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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 16491
Interpretations Date

ID: aiam1150

Open
Mr. Thomas Pieratt, Truck Equipment & Body Distributors Assoc., 602 Main Street, Cincinnati, OH 45202; Mr. Thomas Pieratt
Truck Equipment & Body Distributors Assoc.
602 Main Street
Cincinnati
OH 45202;

Dear Mr. Pieratt: This is in reply to your letter of May 11, 1973, in which you ask abou the certification responsibilities for consecutive manufacturers of certain multi-stage vehicles that are intended for use by utilities. The facts as you present them are that a chassis-cab is purchased by a customer and delivered to a utility distributor, who installs a sub-base and a digger-derrick. The truck is then sent to a body-builder who installs a body consisting essentially of storage compartments, which are used to carry personal tools. The compartments are installed to the floor installed by the utility distributor. The unit is then returned to the utility distributor, who installs clearance and other lamps, reflectors, and other accessories, and hooks up hydraulic lines. Smaller vehicles are described as being manufactured in essentially the same manner.; It appears to us that the manufacturing operations you have describe fit quite readily into the manufacturing categories established by Parts 567 and 568. The utility equipment distributor is an intermediate manufacturer, he performs manufacturing operations, but does not complete the vehicle, as further manufacturing operations, the installation of the body, are clearly contemplated for the vehicle to perform its intended function. The body-builder is the final-stage manufacturer. When he completes his work the vehicle is ready to perform its intended function, except for the addition of the lighting equipment and the other operations performed by the utility equipment distributor. These latter operations appear to involve 'readily- attachable components' and if so the party performing them would not be a final-stage manufacturer.; The certification requirements do not operate differently because, i the case you describe, the utility equipment distributor performs operations on the vehicle at two separate times (installing the derrick, and later the lighting). His responsibilities each time are governed by the operation he then performs. However, inasmuch as the utility distributor appears to perform much of the heavy manufacturing, and because he is also the last person to modify the vehicle, he may wish to assume the responsibility for certification under section 568.7(b), in order that he may affix his name as the manufacturer to the certification label.; Yours truly, Richard B. Dyson, Assistant Chief Counsel

ID: aiam1151

Open
Mr. Thomas Pieratt, Truck Equipment & Body Distributors Assoc., 602 Main Street, Cincinnati, OH 45202; Mr. Thomas Pieratt
Truck Equipment & Body Distributors Assoc.
602 Main Street
Cincinnati
OH 45202;

Dear Mr. Pieratt: This is in reply to your letter of May 11, 1973, in which you ask abou the certification responsibilities for consecutive manufacturers of certain multi-stage vehicles that are intended for use by utilities. The facts as you present them are that a chassis-cab is purchased by a customer and delivered to a utility distributor, who installs a sub-base and a digger-derrick. The truck is then sent to a body-builder who installs a body consisting essentially of storage compartments, which are used to carry personal tools. The compartments are installed to the floor installed by the utility distributor. The unit is then returned to the utility distributor, who installs clearance and other lamps, reflectors, and other accessories, and hooks up hydraulic lines. Smaller vehicles are described as being manufactured in essentially the same manner.; It appears to us that the manufacturing operations you have describe fit quite readily into the manufacturing categories established by Parts 567 and 568. The utility equipment distributor is an intermediate manufacturer, he performs manufacturing operations, but does not complete the vehicle, as further manufacturing operations, the installation of the body, are clearly contemplated for the vehicle to perform its intended function. The body-builder is the final-stage manufacturer. When he completes his work the vehicle is ready to perform its intended function, except for the addition of the lighting equipment and the other operations performed by the utility equipment distributor. These latter operations appear to involve 'readily- attachable components' and if so the party performing them would not be a final-stage manufacturer.; The certification requirements do not operate differently because, i the case you describe, the utility equipment distributor performs operations on the vehicle at two separate times (installing the derrick, and later the lighting). His responsibilities each time are governed by the operation he then performs. However, inasmuch as the utility distributor appears to perform much of the heavy manufacturing, and because he is also the last person to modify the vehicle, he may wish to assume the responsibility for certification under section 568.7(b), in order that he may affix his name as the manufacturer to the certification label.; Yours truly, Richard B. Dyson, Assistant Chief Counsel

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: 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: 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.

ID: nht68-1.48

Open

DATE: 01/12/68

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

TO: Road and Track

TITLE: FMVSR INTERPRETATION

TEXT: In response to your letter of December 19 to Mr. Boaz regarding the proposed regulations governing the importation of motor vehicles and how they affect racing cars, I enclose a copy of the final regulations which are now in effect. You will see that 19 C.F.R. 12.80(b)(7) permits importation of noncomplying motor vehicles for purposes of competition if they are not licensed for use on the public roads.

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: nht71-1.30

Open

DATE: 12/06/71

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Auto Sun Products Company

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of November 16, 1971, on behalf of Kangol Magnet, Ltd., in which you requested our opinion on the number of identifying labels required on a sent belt assembly by Standard No. 209. It is our opinion that the marking requirement of that standard (S4.1(k)) is satisfied by one permanent marking or label on each assembly and that it does not require each component of an assembly to be separately marked.

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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