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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 15681 - 15690 of 16490
Interpretations Date

ID: nht89-1.87

Open

TYPE: INTERPRETATION-NHTSA

DATE: 05/09/89

FROM: FRED GRANDY -- CONGRESS

TO: JERRY CURRY -- NHTSA

TITLE: NONE

ATTACHMT: ATTACHED TO LETTER DATED 07/05/89 FROM JEFFREY R. MILLER -- NHTSA TO FRED GRANDY, REDBOOK A33 (3); STANDARD 108; LETTER DATED 05/05/89 FROM DANIEL F. WIECHMANN TO ROBERT A. DETERMAN, RE THE STATE OF IOWA VS. BARRY LYNN SPEICH; LETTER DATED 09/2 3/88 FROM DANIEL F. WIECHMANN TO RUTH SKLUZACEEK, RE THE STATE OF IOWA VS. BARRY LYNN SPEICH, FRANKLIN COUNTY CRIMINAL NO. WD488435; NO 24.432.0788 [321.424] OF THE CODE OF IOWA; LETTER DATED 10/10/88 FROM JODY JOHNSON -- IOWA DOT TO DANIEL F. WIECHMANN , REF NO 911.2; LETTER DATED 10/14/88 FROM DANIEL F. WIECHMANN TO RALPH HITCHCOCK -- NHTSA, RE THE STATE OF IOWA VS. BARRY LYNN SPEICH FRANKLIN COUNTY CRIMINAL NO WD488435; NO 24.432.0788 [321.424] OF THE CODE OF IOWA

TEXT: Dear Jerry:

Recently I was contacted by Daniel Wiechmann, Jr. an attorney from Hampton, Iowa concerning an October 14, 1988 letter he sent to Mr. Ralph Hitchock at the National Highway Traffic Safety Administration Standards that has not been responded to as of this date. Enclosed find the correspondence I have received from Mr. Wiechmann.

I would be grateful if you would review this matter so a reply can be sent to Mr. Wiechmann as soon as possible. Mr. Wiechmann has indicated he has a case pending in the District Court of the State of Iowa waiting on this response. I would appreciate a copy of your response sent to my Mason City office.

Thank you for your attention in this matter.

Sincerely,

Enclosure

ID: nht93-1.10

Open

DATE: January 14, 1993

FROM: Bob Dittert -- Trooper, Texas Department of Public Safety, Safety Education Service

TO: Chief Counsel -- NHTSA

COPYEE: Janet Monteros -- Office of the Attorney General, General Litigation Section

TITLE: None

ATTACHMT: Attached to letter dated 5-5-93 from John Womack to Bob Dittert (A41; Std. 205; VSA 103(d))

TEXT: It would be appreciated if your agency would make clear the authority of the CFR's concerning automotive equipment standards for new vehicles and after- market equipment.

1. Are the CFR's law and enforceable only by federal agents?

2. Are the Federal Motor Vehicle Safety Standards law and only enforceable on new manufactured vehicles?

3. Are states allowed to enact legislation that allows less stringent standards than the CFR's?

4. Concerning the installation of non-complying automotive equipment, i.e., sun screening, taillamp 'black out' lenses, neon license plate lamps, etc., is this allowed by the owner but prohibited installation by a commercial entity?

I am of the understanding that the CFR 48, Part 571.105 requires light transmission of 70% minimum (words illegible) is this correct? If this is correct and Texas law, VCS S701(illegible) Art. XII, Sec. 184(C), allows light transmission of only 35% (words illegible) action of Federal law? (Words illegible) Sec. 108 stated that if a Federal standard for any item of automotive equipment exists that standard will take precedence over any state standard and this section also empowers the Department (Texas Department of Public Safety) to control the sale and use of automotive equipment. If the state statutes are in error can that be remedied by the Federal Government? If so, how?

It doesn't seem realistic that every state could have different standards for automotive equipment, either new manufactured vehicles or after-market!

Your answers to these questions are awaited in ernest.

ID: nht73-1.42

Open

DATE: 05/18/73

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Signum Plastics

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of April 26, 1973, requesting that you be assigned a "DOT" code number for purposes of Motor Vehicle Safety Standard No. 205, "Glazing Materials". You state that you purchase acrylic plastic sheet from Thailand and Japan, and indicate that you are sole importers of this material.

Under paragraph S6 of Standard No. 205, the assignment of a code number is restricted to prime glazing material manufacturers, who are those manufacturers who either fabricate, laminate, or temper the glazing material. As you import only acrylic sheet, you are not a prime glazing material manufacturer, and the assignment of a code number to you is not appropriate.

I have enclosed a copy of marking requirements for glazing materials. Paragraph S6.2 requires a prime glazing material manufacturer to apply a code number, which is obtained upon written request to this agency, to that glazing designed as a component of any specific motor vehicle or camper. The code number requirement does not apply to glazing sheets not designed for a specific motor vehicle or camper. If you plan to import glazing material that is designed for a specific motor vehicle or camper, the prime manufacturer of that material, whether foreign or domestic, must apply for and receive a DOT code number.

Yours truly,

Enclosure

April 26, 1973

Administrator National Highway Traffic Safety Administration

Gentlemen:

We are requesting assignment of a D O T number, relative to Standard No. 205.

We purchase acrylic sheet plastic from Thailand and Japan, and are the sole importers of this material, as evidenced by the enclosed labels.

We are in the process of getting a registered trademark for this label.

Very truly yours,

SIGNUM PLASTICS --

Jack Molesworth, Partner

Encl.

ID: aiam2678

Open
Mr. James E. Reider, President, International Trade Group of Ohio, Inc., 100 East Broad Street, Columbus, OH 43215; Mr. James E. Reider
President
International Trade Group of Ohio
Inc.
100 East Broad Street
Columbus
OH 43215;

Dear Mr. Reider: This is in reply to your letter of October 14, 1977, to Don Williamso of our Ohio regional office.; You enclosed information on an automatic warning flasher lamp that i designed for installation on the parcel shelf inside the rear window of automobiles. You asked whether such a device would be legal on U.S. cars or U.S. highways, and 'what steps might be required to obtain an endorsement for the generic device from the N.H.T.S.A.'; The unit appears to be designed for sale as a motor vehicle accessor in the aftermarket. There are no Federal prohibitions against the sale of the warning device or its installation in motor vehicles. Whether it is legal to use such a device however is a question to be answered under the laws of the jurisdiction where the motor vehicle in which it is installed is registered and/or operated.; The NHTSA does not issue approvals or endorsements of propriety safet devices.; Yours truly, Frank Berndt, Deputy Chief Counsel

ID: aiam0823

Open
Mr. Trevor Williams, Service Manager, Rolls-Royce, Inc., P.O. Box 189, Paramus, New Jersey 07652; Mr. Trevor Williams
Service Manager
Rolls-Royce
Inc.
P.O. Box 189
Paramus
New Jersey 07652;

Dear Mr. Williams: This is in reply to your letter of May 19, 1971, concerning th placement of vanity mirror in sun visors. We apologize for our delay in responding to your letter. The issues it raised, however, are of consequence to manufacturers other than Rolls-Royce, and concerned basic matters of interpretation of Standard No. 201 which have only recently been resolved.; The National Highway Traffic Safety Administration has determined tha paragraph S3.4.1 of Standard No. 201 does not prohibit the installation by manufacturers of vanity mirrors on sun visors. Consequently, manufacturers are free to incorporate such mirrors into or onto sun visors, including mirror that are recessed into the surface of the visor as in the sample you enclosed.; Sincerely, Robert L. Carter, Associate Administrator, Motor Vehicl Programs;

ID: nht71-1.38

Open

DATE: 02/10/71

FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA

TO: Kelly Springfield Tire Company

TITLE: FMVSR INTERPRETATION

TEXT: This is in reply to your letter of February 2, 1971, concerning Part 574 - Tire Identification and Record Keeping regulations and to confirm that the date code may be placed at the end of the tire identification number by means of a screw as depicted in the sketch attached to your letter.

ID: aiam3374

Open
Mr. Clint Moye, Assistant Director, Motor Vehicle Division, State Revenue Department, Room 101, Trinity Washington Building, Atlanta, GA 30334; Mr. Clint Moye
Assistant Director
Motor Vehicle Division
State Revenue Department
Room 101
Trinity Washington Building
Atlanta
GA 30334;

This is in response to your request on the adequacy of the Georgi certificate of title for use in lieu of a separate Federal odometer form.; As you know, the Federal odometer requirements that became effective a of January 1, 1978, have been substantially increased. We have made provision for those states that wish to include odometer information on their titles to use a shortened form that was adopted by the American Association of Motor Vehicle Administrators (AAMVA). We consider the AAMVA form to include the minimum amount of information ncessary for an adequate disclosure.; In addition to the information included on the sample title which yo submitted to our office, the buyer's signature is also required. If this signature is included, the title may be used in lieu of a separate Federal form.; Sincerely, John Womack, Assistant Chief Counsel

ID: aiam2647

Open
Mr. Byron A. Crampton, Manager of Engineering Services, Truck Body & Equipment Assoc., Inc., 5530 Wisconsin Ave., Suite 1220, Washington, DC 20015; Mr. Byron A. Crampton
Manager of Engineering Services
Truck Body & Equipment Assoc.
Inc.
5530 Wisconsin Ave.
Suite 1220
Washington
DC 20015;

Dear Mr. Crampton: This responds to your July 22, 1977, request for clarification of m July 21, 1977, letter to you stating that, in the case of brake and axle modifications to change the function of a used vehicle from that for which it was originally manufactured, it is the NHTSA's view that degradation of the brake system would only occur as prohibited by the National Traffic and Motor Vehicle Safety Act (S 108(a)(2)(A)) if portions of the brake system originally installed are removed, disconnected, or otherwise rendered inoperative. You asked whether a change in 'function' of a vehicle would include a modification that simply increases the load-carrying capacity or stability of a vehicle to carry out the same task for which it was originally manufactured.; The answer to your question is no. In the NHTSA's view, the changes yo describe would only increase the capabilities of the vehicle to perform its originally manufactured function. Thus, the 'element of design' that constitutes the original braking system of the vehicle could be knowingly degraded by the installation of an additional axle that does not provide the capability that would have been required for it if installed in the new vehicle.; Sincerely, Joseph J. Levin, Jr., Chief Counsel

ID: nht78-2.30

Open

DATE: 09/22/78

FROM: AUTHOR UNAVAILABLE; Joseph J. Levin Jr.; NHTSA

TO: Fiat Research & Development - U.S.A. Branch

TITLE: FMVSR INTERPRETATION

TEXT: This responds to your June 16, 1978, letter asking whether a manufacturer is permitted to list on the certification label required by Part 567, Certification, the gross axle weight rating (GAWR) in kilograms as well as pounds. The National Highway Traffic Safety Administration has permitted the use of kilograms on the certification label as long as the label continues to list the GAWR in pounds also.

ID: nht78-4.1

Open

DATE: 03/09/78

FROM: AUTHOR UNAVAILABLE; John Womack; NHTSA

TO: The Reynolds and Reynolds Company

TITLE: FMVSR INTERPRETATION

TEXT: This is in response to your letter of February 3, 1978, requesting that the National Highway Traffic Safety Administration review your small Odometer Mileage Statement Form ODOM-1030N, your large Odometer Mileage Statement Form ODOM-105-N, and your Retail Buyers Order. It is our opinion that the forms which you submitted meet the Federal odometer requirements which became effective January 1, 1978. Thank you for your cooperation in preparing the forms.

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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