the GVWR and GVWR furnished with the incomplete vehicle. |
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ID: nht71-4.33OpenDATE: 10/26/71 FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA TO: Blue Bird Body Company TITLE: FMVSR INTERPRETATION TEXT: This is in reply to your letter of September 13, 1971, concerning the Defect Reports regulations (49 CFR Part 573). You request a ruling concerning S573.7, which requires manufacturers to submit a copy "of all notices, bulletins, and other communications, other than these required to be submitted under #573.4(c)(8), sent to more than one dealer or purchaser of his vehicles regarding any defect, whether or not safety related, in such vehicles." You ask wether this requirement includes letters that your company writes that are of a personal nature concerning possible defects, when the letters deal with more than one item, but have at least one item in common. If those letters are included in the requirement, you request that we specify a time span for which you would be responsible. The intent of S573.7 is for manufacturers to provide the NHTSA with certain information each time a defect other than a defect under #573.4(c)(8) is found to exist in more than one vehicle. Thus, assuming the defect is not one on which information has been submitted pursuant to #573.4(c)(8), you may satisfy the requirement of S573.7 by submitting a copy of any one letter that pertains to a defect found in more than one vehicle, as long as the letter is approximately marked so that we can determine for which defect it is being submitted. The regulation does not limit the time span for which manufacturers are responsible, and manufacturers must be sufficiently familiar with their repair programs so that if a defect appears at two or more points in time, the necessary information can be submitted. |
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ID: nht71-4.34OpenDATE: 10/29/71 FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA TO: Rosenstein; Livingston; Fist & Rengold TITLE: FMVSR INTERPRETATION TEXT: This is in reply to your letter of October 12, 1971, concerning the Defect Reports regulations (49 CFR Part 573), published February 17, 1971 (36 F.R. 3054), in which you request an interpretation of "produced" as used in @ 573.5(b) of the regulations. You state you believe that the term refers only to vehicles that have been invoiced and sold, or ready to be sold to a customer, and ask whether this would include vehicles retained by the manufacturer for demonstration or consignment purposes. As used in the regulation "produced" refers to the date of the vehicle's manufacture. The agency takes the position that a vehicle is manufactured when the final stage of manufacture at its place of main assembly is completed. Thus, neither invoicing for sale nor sale are the points in time at which production is determined under the regulation. With reference to whether demonstration or consignment vehicles must be included, any vehicle manufactured for use on the public roads must be included, and this includes both demonstration and consignment vehicles as those terms are generally understood. Only vehicles that are not to be used on the public roads, such as, for example, those manufactured or chosen for crash testing, need not be reported. |
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ID: nht71-4.35OpenDATE: 10/29/71 FROM: AUTHOR UNAVAILABLE; R. L. Carter; NHTSA TO: Joseph Lucas (Electrical), Ltd. TITLE: FMVSS INTERPRETATION TEXT: This is in reply to the petition of Joseph Lucas (Electrical) Ltd. dated October 13, 1971, for rulemaking to amend Federal Motor Vehicle Safety Standard No. 108, Lamps, Reflective Devices, and Associated Equipment. Specifically, you have asked for an amendment of paragraph S4.1.2 either to reduce the(Illegible Word) test cycle of the warpage test for backup and stop lamps from 10 minutes to 5 minutes, or to conduct the test for these lamps using a continuously flashing filament. Petitions for reconsideration of the 10 minute heat test cycle were filed following amendment of Standard No. 108 on October 31, 1970 (35 F.R. 16840). These petitions were denied on February 3, 1971 (36 F.R. 1896), because the Traffic Safety Administration had determined that the 10-minute cycle is appropriate in view of the frequency of usage of stop and backup lamps. I enclose a copy of the denial. The Administrator has determined that your petition contains no new information such as to merit rulemaking on this issue, and we must therefore respectfully deny your petition. |
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ID: nht71-4.36OpenDATE: 11/01/71 FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA TO: Renault, Inc. TITLE: FMVSS INTERPRETATION TEXT: We regret the continuing difficulty of communication concerning paragraph S4.1.2.2 of Standard No. 208. As we understand the question stated in your letters of September 14 and October 11, 1971, you have asked whether a passenger car that has passive 3-point belts at the front positions and that conforms to S4.1.2.2(b) by use of these belts will also have to have Type 1 belts at those positions and conform to S4.1.2.2(c). It was our intent in adopting the passive seat belt requirement, S4.5.3 to permit manufacturers to substitute a Type 1 passive assembly or a Type 2 passive assembly with detachable or non-detachable shoulder belt for any assembly under an option that specifies a Type 1 assembly or a Type 2 assembly with detachable shoulder belt. Therefore, even though the assemblies specified under S4.1.2.2 are required to be Type 1 or Type 2 with detachable shoulder belts, a passive assembly used in place of any belt under S4.1.2.2 could have a non-detachable shoulder belt. In the light of questions rained by Renault and others, we are considering an amendment to S4.5.3 to clarify this point. With specific reference to your question, a 3-point passive assembly may be used to meet the passive protection requirements of S4.1.2.2(b). Such an assembly(Illegible Word) not have a detachable shoulder belt. Since S4.5.3 provides that it may be used in place of a Type 1 assembly, the passive assembly may be used in its 3-point configuration to meet the requirements of S4.1.2.2(c). The effect of using a 3-point passive assembly to meet subparagraph (c) is to make the test requirements of (b) and (c) identical. Please advise us if further clarification is necessary. |
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ID: nht71-4.37OpenDATE: 11/02/71 FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA TO: REBCO TITLE: FMVSR INTERPRETATION TEXT: This is in reply to your letter of October 24, 1971, concerning the retention of records of the names and addresses of first purchasers of retread tires that you manufactured prior to October 13, 1971, the date you went out of the retread business. Under the Tire Identification and Record Keeping Regulation you are required to maintain the names of first purchasers three years from the time the sale is reported to you or your designee. Therefore, as to those tires manufactured between May 22, 1971 and the date you went out of business, October 24, 1971, you are required to maintain, or have maintained for you the names and addresses of the first purchasers for three years after this information is recorded by you or your designee. |
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ID: nht68-4.18OpenDATE: 09/18/68 FROM: AUTHOR UNAVAILABLE; Eugene B. Laskin; NHTSA TO: Department of California Highway Patrol PAR=LOCATION TITLE: FMVSR INTERPRETATION TEXT: Your letter of August 19, 1968, addressed to Mr. David A. Fay, of the National Highway Safety Bureau has been forwarded to my office for reply. The original list of definitions of vehicles was published in the Federal Register as part of a Notice of Proposed Rule Making dated December 3, 1966. Comments were requested from interested parties. Subsequently, the definition of a multipurpose vehicle as added to the Federal Motor Vehicle Safety Standards in response to a number of comments received from industry requesting a different category for certain utility vehicles. Under the previous classification, there were a number of special purpose vehicles which did not fit into any single category. It was agreed that certain types of motor vehicles, such as Dune Buggies, the Carryall, Travelall, Compact Van, Jeep Wagoneer, Ford Bronco, and Scout type vehicles comprised a hybid class of motor vehicle which possessed the characteristics of more than one of the motor vehicle categories previously established. The "special features" include such items as 4-wheel drive amphibious equipment. Due to the differences in body construction, load time requirements, and general vehicle purpose, it was not considered reasonable to require those dual purpose vehicles designed to carry ten persons or less to meet all of the passenger car requirements, as would have been required by the Notice. For those reasons, the new category of "multipurpose passenger vehicle" use added to Section 245(b). Your interest in the automotive safety program of the Federal Highway Administration is greatly appreciated. |
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ID: nht68-4.19OpenDATE: 09/19/68 FROM: AUTHOR UNAVAILABLE; Howard A. Heffron; NHTSA TO: Government of the Virgin Islands of the United States TITLE: FMVSR INTERPRETATION TEXT: This is in response to your letter of June 10 to the Federal Highway Administrator with reference to implementation of 19 C.F.R. S12.80, in the Virgin Islands. You have informed us that your analysis of S12.80(b)(1) which begins "Any vehicle or equipment item offered for importation into the customs territory of the United States. . . ." leads you to believe that these regulations are not applicable to the Virgin Islands, which are not within the customs territory of the United States. These regulations were issued jointly by the Department of the Treasury and the Department of Transportation pursuant to section 108 of the National Traffic and Motor Vehicle Safety Act of 1966. Section 102 (8) of this Act specifically includes the Virgin Islands in the definition of "State" so that the Act applies to the Islands. Since the Act applies, regulations issued under the Act also apply by their own force. It is our understanding that these regulations have been implemented in AmericanSamoa and Guam, also outside the customs territory of the United State by Executive Order of the respective governors. We believe that Governor Palewonsky should do the same, substituting the word "Virgin Islands" for "customs territory", and an Island enforcement agency in lieu of the Bureau of Customs, and making such other minor changes as appear called for by local conditions. The alternative, of course, is for the Secretary of Transportation to issue a separate set of regulations applicable only to the Virgin Islands. We would appreciate knowing what action will be taken by Governor Paiswonsky, and which Island agency will be responsible for enforcing the regulations. |
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ID: nht68-4.2OpenDATE: 08/20/68 FROM: AUTHOR UNAVAILABLE; Charles A. Baker; NHTSA TITLE: FMVSS INTERPRETATION TEXT: Thank you for your letter of July 24, 1968, to Mr. George C. Nield, concerning the method of operating school bus signal lamps as required by Motor Vehicle Safety Standard No. 108. Paragraph S3.1.3.2(b)(2) of Standard No. 108 requires that the system of red and amber signal lamps shall be wired so that the red signal lamps are automatically energized, and the amber signal lamps are automatically de-energized, when the bus entrance door is opened. Paragraph S3.1.2 of the standard does not permit the installation of an additional lamp, reflective device or associated equipment if it impairs the effectiveness of the required equipment. Therefore, the criteria for determining the compliance of an additional manual switch for controlling operation of the signal lamps is whether or not the manual switch would impair the effectiveness of the required automatic entrance door switch. A manual switch which overrides the entrance door switch only while the entrance door is closed does not appear to impair the effectiveness of the required automatic switch. However, a manual switch which controls operation of the signal lamps while the entrance door is open would definitely impair the effectiveness of the automatic switch. With respect to the requirements of Standard No. 108, I must point out that this Bureau does not issue approvals on items of lighting equipment or on vehicle designs incorporating this equipment. Therefore, the above comments are for your information only and in no way relieve the vehicle manufacturer from his responsibility for certifying that the assembled vehicle meets the requirements of the standard. Thank you for writing. |
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ID: nht68-4.20OpenDATE: 08/21/68 FROM: AUTHOR UNAVAILABLE; Robert M. O'Mahoney; NHTSA TO: Bugetta Inc. TITLE: FMVSR INTERPRETATION TEXT: With reference to your letter of August 14 and its enclosed specification sheet covering the Bugetta, this vehicle appears to be a "multipurpose passenger vehicle" for purpose of the Federal motor vehicle safety standards since it is constructed with features for ocasional off road use. Your understanding of the applicability of standards to multi-purpose passenger vehicles is correct. We concur with your view that compliance with Standard No. 103 (Windshield Defrosting and Defogging) is a meaningless requirement for a vehicle with no top or windows. BUGETTA INC. August 14, 1968 U.S. Department of Transportation Federal Highway Administration Attention: Robert M. O'Mahoney Responding to letter of July 31st from Mr. David Schmeltzer, we enclose general specifications and line drawing of the vehicle which is constructed with racing components and aircraft quality fittings throughout. The special features of this motor vehicle that are contained for occasional off-road operations are: a. Telescopic shocks which can raise chassis approximately 18" off the ground to traverse rough terrain, water, etc. b. Removable fiberglass body (8 pit pins) for use in mud, etc. Vehicle completely functionable with body removed. c. Metal protective covering under entire vehicle for deflecting rocks, twigs, etc. d. Off highway tires as standard item. e. Roll bar for off highway and racing protection. Safety Standards complied with: 102, 104, 106, 107, 108, 109, 111, 205, 209, 211. It was felt that the following standards did not apply primarily due to the multipurpose classification or for additional reasons given: 101 - Not applicable. 103 - Impossible requirement without top and side windows to vehicle. 105 - Not applicable. 110 - Not applicable. 112 - Not applicable. 113 - No hood, therefore not applicable. 114 - Not applicable. 201 - Not applicable. 202 - Not applicable. 203 - Not applicable. 204 - Not applicable. 206 - Not applicable. No doors. 207 - Not applicable. 208 - Not applicable. 210 - Not applicable. 301 - Not applicable. Please review and let us know if further information is desired. R. J. Hart Enclosure |
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.