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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 12301 - 12310 of 16506
Interpretations Date
 

ID: nht74-3.38

Open

DATE: 05/09/74

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

TO: Alfa Romeo, Inc.

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of April 5, 1974 to Mr. Schneider. You state that you are unable to obtain the ASTM E-249 test tire (4 ply rayon) referenced in the ASTM Method used to determine skid numbers, and you ask whether you may use the ASTM E-501 test tire (belted bias).

Your obligation as a manufacturer is to insure that your certification of compliance is not false and misleading in a material respect, and that you exercise due care in manufacturing to conform to the federal motor vehicle safety standards. A manufacturer is not required to follow specifically the test procedures of the standards, but to ascertain that his product will conform to the standard's requirements when it is tested by these procedures. In determining (Illegible Word) number, therefore, you are not required as a matter of (Illegible Word) to use the ASTM E-249 tire if you can reach the required result with equivalent procedures.

We understand that the original E-501 tire provided a slightly higher reading on dry pavement than the E-249 tire and that it is being redesigned so that the two tires give equivalent readings. We anticipate that, when the tire has been approved by ASTM for use in determining and number pursuant to ASTM Method E-274, we will propose a corresponding amendment to our definition of skid number, presently used in 49 CFR @@ 571.105-75, 571.121, 571.122, and 575.2.

ID: nht74-3.39

Open

DATE: 05/06/74

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Rozner and Yorty

TITLE: FMVSS INTERPRETATION

TEXT: This responds to your March 26, 1974, request for information on seat belt regulations as they concern reclining passenger seats.

Federal Motor Vehicle Safety Standard No. 208, Occupant Crash Protection, requires passenger cars to be equipped with seat belt assemblies, but it does not contain performance requirements to regulate the effectiveness of the belt assembly with the seating system in the reclining position.

Federal Motor Vehicle Safety Standard No. 207, Seating Systems, specifies minimum safety requirements for motor vehicle seats. The requirements of the standard are based on conventional seat designs that normally incorporate a seat back angle of approximately 25 degrees rearward inclination from the vertical. Standard No. 207 requires that reclining seats be tested in their most upright position and does not require seats to be tested in the reclining position.

The National Traffic and Motor Vehicle Safety Act of 1966 preempts state motor vehicle safety regulations which are not identical to the Federal standards with regard to the same aspect of performance and therefore any state law would be identical to Standards Nos. 207 and 208 on these aspects of performance (15 U.S.C. @ 1392 (d)).

The engineering staff is not aware of any studies in the area of seat belts and reclining seats.

Yours truly,

ROZNER AND YORTY

March 26, 1974

National Highway Traffic Safety Admin.

Re: Three point restraint on reclining passenger seat

Gentlemen:

I represent a passenger who was injured while she was sleeping in a bed-like reclining passenger seat. She slid out the back. She had a conventional seat belt on, but it did not help.

Are there any regulations either in the past or the future that would apply to this situation, either State or Federal? Have there been any studies on this subject or any interest in this subject. I shall appreciate whatever help you can give me.

Very truly yours,

William A. Goichman

ID: nht74-3.4

Open

DATE: 08/05/74

FROM: RICHARD B. DYSON -- NHTSA ACTING CHIEF COUNSEL

TO: JACK R. GILSTRAP -- GENERAL MANAGER SOUTHERN CALIFORNIA RAPID TRANSIT DISTRICT

TITLE: N40-30 [ZTV]

ATTACHMT: LETTER DATED 07/17/74 FROM JACK R. GILSTRAP TO RICHARD B. DYSON-NHTSA, RE FEDERAL MOTOR VEHICLE SAFETY STANDARD 108; LETTER DATED 12/26/73 FROM WARREN M. HEATH TO JACK R. GILSTRAP

TEXT: Dear Mr. Gilstrap:

This is in reply to your letter of July 17, 1974, asking whether S4.6 of Standard No. 108 prohibits a bus manufacturer from installing wining that could later be connected by the purchaser to normally steady-burning clearance lamps, enabling them to be flashed to signal a crime in progress. The vehicle modifications here concerned are the installation both of certain wiring by General Motors and dual filament bulbs in each clearance lamp by the Southern California Rapid Transit District.

Paragraph S4.6 requires that signalling lamps specified in Standard No. 108 shall flash when activated, and that "all other lamps" shall be steady-burning. Paragraph S4.1.3 in part prohibits the installation of motor vehicle equipment that impairs the effectiveness of the lighting equipment required by Standard No. 108.

We construe the phrase" all other lamps" in S4.6(b) to mean lamps that are required by Standard No. 108. Supplemental lamps on ambulances and police cars, for example, that flash in normal use are not included in the standard. Similarly , it would appear that when the clearance lamp you discuss is operated as a warning lamp it becomes an item of lighting equipment outside the coverage of Standard No. 108. Therefore the fact that it flashes when activated would not violate the intent

2 of S4.6(b). Similarly, the wiring that is installed by GM is not considered additional equipment that impairs the effectiveness of the required equipment.

The modifications you described, therefore, are not prohibited by Standard 108.

Yours truly,

ID: nht74-3.40

Open

DATE: 05/09/74

FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA

TO: Open Road Industries Inc.

TITLE: FMVSR INTERPRETATION

TEXT: This is in reply to your letter of March 21, 1974, regarding Open Road's defect notification letter in NHTSA campaign #73-0043. We indicated to you by letter of March 21, 1974, that notification letters in future campaigns must be modified to conform to @ 577.4(e)(3) of the Defect Notification regulations (49 CFR Part 577) if you continue to make repairs contingent upon the purchaser's agreement to the indemnity and hold-harmless provision found in Open Road's "Authorization for Repair and Alteration" form. You state in your letter that the sole purpose of the indemnity and hold-harmless provision is to protect your company from claims from third parties for unauthorized repairs.

While it is true, as you point out, that the indemnity and hold-harmless provision is not part of the notification letter, that fact is not germane to our conclusion that your letter must conform to @ 577.4(e)(3) if you continue only to make repairs contingent upon the owner's agreement to the provision in question. We are pleased to know that the provision's sole purpose is to protect the company against claims from unknown owners for unauthorized repairs, and we do not object to repairs being contingent upon the owner's agreement to such a provision. But if that is the case we would insist that the provision be more narrowly drafted so that its intent is clear. If that is done Open Road may continue to send notification letters that conform to @ 577.4(e)(1). The responses we have had from owners of Open Road vehicles subject to defect notification and our own review of the provision are persuasive in our view that at present this limited intent is not clear.

Notwithstanding your reference to the meeting Open Road officials had with Robert Carter and Andrew Detrick of NHTSA, at no time was approval given to Open Road's notification letter with knowledge that repair would be made only following the owner's agreement to the indemnity and hold-harmless provision.

ID: nht74-3.41

Open

DATE: 05/09/74

FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA

TO: Andrew T. Hosoodor

TITLE: FMVSR INTERPRETATION

TEXT: This is in reply to your letter of March 26, 1974, concerning the defect notification campaign involving your 1972 Open Road motor home. You object to Open Road's insistence that you sign an authorization for repair and alteration form which contains a rather comprehensive indemnity and hold-harmless provision.

The NHTSA is without authority to compel the making of any repairs to potentially defective vehicles in the hands of purchasers. Manufacturers are free to make repairs subject to conditions, or to not make them at all. The NHTSA has issued regulations regarding the content of defect notification letters (49 CFR Part 577) but does not consider these regulations to apply to the campaign in question as the campaign was initiated before the regulations become effective.

We have corresponded with Open Road regarding this matter, which was first brought to our attention by another purchaser whose objections were similar to your own. That purchaser signed a modified authorization form with Open Road, who has provided us with a copy which we enclose for your information. Open Road has informed us that the sole purpose of the indemnity and hold-harmless clause to which you object is to protect Open Road from third party claims for unauthorized repairs. A copy of Open Road's letter to use with that representation is enclosed should you wish to undertake further negotiations with the company.

We have notified Open Road that future campaign notification letters must be revised if the company insists on the continued use of the indemnity and hold-harmless provision in its present form. Copies of this correspondence with Open Road are also enclosed.

We appreciate your bringing this matter to our attention.

ENC.

ID: nht74-3.42

Open

DATE: 05/14/74

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

TO: Dave's Tire & Fuel Oil Corp.

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letters of March 21 and April 22, 1974, in which you ask whether a tire sold as a "blemish" must be guaranteed for workmanship, material, and road hazards.

There are no Federal requirements that manufacturers guarantee blemish (or non-blemish) tires. Such guarantees are within the discretion of each manufacturer. However, Federal Motor Vehicle Safety Standard No. 109 (49 CFR @ 571.109) requires all new passenger car tires to meet minimum safety performance levels for high speed performance, endurance, strength, bead unseating, physical dimensions and tradewear indicators. These requirements apply similarly to both blemish and non-blemish tires.

We have enclosed for your information a copy of the Federal Trade Commission's Tire Advertising and Labeling Guides which contain in Guide 11 requirements for the labeling of blemish tires.

ENC.

ID: nht74-3.43

Open

DATE: 05/10/74

FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA

TO: City of Philadelphia

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of March 5, 1974, inquiring whether manufacturers of 4-door sedans to be sold to the City of Philadelphia at police vehicles may, consistently with Federal requirements, remove the window and door handles from the rear doors. You state that the vehicle manufacturers claim that Federal requirements prohibit them from modifying the vehicle in this fashion.

Federal Motor Vehicle Safety Standard No. 206 (49 CFR 571.206) requires each passenger car rear door to have a locking mechanism that is operable from within the vehicle and that, when engaged, renders the outside an inside door handles inoperative. This requirement applies to the locking mechanism. We do not interpret it to require an inside door handle. There are no Federal standards which require the installation of passenger car window handles.

The fact that in this case the vehicles are intended for government use is immaterial. To clarify the phone conversation which preceded your letter, Section 103(d) of the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1392(d)) allows a State or its political Subdivision to require that motor vehicles and motor vehicle equipment procured for its own use meet a higher standard of preformance than the Federal safety standard, but all vehicles must meet the Federal safety standards.

We are pleased to be of assistance.

SINCERELY,

CITY OF PHILADELPHIA

March 5, 1974

Lawrence Scheider Chief, National Highway Traffic Safety Administration

The City of Philadelphia is in the process of purchasing 1,000 four-door passenger Sedans to be used as police vehicles. We have requested the bidding manufacturers to remove the window and door handles from the rear doors of the vehicles. We have been told by the manufacturers that there is a federal regulation which prohibits this modification.

On March 1, 1974, I spoke via telephone with Mr. Stanley Feldman, Esquire, from your office regarding this matter. It was Mr. Feldman's opinion that modifications which are normally adhered to by federal regulations may be changed to suit our particular needs since the City of Philadelphia is a political sub-division of the Commonwealth of Pennsylvania.

I would appreciate receiving your written verification on Mr. Feldman's opinion prior to any further negotiations with the vehicle manufacturers.

Please send your response to the undersigned, City of Philadelphia, 1600 Municipal Services Building, Philadelphia, PA 19107.

CHARLES W. MURPHY

Safety Director

ID: nht74-3.44

Open

DATE: 05/14/74

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Oshkosh Truck Corporation

TITLE: FMVSR INTERPRETATION

TEXT: This is in reply to your letter of March 27, 1974, in which you ask whether a final-stage manufacturer who mounts a used body on a new chassis is required to certify the conformity of the completed vehicle in accordance with 49 CFR Parts 567, 568.

The answer is yes. A person who mounts a used body on a new chassis is a final-stage manufacturer and is required to certify the conformity of the completed vehicle. The NHTSA has interpreted the Certification requirement as applying to any complete vehicle manufactured using a new incomplete vehicle (chassis) whether or not the body to be installed is new or used.

ID: nht74-3.45

Open

DATE: 05/21/74

FROM: AUTHOR UNAVAILABLE; SIGNATURE UNAVAILABLE; NHTSA

TO: Peter Dakin

TITLE: FMVSR INTERPRETATION

TEXT: This is in response to your letter of May 4, 1974, requesting information concerning Federal safety standards applicable to the assembly of kit cars.

The National Traffic and Motor Vehicle Safety Act of 1966 prohibits the manufacture for sale or introduction into interstate commerce of any motor vehicle that does not comply with all applicable Federal motor vehicle safety standards. Therefore, if the vehicle you are building is going to be used as a means of transportation on the road, it must be certified as conforming with all applicable safety standards. The mere use of a vehicle on public highways constitutes an introduction into interstate commerce and is prohibited unless compliance with the safety standards has been achieved.

Part 56/.4(g) (1)(ii) of the certification regulations provides the producer of the kit with an option as to whether or not he certifies that the vehicle will comply with all applicable safety standards if completed according to his instructions. We would urge you to avoid undertaking the assembly of a kit that does not give assurance as to its ultimate ability to comply. If the producer of the kit takes the responsibility of certifying the completed vehicle, you as the assembler of the vehicle must exercise reasonable care in following the instructions he provides.

For your information I have enclosed a sheet entitled "Where to Obtain Motor Vehicle Safety Standards and Regulations" which will direct you to the proper source for obtaining a copy of the safety standards and regulations.

ENC.

May 4, 1977

Peter Dakin

733 Spartan Drive

Rochester

Michigan 48063

Department of Transportation Washington DC

Dear Sir or Madam

please advise me what regulations I must obey in building a kit car for legal street use and registration?

Thank you.

Yours sincerely

Peter Dakin

ID: nht74-3.46

Open

DATE: 05/22/74

FROM: AUTHOR UNAVAILABLE; A.G. Detrick; NHTSA

TO: Porsche/Audi

TITLE: FMVSR INTERPRETATION

TEXT: This is in reference to your defect notification campaign (NHTSA No. 73-0229) concerning possible fires resulting from a short in the radiator cooling fan in some Audi 100's.

The letter which you have sent to the owners of the involved vehicles does not entirely meet the requirements of 49 CFR Part 577. Specifically, the phrase, "possible hazard that may exist in your vehicle," may be construed as a disclaimer since it tends to discourage vehicle owners from having their vehicles corrected and is therefore not permitted. It is, however, permissible to state that the defect may not be present in every vehicle being campaigned if such a statement is applicable.

It will not be necessary to send an additional letter in this instance, but all future defect notifications must comply with the applicable regulation. If you desire further information, please contact Messrs. W. J. Reinhart or James Murray at this office (202) 426-2840.

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.