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: 10925Open Mr. Lance Tunick Dear Mr. Tunick: This responds to your request for the agency to clarify the requirements of 49 CFR 575.101, which until recently required manufacturers to disclose information about the stopping performance of passenger cars and motorcycles. In particular, you asked how the requirement would apply to vehicles certified to comply with Federal Motor Vehicle Safety Standard No. 135, Passenger Car Brake Systems. I am enclosing a copy of a June 26, 1995, final rule in which the National Highway Traffic Safety Administration (NHTSA) rescinded section 575.101 (60 FR 32918). As a result of this decision, a vehicle manufacturer is no longer required to furnish information about the stopping performance of passenger cars and motorcycles. I hope this information is helpful to you. Should you have any questions or need additional information, please feel free to contact Marvin Shaw of my staff at this address or at (202) 366-2992. Sincerely,
John Womack Acting Chief Counsel Enclosure ref:575#105#135 d:7/26/95
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1995 |
ID: nht75-5.41OpenDATE: 12/02/75 FROM: AUTHOR UNAVAILABLE; Frank A. Berndt; NHTSA TO: Ralph Blake TITLE: FMVSR INTERPRETATION TEXT: As you requested in your December 1, 1975, telephone conversation with Karen Kreshover of this office, I am answering by letter your question as to whether motor vehicle dealers must retain copies of Federal odometer disclosure statements which they either receive or execute. Section 408 (a) of the Motor Vehicle Information and Cost Savings Act (15 U.S.C. 1988 (a)) gives the Secretary of Transportation authority to promulgate rules relating to the execution of statements disclosing odometer mileage on vehicles at the time of their sale. Such rules may, according to the Act, contain requirements prescribing the manner in which the necessary information is disclosed or retained. Pursuant to the mandate of section 408, the National Highway Traffic Safety Administration promulgated 49 CFR Part 580, Odometer Disclosure Requirements. This regulation does not, however, require individuals to retain either copies or originals of odometer disclosure statements that come into their possession. This means that a dealer need not retain statements that are provided to him when he purchases a vehicle; nor must he retain copies of statements executed by him to purchasers of vehicles he sells. SINCERELY, |
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ID: nht94-1.36OpenTYPE: Interpretation-NHTSA DATE: February 1, 1994 FROM: R. Mark Willingham -- Thornton, Summers, Biechlin, Dunham & Brown, L.C. TO: John Womack -- NHTSA TITLE: None ATTACHMT: Attached to letter dated 4/1/94 from John Womack to R. Mark Willingham (A42; Part 575) TEXT: This correspondence is in reference to 49 CFR 575.105 and the interpretations of same. After phone conversations with Ken Weinstein and Walter Meyers of NHTSA, I have been advised to make a formal request of specific questions and/or interpretations of 49 CFR 575.105, to your attention, for NHTSA's formal opinions. Please forward to my attention copies of any discussions, preambles, and/or supplements concerning the drafting and interpretations of 49 CFR 575.105. Additionally, please forward to my attention the following: 1) The definition and/or meaning of "permanent" as described in 49 CFR 575.105. 2) To whom is 49 CFR 575.105 directed (ie. Manufacturer, Distributor, Dealership), and whether it is extended to a seller of a used vehicle. I appreciate your cooperation and attention to this query. If any additional information is needed on my part, please do not hesitate to contact me at the above listed telephone number or 1-800-374-8574. |
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ID: nht72-4.50OpenDATE: 10/01/72 EST FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Pioneer Machinery Inc. TITLE: FMVSR INTERPRETATION TEXT: In your letter of September 15, 1972, you ask for clarification of the records that Pioneer Machinery, Inc., as a manufacturer and installer of truck hoists and racks, is required to keep. There are several regulations issued by the National Highway Traffic Safety Administration that could apply to Pioneer. The first of these is 49 CFR Part 566, Manufacturer Identification. Under this regulation manufacturers of vehicles and equipment to which a Federal motor vehicle safety standard applies must file certain information with the NHTSA. Although Pioneer may not manufacturer equipment subject to a standard, it could be a final-stage manufacturer, as defined by 49 CFR Part 568, Vehicles Manufactured in Two or More Stages, and subject to both these regulations. I enclose a copy of each. If Pioneer determines it is a "final-stage manufacturer" then it would also be subject to the obligations of Part 568 (@ 568.6) and the requirements of Part 567 (@ 567.5) Certification, copy enclosed. If Pioneer is a "final-stage manufacturer," it must file quarterly reports of production figures pursuant to 49 CFR Part 573, (@ 573.5 (b)) Defect Reports. I have also enclosed a copy of this regulation for your review. |
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ID: nht90-1.18OpenTYPE: Interpretation-NHTSA DATE: January 18, 1990 FROM: Robert E. Meadows -- Engineering Manager, Wayne Corporation TITLE: None ATTACHMT: Attached to letter dated 1-8-90 from R. Marion to C. Karl; Also attached to memo dated 11-28-8? from C. Karl to All School Bus LCR II's; Also attached to letter dated 11-27-90 from P.J. Rice to C. Karl (A36; Std. 217); Also attached to letter d ated 12-7-82 from F. Berndt to M.B. Mathieson; Also attached to letter dated 1-29-90 from C. Karl to M. Shaw (OCC 4403) TEXT: This certifies that Accessories KE06-08 and ME06-01, Vandal Locks, meet all requirements of Federal Motor Vehicle Safety Standard No. 217, and Minnesota and Iowa standards. The above options are comprised of: 1. A key lock for the front door 2. A rear slide bolt on the rear door (no rear key is required), hooked into starter interlock system so that the engine cannot be started 3. A buzzer in the driver's area tied in with the interlock that would warn the driver if anyone was trying to lock the door after the engine was started The above systems have been used by Wayne Corporation since 1977. |
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ID: nht94-8.35OpenDATE: February 1, 1994 FROM: R. Mark Willingham -- Thornton, Summers, Biechlin, Dunham & Brown, L.C. TO: John Womack -- NHTSA TITLE: None ATTACHMT: Attached to letter dated 4/1/94 from John Womack to R. Mark Willingham (A42; Part 575) TEXT: This correspondence is in reference to 49 CFR 575.105 and the interpretations of same. After phone conversations with Ken Weinstein and Walter Meyers of NHTSA, I have been advised to make a formal request of specific questions and/or interpretations of 49 CFR 575.105, to your attention, for NHTSA's formal opinions. Please forward to my attention copies of any discussions, preambles, and/or supplements concerning the drafting and interpretations of 49 CFR 575.105. Additionally, please forward to my attention the following: 1) The definition and/or meaning of "permanent" as described in 49 CFR 575.105. 2) To whom is 49 CFR 575.105 directed (ie. Manufacturer, Distributor, Dealership), and whether it is extended to a seller of a used vehicle. I appreciate your cooperation and attention to this query. If any additional information is needed on my part, please do not hesitate to contact me at the above listed telephone number or 1-800-374-8574. |
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ID: nht93-5.24OpenTYPE: Interpretation-NHTSA DATE: July 14, 1993 FROM: Zaher A. Obeid -- President & CEO, Petrobeid of Syria TO: NHTSA TITLE: Re: Zatalite device for preventing tragical motor vehicle accidents especially on highways ATTACHMT: Attached to letter dated 7/29/93 (est) from John Womack to Zaher A. Obeid (A41; Std. 108; VSA 108); Also attached to letter dated 8/17/89 from Stephen P. Wood to Alan S. Eldahr (Std. 108) TEXT: "Please allow me to submit to you some chosen documents and details of my patented leading invention above, which is intended to be manufactured and distributed in the U.S.A. in the near future. Prior to such a final step, and as I am quite concerned to make this device as safe and useful as possible, I shall absolutely and always need any serious remark and/or comment, especially from highly experienced adminstrations like yours. Therefore, please kindly read the attached details carefully, and let me have your esteemed opinion, along with any suggestion that you may find useful. Your cooperation will be very valuable to me, and shall very much appreciate to hear from you at an early convenience.
Attachment Zatalite brochure (text and photos omitted). |
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ID: nht73-2.16OpenDATE: 11/09/73 FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA TO: Lane County District Attorney TITLE: FMVSR INTERPRETATION TEXT: You have asked what information an automobile dealer must provide in a Federal odometer statement concerning prior vehicle ownership and mileage over 100,000 miles The Federal regulation only requires information which the transferor knows or has good reason to know about the vehicle's mileage. It does not require that he disclose the name of the former owner. It does not require that he state the recorded mileage, and if he knows or has good reason to know that the recorded mileage is not correct he must make a further statement that the actual mileage is unknown. In your example, therefore, he would only state the five-digit figure appearing on the odometer, and make the further statement if he knew or had been told that the vehicle had traveled more than 100,000 miles. He is not required to check with former owners as to vehicle history, but he would be accountable under local consumer protection laws for any misleading statements he made about the vehicle's history. Please contact me if I can be of further assistance. Sincerely, Enclosure |
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ID: nht72-6.50OpenDATE: 02/09/72 FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA TO: George Diederich TITLE: FMVSR INTERPRETATION TEXT: This is in reply to your letter to Secretary Volpe concerning the Tire Identification and Record Keeping regulation (49 CFR 574). It is unfortunate that you feel the way you do concerning the regulation. However, it does not appear to be an unreasonable burden on the seller of the mobile home to record the name of the purchaser of the mobile home and forward it to the manufacturer. With regard to the need for the regulation the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1381 et seg.) was amended by adding section 113(f) (15 U.S.C. 1402) which requires manufacturers of tires to maintain the names of first purchasers. The amendment also provides that the Secretary may establish procedures for the maintainance of these records. The legislative history of section 113(f) clearly indicates that the Congress recognized that in spite of defective tires reaching the marketplace, tire manufacturers had no way of notifying the purchaser of the defective tire and that he could be jeopardising his life and property, as well as the life and property of the general public, by continuing to use the defective tire. |
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ID: nht94-1.49OpenTYPE: INTERPRETATION-NHTSA DATE: February 9, 1994 FROM: James H. Shuff -- President, Freedom Trailers TO: Chief Counsel, NHTSA TITLE: NONE ATTACHMT: Attached to letter dated 7/14/94 from John Womack to James H. Shuff (A42; STD 120; VSA 102(3)) TEXT: I was advised by Mr. George Shifflet of the D.O.T. to contact you and request a ruling on the Park Model Travel Trailers that I am building. I am custom building park model travel trailers. These units, by ANSI code 119.5, are limited to a maximum of 400 sq, ft. There are park models that are recognized by H.U.D. but they are 500sq. ft. They are intended for recreational use only and no t for year round living. These units can be used in the same manner as conventional travel trailers for winter camping in the year round parks. These units can be as wide as 12'. The units that I am building are to order only. Once they are constructed they will be towed to their campsite and set up. The tires and the rims will be retained by me and used over again. Mr. Shifflet did not seem to think that there would be a p roblem with this, but suggested that I contact you for an opinion. |
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.