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: nht76-1.33OpenDATE: 04/07/76 FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA TO: Trans-Continental Tire Sales, Inc. TITLE: FMVSS INTERPRETATION TEXT: I am writing to confirm your March 19, 1976, telephone conversation with Mark Schwimmer of this office concerning Federal Motor Vehicle Safety Standard No. 119, New Pneumatic Tires for Vehicles Other than Passenger Cars. Standard No. 119 requires that the symbol "DOT" appear on the sidewall of a non-passenger car tire, as a certification that the tire meets all of the standard's performance and labeling requirements. Assuming that the tire in question does meet those requirements and is so certified, there is no prohibition in the standard against additional labeling such as "Blem" or "A.B.O." I hope this clarifies the status of your tires. Sincerely, ATTACH. March 9, 1976 Frank Berndt -- Acting Chief Counsel, N.H.T.S.A. Dept. of Transportation Re: Federal Motor Vehicle Safety Standards Sec. 119. Dear Mr. Berndt, Can you clarify that truck tires marked "A.B.O." or "Blem" are safe for highway use on the front end of commercial over the road vehicles? The tires in question do meet D.O.T. highway specifications for manufacturers safety, in so for as they are free from defects in workmanship and materials. Please rush clarification as soon as possible. Thank You. Respectfully Yours, Raymond Oleisky, Operations Manager |
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ID: 2860oOpen Mr. Robert Cuzzi Dear Mr. Cuzzi: This responds to your letter asking whether buses with a gross vehicle weight rating (GVWR) greater than 10,000 pounds are excluded from coverage under Federal Motor Vehicle Safety Standard No.301, Fuel System Integrity. I regret the delay in responding to your letter. The answer to your question is yes. Safety Standard No. 301 applies to new passenger cars, multipurpose passenger vehicles, trucks, and buses having a GVWR of 10,000 pounds or less and to all new school buses. The buses you manufacture for sale as municipal transit buses are excluded from Standard No. 301 because their GVWR is greater than the 10,000 pound limit established for the standard. You asked also whether there are any other Federal standards that might apply to the fuel tanks on your transit buses. I have forwarded a copy of your letter to the Federal Highway Administration (FHWA) and the Urban Mass Transit Administration (UMTA) for their direct reply as to the applicability of any FHWA or UMTA regulations to your transit vehicles. You might also contact the Environmental Protection Agency (EPA) to see whether that agency has any requirements affecting the fuel tanks on your buses. The general telephone number for the EPA is (202) 382-2090. Sincerely,
Erika Z. Jones Chief Counsel ref:301 d:6/17/88 |
1988 |
ID: nht75-5.6OpenDATE: 12/24/75 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Conti Rubber Products TITLE: FMVSR INTERPRETATION TEXT: This is in response to your October 29, 1975, letter concerning the applicability of Federal Motor Vehicle Safety Standard No. 119, New Pneumatic Tires for Vehicles other than Passenger Cars, to moped tires. Mopeds are classified under 49 CFR 571.3 as "motor-driven cycles", a subcategory of "motorcycles", for the purposes of the National Highway Traffic Safety Administration's regulations. Therefore, tires designed for use on mopeds are tires designed for use on motorcycles and, as such, are subject to Standard No. 119. The NHTSA is considering an amendment of Standard No. 119 which would modify the requirements applicable to such tires, and expects to issue a notice of proposed rulemaking on this subject in the near future. Yours truly, ATTACH. Conti RUBBER PRODUCTS INC. October 29, 1975 Frank Berudt -- Acting Chief Council, National Highway Traffic Safety Administration Dear Mr. Berudt: We would appreciate receiving a ruling whether MOPED tires in the sizes 2-17 and 2 1/4-17 fall under MVSS119. A MOPED is a motorized bicycle with a maximum speed of 30 miles per hour. We would appreciate your fastest possible reply. Very truly yours, George H. Schildge -- Exec. Vice President |
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ID: nht94-4.66OpenTYPE: INTERPRETATION-NHTSA DATE: October 27, 1994 FROM: Lois Castillo -- President, Travel Tray, Inc. TO: Joan Womack -- NHTSA; John Womack TITLE: NONE ATTACHMT: Attached to 1/9/95 letter from Philip Recht to Lois Castillo (A43; Std. 213) TEXT: Dear Joan Womack: My name is Lois Castillo. I represent a new company called Travel Tray, Inc. based in Utah. Our tray fits across children's carseats and is easily attached and removed. I have enclosed one of our brochures that describes our tray. I need your help in obtaining any information you might have regarding safety regulations pertaining to a tray such as this. We are in preparation to start manufacturing and have been advised to seek information from your department first. I have spoken with Craig Allred, Director of the State of Utah Division of Highway Safety and showed him my tray. He felt the tray was okay, but suggested that I should apply a disclaimer clause and warning that the tray should not be used as part of the safety apparatus. That it is only to be used as a convenience item - like a toy - for the child. My patent attorney also suggested thi s. Please let me know what you think and any information you might have regarding this. Thank you in advance for your time. Enclosure (Brochure omitted.) |
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ID: nht88-2.48OpenTYPE: INTERPRETATION-NHTSA DATE: 06/10/88 FROM: T. BAILEY -- LEGISLATION ENGINEER, INTERNATIONAL AUTOMOTIVE DESIGN TO: NHTSA TITLE: FMVSS 104 Windshield WIPING & WASHING SYTEMS ATTACHMT: MEMO DATED 11-3-88, TO T.P. BAILEY, FROM ERIKA Z. JONES, STD. 104 TEXT: As an automotive design consultancy we need a clear understanding of this Standard, particularly the requirements of paragraph S4.1.2, Wiped Area. We have a problem with this and would appreciate some advice. Firstly, can you confirm this paragraph is only applicable to passenger cars. Secondly, the hypothetical results for a windscreen are shown on attachment 1. In this, Area A on one side extends to the DLO, on the other, overlaps it. (The DLO is taken to start at the inner edge of the obscuration band). As drawn, the correct perce ntage wiped area is still achieved. Should Area A be wholly:- 1. On exterior surface of glass, inside a perimeter line drawn one inch from edge of daylight opening. 2. On exterior surface of glass, inside the DLO. 3. On exterior surface of glass (ie. whole surface visible from outside vehicle including the obscuration band). 4. On total exterior surface of glass (ie. including the part normally hidden under trim and mouldings). Thank you for your attention. I look forward to hearing from you. See Illumtation on original |
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ID: bmw102-1.pjaOpenMr. Karl-Heinz Ziwica Dear Mr. Ziwica: This responds to your request for an interpretation of Standard No. 102, Transmission shift lever sequence, starter interlock, and transmission braking effect. Specifically, you ask whether a park control that is actuated by a separate control instead of by the movement of the transmission shift lever is part of the transmission shift lever sequence. You also ask whether such a park position must be located at the end, adjacent to reverse. Paragraph S3.1.1 of Standard No 102, Location of transmission shift lever positions on passenger cars, states, in part " . . . If the transmission shift lever sequence includes a park position, it shall be located at the end, adjacent to the reverse drive position." [emphasis added.] Paragraph S3.1.1 explicitly limits the requirement to those park positions included within the "shift lever sequence." It is our interpretation that if park is not selected by the movement of the shift lever, then the park control is not part of the shift lever sequence. In this case, the sentence quoted above does not apply, and the park control does not have to be located at the end, adjacent to reverse. I hope this information is helpful. If you have any questions, please contact Paul Atelsek of my staff at (202) 366-2992. Sincerely, |
1998 |
ID: aiam3185OpenMr. Jeffrey Libman, President, Edison Rubber Company, P. O. Box 254, Edison, New Jersey 08817; Mr. Jeffrey Libman President Edison Rubber Company P. O. Box 254 Edison New Jersey 08817; Dear Mr. Libman: This responds to your letter of November 9, 1979, inquiring if it i permissible for your suppliers to cut off the DOT serial numbers on used tires before selling those tires to your company. You stated in your letter that your company buys used tires from several companies. These tires generally either have cuts in the tread or sidewalls or are out of round. Your company then resells the tires to another company, which resells the tires to the public.; The answer to your question is no. The presence of the DO identification number on tires is required by several of this agency's regulation. Our tire identification and record keeping regulation (49 CFR Part 574) requires that each manufacturer place the DOT number on at least one sidewall of each tire that it manufactures. The number serves several purposes. It is indispensable in aiding consumers to identify tires subject to a recall campaign for safety defects and noncompliance with the safety standards. It also aids this agency in enforcing its tire safety standards. Federal Motor Vehicle Safety Standards 109 (Passenger car tries, 49 CFR 571.119) and 119 (Tires for vehicles other than passenger cars, 49 CFR 571.119) require that each tire manufacturer certify that its tires conform to all applicable Federal safety standards by branding or molding the DOT number on the tire.; Section 108(a)(2)(A) of the National Traffic and Motor Vehicle Safet Act of 1966, as amended (15 U.S.C. 1397(a)(2)(A)), states that, 'No manufacturer, distributor, dealer, or motor vehicle repair business shall knowingly render inoperative, in whole or in part, any device or element of design installed on... an item of motor vehicle equipment in compliance with an applicable federal motor vehicle safety standard ....' By removing the DOT identification number from a tire, the person would be knowingly rendering inoperative an element of design on the tires which is included on the tire for compliance with the requirements of a Federal motor vehicle safety standard. Section 109 of the Act (15 U.S.C. 1398) specifies a penalty of up to $1,000 for each violation of section 108.; Sincerely, Frank Berndt, Chief Counsel |
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ID: aiam1874OpenHonorable John Rhodes, House of Representatives, Washington, DC (sic); Honorable John Rhodes House of Representatives Washington DC (sic); Dear Mr. Rhodes: This is in response to your letter of March 17, 1975, requestin information concerning correspondence from one of your constituents, Mr. William R. Langer, commenting on a proposed amendment to the Federal Bumper Standard.; On January 2, 1975, the National Highway Traffic Safety Administratio (NHTSA) issued a Federal Register Notice (copy enclosed) proposing to reduce the current 5 mph bumper impact requirements to 2.5 mph until the 1970 (sic) model year. The impact requirements would have been increased to 4 mph for 1979 and later model year cars.; The proposal was based primarily on the results of two agency sponsored studies which indicated that the cost and weight of many current production bumpers, in light of inflation and fuel shortages, made the bumpers no longer cost beneficial. Information presented at public hearings on the bumper notice and comments submitted to the docket in response to the proposal have brought to light additional data. The NHTSA has carefully examined all of this evidence and reviewed its studies in light of the new information. As a result, the agency has concluded that the 5 mph protection level should not be reduced. This decision is contained in a Federal Register notice that was published March 12, 1975, which is enclosed (Docket No. 74-11, Notice 7, Docket No. 73-19, Notice 6).; Mr. Langer has directed his comments to what he believes to be proposed requirement that vehicles manufactured in the future be equipped with plastic bumper systems. Such an understanding of the proposal is incorrect. The January 2, 1975 proposal was aimed at enabling a reduction in vehicle weight. In the preamble to that notice, the NHTSA cited soft face bumpers as one type of system that could produce a significant weight reduction. However, no proposal was made to require the use of soft face (plastic) systems. The March 12, 1975 notice reiterates the agency's position that bumpers which are lighter in weight than those currently in mass production could and probably would be developed. The requirements proposed in the March notice, however, ensure that a wide variety of materials could continue to be used in bumper systems.; Sincerely, Robert L. Carter, Associate Administrator, Motor Vehicl Programs; |
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ID: aiam5071OpenMr. Christopher Leone NewBold Designs 765 Allens Avenue Providence, R.I. 02905; Mr. Christopher Leone NewBold Designs 765 Allens Avenue Providence R.I. 02905; "Dear Mr. Leone: This responds to your FAX of August 6, 1992, to Taylo Vinson of this Office, asking for rules and regulations of the Department on electric vehicles. I understand that you talked with Mr. Vinson later in the day, and received an overview of the matter. I further understand that you intend only the construction of a single experimental vehicle, and have no plans for its production. Under the National Traffic and Motor Vehicle Safety Act, the introduction into interstate commerce, by any person, of a motor vehicle that does not conform to all applicable Federal motor vehicle safety standards is a violation, for which a civil penalty of up to $1,000 may be imposed. The Federal motor vehicle safety standards are set out in Title 49 Code of Federal Regulations Part 571. There are no standards that apply specifically to electric vehicles, and the standards that apply to your project car are those that apply to 'passenger cars' in general. However, the manufacturer of an electric vehicle may petition us for a temporary exemption (up to 2 years) from one or more of the safety standards on the basis that the exemption would facilitate the development and field evaluation of a low-emission motor vehicle. The temporary exemption regulations are found at 49 CFR Part 555. An exemption covers up to 2,500 vehicles per year for any 12-month period that the exemption is in effect. Regulations governing the licensing of motor vehicles are the prerogative of the individual States. Thus, you should inquire as to what Rhode Island requires for your contemplated vehicle. There is a regulatory gap which your situation highlights, and that is the legal status of a person who intends to build only a single motor vehicle. Such a person is not a 'manufacturer' under the Act, since the operative portion of the definition of 'manufacturer' is one who manufactures or assembles 'motor vehicles'. The temporary exemption authority appears directed towards commercial enterprises and not single motor vehicles. Nevertheless, we believe we have the authority to exempt a single motor vehicle under these provisions. If you wish to consult us further in this matter, Taylor Vinson will be pleased to help you. Sincerely, Paul Jackson Rice Chief Counsel"; |
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ID: aiam4226OpenMs. Lisa Kreeger, Reichert, Strauss & Reed, 2510 Carew Tower, Cincinnati, OH 45202; Ms. Lisa Kreeger Reichert Strauss & Reed 2510 Carew Tower Cincinnati OH 45202; Dear Ms. Kreeger: This responds to your letters of June 27, 1986, and July 11, 1986, an your subsequent phone conversations with Stephen Oesch of my staff concerning the safety belt installation requirements for multipurpose passenger vehicles and buses. I regret the delay in our response and hope the following information is of assistance to you.; As Mr. Oesch discussed with you, Federal Motor Vehicle Safety Standar No. 208, *Occupant Crash Protection*, sets forth the safety belt installation requirements for passenger cars, trucks, multipurpose passenger vehicles and buses. The standard, a copy of which is enclosed, regulates only the installation of safety belts and does not require their use. However, the Federal Highway Administration's Office of Motor Carriers has issued a regulation (49 CFR Part 392.16) that requires safety belt use by operators of trucks and buses involved in interstate commerce. Belt use is also governed by State mandatory use laws.; S4.2.2 and S4.3 of the standard set forth the safety belt installatio requirements for new multipurpose passenger vehicles (MPV's). Our regulations (49 CFR 571.3) define an MPV as a 'motor vehicle with motive power, except a trailer, designed to carry 10 persons or less which is constructed either on a truck chassis or with special features for occasional off-road operation.' S4.2.2 and S4.3 of Standard No. 208 require the installation of a safety belt for each designated seating position in a MPV.; S4.4 of the standard sets forth the safety belt installatio requirements for buses. Our regulations define a bus as a 'motor vehicle with motive power, except a trailer, designed for carrying more than 10 persons.' S4.4 of Standard No. 208 requires the installation of a safety belt at only the driver's designated seating position in a bus. The agency has set additional safety belt requirements for school buses with a gross vehicle weight rating of 10,000 pounds or less. S5(b) of Standard No. 222, School bus passenger seating and crash protection, requires the installation of a safety belt at the passenger seats in those small school buses. A copy of Standard No. 222 is enclosed.; If you have any further questions, please let me know. Sincerely, Erika Z. Jones, Chief Counsel |
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.