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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 1191 - 1200 of 2914
Interpretations Date

ID: nht68-1.37

Open

DATE: 01/11/68

FROM: AUTHOR UNAVAILABLE; Robert M. O'Mahoney; NHTSA

TO: United States Auto Club

TITLE: FMVSR INTERPRETATION

TEXT: Secretary Boyd has asked that we reply to your letter of November 27, 1967. Your letter raises questions concerning joint regulations to be issued by the Department of the Treasury and the Department of Transportation governing the importation of motor vehicles and motor vehicle equipment subject to motor vehicle safety standards.

You are correct in your understanding that the Act was not intended to apply to vehicles prepared for auto racing or race tracks and not intended for use on the public streets or highways.

The question you raised concerning the use of the words "by bona fide auto vehicle manufacturers" has also been raised by others who have commented on the proposed regulations. Accordingly, you will note that the regulations, a copy of which is attached, have been changed so as to eliminate this phraseology and make it clearer that vehicles intended for "competition" and which "will not be sold or licensed for use on the public roads" may be admitted. This provision will not require an affidavit on the part of the importer but merely a declaration to this effect.

We believe that the regulations, as amended, will provide for the unhampered entry of foreign built race cars for the Indianapolis 500 race and other USAC sanctioned events.

ID: nht68-3.46

Open

DATE: 07/31/68

FROM: AUTHOR UNAVAILABLE; J. R. O'Gorman; NHTSA

TO: Associazione Nazionale Fra Industrie Automobilistiche

TITLE: FMVSS INTERPRETATION

TEXT: Thank you for your letter of June 3 to the National Highway Safety Bureau asking "whether the solution given in the enclosed drawing N. 591-1559 of Ferrari is in line with the requirements" of Federal motor vehicle safety standard No. 211.

This standard states that "wheel nuts, hub caps, and wheel discs for use on passenger cars . . . shall not incorporate winged projections". The Ferrari plan appears to incorporate such a projection, even though it is recessed. Accordingly the proposed solution by Ferrari does not meet the requirements of Federal standard No. 211.

ASSOCIAZIONE NAZIONALE FRA INDUSTRIE AUTOMOBILISTICHE

U.S. Department of Transportation Federal Highway Administration National Highway Safety Bureau

June 3 1968

Motor Vehicle Safety Standard n. 211

Reference is made to your letter of December 21st 1967 and we wish to thank you very much for the explanations about the standard N. 211.

Further we would appreciate it very much your letting us know whether the solution given in the enclosed drawing N. 591-1559 of Ferrari is in line with the requirements concerning "wheel nuts, hub caps and wheel discs".

Thanking you in advance, we remain

Faithfully Yours,

(Illegible Word) Direttore (Francesco Palazzi)

ID: nht71-1.35

Open

DATE: 12/02/71

FROM: RICHARD B. DYSON For Lawrence R. Schneider -- NHTSA

TO: G & D Communications Corporation

TITLE: FMVSR INTERPRETATION

TEXT: This is in reply to your letter of October 22, 1971, and your phone call to Michael Peskoe of November 15, 1971, requesting a copy of the Consumer Information regulations and asking what penalties may be imposed on manufacturers if their vehicles cannot perform as well as the figures they provide pursuant to the regulation. You stated in the above conversation that you have obtained the volume entitled "Performance Data for New 1971 Passenger Cars and Motorcycles" which contains a copy of the Consumer Information requirements. I have enclosed certain amendments to the Consumer Information regulations which will bring the regulations as they appear in this volume up to date.

With reference to your question regarding penalties for violations of the Consumer Information requirements, Section 108 and 109 of the National Traffic and Motor Vehicle Safety Act of 1966 (15 U.S.C.@@ 1397, 1398) authorize the imposition of civil penalties of up to $ 1,000 per violation, and up to $ 400,000 for any related series of violations, against manufacturers whose vehicles cannot perform at least as well as the data they supply indicates. In addition, injunctive proceedings may be utilized pursuant to section 110 of the Act (15 U.S.C.@ 1399).

I trust this answers your question. We regret that it was over-looked in our first response to your letter.

ID: nht71-4.13

Open

DATE: 09/18/71

FROM: AUTHOR UNAVAILABLE; L. R. Schneider; NHTSA

TO: Meiji Rubber & Chemical Company, Ltd.

TITLE: FMVSS INTERPRETATION

TEXT: RE: HYDRAULIC BRAKE HOSE ASSEMBLIES

This is in reply to your letter of September 3 asking questions about compliance of hydraulic brake hose assemblies with Federal Motor Vehicle Safety Standard No. 106.

With respect to your first two questions, the National Highway Traffic Safety Administration does not require that you demonstrate compliance with Standard No. 106 prior to supplying Japanese car manufacturers with brake hose assemblies to be installed on cars intended for export to the United States. If the Japanese vehicle manufacturers request proof of compliance from you (apparently in the form of a certification from the Commonwealth of Pennsylvania based upon test reports from only one of two test laboratories) such a request is solely a business matter between you and the vehicle manufacturer.

Your third question points out that proposed Standard No. 106 (Docket No. 1-5, Notice 7) would eliminate the specification of braid material for hydraulic brake hoses and asks whether you may implement this "revision" at the present time. Notice 7 is a proposal only, and the current requirements specifying braid material remain in effect until a formal amendment of Standard No. 106 occurs. The brake hose manufacturer's code number, the subject of your fourth question, is also a proposal which may or may not be adopted in the final rule.

ID: 17569.ztv

Open

Mr. Peter Borne
SuperHero Cars Ltd.
6336 Humboldt Ave. S.
Richfield, MN 55423

Dear Mr. Borne:

This will confirm that we regard as a 1971 motor vehicle the Bat-Mobile you described in your letter of March 12, 1998, as follows:

This is a custom built fiberglass molded body, which has been mounted to a 1971 Chrysler New Yorker Frame. All the running gear and mechanical elements are 1971. The engine . . . has been replaced by the same 1971 Vintage Chrysler 440. This car is registered in Vancouver B.C. as a 1971 New Yorker.

You may import this vehicle pursuant to the declaration that the vehicle is 25 or more years old, which means that it does not have to be brought into conformity with the Federal motor vehicle safety standards. However, this exemption does not apply to those items of equipment which are the subject of certain individual Federal motor vehicle safety standards. These items are brake hoses and brake fluid, lighting equipment, tires, glazing, and seat belt assemblies (if the Bat-Mobile is equipped with them). These items of equipment must conform in order to be imported. Generally, conformance with our requirements is indicated by the DOT symbol which the manufacturer has placed on the item to certify compliance.

We are unable to advise you on the requirements of the Environmental Protection Agency for exceptions to the emissions regulations.

If you have any further questions, you may call Taylor Vinson of this Office who spoke with you on April 16 (202-366-5263).

Sincerely,
John Womack
Acting Chief Counsel
ref:591
d.5/14/98

1998

ID: 8589r

Open

Dr. Thomas Lckemeyer
Dept VER/LB
SWF Auto-Electric GmbH

FAX 07142/73 28 95

Dear Dr. Lckemeyer:

As you have requested, we are responding by FAX to your FAX letter of June 25, 1993, to Taylor Vinson of this Office.

Our FAX letter to you of May 28, 1993, provided an interpretation of SAE J588 NOV84, incorporated by reference in Federal Motor Vehicle Safety Standard No. 108. You mention the l990 SAE Ground Vehicle Lighting Manual which refers to SAE J588 September l970, and ask which is the correct SAE reference.

Standard No. 108 was amended with an effective date of December 1, 1990, to substitute "SAE J588 NOV84" for "SAE J588 September 1970" as the U.S. Federal requirement for turn signal lamps used as original equipment on passenger cars and other motor vehicles with an overall width of less than 80 inches overall width. Turn signal lamps may still be manufactured to the requirements of "SAE J588 September 1970" if they are intended to replace original equipment turn signal lamps that were manufactured in accordance with "SAE J588 September 1970." We understand that your earlier letter asked for an interpretation of Standard No. 108 as it related to the design of lamps for future production, and trust that this answers your question.

As you have requested, we are also FAXing a copy of Table III. Sincerely,

John Womack Acting Chief Counsel ref:108 d:7/8/93

1993

ID: nht80-3.26

Open

DATE: 07/30/80

FROM: FRANK BERNDT -- CHIEF COUNSEL NHTSA

TO: DIETMAR M. HAENCHEN -- ADMINISTRATOR VEHICLE REGULATIONS VOLKSWAGEN OF AMERICA INC

TITLE: NONE

ATTACHMT: ATTACHED TO LETTER DATED 09/15/88 TO M. IWASE FROM ERIKA Z. JONES, REDBOOK A32 STANDARD 108; LETTER DATED 02/22/88 TO ERIKA Z. JONES' FROM M. IWASE RE INSTALLATION OF TAIL AND STOP LAMP ONTO MOVING VEHICLE PART

TEXT: Dear Mr. Haenchen:

This is in reply to your letter of April 2, 1980, asking for information of your interpretation of Section 4.2.1 of Motor Vehicle Safety Standard No. 108.

This section states that lamps "shall be securely mounted on a rigid part of the vehicle ... that is not designed to be removed except for repair." It is your belief that this section would allow a configuration in which back-up lamps and license plate lamps could be mounted on the deck lid.

We concur with this interpretation. The requirement for rigidity is meant to insure that lamps and reflectors do not sway in the wind on hinges or flexible mud flamps when the vehicle is in motion. The passenger cars you propose to manufacture will normally be operated with the deck lid closed and the lamps in full view on a rigid part of the vehicle as the standard requires. However, placement of a stop lamp and taillamp on a deck lid could be viewed as a defect in performance, and hence a safety related defect requiring notification and remedy.

Sincerely

ID: nht93-2.50

Open

DATE: April 13, 1993

FROM: Jim Keizer

TO: Office of the Chief Counsel -- NHTSA

TITLE: None

ATTACHMT: Attached to letter dated 5-6-93 from John Womack to Jim Keizer (A41, Std. 208); Also attached to letter dated 3-26-93 from John Womack to Jay Lee (Std. 208); Also attached to letter dated 3-26-93 from John Womack to Steven C. Friedman (Std. 208); Also attached to letter dated 6-11-91 from Paul Jackson Rice to Stephen Mamakas (Std. 208); Also attached to letter dated 5-13-91 from Paul Jackson Rice to Stephen Mamakas (Std. 208); Also attached to letter dated 1-19-90 from Stephen P. Wood to Linda L. Conrad (Std. 208)

TEXT: I'm an individual that has a dream of starting my own small business or repacking or replacing air bags in automobiles.

To begin with, I need to know what legal ramifications might be involved. What kind of liability is needed, etc. Next, I need to know the technical side of the business, such as, must I be certified by the national auto makers and if so how do I get this done?

I also would like to have yur input on whether you feel there is a market for this service, keeping in mind insurance companies savings by having an individual like myself doing this job. The amount of auto recyclers rebuilding cars to help our environment comes into play also.

Please advise me on anything that you might feel would be of assistance to me to start this business. I will appreciate any and all information you can provide.

ID: nht93-5.19

Open

TYPE: Interpretation-NHTSA

DATE: July 9, 1993

FROM: Margret Schmock von Ohr -- Robert Bosch GmbH

TO: Taylor Vinson -- Office of Chief Counsel, DOT

TITLE: Painted reflex reflectors for passenger cars

ATTACHMT: Attached to letter dated 10/13/93 from John Womack to Frau Margret Schmock von Ohr (A41; Std. 108)

TEXT:

This responds to my fax from May 3, 1993, Mr. Womack's reply from May 10, 1993 and our telephone call from today.

I had asked you whether it is permissible to paint reflex reflectors (exterior painting) for motor vehicles and under which conditions. Although you had already told me that it is permissible provided that all requirements of Standard 108 including the referenced SAE J594f are met I have to ask for further information.

1. Does the combination "Plastic + paint" have to meet SAE J576c? (Outdoor exposure test takes three!!!! years so that we cannot start our production now!)

2. Is it sufficient to have only the plastic material (without paint) tested according to SAE J576c?

3. If it is not sufficient how can we get an exception to the rule?

I want to highlight again that our production will be changed from painting to 2-color-molding in December 1993. Painting is only a transitional process!

Please protect this request as a confidential business information.

I would appreciate your response until next week.

Thank you very much in advance.

ID: nht68-1.41

Open

DATE: 06/10/68

FROM: WILLIAM HADDON -- FEDERAL HIGHWAY ADMINISTRATION

TO: HARRY F. BARR -- VICE PRESIDENT ENGINEERING STAFF GENERAL MOTORS TECHNICAL CENTER GENERAL MOTORS CORPORATION

TITLE: NONE

TEXT: Dear Mr. Barr:

The interpretations of Motor Vehicle Safety Standard No. 105 regarding cable type and bar type brake controls for driver training vehicles described in your letter of May 24 are quite correct. Motor Vehicle Safety Standard No. 105 does not apply to the installation of add-on driver training brake controls following retail sale of a new car. In the case of installation of add-on driver training brake controls in new cars prior to retail sale, the following apply:

a. Motor Vehicle Safety Standard No. 105 does not apply to the add-on brake control itself; however, the installation of such controls must not affect compliance of the regular hydraulic brake system to Motor Vehicle Safety Standard No. 105.

b. Following installation of a mechanical-type add-on brake control, the installing dealer is responsible for determining that compliance of the regular brake system is not impaired by verifying that the add-on control does not interfere with normal driver access to and application of the regular brake pedal.

Although endorsing your understanding of the requirement imposed by Motor Vehicle Safety Standard No. 105, I am not endorsing these brake devices or passing on their safety from a crash standpoint.

I appreciate your interest in driver education and training and your efforts to further traffic safety through this program.

Sincerely,

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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