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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



Displaying 15711 - 15720 of 16490
Interpretations Date

ID: nht89-3.13

Open

TYPE: INTERPRETATION-NHTSA

DATE: 10/12/89

FROM: GEORGE MILLER -- MEMBER OF CONGRESS

TO: NANCY BRUCE -- DIRECTOR OFFICE OF CONGRESSIONAL AFFAIRS DEPARTMENT OF TRANSPORTATION

TITLE: NONE

ATTACHMT: ATTACHED TO LETTER DATED 12/1/89 FROM STEPHEN P. WOOD -- NHTSA TO U.S. CONGRESSMAN GEORGE MILLER; REDBOOK A34; STANDARD 125; LETTER DATED 10/17/89 FROM NANCY L. BRUCE -- D.O.T OFFICE OF CONGRESSIONAL AFFAIRS TO GEORGE MILLER, U.S. HOUSE OF REPR ESENTATIVES; LETTER DATED 10/4/89 FROM DELL RANDLE TO CONGRESSMAN GEORGE MILLER; LETTER DATED 9/8/89 FROM ELIZABETH M LUCAS -- NATIONAL SAFETY COUNCIL, PRODUCT DEVELOPMENT TO DELL RANDLE OF SHIKARI CONSULTANT FIRM LTD.

TEXT: Dear Ms. Bruce:

The enclosed correspondence from my constituent, Mr. Dell Randle, concerning the safety approval of his device, the Shi-Lite Holder, is being forwarded for your consideration.

I would appreciate any assistance you may be able to provide in addressing the concerns presented in Mr. Randle's letter. Please direct your response to Jennifer Steneberg of my Richmond office at 3220 Blume Drive, Suite 281, Richmond, CA 94806, (415 ) 222-4212.

Sincerely,

ID: nht70-2.42

Open

DATE: 12/17/70

FROM: AUTHOR UNAVAILABLE; Francis Armstrong; NHTSA

TO: The Goodyear Tire and Rubber Company

TITLE: FMVSR INTERPRETATION

TEXT: In your letter of November 18 you have requested an extension beyond one year of the time permissible for two DAF55 vehicles to remain in the United States for test purposes.

These vehicles were imported pursuant to 19 C.F.R. @ 12.80(b)(2)(vii) which permits importation of vehicles which do not conform to all applicable Federal motor vehicle safety standards:

. . .for the purposes of . . . test, experiment . . [if] such vehicle will not be sold or licensed for use on the public roads: Provided, That vehicles imported solely for purposes of test or experiment may be licensed for use on the public reads for a period not to exceed one year . . . ."

The Bureau cannot grant your request for an extension of the one year period, however, the regulation does not prohibit the continue use of these vehicles on private property after the one year licensed period has expired.

ID: aiam0820

Open
Mr. Albert Hammerstein, Robert Bosch GmbH, Department K/BEW3, 7 Stuttgart 30, Postfach 400, Germany; Mr. Albert Hammerstein
Robert Bosch GmbH
Department K/BEW3
7 Stuttgart 30
Postfach 400
Germany;

Dear Mr. Hammerstein: Your Broadview, Illinois, Subsidiary recently forwarded to us a copy o your December 17, 1971, letter concerning aiming adjustment tests as specified in SAE Standard J580a. A search of our files does not reveal that your letter was previously received by this Office.; Specifically, your concern is the interpretation of a requirement whic is specified in SAE J580a as follows:; >>>'2. The mechanism, including the aiming adjustment, must be s designed as to prevent the unit from receding into the lamp body or housing when an inward pressure of 50 lb(sic) is exerted on the outer surface of the lens.'<<<; Our interpretation of the above requirement is that no visible recedin of the sealed beam unit is permitted when the inward pressure is applied on the outer lens surface. Testing for compliance to the requirements of FMVSS No. 108, which references SAE J580a, is conducted on the basis of this interpretation.; In the upcoming Notice of Proposed Rule Making (NPRM) on FMVSS No. 10 (Docket 69-19), we are considering the feasibility of specifying more objective type requirements on this aspect of aiming adjustment tests for headlamps. You will no doubt be interested in commenting on the proposed requirements after issuance of the NPRM.; Sincerely, E. T. Driver, Director, Office of Operating Systems, Moto Vehicle Programs;

ID: nht94-5.44

Open

DATE: May 9, 1994

FROM: Womack, John -- Acting Chief Counsel, NHTSA

TO: Bloomfield, John -- Manager, Engine Management, Legislation and Certification, Lotus Cars, Ltd. (ENGLAND)

TITLE: NONE

ATTACHMT: Attached To a Letter Dated 10/28/93 From Rachel Jelly To John Womack

TEXT: This responds to the letter from Ms. Rachel Jelly, formerly of your company, concerning low volume CAFE exemptions. I apologize for the delay in our response. Ms. Jelly asked whether Bugatti Automobili S.p.A. (Bugatti) and Lotus Cars, Ltd. (Lotus), both of which are controlled by the same holding company, may submit separate low volume CAFE exemption petitions requesting two alternative standards. The answer to this question is no. Since any alternative CAFE standard would apply to Bugatti and Lotus together, a single combined petition must be submitted for a single alternative standard.

The reasons for the above response are discussed in the attached letter from NHTSA to Mr. Lance Tunick, of Bugatti. Mr. Tunick's letter to NHTSA raised issues that are of concern to both Bugatti and Lotus. Thus, NHTSA's response to Mr. Tunick should address Lotus' concerns about filing for alternative CAFE standards.

I hope this information is helpful. If there are any questions, please contact Dorothy Nakama of my staff at this address or at (202) 366-2992.

ID: 9325

Open

Mr. John Bloomfield
Manager, Engine Management
Legislation and Certification
Lotus Cars, Ltd.
Hethel, Norwich, Norfolk NR14 8EZ
England

Dear Mr. Bloomfield:

This responds to the letter from Ms. Rachel Jelly, formerly of your company, concerning low volume CAFE exemptions. I apologize for the delay in our response. Ms. Jelly asked whether Bugatti Automobili S.p.A. (Bugatti) and Lotus Cars, Ltd. (Lotus), both of which are controlled by the same holding company, may submit separate low volume CAFE exemption petitions requesting two alternative standards. The answer to this question is no. Since any alternative CAFE standard would apply to Bugatti and Lotus together, a single combined petition must be submitted for a single alternative standard.

The reasons for the above response are discussed in the attached letter from NHTSA to Mr. Lance Tunick, of Bugatti. Mr. Tunick's letter to NHTSA raised issues that are of concern to both Bugatti and Lotus. Thus, NHTSA's response to Mr. Tunick should address Lotus' concerns about filing for alternative CAFE standards.

I hope this information is helpful. If there are any questions, please contact Dorothy Nakama of my staff at this address or at (202) 366-2992.

Sincerely,

John Womack Acting Chief Counsel

ref:525 d:5/9/94

1994

ID: aiam4467

Open
Mr. Dana Strahan City of Orange Water Department P. O. Box 449 Orange, CA 92666-1591; Mr. Dana Strahan City of Orange Water Department P. O. Box 449 Orange
CA 92666-1591;

"Dear Mr. Strahan: This is in response to your inquiry earlier thi year to Mr. Ralph Hitchcock of our Rulemaking Division, in which you asked for information about Federal regulations that apply to the labeling of a vehicle that has been modified to increase its gross vehicle weight rating (GVWR) above that on the original label. I am pleased to have this opportunity to explain our certification regulations to you. Some background information on Federal motor vehicle safety laws and regulations may be helpful. As you are aware, our agency is authorized, under the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1381 et seq., Safety Act), to issue safety standards applicable to new motor vehicles and certain items of motor vehicle equipment. NHTSA, however does not approve motor vehicles or motor vehicle equipment, nor do we endorse any commercial products. Instead, the Safety Act establishes a 'self-certification' process under which each manufacturer is responsible for certifying that its products meet all applicable safety standards. For the purposes of this response, I have assumed that you were concerned about modifying vehicles that are already owned by the City of Orange Water Department. If this is incorrect, and you plan to modify new vehicles before their first sale or your department is in the business of modifying other persons' vehicles, please let me know because different requirements would apply. Neither the Safety Act nor any of our standards and regulations apply to modifications individual vehicle owners make to their own vehicles. Therefore, as a local government agency, the city of Orange, using in-house resources, can perform whatever modifications it desires to its own vehicles. Similarly, our certification regulation does not require modifiers of used vehicles to provide a separate certification label for the modified vehicle. As a word of caution, however, we suggest that any modification made to a vehicle that changes the GVWR assigned by the vehicle's original manufacturer should only be done after the modifier has made a thorough engineering analysis of the entire vehicle. We would suggest that you contact the original vehicle manufacturer for help in making such an analysis. You also indicated that you were concerned about potential liability that could arise if no additional label were affixed to show the modified vehicle's new GVWR. As explained above, a person modifying his or her own vehicle after its first purchase would not be subject to any potential liability under Federal law. If you are asking for information about potential liability under the laws of the State of California, this agency does not comment on such potential liability. I suggest that you contact the Attorney General for the State of California or a local attorney for an opinion about potential liability under California law. I hope this information proves helpful. Please contact this agency again if we can be of further assistance. Sincerely, Erika Z. Jones Chief Counsel";

ID: aiam2490

Open
Mr. Heinz W. Gerth, Vice President, Engineering and Service, Mercedes-Benz of North America, Inc., P.O. Box 350, Montvale, NY 07645; Mr. Heinz W. Gerth
Vice President
Engineering and Service
Mercedes-Benz of North America
Inc.
P.O. Box 350
Montvale
NY 07645;

Dear Mr. Gerth: This is in reply to your letter of December 21, 1976, asking whethe Federal Motor Vehicle Safety Standard No. 108 *Lamps, Reflective Devices, and Associated Equipment* applies to fog lamps installed on the rear of passenger cars.; No requirements of Standard No. 108 apply to fog lamps and they ar subject to regulation by the individual states. Pursuant to S4.1.3, however, they may be prohibited if they impair the effectiveness of lighting equipment required by Standard No. 108.; You also asked that, absent inclusion of these lamps in Standard No 108, your letter be treated as a petition 'for rulemaking to amend Standard No. 108 to include such lighting requirements . . . for optional use on passenger cars.' Your submission does not meet the requirements of our procedural regulations, a copy of which I enclose. Specifically, pursuant to 49 CFR 552.4(c) you should 'set forth facts which it is claimed establish that an order is necessary.' Among these facts should be reasons why you are petitioning for 'optional' rather than mandatory use on passenger cars, and why other vehicles are not included in your petition (if, in fact true).; Sincerely,Frank A. Berndt, Acting Chief Counsel

ID: aiam0755

Open
Mr. Herbert O. Staiger, Jr., Secretary-Treasurer, Airport Truck Center, Inc., 50 Murphy Road, Hartford, CT 06114; Mr. Herbert O. Staiger
Jr.
Secretary-Treasurer
Airport Truck Center
Inc.
50 Murphy Road
Hartford
CT 06114;

Dear Mr. Staiger: This is in response to your letter of May 23 to Mr. Schneider regardin incomplete vehicle certification and your responsibility as a truck dealership.; The regulation to which you refer is 49 CFR Part 568, *Vehicle Manufactured in Two or More Stages*. It applies to incomplete vehicle manufacturers, intermediate manufacturers, and final-stage manufacturers of vehicles manufactured in two or more stages. Truck dealers who perform these manufacturing functions are required to meet these requirements, a copy of which is enclosed for your information. The regulations do not apply to a truck dealer who does not modify completed vehicles received from a manufacturer or distributor.; Other Federal motor vehicle safety regulations and standards ar codified in Chapter V of Title 49, Code of Federal Regulations.; Yours truly, Richard B. Dyson, Assistant Chief Counsel

ID: aiam1535

Open
Mr. M.A. Chermak,Imperial-Eastman Corporation,1440 North 24th Street,Manitowoc, Wisconsin 54220; Mr. M.A. Chermak
Imperial-Eastman Corporation
1440 North 24th Street
Manitowoc
Wisconsin 54220;

Dear Mr. Chermak:#This responds to your May 21, 1974, question whethe 'I' or 'II' should appear as a part of the label information on renewable 3/8-inch and 1/2-inch SP fittings. #It is not permissible to include type 'I' or 'II' in the labeling required in renewable fittings. S7.2 calls for the end fitting identification which appears in your letter, but S7.2 reserves the use of 'I' and 'II' for use in reusable assemblies, that is, assemblies which include reusable end fittings. The standard classifies renewable end fittings as a type of permanently-attached end fitting.#Yours truly,Richard B. Dyson,Assistant Chief Counsel;

ID: aiam0750

Open
Mr. Keitaro Nakajima, Director/General Manager, Factory Representative Office, Toyota Motor Sales, U.S.A., Inc., 1099 Wall Street West, Lyndhurst, NJ 07071; Mr. Keitaro Nakajima
Director/General Manager
Factory Representative Office
Toyota Motor Sales
U.S.A.
Inc.
1099 Wall Street West
Lyndhurst
NJ 07071;

Dear Mr. Nakajima:#In your letter of June 19 you ask whether a propose headlamp symbol would meet the requirements of Standard No. 101.#The NHTSA answered this question in a notice published in the *Federal Register* on May 4, 1971 (36 F.R. 8296). In responding to a question by General Motors whether the published headlamp identification symbol was only representative of the required symbol, or definitive in the sense that it must be copied exactly, the NHTSA stated that it intended the symbol to be representative only.#I enclose a copy of the notice for your information.#Yours truly, Richard B. Dyson, Assistant 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.

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