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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 12141 - 12150 of 16510
Interpretations Date
 search results table

ID: nht72-3.14

Open

DATE: 07/05/72

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Mr. Robert T. Sanders

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of June 1, 1972, requesting an interpretation as to the application of Federal Motor Vehicle Safety Standard No. 205. "Glazing Materials," to certain recreational vehicles and equipment, pictures of which you enclosed. These components consist of slide-in and chassis-mount campers, trailers, and motor homes.

In a recently issued amendment to Standard No. 205, the NHTSA has clarified the application of the standard to campers. As amended, the standard applies to campers, both slide-in and chassis-mount, that are designed to transport occupants while in motion. Accordingly, the pick-up cap which you illustrate appears to be except from the standard. In addition, Standard No. 205 does not apply to trailers, and would not apply to the fifth-wheel unit illustrated in the drawing forwarded to us.

With reference to the chassis-mount and slide-in campers, any window except forward facing windows, which include both front-facing windows and behind-the-cab windows, may be manufacturered of any glazing material (AS 1 through AS 11) specified in ARS Z26.1-1966, and two additional materials (Items 32 and 33), the requirements for which are specified in the recent amendment. With reference to forward-facing camper windows, all of the above materials may be used, except for AS 6 and AS 7 glazing materials, as specified in ANS Z26.1-1966 and item 13 glazing specified in the new amendment.

With respect to motor homes that are not campers, these vehicles are multipurpose passenger vehicles and must meet the glazing requirements for trucks. Accordingly, the windshield must be manufactured of either AS 1 or AS 10 glazing materials, side windows to the (immediate right or left of the driver must be either AS 1, AS 2, AS 10, or AS 11 materials, and other side windows must be either AS 1, AS 2, AS 3, AS 4, AS 5, AS 8, AS 9, AS 10, or AS 11 glazing materials. We would consider the overhead window in the motor home you (illustrate to be an "opening in the roof," and any of the materials allowed in side windows, or the materials allowed to be used by the recent amendment, may be (Illegible Word) in this location.

ID: nht72-3.15

Open

DATE: 06/12/72

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Silver-Top Manufacturing Co., Inc.

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of April 26, 1972, inquiring whether you are required to use "laminated safety glass" in the forward-facing window of a pickup cap. You indicate that this window is below the roof line of the cab of the pickup, immediately behind its rear window.

Under Federal Motor Vehicle Safety Standard No. 205, "Glaring Materials", (49 CFR 571.205, copy enclosed) windows in campers, pickup caps, pickup canopies, and pickup covers must be manufactured of safety glazing material specified in the standard, Forward-facing windows such as the one you describe must be manufactured of either AS1, AS2, AS3, AS4, or AS5 glazing materials, as those materials are described in the American National Standards Institute Test E26.1-1966. Materials other than "laminated safety glazing" may be used to meet each of these "AS" categories, and we refer you to ANS Test 226.1 for specific requirements.

ID: nht72-3.16

Open

DATE: 05/08/72

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Temptation Mfg. Co.

TITLE: FMVSS INTERPRETATION

TEXT: This is in response to your undated letter, which we received on March 22, 1972, in which you ask what NHTSA requirements are applicable to a truck cover you manufacture, enclosing a picture.

The picture appears to show a cover designed for installation over the back of a pickup truck. If this unit is not designed to carry persons when the truck is in motion, there are no requirements applicable to it. If, however, it is designed to transport persons, the glazing materials (glass and plastics) used in it must conform to Motor Vehicle Safety Standard No. 205, "Glazing Materials," (copy enclosed). In addition, the unit must also be certified as conforming to the standard in accordance with section 114 of the National Traffic and Motor Vehicle Safety Act and the enclosed NHTSA notice of November 4, 1967.

The ASA Test 226.1-1966 that is incorporated into Standard No. 206 can be obtained from the American National Standards Institute, 1430 Broadway, New York, New York 10018.

ID: nht72-3.17

Open

DATE: 02/16/72

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Compact Corporation

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of December 29, 1971, concerning the use of glazing materials in the Kangaroo Camper which your company manufactures. You ask whether Motor Vehicle Safety Standard No. 205, "Glazing Materials" (49 CFR @ 571-205) applies to this item.

Because it is impossible for a person to ride in the Kangaroo camper while the vehicle is in motion, we would not consider this item to be a "camper" within the meaning of Standard No. 205, and the standard does not apply to this product.

ID: nht72-3.18

Open

DATE: 05/31/72

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: GO Industries

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of April 26, 1972, requesting an opinion as to whether "Abcite," a product of the Dupont Company, may be used in campers and "mini-mobile homes."

Whether a particular glazing material may be used in motor vehicles or campers depends upon whether the material meets the requirements of Motor Vehicle Safety Standard No. 205, "Glazing Materials" (49 CFR 571.205), which incorporates, as you indicate, the American National Standards Institute Standard Z26.1-1966. That standard also specifies the locations in motor vehicles where specific materials may be used.

Standard No. 205 does not apply to trailers. While we are not familiar with the phrase "mini-mobile home," we consider mobile homes to be trailers, and the standard does not apply to them. With respect to campers, Standard No. 205 allows the use of any material meeting the requirements of Z26 in any location except for forward-facing windows. Forward-facing camper windows may not be manufactured of item 6 and item 7 material (AS6, AS7), but may be manufactured of any of the other materials (AS1-AS5, AS8-AS11) that meets the requirements of Z26.

Whether Abcite conforms to the requirements for glazing allowed to be used in campers is a determination that should be made in the first instance by its manufacturer, Dupont. If the manufacturer determines that such use is within the requirements of Standard No. 205, he is required by section 114 of the National Traffic and Motor Vehicle Safety Act to certify that the material conforms to the requirements of the standard. He is also required by the marking requirements in Section 6 of Z26.1-1966 to indicate on the material its AS designation. Any material that is so certified can be used in the camper locations listed on the standard as appropriate for that designated type.

ID: nht72-3.19

Open

DATE: 01/13/72

FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA

TO: Libbey-Owens-Ford Company

TITLE: FMVSS INTERPRETATION

TEXT: You have requested that Libbey-Owens-Ford Company be exempted from the requirements of Part 566. Your request is denied for the reasons set forth below.

You state that Libbey-Owens-Ford is a manufacturer of automotive safety glass which has been assigned a DOT number under the "certification alternative" of Standard No. 203. You draw an analogy to the exemption of tire manufacturers from the manufacturer identification regulation, based on your (Illegible Word) under other NHTSA regulations to submit (Illegible Words) meets the requirements of Part 566.

However, the analogy is incorrect in that manufacturers of glassing materials are not specifically required by Standard 205 to submit the data required by Part 566. If manufacturers meet the certification requirements of $ 114 of the Act, no admittal of information is required. If they do choose the certification alternative, as Libbey-Owens-Ford has done, it is still not clear that the requirements of Part 566 will be met.

By contract, under Part 574 submittal of information is (Illegible Word) for all covered tire manufacturers. Moreover, that regulation in its "Identification mark" occasion requires submittal of specific information which has been found to meet the requirements of Part 566.

The purpose of Part 566 is to establish a centrally organized system to collect information regarding the manufacturer's corporate status, mailing address, and items manufactured. Such a system has been found necessary for efficient enforcement of the Act as well as distribution of information to manufacturers. These purposes cannot be accomplished if individual manufacturers in particular industries are greater exemption from coverage.

ID: nht72-3.2

Open

DATE: 04/28/72

FROM: AUTHOR UNAVAILABLE; Douglas W. Toms; NHTSA

TO: National Tire Dealers & Retreaders Association, Inc.

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of April 5, 1972, concerning the amendment to Motor Vehicle Safety Standard No. 117, published March 23, 1972 (Docket 1-8; Notice 7, 37 F.R. 5950). In your letter you protest against the labeling requirements of the standard. It is not clear from your letter, however, whether you are referring to both the requirements for affixed labels (S6.3.1), or for permanent labeling (S6.3.2), or both, and as a consequence we have treated your comments as referring to the labeling requirements in general.

You state in your letter that retreaders, particularly small retreaders, cannot meet the labeling requirements "on any reasonable and practical basis." You state further that you have demonstrated how the labeling requirements will force retreaders to hire additional personnel, increase production time, and consequently increase the retreaders' cost per tire. You also claim that the labeling issue is a "fairly simple problem" whose solution can be easily found within the statutes.

Congress, in enacting section 201 of the National Traffic and Motor Vehicle Safety Act, made it clear that motor vehicle tires should be permanently labeled with specific items of information dealing with their safe use. The labeling requirements of Standard No. 117 are based on this statutory mandate and do recognize and allow for difficulties retreaders might have in meeting all of the requirements for labeling set forth in section 201. For example, Standard No. 117, in not requiring that the generic name of the cord material or the actual number of plies be included in the labeling information for retreaded tires, recognizes that this information will not be available for some casings which are allowed to be used.

The NHTSA considers the labeling requirements of Standard No. 117 to be both reasonable and practical, and believes they can be met by the overwhelming majority of retreaders, if not all, in an economical manner. Each item of information is now available to the retreader should the need to relabel arise. By using the procedures and technology developed for compliance with the Tire Identification and Recordkeeping regulations (49 CFR Part 574), by combining labeling information on the same label where appropriate, and by careful sorting of casings before retreading, the NHTSA believes that even the smallest retreader can meet these requirements. While the requirements will no doubt cause some changes in existing production techniques, with a possible slowing initially of the production process, there is no reason to believe that these changes, once instituted, will result in significant permanent increases in the costs and time needed for the production of retreaded tires.

Finally, you cite figures showing what you claim is an abnormally high number of retreaded tire manufacturers who have gone out of business in the past year, and ask, "How many more will be lost before we get reasonable and practical and understandable regulations?" We understand your concern for retreading companies that have gone out of business. But since Standard No. 117 has not yet become effective, these closings are obviously not the result of NHTSA regulations.

ID: nht72-3.20

Open

DATE: 12/01/72

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Trailer Coach Association

TITLE: FMVSS INTERPRETATION

TEXT: This is in further reply to your letter of August 17, 1972. We indicated in a letter to you of September 8, 1972, that we would respond to your letter when action on petitions for reconsideration of the June 21, 1972, amendment to Standard No. 205 had been completed. Notice of our action has now been published 137 F.R. 24035, November 11, 1972) and a copy is enclosed.

Based upon the November 11, 1972, notice, your conclusions regarding the requirements for certification and marketing by prime glazing material manufacturers (paragraph 3.2 of your letter) are for the most part correct. These manufacturers must mark glazing materials in accordance with Section 6 of ANS (Illegible Word). They must also certify. The certification must be made by the addition of the symbol DOT and assigned code number only when the glazing is designed as a component of any specific motor vehicle or camper. In other cases certification may be accomplished by any method meeting the requirements of section 114 of the National Traffic and Motor Vehicle Safety Act (13 U.S.C. 1403). It may not be accomplished, however, by affixing the DOT and code number.

Your conclusions regarding certification and marking requirements for persons who cut glazing material from larger sheets (paragraph 3.1 of your letter) are not entirely correct. It is true that such persons must also certify, and that the method for certification may be any that satisfies the requirements of section 114 of the Act. Affixing a label to the material is one such method. You are incorrect, however, in your conclusion that the material need not contain the markings of the prime manufacturer. Section 6 of ANS %26 requires glazing cut from larger pieces to contain the markings of the manufacturer of the larger piece. As clarified in the notice of November 11, 1972, this requirement is still applicable.

ID: nht72-3.21

Open

DATE: 07/24/72

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Argo Plastic Company

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of June 27, 1972, requesting Federal "approval" for plastic glazing material you manufacture. You enclose copies of certificates showing approval by the State of California.

The NHTSA does not provide approvals for glazing materials subject to its requirements. Those requirements are found in Federal Motor Vehicle Safety Standard No. 205, "Glazing Materials," and apply to glazing materials for use in motor vehicles manufactured for sale to the United States. (This includes the 50 States, the District of Columbia, Puerto Rico, Guam, the Virgin Islands, the Canal Zone, and American (Illegible Word), and not 37 States as you mentioned.)

Under the National Traffic and Motor Vehicle Safety Act (18 U.S.C. 1381 et seq.) manufacturers must use due care to ensure that products they manufacture conform to applicable standards (15 U.S.C. 1397 (a)(2)). The manufacturer must certify conformity as specified in section 114 of the Act (15 U.S.C. 1403), and in the case of Standard No. 205, as specified in the standard. The NHTSA does not approve manufacturers' products or their certification, but monitors compliance with the standards by purchasing materials on the open market, and testing them to the requirements of the standard. The failure of materials to conform can result in the imposition of civil penalties against the manufacturer, and other sanctions (15 U.S.C. 1398, 1399).

A copy of Standard No. 205 and the National Traffic and Motor Vehicle Safety Act are enclosed for your information.

Enclosures

ID: nht72-3.22

Open

DATE: 11/15/72

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Philips Industries Inc.

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of October 5, 1972, concerning the manufacture of storm windows for use in recreational vehicles. You refer to our letter to Mr. Bob Sanders of your company (our records show the date of the letter to be July 5) in which we outlined the requirements for glazing materials used in various locations in recreational vehicles, and ask whether storm windows used in these locations must meet the same requirements.

The answer is yes. Storm windows for use in motor vehicles must meet the same requirements as other glazing materials, according to their location in the vehicle.

I have enclosed a copy of our Response to Petitions for reconsideration concerning the latest amendment to Standard No. 205.

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.