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: 24739.drnOpenMs. Rhonda Lordet Dear Ms. Lordet: This responds to your letter seeking confirmation that "there are no standards or regulations concerning hubcaps or wheel covers." You are correct in your understanding that there is no longer a Federal Motor Vehicle Safety Standard (FMVSS) regulating hubcaps or wheel covers. In the past, FMVSS No. 211 (Standard No. 211), Wheel nuts, wheel discs, and hub caps, (49 CFR Section 571.211) precluded certain wheel nuts, wheel discs, and hub caps from having "winged projections." We were concerned that the winged projections could catch on clothing or strike legs or other body parts, posing a hazard to pedestrians and cyclists. Standard No. 211 was rescinded in a final rule published in the Federal Register on May 6, 1996, (61 FR 20172).The final rule took effect on June 5, 1996. However, a hubcap or wheel cover designed to be used on motor vehicles is an item of "motor vehicle equipment," and is subject the recall and remedy provisions of the Vehicle Safety Act.If a manufacturer or NHTSA determines that the product contains a safety-related defect, the manufacturer is responsible for notifying purchasers of the defective vehicle or item of motor vehicle equipment and remedying the problem free of charge.(This responsibility is borne by the vehicle manufacturer in cases in which a device is installed on or in a new vehicle by or with the express authorization of that vehicle manufacturer.)I have enclosed an information sheet that describes these and other responsibilities. I hope this information is helpful.If you need any further information, please contact Dorothy Nakama of my staff at this address or at (202) 366-2992. Sincerely, Jacqueline Glassman Enclosure |
2002 |
ID: 2789oOpen Mr. J. Mike Callahan Dear Mr. Callahan: This is in reply to your letter of April l4, 1987, to Mr. Vinson of this office with respect to your representation of a company "that will be selling plastic name plates which would be installed behind the red lens of the third brake light." You stated that "these are to be sold to new car dealerships. When the driver of the car steps on the brake the dealer's name lights up." You ask for letters regarding the legality of the name plates for 24 States. We regret the delay in responding to your request. When Mr. Vinson tried to reach you by phone this week he was told that you had already received a letter, and that the answer was negative. Perhaps that letter came from one of the 24 States listed in your letter. We are unable to advise you of the legality under State laws, but I have enclosed representative interpretation letters of this agency on the legality of similar devices under Federal law. Sincerely,
Erika Z. Jones Chief Counsel / ref:l08 d:8/ll/88 |
1970 |
ID: 21111.ztvOpenMr. Tadzio Suzuki Re: Motorcycle turn signal lamps Dear Mr. Suzuki: This is in reply to your letter of December 17, 1999, asking whether a turn signal lamp design is in accordance with Federal Motor Vehicle Safety Standard No. 108. The turn signal lamp system consists of two lamps and is intended for use on motorcycles. In Stanley's design, the turn signal lamp contains two filaments, one performing the turn function and the other functioning as a "parking lamp." The parking lamp meets the requirements of Standard No. 108. You later describe the parking lamp as "operating continuously." When the turn signal is activated, the parking lamp function is turned off in the turn signal lamp, while it continues to function in the other turn signal lamp. In your opinion,
We regard the Stanley turn signal lamp design as incorporating an auxiliary function not required by Standard No. 108 for motorcycles. Under S5.1.3, this is acceptable if it does not impair the effectiveness of the required lighting equipment. We do not believe that the "parking" system you describe would have an impairing effect, and conclude that it is permissible under Standard No. 108. Sincerely, |
2000 |
ID: nht73-3.40OpenDATE: 03/08/73 FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA TO: Dow Corning Corporation TITLE: FMVSS INTERPRETATION TEXT: This is in response to your letter of February 26, 1973, in which you inquired whether our brake fluid standard, No. 116, has preempted State regulation with respect to silicone-based brake fluids. As you know, Standard No. 116 does not presently contain any performance requirements for silicone-based brake fluids. The recent amendment of January 31, 1973 (38 FR 2981) only establishes labeling requirements for these fluids. Section 103(d) of the National Traffic and Motor Vehicle Safety Act, 15 U.S.C. 1392(d), states that no State shall have a safety standard "applicable to the same aspect of performance" as a Federal standard that is not identical to the Federal standard. In this case, no "aspects of performance" at all, other than labeling, are covered by the Federal standard, so the State performance standards other than labeling cannot be said to cover the same aspects of performance. For these reasons the State performance requirements are not preempted by Standard No. 116. To hold otherwise would have the effect of voiding all State regulation of this product, leaving nothing in its place, until a Federal standard came into effect. No such results were intended by the issuance of the labeling amendment. Work is in process to propose performance standards for silicone-based brake fluids and we plan to have requirements in effect before very much more time passes. At that time, of course, all State regulations will have to be identical to the Federal standard. |
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ID: nht91-3.24OpenDATE: April 16, 1991 FROM: Paul R. Kirchgraber -- Souvenirs of the Future TO: Paul Jackson Rice -- Chief Consul, NHTSA TITLE: Re Request For Interpretation of Federal Standards Compliance ATTACHMT: Attached to letter dated 5-6-91 from Paul Jackson Rice to Paul R. Kirchgraber (A37; Std. 108) TEXT: I am writing to request a legal interpretation from your office on exactly which standards, if any, my firm needs to comply with in order to sell an exterior tire/wheel cover for on-road vehicular use. This tire cover is to be made from a new fabric that our company has developed which is both solar heat reflective and highly reflective of light (see enclosed). We believe that when this cover is placed on the exterior mounted tire of a motor home, trailer, passenger van or four wheel drive, it will provide a significant safety enhancement by making the vehicle more visible to the surrounding traffic. The THERMAL reflective characteristic of this tire cover currently has important use in the off-road motor car racing industry in that it helps keep the temperature of high performance racing tires at a constant level prior to race time. Because of the LIGHT reflective characteristics, we are also interested in adapting this product for on-road use as an external tire cover. In order to offer this product for commercial sale, we want to be certain that the reflective nature of the fabric used in this cover does not present a safety hazard. I would be grateful if you would please cite any appropriate federal test standards from the code of federal regulations for similar automotive accessories. |
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ID: nht70-2.34OpenDATE: 11/03/70 FROM: R. A. DIAZ -- NHTSA; SIGNATURE BY GEORGE C. NIELD TO: B. Borisoff TITLE: FMVSR INTERPRETATION TEXT: Reference is made to your letter of October 14, 1970 to Secretary Volpe regarding our Consumer Information publication. Concerning your comments on stopping distance, the wording used on page 4 is the exact wording of this regulation. The category "Stopping distance in feet with emergency brakes (partial service brake system)" is a generalization of the regulatory wording meant to convey the sense of this requirement to a consumer who may have no engineering background. The paragraph on page 193 paraphrases the regulatory wording. The title "Partial Failure on One System" is, again, meant to convey the meaning to an otherwise uninformed consumer. I trust this clarifies the situation for you. The reason many motorcycles are not listed is the fact that the data was not received in time to be included in the book. I am enclosing copies of the data available for U.S. made motorcycles as you requested. Volume 2, covering the 1971 makes and models will be available approximately November 15, 1970 and can be obtained from the Government Printing Office at a cost of $ 2.00. In addition two (2) new Consumer Aid publications entitled "BRAKES - A Comparison of Braking Performance for 1971 Passenger Cars" and "TIRES - A Comparison of Tire Reserve Load for 1971 Passenger Cars" will also be available at a cost of $ .40 each. Many thanks for your kind words and your interest in our motor vehicle safety program. |
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ID: nht90-2.23OpenTYPE: INTERPRETATION-NHTSA DATE: APRIL 25, 1990 FROM: STEPHEN P. WOOD -- ACTING CHIEF COUNSEL, NHTSA TO: CHARLES M.A. SAEDT TITLE: NONE ATTACHMT: LETTER DATED 4-8-90 FROM CHARLES M.A. SAEDT ATTACHED; (OCC-4641) TEXT: This is in reply to your letter of April 8, 1990, with respect to your intended exportation of a Volkswagen manufactured to conform to European specifications. You are a member of the Dutch armed forces, and you will be in the United States until June 1 991. You understand that you will need to get an exemption when you import the car into the United States. As Taylor Vinson of this OffiCe explained to you on April 10, at the port of entry you will be required to execute a Form HS-7, a declaration form covering the importation of your car into the United States. It appears that you are eligible to mark Box 12, and to import the vehicle under the declaration that you are a member of the armed forces of a foreign country on assignment in the United States. You must attach a copy of your official orders to this form. When this is done, there should be no pr oblem in importing your car. You also represent by marking Box 12 that you are importing the vehicle for your own personal use and on a temporary basis, that you will not sell the vehicle to any person in the United States, and that you will export the vehicle upon departing the Uni ted States at the conclusion of your tour of duty.
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ID: 2411yOpen Mr. Charles M.A. Saedt Dear Mr. Saedt: This is in reply to your letter of April 8, l990, with respect to your intended exportation of a Volkswagen manufactured to conform to European specifications. You are a member of the Dutch armed forces, and you will be in the United States until June 1991. You understand that you will need to get an exemption when you import the car into the United States. As Taylor Vinson of this Office explained to you on April 10, at the port of entry you will be required to execute a Form HS-7, a declaration form covering the importation of your car into the United States. It appears that you are eligible to mark Box 12, and to import the vehicle under the declaration that you are a member of the armed forces of a foreign country on assignment in the United States. You must attach a copy of your official orders to this form. When this is done, there should be no problem in importing your car. You also represent by marking Box 12 that you are importing the vehicle for your own personal use and on a temporary basis, that you will not sell the vehicle to any person in the United States, and that you will export the vehicle upon departing the United States at the conclusion of your tour of duty. Sincerely, Stephen P. Wood Acting Chief Counsel ref:59l d:4/25/90 |
1990 |
ID: 2412yOpen Mr. Charles M.A. Saedt Dear Mr. Saedt: This is in reply to your letter of April 8, l990, with respect to your intended exportation of a Volkswagen manufactured to conform to European specifications. You are a member of the Dutch armed forces, and you will be in the United States until June 1991. You understand that you will need to get an exemption when you import the car into the United States. As Taylor Vinson of this Office explained to you on April 10, at the port of entry you will be required to execute a Form HS-7, a declaration form covering the importation of your car into the United States. It appears that you are eligible to mark Box 12, and to import the vehicle under the declaration that you are a member of the armed forces of a foreign country on assignment in the United States. You must attach a copy of your official orders to this form. When this is done, there should be no problem in importing your car. You also represent by marking Box 12 that you are importing the vehicle for your own personal use and on a temporary basis, that you will not sell the vehicle to any person in the United States, and that you will export the vehicle upon departing the United States at the conclusion of your tour of duty. Sincerely, Stephen P. Wood Acting Chief Counsel ref:59l d:4/25/90 |
1990 |
ID: nht71-5.20OpenDATE: 12/12/71 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: The General Tire & Rubber Company TITLE: FMVSS INTERPRETATION TEXT: In response to your letter of September 22, 1971, I have enclosed a copy of our letter of May 21, 1971, to Mr. George Jones of the Louisiana Tire Dealer and Retreader Association. Department of Transportation regulations require that we charge a duplicating fee of $ .50 per page for this service. Please, therefore, remit the sum of $ 1.50 to the undersigned, payable to the Treasurer of the United States. In your letter you also enclosed a copy of an article that appeared in the September 1971 edition of the Modern Tire Dealer Magazine concerning the letter to Mr. Jones, and ask whether the article's conclusion that wheel testing is not a must," is accurate. This conclusion is correct. Under the National Traffic and Motor Vehicle Safety Act (15 U.S.C. @ 1381 et seq.), manufacturers are not required to test the compliance of their products to applicable standards in any particular manner. The test procedures specified in any particular standard indicate only the manner by which the agency will test for compliance, and manufacturers are free to utilize any test procedure they wish as long as they can show that they exercised "due care to comply with the standard. The use of wheel tests, however, as our letter to Mr. Jones indicates, may have an effect on a manufacturer's ability to show he used "due care" should he be called on to make that showing. ENC. |
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.