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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 9031 - 9040 of 16517
Interpretations Date

ID: nht71-5.29

Open

DATE: 12/22/71

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

TO: Holophane Company, Inc.

TITLE: FMVSS INTERPRETATION

TEXT: This is in response to your letter of December 13, 1971, in which you made further comments on the requirements of Standard No. 108 with respect to school bus lighting. You expressed concern over the fact that a company holds a patent relating to the wiring for eight-lamp systems that are permitted (though not required) under Standard No. 108.

Although the existence of patents is one factor that may be taken into account in setting motor vehicle safety standards, it is not the primary one. This agency is charged by Congress with the responsibility of setting standards that represent the best possible resolution of the problems of safety, cost, and technological feasibility. If two alternative regulatory courses of action are found to be substantially equal in other respects, the agency might prefer the one in which the largest number of companies were free to compete at will. But the granting of patents is a long-established policy of our government, administered by the U.S. Patent Office under the direction of Federal statutes and the Constitution. We do not, therefore, agree with your suggestion that it is "against public interest" to issue regulations that have the incidental effect of favoring or requiring the use of patented products.

ID: nht71-5.3

Open

DATE: 11/18/71

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Recreational Vehicle Institute, Inc.

TITLE: FMVSS INTERPRETATION

TEXT: As we have advised Ed Bernett of your office from time to time during the fall, a response to your letter on the treatment of removable foam seat cushions under Standard No. 207 has been under review for some time.

Standard No. 207 is essentially a test of the strength of the seat structure. As such it does not prohibit the use of removable seat cushions of the type described in your letter.

We consider it to be the intent of the standard, however, that when the momentum of a cushion is transferred in any way to the seat structure during the course of an acceleration in a given direction, the weight of the cushion must be added to the weight of the seat structure in calculating the force to be applied in that direction under 84.2 and 34.3.2.

ID: nht71-5.30

Open

DATE: 12/27/71

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Angle Product Company

TITLE: FMVSS INTERPRETATION

TEXT: This is in further response to the telephone inquiries you made on December 14, 1971, concerning the effective date of Federal Motor Vehicle Safety Standards 206 with respect to trucks.

You stated that you understood that the original January 1, 1972, effective date had been or would be postponed to September 1, 1972. No such postponement has been made or proposed. The standard will go into effect with respect to trucks on the first of this coming year, as originally scheduled.

Your source of information may have confused the effective date of the standard with that of a minor proposed amendment to the standard. That amendment, which was to become effective on January 1, 1972, is now scheduled to become effective September 1, 1972. A copy of that proposed amendment is enclosed for your information.

You also asked about the existence of a mailing list which would enable you to receive our new standards and amendments to our existing standards. The Government Printing Office periodically publishes supplements to a loose-leaf publication entitled "Federal Motor Vehicle Safety Standard and Regulations." The most recent supplement, number 5, was published in November of this year. Detailed information concerning this service, including its cost, can be obtained from the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402.

If you wish to receive our proposed, as well as our final, new standard and amendments, you should consider subscribing to the Federal Register. A year's subscription to this publication, which cost $ 25.00, can be ordered from the Superintendent of Documents.

Please write if we can be of further assistance.

ENC.

ID: nht71-5.31

Open

DATE: 12/27/71

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Crane Carrier Company

TITLE: FMVSS INTERPRETATION

TEXT: This is in response to your letter of November 16 and 30, 1971, concerning the application of Federal Motor Vehicle Safety Standard No. 206 to heavy duty trucks. You reported that you are unlikely to be able to bring the side door locks and latches on your truck into conformity with the standard until mid-1972.

In your first letter, you asked whether the standard will apply to all trucks or only those having a GVWR of more than 10,000 pounds. The standard will apply, beginning January 1, 1972, to all trucks without regard to their GVWR.

In your second letter, you requested for your trucks a temporary exemption of 180 days from the standard. We regret that we are unable to consider your request, since our authority under section 123 of the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1410) to grant such exemptions expired in April of this year.

Beginning January 1, 1972, the manufacture of any truck not in compliance with Standard 206 will be prohibited. Section 108(a) of the Act provides that

"No person shall manufacture for sale . . . any motor vehicle . . . manufactured on or after the date any applicable . . . standard takes effect . . . unless it is in conformity with such standard . . ." (15 U.S.C. 1397)

This prohibition is enforceable by civil penalties under section 109 (15 U.S.C. 1398) and injunction under section 110 (15 U.S.C. 1399). In addition, in the event that a noncompliance were determined to be a safety-related defect, notification of the defect would have to be furnished under section 113 (15 U.S.C. 1402).

Let us know if we may be of further assistance.

ID: nht71-5.32

Open

DATE: 12/28/71

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: U.S. Suzuki Motor Corporation

TITLE: FMVSR INTERPRETATION

TEXT: This is in reply to your letter of November 17, 1971, enclosing copies of consumer information documents you plan to use to comply with the Consumer Information requirements applicable to motorcycles. You state that you plan to place the information for particular models back to back on the same sheet of paper in order that they may correspond to your specification sheets.

The documents you have submitted, when they contain the appropriate values, will comply with the Consumer Information regulations. There is no prohibition against placing the information for two models back to back on the same sheet as you plan to do.

We are pleased to be of assistance.

ID: nht71-5.33

Open

DATE: 12/27/71

FROM: R. L. CARTER -- NHTSA; SIGNATURE BY E. DRIVER

TO: American Safety Belt Council

TITLE: FMVSS INTERPRETATION

TEXT: Thank you for your letter of December 3, 1971, regarding seat belt buckle requirements.

Your interpretation that push-button buckles are not mandatory on seat belts offered for sale as replacement parts after January 1, 1972, is correct. Federal Motor Vehicle Safety Standard No. 208, Occupant Crash Protection, specifies that seat belts, installed in passenger cars after January 1, 1972, must have latch mechanisms that release by push-button action. It does not apply to replacement belts.

If we can be of further assistance, please do not hesitate to contact us.

ID: nht71-5.34

Open

DATE: 12/29/71

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

TO: National Committee on Uniform Traffic Laws and Ordinances

TITLE: FMVSS INTERPRETATION

TEXT: This is in response to your letter of March 3, 1971, concerning the preemption of State vehicle safety standards under section 103(d) of the National Traffic and Motor Vehicle Safety Act, 15 U.S.C. 1592(d). We apologize for the oversight that resulted in not answering the letter until this date.

You asked whether State laws requiring that vehicles having two red tail lamps, mounted on the same level and as widely spaced laterally as practicable, are preempted by Motor Vehicle Safety Standard No. 108. In our opinion the answer is no. Standard 108 has many detailed requirements that go beyond those described. Among them, however, are requirements that are substantively identical to your example, though not stated in precisely the same words. We do not interpret section 103(d), which prohibits a State standard "which is not identical to the Federal standard," as requiring the State requirement to be a verbatin copy of its Federal counterparts substantive identity of requirements is sufficient. Also, we do not interpret the statute as requiring the State to adopt all the Federal requirements on a given aspect of performance. It is sufficient that there be a Federal requirement that is substantively identical to the State requirement in question.

You also asked about two other requirements, as to which the answer may depend on a more detailed examination of their purposes and the circumstances under which they are enacted. One was the requirement that the light from the tail lamps be visible from a distance of 1,000 feet to the rear; the other was that a vehicle have "at least one tail lamp."

The guiding principle that we would apply to this situation is that State requirements that regulate the design of motor vehicles must be identical to the Federal standards, with the qualifications stated above. It was clearly the intent of Congress to provide for uniformity of regulation of the manufacturers in areas where the Federal agency has acted, and they did so by the identity requirement of section 103(d). By contrast, State requirements concerning the condition or adjustment of vehicles generally do not affect the requirements placed on manufacturers, and therefore do not fall within the section 103(d) identity provisions.

Applying this principle to your question, if the visibility requirement is construed by the State, and reasonably appears, to be basically a quantitatively stated requirement that the tail lamps be in good working order and not nearly degraded by conditions encountered in use, we would consider the requirement not to be preempted by section 103(d). Similarly, if the one tail lamp requirement is essentially a statement of required minimum working condition (as it appears to be on its face), it would not be preempted.

The issue you mentioned concerning the preemption of State laws applicable to vehicles in use was dealt with in detail in(Illegible Word). Tens' letter to you of December 21, 1970. As stated in that letter, our position is that the preemption question does not turn on whether the State law applies to pre-sale or on-the-road vehicles, and we feel that this position was upheld by the clear and compelling implication of the Super Lite cases. In light of the interpretations set forth in this letter, however, we do not believe that the problems of State law and enforcement that you felt may arise will be realized.

ID: nht71-5.35

Open

DATE: 12/29/71

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Hackney Bros. Body Company

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of December 6, 1971, in which you requested our opinion on the application of Standard No. 207 to swivel type pedestal seats.

Your problem arises from the method specified in S5.1.1 for the application of the force required by S4.2(a) of 20 times the weight of the seat. Although your letter does not state the problem directly, it appears that when a forward force is applied from behind the seat, as shown in the figures accompanying S5.1.1, the seat will tend to swivel. Your solution is to attach a T-shaped structure to the seat and to apply the force to the leg of the T forward of the swivel point.

The initial question raised by your letter is whether a seat that swivels under the application of a force through its back as shown in Figure 1, will be considered to fail to withstand the force and thereby fail the standard.

On the basis of our present information, we cannot say that such a swiveling action would result in a failure of the standard. The engineering staff has expressed uncertainty as to the effects on the occupant if the seat swivels in a side or angular crash, but they are not prepared to say that it would present a hazard. Since the swiveling itself is not a failure, the remaining question is one of test procedure. Our opinion is that the procedure you describe, using a T shaped structure, appears to be an acceptable means of applying the test force to the seat.

ID: nht71-5.36

Open

DATE: 12/30/71

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Latham & Watkins

TITLE: FMVSR INTERPRETATION

TEXT: This is in reply to your letter of November 16, 1971, in which you ask whether a manufacturer may add certain statements to the Certification label required pursuant to Part 567 of Title 49, Code of Federal Regulations. You state that the manufacturer in question is engaged in the manufacturer and mounting of concrete mixer assemblies. Because, as you state, the weight of the concrete may vary according to the mix formula, and because the volume of mix loaded into a mixer can also vary, the manufacturer wishes to add to his Certification label a declaration of the vehicle's cargo load and an indication of the maximum volume of mix that could be safely hauled within the rated cargo load limit.

There is no prohibition to this additional information being added to the Certification label as long as (1) it appears after the required information, and (2) it is stated in such a way that it cannot be confused with the information, particularly the GVWR and GAWR, required to be placed on the label.

We are pleased to be of assistance.

ID: nht71-5.37

Open

DATE: 09/30/71

FROM: AUTHOR UNAVAILABLE; Robert L. Carter; NHTSA

TO: Mercedes Benz of North America

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of August 20, 1971, in which you asked whether the shoulder belt anchorages installed by Mercedes in its heavy trucks (over 10,000 CVWR) must meet the strength requirements of Standard No. 210, even though the standard does not require shoulder belt anchorages in vehicles over 10,000 pounds GVWR.

It is our opinion that because these anchorages are not required to be installed, they are not required to meet the strength requirements of Standard No. 210. You may therefore continue to use plastic covers on the anchorages and need not redder them unusable.

Please advise us if you have further questions.

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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