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: aiam2641OpenMr. Samuel W. Alderson, President, Humanoid Systems, 747 East 223rd Street, Carson, CA 90745; Mr. Samuel W. Alderson President Humanoid Systems 747 East 223rd Street Carson CA 90745; Dear Mr. Alderson: This responds to your June 3, 1977, request for confirmation that 572.7(b) of Part 572, *Anthropomorphic Test Dummy* (49 CFR 572), specifies a minimum time period during which the pendulum used in testing may not reverse direction rather than an exact time.; Your interpretation is correct. The specification that the pendulu 'shall not reverse direction until T=123 ms' means that reverse travel must not occur earlier than 123 milliseconds after chordal displacement begins. The agency believes that this language can be improved and intends to clarify it at the next opportunity.; Sincerely, Joseph J. Levin, Jr., Chief Counsel |
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ID: 1983-1.49OpenTYPE: INTERPRETATION-NHTSA DATE: 05/03/83 FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA TO: Teledyne Continental Motors -- T.A. Eschbaugh, General Products Division TITLE: FMVSS INTERPRETATION ATTACHMT: 2/8/83 letter from Frank Berndt to Talbot Engineers Inc. TEXT:
Mr. T. A. Eschbaugh Teledyne Continental Motors General Products Division 76 Getty Street Muskegon, Michigan 49442
Dear Mr. Eschbaugh:
This responds to your letter of March 22, 1983, asking whether any Federal motor vehicle safety standard (FMVSS) specifies wiped area requirements for multipurpose passenger vehicles, trucks and buses. The answer to your question is no.
FMVSS No. 104, Windshield Wiping and Washing Systems, specifies requirements for windshield wiping and washing systems. As discussed in an enclosed letter of interpretation, while the standard applies to passenger cars, multipurpose passenger vehicles, trucks and buses, the standard's wiped area requirements only apply to passenger cars. Neither FMVSS No. 104 nor any other Federal motor vehicle safety standard specifies wiped area requirements for multipurpose passenger vehicles, trucks and buses.
Sincerely,
Frank Berndt Chief Counsel
(Enclosure omitted here.)
22 March, 1983
Chief Counsel for Legal Interpretation, NHTSA Subject: Clarification of Federal Motor Vehicle Safety Standard Requirement 104 Re: Title 49 Code of Federal Regulations 571.104 Paragraph S.2 and S.4.1.2
Dear Sir:
Paragraph S.2 of the above cited reference states that Requirement 104 applies to passenger cars, multipurpose passenger vehicles, trucks and buses. Paragraph S.4.1.2 specifies wiped area requirements for passenger cars. Multipurpose passenger vehicles, trucks and buses are not mentioned in Paragraph S.4.1.2. Question: Are wiped area requirements for multipurpose passenger vehicles, trucks and buses specified by FMVSS requirement? If these requirements are specified, what are the appropriate references?
Very truly yours,
TELEDYNE CONTINENTAL MOTORS General Products Division
T. A. Eschbaugh
TAE/js cc: Messrs. A. Saporito, E. Blackburne, R. Schuler, T. Schwallie |
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ID: nht72-1.26OpenDATE: 04/24/72 FROM: AUTHOR UNAVAILABLE; L. R. Schneider; NHTSA TO: National Tire Dealers & Retreaders Association, Inc. TITLE: FMVSS INTERPRETATION TEXT: This is in response to your letter of March 28, 1972, asking whether passenger car tires that have been reclassified, under Standard 109, as "Unsafe for Highway Use" because they do not conform to the standard may be sold with, or for use on, a vehicle other than a passenger car. For the reasons given below, our answer to your question is no. Section 108(a)(1) of the National Traffic and Motor Vehicle Safety Act states that: "No person shall manufacture for sale, sell, offer for sale, or introduce or deliver for introduction in interstate commerce, or import into the United States, any motor vehicle or item of motor vehicle equipment manufactured on or after the date any applicable Federal motor vehicle safety standard takes effect under this title unless it is in conformity with such standard except as provided in subsection (b) of this section." (Emphasis supplied.) We presume that the argument for allowing use of a nonconforming passenger car tire on another type of vehicle (in your case a boat trailer) would be that by so using the tire, it ceases to be a "tire for use on passenger cars" in the words of the application section of Standard 109, that the standard does not apply to it, and since there is currently no standard for tires on vehicles other than passenger cars, anything may be used on such vehicles. We would reject this argument. We interpret Standard 109 as applying to tires that are designed and produced for use on passenger cars, and in this view a tire so designed and produced does not become something else because it is ultimately used for a different purpose. The effect of section 108, then, is not merely to prohibit nonconforming passenger car tires from being sold on passenger cars, but to prohibit them from being sold at all, as "motor vehicle equipment." As an entirely separate matter, any reclassified tire sold as motor vehicle equipment would be presumed to contain a safety-related defect within the meaning of sections 111 and 113 of the Act. |
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ID: aiam1072OpenMr. Terry Coleman, Senior Project Coordinator/Federal Codes, Holiday Rambler Corporation, Engineering Department, 1055 East Lincoln Street, Nappanee, IN 46550; Mr. Terry Coleman Senior Project Coordinator/Federal Codes Holiday Rambler Corporation Engineering Department 1055 East Lincoln Street Nappanee IN 46550; Dear Mr. Coleman:#This is in reply to your letter of March 20, 1973, t this agency asking about the applicability of paragraph S4.1.2 of Federal Motor Vehicle Safety Standard No. 104 to vehicles other than passenger cars.#Your understanding is correct that the standard establishes wiped area requirements only for passenger car windshields. The NHTSA is engaged in research with the intent of establishing an all- weather visibility standard, combining Standards No. 103 and 104, that would among other things extend the windshield wiped area requirements to vehicles other than passenger cars. However, it is not possible to say when we will issue a rulemaking proposal on this subject.#Sincerely, Richard B. Dyson, Assistant Chief Counsel; |
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ID: 2170yOpen The Honorable Bud Shuster Dear Mr. Shuster: Thank you for your inquiry on behalf of your constituent, Mr. Lester Hoover. Mr. Hoover requested information about laws that cover the branding of tires that are not first quality. In addition, he asked whether there is any way to apply such a law to other consumer goods such as batteries. This inquiry has already been referred to the Federal Trade Commission (FTC), which sent you a letter dated October 16, 1989 explaining its tire labeling regulations. The FTC's letter also indicated that this agency's tire labeling regulations might be of interest to Mr. Hoover. Let me begin by explaining that the National Highway Traffic Safety Administration has promulgated regulations related to tires. In particular, Federal Motor Vehicle Safety Standard No. 109, New Pneumatic Tires, applies to new tires for use on passenger cars, Standard No. 119, New Pneumatic Tires for Vehicles Other Than Passenger Cars, applies to new tires for use on vehicles other than passenger cars, Standard No. 117, Retreaded Pneumatic Tires, applies to retreaded tires for use on passenger cars, and Part 569, Regrooved Tires, applies to all regrooved tires. Each of these regulations includes some labeling requirements. The National Traffic and Motor Vehicle Safety Act requires that every manufacturer certify that each of the tires it produces complies with these standards, including the labeling requirements. Thus, even a tire identified as something like "blemished" or "out-of-round" must be certified as complying with all provisions of the applicable safety standard(s). None of the regulations administered by this agency require, or establish any standards for, the identification of tires as something other than "first quality." If some Federal regulation exists that requires the identification of tires as something other than "first quality," it would be promulgated by the FTC under that agency's authority to regulate unfair and deceptive trade practices. If the FTC does not have any such regulation, I am not aware of any other Federal agency that would have authority in this area. Similarly, I am not aware of any such labeling regulations that could be applied to consumer goods such as batteries. I hope you find this information helpful. Please let me know if you have any further questions or concerns in this area. Sincerely,
Stephen P. Wood Acting Chief Counsel /ref:109#117#119 d:ll/20/89 |
1970 |
ID: aiam1997OpenMr. Carl Morton, County of Los Angeles Road Department, 5530 West 83rd Street, Los Angeles, California 90045; Mr. Carl Morton County of Los Angeles Road Department 5530 West 83rd Street Los Angeles California 90045; Dear Mr. Morton: Please forgive the delay in responding to your letter of April 28 1975, concerning tires used on pull brooms.; Federal Motor Vehicle Safety Standard No. 119, *New pneumatic tires fo vehicles other than passenger cars*, (copy enclosed), specifies labeling and performance requirements for all tires designated for use on pull brooms. This standard applies to all such tires manufactured on or after March 1, 1975. There is presently no requirement, however, that vehicles be equipped with tires conforming to the standard. the National Highway Traffic Safety Administration has proposed and is considering the issuance of a new Standard No. 120, *Tire Selection and Rims for motor vehicles other than passenger cars*, which would require all new pull brooms manufactured after its effective date to be equipped with tires conforming to Standard No. 119.; Yours truly, Frank Berndt, Acting Chief Counsel |
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ID: aiam1998OpenMr. Carl Morton, County of Los Angeles Road Department, 5530 West 83rd Street, Los Angeles, California 90045; Mr. Carl Morton County of Los Angeles Road Department 5530 West 83rd Street Los Angeles California 90045; Dear Mr. Morton: Please forgive the delay in responding to your letter of April 28 1975, concerning tires used on pull brooms.; Federal Motor Vehicle Safety Standard No. 119, *New pneumatic tires fo vehicles other than passenger cars*, (copy enclosed), specifies labeling and performance requirements for all tires designed for use on pull brooms. This standard applies to all such tires manufactured on or after March 1, 1975. There is presently no requirements, however, that vehicles be equipped with tires conforming to the standard. The National Highway Traffic Safety Administration has proposed and is considering the issuance of a new Standard No. 120, *Tire selection and rims for motor vehicles other than passenger cars*, which would require all new pull brooms manufactured after its effective date to be equipped with tires conforming to Standard No. 119.; Yours truly, Frank Berndt, Acting Chief Counsel |
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ID: nht89-3.40OpenTYPE: INTERPRETATION-NHTSA DATE: 11/20/89 FROM: STEPHEN P. WOOD -- ACTING CHIEF COUNSEL NHTSA TO: BUD SHUSTER -- U.S. HOUSE OF REPRESENTATIVES ATTACHMT: LETTER DATED 10/16/89 FROM DONALD S. CLARK -- FEDERAL TRADE COMMISSION TO CONGRESSMAN BUD SHUSTER; LETTER DATED 8/8/89 FROM CONGRESSMAN BUD SHUSTER TO THE DIRECTOR OF CONGRESSIONAL RELATIONS -- DEPARTMENT OF COMMERCE TEXT: Dear Mr. Shuster: Thank you for your inquiry on behalf of your constituent, Mr. Lester Hoover. Mr. Hoover requested information about laws that cover the branding of tires that are not first quality. In addition, he asked whether there is any way to apply such a law to o ther consumer goods such as batteries. This inquiry has already been referred to the Federal Trade Commission (FTC), which sent you a letter dated October 16, 1989 explaining its tire labeling regulations. The FTC's letter also indicated that this agen cy's tire labeling regulations might be of interest to Mr. Hoover. Let me begin by explaining that the National Highway Traffic Safety Administration has promulgated regulations related to tires. In particular, Federal Motor Vehicle Safety Standard No. 109, New Pneumatic Tires, applies to new tires for use on passenger cars, Standard No. 119, New Pneumatic Tires for Vehicles Other Than Passenger Cars, applies to new tires for use on vehicles other than passenger cars, Standard No. 117, Retreaded Pneumatic Tires, applies to retreaded tires for use on passenger cars, an d Part 569, Regrooved Tires, applies to all regrooved tires. Each of these regulations includes some labeling requirements. The National Traffic and Motor Vehicle Safety Act requires that every manufacturer certify that each of the tires it produces complies with these standards, including the labeling requirements. Thus, even a tire identified as something like "blemished" or "out-of-round" must be certified as complying with all provisions of the applicable safety standard(s). None of the regulations administered by this agency require, or establish any standards for, the identification of tires as something other than " first quality." If some Federal regulation exists that requires the identification of tires as something other than "first quality," it would be promulgated by the FTC under that agency's authority to regulate unfair and deceptive trade practices. If the FTC does not h ave any such regulation, I am not aware of any other Federal agency that would have authority in this area. Similarly, I am not aware of any such labeling regulations that could be applied to consumer goods such as batteries. I hope you find this information helpful. Please let me know if you have any further questions or concerns in this area. Sincerely, |
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ID: aiam1598OpenMr. J. A. Brown, Manager - Engineering Res. & Dev., Dexter Axle Company, Inc., P. O. Box 250, 2030 South Main St., Elkhart, Indiana 46514; Mr. J. A. Brown Manager - Engineering Res. & Dev. Dexter Axle Company Inc. P. O. Box 250 2030 South Main St. Elkhart Indiana 46514; Dear Mr. Brown: This responds to your August 19, 1974, request to be advised of th steps necessary to acquire a manufacturer code number as required by Standards No. 119, *New pneumatic tires for vehicles other than passenger cars*, and No. 120, *Tire selection ad rims for motor vehicles other than passenger cars*.; Standard No. 119 applies to tires only and its is the responsibility o the tire manufacturer to obtain a code number and label it on his products. As a user of tires, you do not have obligations under this standard.; Standard No. 120 is a proposal which applies to rim construction an the selection of the correct rim for the vehicle it equips. As a manufacturer of rims you would have a responsibility to label your products if this proposal becomes an effective regulation. However, we noted in the preamble to that proposal (copy enclosed) that we will not require manufacturer codes until a separate manufacturer code system has been established.; I am also enclosing a copy of the most recent proposal on manufacture codes.; Yours truly, Richard B. Dyson, Acting Chief Counsel |
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ID: aiam1596OpenMr. J.A. Brown, Manager - Engineering Res. & Dev., Dexter Axle Company, Inc., P.O. Box 250, 2030 South Main St. Elkhart, Indiana 46514; Mr. J.A. Brown Manager - Engineering Res. & Dev. Dexter Axle Company Inc. P.O. Box 250 2030 South Main St. Elkhart Indiana 46514; Dear Mr. Brown: This responds to your August 19, 1974, request to be advised of th steps necessary to acquire a manufacturer code number as required by Standard No. 119, *New Pneumatic tires for vehicles other than passenger cars*, and No. 120, *Tire selection and rims for motor vehicles other than passenger cars.*; Standard No. 119 applies to tires-only and it is the responsibility o the tire manufacturer to obtain a code number and label it on his products. As a user of tires, you do not have obligations under this standard.; Standard No. 120 is a proposal which applies to rim constructions an the selection of the correct rim for the vehicle it equips. As a manufacturer of rims you would have a responsibility to label your products if this proposal becomes an effective regulation. However, we noted in the preamble to that proposal (copy enclosed) that we will not require manufacturer codes until a separate manufacturer code system has been established.; I am also enclosing a copy of the most recent proposal on manufacture codes.; Your truly, Richard B. Dyson, 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.