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
| Interpretations | Date |
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ID: 1984-2.13OpenTYPE: INTERPRETATION-NHTSA DATE: 07/01/84 EST. FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA TO: Blue Bird Body Company -- Thomas D. Turner, Engineering Services TITLE: FMVSS INTERPRETATION TEXT:
Thomas D. Turner Engineering Services Blue Bird Body Company P.O. Box 937 AC-912/825-2O21 Fort Valley, Georgia 31030 This responds to your letter dated March 27, 1984 regarding Federal Motor Vehicle Safety Standard No. 107 Reflecting Surfaces in which you ask for an interpretation of the term "bright metal components." You asked whether these components would include only polished metal or plated components and not painted metal components, even if painted "a shiny high gloss black." In addition, you asked whether a plastic component would be covered by the standard. The purpose of Standard No. 107 is to reduce the likelihood that unacceptable glare from reflecting surfaces in the driver's field of view will hinder safe and normal operation of the motor vehicle. The standard sets limits on the "specular gloss of the surface of the materials" used for certain "bright metal components." The standard was based on materials commonly used in vehicle at the time of the standard issuance and thus it referred to metal components. Since the requirements apply to the surfaces of those metal components, a metal interior rearview mirror frame with a painted "shiny high glass" surface would be covered by the standard. An all-plastic component would be outside the literal requirements of the standard. But since a plastic component could produce an unacceptable glare if located in the driver's field of view, the agency urges manufacturers to use plastic materials which will not produce glare.
Sincerely,
Frank Berndt Chief Counsel
March 27, 1984
Mr. Frank Berndt Chief Counsel National Highway Traffic Safety Administration 400 7th Street. S.W. Washington, D.C. 20590
Dear Mr. Berndt:
I am writing you to reference to Motor Vehicle Safety Standard Number 107-Reflecting Surfaces. The standard specifies the specular gloss of the surface of the materials used for specified " . . . bright metal components in the driver's field of view . . polished metal or plated components and not to painted components. Thus, an inside rearview mirror frame and bracket, for example, painted black would not be subject to the requirements of the standard even if it were painted a shiny high gloss black. Likewise, a plastic component would not be subject to the standards requirements unless it was bright metal plated such as being chrome plated. We request your confirmation of our interpretation and thank you in advance for your prompt reply.
Very truly yours,
Thomas D. Turner Manager, Engineering Services fvc c: David James FMVSS 107 File |
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ID: nht93-7.6OpenDATE: October 1, 1993 Est. FROM: Larry Grabsky -- VML and Colonna Corp. TO: John Wilman -- Acting Chief Counsel, NHTSA TITLE: None ATTACHMT: Attached to letter dated 11/16/93 from John Womack to Larry Grabsky (A41; Std. 108) TEXT: Regarding a phone conversation with a member of your staff recently we would appreciate any relevant information pertaining to the following: Has your agency issued any recent and/or relevant advisory opinion regarding decorative neon lights or the use of oscillating or revolving lights even if they do not diminish the effect or performance of required lighting on a motor vehicle and does such violate FMVSS Section 108. Once again, we do appreciate your forwarding us information and your agencies assistance in this matter. |
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ID: nht93-8.11OpenDATE: November 15, 1993 FROM: Amar Chhabra -- Project Manager, Procedair Industries TO: To Whom It May Concern TITLE: None ATTACHMT: Attached to letter dated January 26, 1994 from John Womack to Ramin Bogzaran (A42; VSA 102(3)); Also attached to letter dated 12/1/93 from Ramin Bogzaran to John Womack; Also attached to fax dated 12/15/93 from Ramin Bogzaran to Marvin Shaw; Also attached to letter dated 11/30/93 from Lynn White to Jeff Boraston TEXT: This letter is to certify that the equipment stored at CES 401 Slater Street, New Westminister, BC V3H 3Y1 was fabricated by IMF INC. located in Greenville, Tennessee, USA. The above mentioned equipment mainly consists of two (2) trailers complete with Air Pollution Control equipment and accessories. |
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ID: nht75-5.23OpenDATE: 08/27/75 FROM: AUTHOR UNAVAILABLE; Allan Kam; NHTSA TO: Memorandum to interpretations file TITLE: FMVSR INTERPRETATION TEXT: SUBJECT: TELEPHONE CALL FROM YOKOHAMA TIRE CO. REPRESENTATIVE -- AUGUST 21, 1975 I received a call at 5 p.m. on August 21, 1975, from Mr. N. Harada, a representative of Yokohama Tire Corporation, with regard to the effective dates of the U.T.Q.G.S. Rule. I explained to him that six manufacturers who are litigating the validity of the Rule had brought a motion to stay the enforcement and postpone the effective dates of the Rule, and that on August 14, 1975, the Court granted the motion to stay. He asked when the Rule would become effective; I responded that I could not say when, because the matter was in litigation and that I did not want to speculate about the Court's judgment. I further explained that the only effective dates which the agency had set were those in the Rule, e.g., January 1, 1976, for radial tires, but that the Court last week issued a stay. He asked whether, in the event that the validity of the Rule was upheld by the Court, new, later effective dates would be established; I responded that any answer I could now give to that question would be speculation and that the agency has set no other effective dates. Mr. Harada also asked when the Court would decide the validity of the Rule. I told him that this was under the control of the Court, not the agency. He was under the mistaken impression that the Court was or is going to rule on the effective dates or some related matter this week. I explained that the only operative "event" that I am aware of which would occur this week is the filing of the Petitioners' brief on the merits, which was due to be filed by last Monday, August 18, and which we have not yet actually received. Subsequently, I continued, the Government would file its brief on the merits, and then the Petitioners would have an opportunity to file a reply brief and the case would then be set down for oral argument. After oral argument, which would not take place before October and might be in December or later, depending upon when the Court scheduled it, the Court would deliberate and then issue its ruling. I explained that the agency had no control over how long the Court deliberates or when the Court would issue its ruling. I tried to give the above answers and explanations slowly and clearly, because there appeared to be a language barrier; the caller was courteous, but English was obviously a second language to him, and it seemed that he may have been somewhat confused. The next day, August 22, Mr. Harada again phoned in the late afternoon and stated that, in reference to his previous call, the subject matter was "very important" and he would therefore like to have it in writing. At his request, I told him that I would send him a letter. |
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ID: nht76-3.24OpenDATE: 02/27/76 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Northern Coach Inc. TITLE: FMVSR INTERPRETATION TEXT: I am writing to confirm your telephone conversation of February 25, 1976, with Mark Schwimmer of this office, concerning the certification of school buses. As Mr. Schwimmer explained, this agency does not certify or otherwise issue advance approvals of motor vehicles or motor vehicle equipment. Certification, under the applicable law and regulations, must be done by the vehicle manufacturer, including a final-stage manufacturer such as you. Your certification obligation, as a final stage manufacturer of school buses, is met if you fulfill the requirements of 49 CFR Part 567, with which I understand you are already familiar. An information sheet entitled "Where to Obtain Federal Motor Vehicle Safety Standards and Regulations" is enclosed for your convenience. Please write if we can be of any further assistance. |
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ID: nht91-2.5OpenDATE: February 28, 1991 FROM: Z. Taylor Vinson -- Senior Staff Attorney, NHTSA TO: Files: Interps. Std. 108; Redbook (3) TITLE: Re Interpretation Letter to Oshkosh TEXT: On February 14, 1991, John Calow, Senior Safety Engineer, Oshkosh Truck Corp. (414-255-9151 ext. 2038) telephoned me about the agency's letter of January 16, 1991, with respect to override of the stop signal by the turn signal. Our letter assumed that turn signals and hazard warning signals (which operate through the turn signal lamps) have a common circuit, and implied that the hazard signals must also override the stop signals when stop signals are optically combined with turn signals. Mr. Calow asked whether the override would be required if the hazard signal were on a separate circuit. I informed him that the override would not be required because the SAE requirement relates only to turn signal lamps. |
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ID: 1982-2.30OpenDATE: 08/02/82 FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA TO: Roberts Motor Company TITLE: FMVSS INTERPRETATION TEXT: This is in reply to your letter of July 16, 1982, asking for an interpretation of Motor Vehicle Safety Standard No. 108. You enclose photos of a 1982 Kenworth truck which has two pairs of front turn signal lamps: one set (incorporating a side reflector) mounted 58 1/2 inches above the road surface and which are 83 inches apart; the other, mounted approximately 81 1/2 inches above the road surface and which are 110 inches apart. You have asked whether the vehicle would comply if the lower mounted set were removed and an amber reflex reflector placed on each side of the fender as far forward as practicable. The answer is yes. The mounting height of 81 1/2 inches does not exceed the limit of 83 inches imposed by Table II of Standard No. 108. In addition, the lamps appear to meet the two further requirements that they be located as far apart as practicable and at the same height. Sincerely, ATTACH. July 16, 1982 Administrator -- National Highway Traffic Safety Administration, Department of Transportation Subject: Federal Motor Vehicle Safety Standard Number 108 Lamps, Reflective Devices and Associated Equipment Gentlemen: Enclosed please find two photographs of a 1982 Kenworth, Model W900. You will note from the photographs that two sets of turn signals are on the vehicle, one set on the hood and another set on the bottom of the mirror brackets. On the vehicle shown, which is typical of the Model, the center of the fender mounted signals are approximately 58 1/2" above the road surface and approximately 83" apart. The center of the mirror mounted turn signals are approximately 81 1/2" above the road surface and approximately 110" apart. Our question concerns Federal Motor Vehicle Safety Standard Number 108(571.108), specifically, Table II, "Location of Required Equipment", "Turn Signal Lamps". Considering the dimensions above, would the vehicle be in conformance with the Standard if only the mirror mounted turn signals were installed on the vehicle and an amber reflex reflector placed on each side of the fender as far forward as practicable? We would appreciate your consideration and reply to this matter at your earliest opportunity. Yours truly, Ronald E. DeVolder -- Vice President enclosures (Graphics omitted) |
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ID: 1982-3.11OpenTYPE: INTERPRETATION-NHTSA DATE: 10/21/82 FROM: AUTHOR UNAVAILABLE; S. R. Scheiner; NHTSA TO: Kioto Manufacturing Co., Ltd. TITLE: FMVSS INTERPRETATION TEXT:
October 21, 1982
AIR MAIL
M. Iwase, Manager Technical Administration Department Koito Manufacturing Co., Ltd. Shizuoka Works 500 Kitawaki Shimizu-Shi, Shizuoka-Ken JAPAN
Dear Mr. Iwase:
This is in reply to your letter of September 8, 1982, regarding signal flashing on an auxiliary lamp. You asked several questions on your proposed auxiliary lamp which would be installed as original equipment to supplement the lower beam headlamp:
1. Whether this auxiliary lamp would be legally accepted to be flashed for a passing signaling purpose.
2. In case that this auxiliary lamp is designed to comply with the requirements of SAE J583d - Fog Lamps, instead of SAE J582a -Auxiliary Low Beam Lamp: Whether the auxiliary lamp (Fog Lamp) could be legally accepted to be flashed for a passing signal purpose. The answer to these questions is: No.
Paragraph S4.6 of Federal Motor Vehicle Safety Standard (FMVSS) No. 108, Lamps, Reflective Devices, and Associated Equipment allows turn signal and hazard warning signal lamps to flash but subparagraph (b) states:
"All other lamps shall be steady-burning, except that means may be provided to flash headlamps and side marker lamps for signaling purposes."
We interpret "all other lamps" to include all lamps, required and auxiliary lighting such as the lamp you propose.
In summary we interpret FMVSS No. 108 not to allow the auxiliary lamp you propose to be used as a flashing lamp.
Sincerely,
Stanley R. Scheiner, Acting Chief Crash Avoidance Division Office of Vehicle Safety Standards
NHTSA:OVSS:CAD:Medlin:orb:9/27/82:(JWASE) REWRITTEN:Medlin:orb:9/30/82 RETYPED:orb:10/7/82: REW:Vinson:nbb 10/18/82 Copies to: NRM-01 Chron NRM-11 Chron/Subject/Medlin's File/Hold;NOA-30 Interps;NOA-30 Redbook(3)
No Control |
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ID: nht73-5.26OpenDATE: 10/11/73 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Robertson Tank Lines, Inc. TITLE: FMVSS INTERPRETATION TEXT: This is in reply to your letter of August 30, 1973, requesting a DOT code number for retreaded tires you manufacture. It appears from your letter that the tires you retread are truck tires intended solely for your company's own use. Any tires retreaded by and solely for use by Robertson Tank Lines are exempt from NHTSA recordkeeping requirements and a code number is not required. As truck retreads are not subject to any Federal motor vehicle safety standard, you are also not required to place a "DOT" symbol on them. If you retread passenger car tires, however, you are required to place a "DOT" symbol on the tire sidewall (indicating conformity to Federal Motor Vehicle Safety Standard No. 117). ROBERTSON TANK LINES INC. August 30, 1973 Tire Identification and Recordkeeping Dept. National Highway Traffic Safety Administration Dear Sir: The attached form is our request for a tire retread D.O.T. number. Tires produced in our shop will be for our fleet use, with no resale of our tires or services. Our main office address is: Robertson Tank Lines, Inc. P.O. Box 1505 Houston, Texas 77002 Retread shop address: Robertson Tank Lines, Inc. Maintenance Terminal 2401 Battleground Rd. Deer Park, Texas 77536 Thank you for your consideration in handling this matter. Best Regards, Donald Gary Hayes cc: Bob Partain Date: August 29, 1973 Tire Identification and Recordkeeping National Highway Traffic Safety Administration 400 Seventh Street, S.W. Washington, D.C. 20590 Gentlemen: I hereby apply for a Retread Tire Identification Code Mark as a manufacturer of retread tires. The following information is offered: Retread Plant Name:(Illegible Words) Street:(Illegible Words) City & State: DEERPARK(Illegible Word) Zip Code: 77536 Telephone No. 479-3451 EXT 52 Main Office Name:(Illegible Words) Street:(Illegible Words) City & State: Houston, Texas Zip Code:(Illegible Word) Telephone No: 623-0000 Types of Tires Retreaded Truck: Applicants Signature:(Illegible Words) |
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ID: 2662yOpen Mr. Gerald F. Vinci Dear Mr. Vinci: This responds to your August 14, 1990 letter and telephone calls about your plans to convert the fuel system on a vehicle from gasoline to propane. You said your company ("Sun Refining") would like to purchase a new vehicle and convert it for purposes of your own research, and will not be reselling the vehicle. You ask about the requirements that would apply to the conversion. We do not have any requirements that would apply to the conversion if the conversion is made by Sun itself. The National Traffic and Motor Vehicle Safety Act and NHTSA's regulations generally do not apply to a vehicle after the vehicle is sold to a consumer (e.g., Sun) for purposes other than resale. Although the Act prohibits certain entities from tampering with or removing federally required safety features, the prohibition does not apply to modifications by a vehicle owner to his or her own vehicle. However, in the event you have the conversion done by a party other than your company, Federal law may apply. Section 108(a)(2)(A) of the Safety Act prohibits vehicle manufacturers, distributors, dealers and repair businesses from knowingly rendering inoperative federally required safety features when modifying a vehicle. I have enclosed an information sheet that discusses the application of 108(a)(2)(A) to fuel system conversions. NHTSA wishes to learn more about the safety of propane fuel systems and is considering a public announcement seeking information on various safety issues. We would, therefore, be interested in the results of your research when they're completed. Even though your conversion would not be covered by the FMVSS's, we suggest you consult State law to see if the State has requirements for propane vehicles. In addition, other Federal agencies may have regulations for your vehicle. If your vehicle would be a commercial vehicle, the regulations of the Federal Highway Administration (FHWA) may apply. I have forwarded a copy of your letter to FHWA for their reply. You might also contact the Environmental Protection Agency (EPA) for information about the conversion. EPA's general telephone number is (202) 382-2090. I hope this information is helpful. Please contact us if you have further questions. Sincerely,
Paul Jackson Rice Chief Counsel Enclosure /ref:301#VSA d:9/l7/90 |
1970 |
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.