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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 3901 - 3910 of 6047
Interpretations Date

ID: nht71-4.24

Open

DATE: 10/14/71

FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA

TO: FWD Corporation

TITLE: FMVSS INTERPRETATION

TEXT: In response to your letter of September 15, 1971, requesting our interpretation of certain motor vehicle safety standards and regulations:

1. Federal Motor Vehicle Safety Standard No. 208, "Occupant Crash Protection," as amended at 36 F.R. 4600 (March 10, 1971). If trucks over 10,000 pounds CV-R are equipped with a seat belt system as in paragraph S4.3.2, the vehicles need not meet the requirements of paragraphs S5 and S6, which apply only when the complete passive protection system option of paragraph S4.3.1 is adopted. Of course, the seat belt system must conform to the seat belt assembly requirements of Federal Motor Vehicle Safety Standard No. 209, "Seat Belt Assemblies."

2. Federal Motor Vehicle Safety Standard No. 206, "Door Locks and Door Retention Components." Your interpretation of the standard's coverage is correct: there are no requirements in the standard for the installation of the latches and hinges.

3. Part 573, "Defect Reports," S6 F.R. 3064 (February 17, 1971). The National Traffic and Motor Vehicle Safety Act and our regulations do not require manufacturers to repair defective motor vehicles. Manufacturers are therefore free to make whatever arrangements for repair of defects they wish. Of course, we hope that in making such arrangements the manufacturers will assume the responsibility of assuring that the repairs are made properly.

ID: nht71-4.47

Open

DATE: 11/13/71

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

TO: The Commonwealth of Massachusetts

TITLE: FMVSS INTERPRETATION

TEXT: Thank you for your letter of September 17, 1971, asking if present Federal regulations would preempt the Massachusetts requirement that certain outside rearview mirrors be provided with reflective material over the rear surface.

Section 103(d) of the National Traffic and Motor Vehicle Safety Act, 15 U.S.C. 1392(d), states in pertinent part:

"Whenever A Federal motor vehicle safety standard . . . is in effect, no State . . . shall have any authority . . . to establish . . . with respect to any motor vehicle or item of motor vehicle equipment any safety standard applicable tot he same aspect of performance of such vehicle or item of equipment which is not identical to the Federal standard."

Federal Motor Vehicle Safety Standard No. 108, Lamps, Reflective Devices, and Associated Equipment, establishes requirements for reflective materials used on motor vehicles. The NHTSA considers this standard to include within its scope all reflective materials required to be used on motor vehicles to which it applies. Any State requirements that have the effect of regulating such reflective materials must therefore be identical to the relevant provisions of Standard No. 108. The Massachusetts statute that you have brought to our attention is not identical to the Federal standards relating

to that aspect of performance, and must therefore be considered to be invalidated by the operation of the National Traffic and Motor Vehicle Safety Act.

ID: nht71-5.23

Open

DATE: 12/14/71

FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA

TO: FWD Corporation

TITLE: FMVSS INTERPRETATION

TEXT: In response to your letter of September 15, 1971, requesting our interpretation of certain motor vehicle safety standards and regulations:

1. Federal Motor Vehicle Safety Standard No. 206, "Occupant Crash Protection," as amended at 36 F.R. 4600 (March 10, 1971). If trucks over 10,000 pounds(Illegible Word) are equipped with a seat belt system(Illegible Word) in paragraph S4.3.2, the vehicles need not meet the requirements of paragraphs S5 and S6, which apply only when the complete passive protection system option of paragraph S4.3.1 is adopted. Of course, the seat belt system must conform to the seat belt assembly requirements of Federal Motor Vehicle Safety Standard No. 209, "Seat Belt Assemblies."

2. Federal Motor Vehicle Safety Standard No. 206, "Door Locks and Door Retention Components." Your interpretation of the standard's coverage is correct: there are no requirements in the standard for the installation of the latches and hinges.

3. Part 573, "Defect Reports," 36 F.R. 3064 (February 17, 1971). The National Traffic and Motor Vehicle Safety Act and our regulations do not require manufacturers to repair defective motor vehicles. Manufacturers are therefore free to make whatever arrangements for repair of defects they wish. Of course, we hope that in making such arrangements the manufacturers will assume the responsibility of assuring that the repairs are made properly.

ID: nht73-3.26

Open

DATE: 02/14/73

FROM: AUTHOR UNAVAILABLE; Douglas W. Toms; NHTSA

TO: Commonwealth of Pennsylvania

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of December 27, 1972, concerning the absence from Motor Vehicle Safety Standard No. 208 of requirements for seat belts after the passive restraint requirements become effective.

Our aim in the last three years has been to improve the protective capabilities of the autombile so that it will automatically protect its occupants from serious injury and death. We do not intend in the least to disparage seat belts -- to the contrary, we are making every effort to encourage their use. However, as passive restraints are installed, the marginal benefits to be gained from belts do not appear to be great enough to justify keeping them as required equipment.

The impacts that particularly concern you -- those occurring between 90 degrees and 270 degrees -- are partially covered by the lateral impact test of Standard 208. Impacts in which the force is more nearly rearward are the subject of continuing investigation by our Research Institute, with a view toward possible improvements in the rear-end structure. If standards are proposed concerning rear impact protection, they will probably focus on improved seat structure or on rear-end modifications rather than on seat belts.

We think the course we are following will result in significantly increased protection for the motoring public.

ID: nht73-5.12

Open

DATE: 09/25/73

FROM: AUTHOR UNAVAILABLE; R. B. Dyson; NHTSA

TO: Crown Coach Corporation

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of August 28, 1973, concerning the effective date of Motor Vehicle Safety Standard No. 121. Your direct question is whether the effective date is the starting or completion date for the vehicle's components or the starting date for the vehicle.

Standard No. 121 applies to the vehicle and its effective date therefore relates to the vehicle, rather than to any of its components. A vehicle completed after the effective date will have to meet the standard, even though it is equipped with a foundation brake system that was manufactured before the effective date.

The vehicle's completion date, rather than its starting date, is the date that determines whether it must conform to the standard. If your company manufactures its vehicles from the ground up, rather than installing a body on a vehicle built by another manufacturer, the relevant completion date is the date you complete your manufacturing operation. However, if you buy an incomplete vehicle, as defined in our regulation on vehicles manufactured in two or more stages (49 CFR Part 568), and complete that vehicle, you may choose as the completion date for purposes of Standard No. 121 the date on which the manufacturer of the incomplete vehicle finished his work, the date on which you completed the vehicle or any date in between.

ENC.

ID: nht73-5.16

Open

DATE: 04/12/73

FROM: AUTHOR UNAVAILABLE; R. B. Dyson; NHTSA

TO: District Director of Customs

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of March 15, 1973, to Mr. Armstrong asking "whether a hub cap with a wing type attachment is subject to Standard 211."

Standard No. 211 prohibits wheel discs, wheel nuts, and hub caps that incorporate winged projections. The item that you enclosed appears to be a wheel spinner which, when attached to a wheel disc or hub cap would create an assembly incorporating a winged projection in violation of Standard No. 211. The item itself is not literally prohibited by the standard, but it evidently has no function apart from this end use. I am therefore of the opinion, if the same source is separately shipping spinners and wheel discs/hub caps to which the spinner may be attached, that these items may be refused entry into the United States.

THE DEPARTMENT OF THE TREASURY

BUREAU OF CUSTOMS LOS ANGELES, CALIF.

MAR 15 1973

Francis Armstrong, Director Office of Standards Enforcement Motor Vehicle Programs National Highway Traffic Safety Administration

A question has arisen as to whether a hub cap with a wing type attachment is subject to Standard 211 of the National Traffic Motor Vehicle Safety Act.

A sample of the subject hub cap is forwarded for your inspection and decision.

C. A. MCGONIGLE Senior Import Specialist

Encl.

ID: nht73-5.19

Open

DATE: 03/09/73

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: General Motors Corporation

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of February 8, 1973, concerning the use of a "comfort clip" on the shoulder belt portion of GM's 1974 seat belt system.

In response to questions from other manufacturers concerning the use of high friction buckles in continuous loop belt systems, we have indicated that the requirement of Standard 208 that the belts adjust to fit specified occupants precludes the use of such buckles. In the case of systems with separate lap and shoulder belt retractors, however, the shoulder belt does not affect the tension in the lap belt and therefore does not present the risk of submarining that exists with the single loop systems. Accordingly, we are of the opinion that a comfort clip would be acceptable under S7.1.1 of the standard, so long as the shoulder belt is otherwise capable of adjustment as required by S7.1.1.

At a meeting with you on this subject on January 24, 1973, the NHTSA expressed its concern about possible reductions in shoulder belt effectiveness due to excessive belt slack. On the whole, we find that this possibility is more than offset by the prospects of greater usage due to the added convenience of the system with the clip. However, we strongly support your proposal to include instructions for the use of the clip both on the clip itself and in the owner's manual.

ID: nht73-5.30

Open

DATE: 10/26/73

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Nissan Motor Co., Ltd.

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of September 25, 1973, asking whether the fuel spillage measurement specified in Standard No. 301 is an average rate of one onunce per minute (your Item A) or an actual rate. (Your Item B)

Your item B is correct. Fuel spillage shall not exceed one ounce per minute in any one of the fifteen minutes of the observed period.

YOURS TRULY,

NISSAN MOTOR CO., LTD.

September 25, 1973

Lawrence Schneider Chief Council National Highway Traffic Safety Administration

This is to ask your interpretation regarding the test procedures of MVSS 301 Fuel System Integrity published in Federal Register, Vol. 38, No. 160 (Docket No. 70-20) on August 20, 1973.

We feel that the fuel spillage requirement following cessation of vehicle motion of S.5.4 has the following two meanings:

A) The calculated fuel spillage rate.

Total amount of fuel spillage (oz.)

B) The measured fuel spillage rate every minute. All of the collected fifteen one-minute timed samples shall not exceed one ounce per minute.

We would like to know which definition is correct understanding. Your prompt reply would be greatly appreciated.

Very Truly Yours,

Tatsuo Kato

ID: nht91-1.38

Open

DATE: February 11, 1991

FROM: Delbert N. Pier -- Legislation and Compliance Coordinator, Hyundai America Technical Center, Inc.

TO: Paul Jackson Rice -- Chief Council, NHTSA

TITLE: Re FMVSS Number 108, Lamps, Reflective Devices, and Associated Equipment

ATTACHMT: Attached to letter dated 3-14-91 from Paul Jackson Rice to Delbert N. Pier (A37; Std. 108)

TEXT:

Hyundai requests assistance with an interpretation regarding Federal Motor Vehicle Safety Standard, Number 108 (lamps, reflective devices, and associated equipment).

In regards to the interchangeability of headlamp bulbs, the procedure (571.108) requires that the terminals must be perpendicular to the base and parallel within plus or minus 1.5 degrees.

Hyundai would like an interpretation on whether the bulb fixture can be rotated approximately 11 degrees, as shown in the attachment, view X. This will not change the terminal logistics by the rotation of the bulb fixture. This rotation will not change the constants, (attachment, view Y, from 49 CFR) or the relationship of the terminals to the constants.

Hyundai is requesting an interpretation for a future production vehicle and needs a prompt answer. Thank you for your assistance in this matter. Should further clarification be required, feel free to contact me at the telephone number listed above.

Attachment 1

S571.108 49 CFR Ch. V (10-1-89) Interchangeability Drawing Headlamp Bulb Assembly (Text and graphics omitted)

ID: nht91-3.2

Open

DATE: March 28, 1991

FROM: Takeo Wakamatsu -- Executive Vice President, General Manager, Mitsubishi Motors America, Inc.

TO: Scott Shadle -- Supervisor, Vehicle Certification, NHTSA

TITLE: Re Derating of Trucks

ATTACHMT: Attached to letter dated 4-29-91 from Paul Jackson Rice to Takeo Wakamatsu (A37; Part 567)

TEXT:

Mitsubishi Fuso Truck of America, Inc. (MFTA), is the importer and distributor of trucks as incomplete vehicles manufactured by Mitsubishi Motors Corporation (MMC) in Japan. MMC Japan has asked Mitsubishi Motors America, Inc. (MMA), the liaison between MFTA and MMC Japan, to make the following request on their behalf.

MMC is considering derating the GVW of the trucks imported for the purpose of marketing strategy.

In this case, the brake system will not be modified and the vehicle should be in compliance with FMVSS 105 requirements. MMC would supply the new VIN plates with the derated GVW and have MFTA replace the old ones with the new ones.

We expect this kind of modification is such an implementation that has to meet with official approval. At this time, we are asking you for your approval of this modification.

If there are any additional questions you have regarding the above, please do not hesitate to contact me at (609)467-4664.

Your anticipated cooperation in this matter is greatly appreciated.

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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