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: nht78-3.48OpenDATE: 02/03/78 FROM: AUTHOR UNAVAILABLE; John Womack; NHTSA TO: Rhoda; Stoudt & Bradley TITLE: FMVSR INTERPRETATION TEXT: This is in response to your letter of December 23, 1977, requesting clarification as to whether the modified Odometer Disclosure Form which you prepared would meet the Federal requirements. Specifically, you are requesting permission to inform the buyer of the vehicle that the mileage is unknown because the vehicle was subject to a commercial lease. It has been the position of the National Highway Traffic Safety Administration that if the seller does not know that the mileage indicated is wrong, he should not state that the mileage is unknown. More than mere lack of knowledge is necessary to check the mileage unknown box. The seller is not, however, precluded from adding a statement that the vehicle was subject to a commercial lease or otherwise outside of his control. It appears from the form which you submitted that you are modifying the disclosure statement which is no longer to be used. The form was substantially changed, with those amendments to be effective as of January 1, 1978. For your information, I have enclosed a copy of the Federal Register notice of the amendments. Your client must certify to the accuracy of the odometer to the best of his or her knowledge under the amendments, however, as I stated before, he or she is free to add additional statements explaining the vehicle's history. |
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ID: nht78-3.49OpenDATE: 04/24/78 FROM: AUTHOR UNAVAILABLE; John Womack; NHTSA TO: Alliance of American Insurers TITLE: FMVSR INTERPRETATION TEXT: This is in response to your letter of March 22, 1978, requesting that the National Highway Traffic Safety Administration (NHTSA) interpret "primary place of business" under 49 CFR Part 580 to include regional offices and other places of business where companies' records are customarily maintained. It is our opinion that "primary place of business" includes, in the case of a business with multiple offices, a regional or local office where transactions involving the subject vehicles took place and the records are maintained, in addition to the home office or headquarters of the business. For example, if a vehicle is repossessed by an insurance company that has its home office in New York, but the regional office in Chicago handled and retained all the paperwork on the repossessed vehicle, then the Chicago office would be the primary place of business for that transaction and the odometer disclosure statements should be retained in the Chicago office. The office that the purchaser dealt with would be the one he would contact if a problem arose at a later time. Therefore, it would be the logical office to maintain the records. If, however, the Chicago office handled the paperwork but upon completion forwarded it to the New York office, the New York office, as the repository for all paperwork, would be the primary place of business and odometer statements, like all other documents should be forwarded to that office. The place of retention, like the manner of retention, must be consistent so that systematic retrieval is possible.
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ID: nht78-3.5OpenDATE: 02/22/78 FROM: AUTHOR UNAVAILABLE; Francis Armstrong; NHTSA TO: Asthi Glass Company, Ltd. TITLE: FMVSS INTERPRETATION TEXT: This is in reply to your inquiry of January 23, 1978. Speedometer covers on motorcycles are not subject to FMVSS No. 205. |
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ID: nht78-3.50OpenDATE: 03/14/78 FROM: AUTHOR UNAVAILABLE; John Womack; NHTSA TO: Rohm and Haas Company TITLE: FMVSR INTERPRETATION TEXT: This is in response to your letter of January 27, 1978, requesting that the National Highway Traffic Safety Administration review the draft of the form with which you propose to satisfy the Federal odometer requirements. The form you are proposing to use differs from the Federal form in that the two sets of certifications are combined into an introductory certification with four exceptions. The regulations require the transferor to certify that the odometer reading reflects the actual mileage, reflects the mileage over 99,999 miles, or is not actual. Your form would allow a transferor to execute a disclosure statement without making any of the above certifications. The introductory statement says "if none of the exception block(s) below is checked, the Seller hereby certifies. . . ." Therefore, by checking the third or fourth box the transferor would be indicating that the exception applies but neither of the introductory statements applies. For this reason we cannot give our approval to use this form as the Federal disclosure form. |
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ID: nht78-3.6OpenDATE: 09/07/78 FROM: AUTHOR UNAVAILABLE; J. J. Levin, Jr.; NHTSA TO: Motorcycle Trades Association, Inc. TITLE: FMVSS INTERPRETATION TEXT: This responds to your letter concerning the "edge treatment" requirements of Safety Standard No. 205, Glazing Materials, as they would apply to rigid or flexible plastics to be used for windshields on motorcycles. You asked for confirmation that one-piece plastics are required to meet the edge treatment requirements set forth in the standard for non-laminated glass. The edge treatment requirements of Standard No. 205 are specified in paragraph S5.2, which incorporates by reference the SAE Recommended Practice J673a, "Automotive Glazing," August 1967. The SAE Practice specifies different requirements for "tempered" and "laminated" safety glass. The agency interprets the distinctions to apply equally to plastics. Therefore, one-piece plastic materials must meet the edge treatment requirements specified for "tempered" glazing, and laminated plastics must meet the requirements specified for "laminated" glazing. Please contact this office if you have any further questions. Sincerely, ATTACH. Motorcycle Trades Association, Inc. June 13, 1978 Office of the Chief Counsel -- National Highway Traffic Safety Administration Re: FMVSS No. 205 Paragraph S 5.2 In the above-mentioned section, edges of glazing materials (except in school buses) that are exposed must meet the requirements of SAE Recommended Practice J673a, August 1967. The usual practice in the motorcycle industry is to use rigid or flexible plastics for windscreens and windshields for motorcycles. In most cases, these plastics meet the requirements of the ANSI Z26 standard in full; occasionally, these materials may use the (Illegible Word) from the chemical tests in Z26 when used in areas not requisite for driving visibility. SAE J673a in virtually all of its wording speaks specifically of "Safety glass" and the edge treatment requirements differ for "tempered" and "laminated" materials. Please confirm for us that one-piece (that is, non-laminated) plastics materials are required to meet the edge treatment requirements set forth for non-laminated glass in the SAE standard. Thank you for your assistance, Bruce Henderson Vice-President, MTA |
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ID: nht78-3.7OpenDATE: 01/26/78 FROM: AUTHOR UNAVAILABLE; J. J. Levin, Jr.; NHTSA TO: Oklahoma Department of Public Safety TITLE: FMVSS INTERPRETATION TEXT: This responds to your letter of December 9, 1977, asking whether the recent amendment of Safety Standard No. 205, Glazing Materials, permits the use of plastic glazing in school buses. The answer to your question is yes. Safety Standard No. 205, as amended December 5, 1977 (42 FR 61465), allows the use of rigid plastic glazing in doors and windows of all buses, including school buses. Please note, however, that plastics cannot be used for bus windshields or in doors or windows to the immediate right or left of the driver. Sincerely, ATTACH. Oklahoma Department of Public Safety December 9, 1977 Hugh Oates -- National Highway Traffic Safety Administration Dear Mr. Oates: RE: Motor Vehicle Safety Standard #205 as amended by the Federal Register Docket #71-1, Notice #6, published 12-5-77 On December 5, 1977, a notice was published in the Federal Register amending Motor Vehicle Safety Standard #205, glazing material, which added to the list specified in ANS Z26, items 4 and 5 allowing the use of plastics in the side windows of buses. My question is, does this also include the use of items 4 and 5 of the ANS Z26 Standard in school buses. Sincerely, Joe Wall, Asst. Director -- Vehicle Inspection Division |
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ID: nht78-3.8OpenDATE: 05/12/78 FROM: AUTHOR UNAVAILABLE; J. J. Levin, Jr.; NHTSA TO: Susan H. Soodek TITLE: FMVSS INTERPRETATION TEXT: This responds to your recent letter asking whether Federal Safety Standard No. 205 specifies requirements limiting the reflectivity of glazing materials. You are concerned with the lack of uniformity in state laws that prohibit nontransparent or reflective windows in motor vehicles. The stated purpose of Safety Standard No. 205, Glazing Materials, is to reduce injuries resulting from impact to glazing surfaces, to ensure a necessary degree of transparency in motor vehicle windows for driver visibility, and to minimize the possibility of occupants being thrown through the vehicle windows in collisions. The standard does not prohibit reflective glazing, nor does it specify requirements that would limit the degree of reflectivity of glazing materials. Since reflectivity is not an aspect of performance governed by Federal safety standards, state laws concerning glazing reflectance would not be preempted by Standard No. 205. Safety Standard No. 205 does, however, specify requirements for the luminous transmittance of glazing materials for use in motor vehicles. Therefore, state laws prohibiting nontransparent windows would be preempted if they attempted to regulate the glazing manufacturer or the vehicle manufacturer (15 U.S.C. 1392(d)). State regulations applicable to the vehicle owner or user would not be preempted, on the other hand, since the Federal regulation is only applicable to the manufacturer. Therefore, a state law could prohibit the application of a nontransparent decal on a window by a vehicle owner, for example. I am enclosing a copy of the California Highway Patrol petition for rulemaking regarding glazing abrasion requirements and glazing reflectivity. A notice concerning this petition will be issued at some time in the near future. I must point out that our statutory authority requires all safety standards to be reasonable, objective and to meet the need for motor vehicle safety. The agency cannot, therefore, regulate an aspect of motor vehicle performance or design if there is no data or evidence indicating that a safety problem exists. I hope this has been responsive to your inquiry. Please contact Hugh Oates of my office if you have any further questions. SINCERELY, AUTOMOTIVE PARTS & ACCESSORIES ASSOCIATION March 30, 1978 Joseph Levin Chief Counsel National Highway Traffic Safety Administration Dear Mr. Levin: This letter is to request a formal interpretation of FMVSS #205, Glazing Materials, as to the permissibility of reflective material. In addition, we have posed specific questions under #205 regarding federal jurisdiction and applicability of the Standard. Our desire is to prevent the possible emergence of fifty varying state laws governing reflectance. May we provide an explanation of our interest, and previous communication with the NHTSA on the subject. APAA is a national trade association representing nearly 1400 manufacturers, retailers, wholesale distributors, and independent sales agents doing business in the volume aftermarket industry. Among our members are manufacturers of a variety of window covering materials, including screens, reflective materials, and tinted materials. As a service to these manufacturers and our retailers, we attempt to keep abreast of state laws bearing upon the sale and use of various window covering materials. The following states have enacted regulations prohibiting nontransparent or reflective windows: Colorado, Florida, Kansas, Nebraska, Ohio, Utah, and Virginia. The states of California and Pennsylvania are considering the same. Lesser restrictions exist in Maryland, New Mexico, and Texas. With only two exceptions, the terms "nontransparent" and "reflective" are undefined and enforcement is left to the judgement of police, the Highway Patrol, or an inspection official. (See enclosed APAA prepared summary bulletin). This lack of definition has resulted in violations for windows which actually complied with federal visibility requirements as defined by ANSI Z26. Yet, some of the states have demanded recall of reflective windows, the related costs and logistical problems of which severely disrupt interstate commerce and can drive a small manufacturer out of business. Uniformity, through federal preemption, would allow our manufacturers to comply in "good faith" with reflectance requirements. On March 13, Mr. Guy Hunter (engineer) and Mr. Hugh Oates (legal adviser) to FMVSS # 205 met with Mr. Russ Simmons of West Custom Windows, an APAA-member company, Mr. Julian C. Morris, APAA President, and myself to discuss the association's request for an amendment to the standard to address reflectance levels. We were advised the NHTSA may be considering the reflectance issue in response to a petition filed last year by the California Highway Patrol. May we be furnished with a copy of the CHP's petition and be apprised of rulemaking status? Presumably, the Administration has not previously addressed reflectivity in FMVSS #205 because reflective windows have not created an established safety hazard. However, could not an amendment be made on the basis of benefits in safety from filtering out glare or benefits in fuel economy from the insulation properties of reflective material? What type of data is acceptable to demonstrate that establishing an acceptable percentage reflectance level would result in safety and fuel economy benefits? A legal opinion from your office would provide clarification that the federal standard does not prohibit reflective material. The crux of the problem, it would appear, lies in applicability of FMVSS #205. At the March 13 meeting at NHTSA headquarters, staff advised us that the standard applies to the vehicle manufacturer, not the motorist. Are the states then on sound legal ground to regulate the vehicle owner, even a state's interpretation of "nontransparency" is stricter than the visibility definition incorporated by #205? Your response to these questions will, hopefully, provide reasonable guidelines for dealing with the existing ambiguities. Susan H. Soodek Assistant Director, Government Affairs & Liaison [ENC. OMITTED] |
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ID: nht78-3.9OpenDATE: 03/08/78 FROM: AUTHOR UNAVAILABLE; E. T. Driver; NHTSA TO: O'Sullivan Corporation TITLE: FMVSS INTERPRETATION TEXT: This is in reply to your letter of February 3, 1978, to Mr. Guy Hunter of my staff, requesting assignment of a "DOT" code number for purposes of Federal Motor Vehicle Safety Standard (FMVSS) No. 205, Glazing Materials. You state that you supply vinyl plastic sheeting to your customer who, in turn, laminates and polishes this sheeting for use as glazing in the rear window opening of convertibles. Under paragraph S6 of FMVSS No. 205 (a copy was previously mailed to you), the assignment of a code number is restricted to prime glazing material manufacturers. Prime glazing material manufacturers are those who either fabricate, laminate, or temper the glazing material. Since you merely supply the material to your customer who then laminates and polishes it for use as glazing, you are not considered the prime manufacturer and assignment of a code number to you is not appropriate. Your customer is the prime manufacturer in this case and it is his responsibility to certify that his glazing meets the requirements by the means specified in FMVSS No. 205. If I can be of further help, do not hesitate to contact me. Sincerely, ATTACH. O'Sullivan Corporation February 3, 1978 Guy Hunter -- NATIONAL HIGHWAY & TRAFFIC SAFETY ADMINISTRATION Dear Mr. Hunter: We used to calender clear vinyl plastic sheeting which was subsequently laminated and polished and used in the automobile rear windows. Our former customer recently ordered another quantity of this plastic. We understand that suppliers of this type of materials must obtain a D.O.T. number and we would appreciate having one assigned to us. Yours very truly, R. C. Evans, Vice President Director of Research & Development cc: J. S. Campbell; C. R. Creamer; N. R. Hamblin |
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ID: nht78-4.1OpenDATE: 03/09/78 FROM: AUTHOR UNAVAILABLE; John Womack; NHTSA TO: The Reynolds and Reynolds Company TITLE: FMVSR INTERPRETATION TEXT: This is in response to your letter of February 3, 1978, requesting that the National Highway Traffic Safety Administration review your small Odometer Mileage Statement Form ODOM-1030N, your large Odometer Mileage Statement Form ODOM-105-N, and your Retail Buyers Order. It is our opinion that the forms which you submitted meet the Federal odometer requirements which became effective January 1, 1978. Thank you for your cooperation in preparing the forms. |
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ID: nht78-4.10OpenDATE: 09/05/78 FROM: AUTHOR UNAVAILABLE; J. J. Levin, Jr.; NHTSA TO: Vespa of America Corporation TITLE: FMVSS INTERPRETATION TEXT: This is in reply to your letter of July 3, 1978, requesting an interpretation of Motor Vehicle Safety Standard No. 108, specifically, whether turn signal systems installed on mopeds must meet the standard's requirements. One of NHTSA's engineers has informally advised you, in your words, "that because turn signal units on mopeds are not required devices. . . they are not required to meet the specific requirements in FMVSS 108 relative to motorcycles as long as they do not affect the operation of the other required equipment." We are pleased that Vespa is considering installing turn signal lamps on motor vehicles that S4.1.1.26 excuses from having them. If you wish to install systems that you intend to comply with Standard No. 108 and which for one reason or another fail to do so, it is doubtful that NHTSA would take any action against Vespa since the equipment is clearly optional and added only at a manufacturer's discretion. We would also view as preempted under Section 103(d) of the National Traffic and Motor Vehicle Safety Act any State action either to require turn signal lamps on mopeds or to establish requirements for such were they added at the option of the manufacturer. I hope this clarifies the matter for you. SINCERELY, vespa of america corporation July 3, 1978 Joseph J. Levin, Jr. Chief Counsel U.S. DEPT. OF TRANSPORTATION National Highway Traffic Safety Administration Dear Mr. Levin: It is suggested, by Mr. George Shifflet, that an official comment should be solicited from your office to verify our interpretation regarding voluntary equipment of turn signal systems on mopeds (motorized bicycles). It has been the understanding of Vespa of America Corporation that if a piece of equipment is offered on a moped which is exempted from its requirement (as turn signal systems are exempted as specified - FMVSS 108 Sec. S4.1.1.26) than that piece of equipment must meet all requirements set forth in the respective FMVS Standard. During my phone conversation with Mr. Shifflet, he offered information to the contrary. He stated, that because turn signal units on mopeds are not required devices under FMVS Standards, they are not required to meet the specific requirements in FMVSS 108 relative to motorcycles as long as they do not affect the operation of the other required equipment. If Mr. Shifflet's statement is true, then existing State requirements would apply to moped turn signal units. I am anxiously awaiting your comments as they are the basis for our action. I remain, Donald Beyer National Service Manager |
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.