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
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ID: nht70-1.26OpenDATE: 10/20/70 FROM: R. A. Diaz; NHTSA TO: L. C. Lundstrom; GM TITLE: FMVSS Interpretation TEXT: The Director has asked me to reply to your letter of September 29, 1970, concerning the compliance of certain motor vehicles, which General Motors intends to import, with Federal Motor Vehicle Safety Standard No. 206 - Door Locks and Door Retention Components. Each rear door of these vehicles has, in addition to a "conventional" locking mechanism, a special locking mechanism which is described in your letter as: "an additional lever located on the rear edge of each door which, when placed in its 'lock position', will only allow the door to be opened from outside the vehicle even if the conventional locking knob on the upper portion of the door inside the vehicle is in the unlocked position. The additional lever is covered when the door is closed." You ask whether the rear doors on these vehicles comply with @4.1.3 of Standard No. 206, which requires that each door "shall be equipped with a locking mechanism with an operating means in the interior of the vehicle." A somewhat similar problem was discussed in the preamble to the April 27, 1968 amendment (33 F.R. 6465) to the Standard. As stated there, @4.1.3 does not preclude the installation of a special locking mechanism in addition to the required locking mechanism. However, the required locking mechanism must be able to be engaged or disengaged regardless of whether any additional locking mechanism is engaged or disengaged. If the special locking mechanism does not interfere with the operation of the required locking mechanism on the doors in question, therefore, it will not constitute a failure to comply with the standard. Please write if I can be of any further assistance. |
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ID: nht70-1.27OpenDATE: 10/28/70 FROM: ROGER H. COMPTON -- NHTSA OFFICE OF OPERATING SYSTEMS MOTOR VEHICLE PROGRAMS TO: E. W. BERNITT -- VICE PRESIDENT SAFETY AND QUALITY ASSURANCE AMERICAN MOTORS CORPORATION JEEP CORPORATION TITLE: NONE TEXT: Dear Mr. Bernitt: This is in reply to your letter of October 12, 1970, to Mr. Charles A. Baker of this office in which you requested an interpretation of the phrase "effective projected illuminated area." Class A turn signal lamps are required by Section S3.1 of Federal Motor Vehicle Safety Standard No. 108, which references SAE Standard J588d in Tables I and III for these lamps. The requirements for the illuminated area of a turn signal lamp are specified in J588d as follows: "The effective projected illuminated area measured on a plane at right angles to the axis of the lamp must not be less than 12 sq. in. for Class A and 3 1/2 sq. in. for Class B." In the 45 degree visibility requirements, this standard further states "To be considered visible, the lamp must provide an unobstructed projected illuminated area of outer lens surface, excluding reflex, . . .". Our interpretation of effective projected illuminated area follows: The effective projected illuminated area is that area of the lens measured on a plane at right angles to the axis of the lamp, excluding reflex reflector, which is not obstructed by an opaque object such as a mounting screw, mounting ring or an ornamental bezel or trim. The above interpretation allows the area of rings or other configurations (raised portions) molded in the lens to be considered part of the total effective area, even if this area does not contribute significantly to the total light output. Sincerely,
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ID: nht70-1.28OpenDATE: 02/11/70 FROM: CLUE. D. FERGUSON -- OFFICE OF VEHICLE STRUCTURES, MOTOR VEH. PROGRAMS, NHTSA; SIGNATURE BY F.C. KOCH TO: Mr. Eddie E. Barnes TITLE: FMVSS INTERPRETATION TEXT: Thank you for your recent letter concerning the number of safety belts in your 1969 Chevrolet nine-passenger station wagon. The present Federal Motor Vehicle Safety Standard No. 208 requires that seat belt assemblies be installed in each forward-facing designated seating position in passenger cars. The standard does not apply to side-facing or rear-facing seats. The manufacturer is not required to install safety belts for such seats: however, in the interest of safety, most manufacturers usually install lap belts for the seating positions most commonly used. A Notice of Proposed Rule Making was issued on September 15, 1969, which would extend the applicability of Standard No. 208 to apply also to side-facing and rear-facing seats. The comments of those who responded to the Notice have been analysed and the final rule is now being developed. I am enclosing a copy of our present Standard No. 208 and a copy of the Notice of Proposed Rule Making for your reference. Thank you for your interest in motor vehicle safety. |
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ID: nht70-1.29OpenDATE: 02/04/70 FROM: D.W. TOMS -- DIR., NHTSA TO: Motorcycle Scooter & Allied Trades Association Inc. TITLE: FMVSR INTERPRETATION TEXT: RE: MARKETING OF COMPETITION MOTORCYCLES This is in response to your letter of November 19, 1969, in which you ask for an advisory opinion "as to the measures which an importer or distributor should take in order to assure compliance with regulations of the Federal Highway Administration in the marketing of motorcycles for competition use". Specifically, you note: "[The importation regulations appear] to require that the importer shall declare that motor vehicles imported for competition purposes will not be sold or licensed for use on the public roads. Hence there is some uncertainty whether this declaration connotes an implicit responsibility which survives sale to a purchaser not for resale". The declaration to which you refer, 19 CFR @ 12.80(b)(2)(vii), is the declaration that the vehicle is being imported for purposes of competition and that it will not be sold or licensed for use on the public roads. If we discover that a vehicle covered by such a declaration has been sold or licensed for use on public roads, we would then have to determine whether the declaration was a false one. In making this determination we would look to those factors which show that, at the time he made the declaration, the importer knew or had reason to know that the vehicle would be put to on-road use. If, for example, prior dealings with the vehicle's purchaser had made the importer aware of the purchaser's intent to divert vehicles to markets for so-called "street legal" motorcycles, it is very likely that we would conclude that a declaration that the vehicle will not be sold or licensed for use on public roads was false at the time it was made. In these circumstances, our conclusion would not be altered by the fact that, at the time he sold the vehicle, the importer supplied the buyer with a document specifying that the vehicle was intended only for purposes of competition. In short, we would look behind the sales agreement to the realities of the transaction as the parties knew them. Similarly, if relevant facts disclose that the importer seeks to evade his responsibilities by active promotion and sale to competition cycle purchasers of motor vehicle equipment which will make the competition machine "street local", and purchasers of competition machines are in fact buying such equipment for immediate conversion purposes, then a reasonable conclusion could be reached that a non-complying motor vehicle was being imported and offered for sale by the importer regardless of the declaration made at time of entry. In this sense there is "an implicit responsibility which survives sale to a purchaser not for resale". You also raise the following point: "It is understood that motorcycle manufacturers and importers should not equip competition motorcycles with devices and accessories that would render them lawful for use and registration for use on public highways. It would be normal industry practice, however, to catalog accessory items and parts which could be applied to competition machines by the ultimate purchaser. Since many competition motorcycles have a 'sister' model manufactured for highway use, the sale of such items is necessary. Thus a question of the propriety of this practice is raised." The mere cataloguing of parts equally applicable to both a competition motorcycle and a similar "sister" non-competition model does not appear to raise a question of propriety so long as other facts do not indicate that a significant number of purchases of these parts are made with the intention of conversion of competition motorcycles to street use. Finally you note: "Competition motorcycles are generally marketed through retail dealers in motor vehicles. Hence, the question arises as to whether this practice might continue without opposition by the Federal Highway Administrator." You have also requested a ruling "that sale of competition motorcycles be permitted through franchised dealerships". You should clearly understand that the National Highway Safety Bureau his no desire to alter existing methods of motor vehicle marketing; it does not intend to "oppose" and it has no power to "permit" the sale of motor vehicles. It does, however, have the power to classify a competition motorcycle as a "motor vehicle" if these vehicles are, in fact, being operated on the public roads to a significant extent, and if it believes that such a classification would reduce the toll of traffic injuries and deaths. But the mini-bike interpretation (34 F.R. 15416), referenced by you, states that marketing through retail dealers in motor vehicles is only one criterion which will be considered in any question of classification. Therefore importers and distributors of competition motorcycles which are sold through franchised dealerships are best advised in marketing these vehicles to follow the other criteria which the mini-bike interpretation sets forth. |
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ID: nht70-1.3OpenDATE: 09/17/70 FROM: AUTHOR UNAVAILABLE; L. R. Schneider; NHTSA TO: Univeral Tire Corporation TITLE: FMVSS INTERPRETATION TEXT: The Office of Trade Regulation Rules of the Federal Trade Commission has forwarded your letter of July 30, 1970, concerning tires marked "Radial" that have casing cord angles that vary as much as 15 degrees from 90 degrees. Paragraph 33 of Federal Motor Vehicle Safety Standard No. 109 -- New Pneumatic Tires, Passenger Cars -- defines a radial ply tire as a "pneumatic tire in which the ply cords which extend to the bends are laid at substantially 90 degrees to the centerline of the trend". The Bureau does not consider cords laid at 75 degrees to the centerline of the trend as "Radial" tires and tires marked as much would not be in compliance with the tire standard. Persons importing tires that do not comply with the standard would be violating section 108(a) (1) of the National Traffic and Motor Vehicle Safety Act of 1966 (15 U.S.C. 1397). For your information enclosed is a copy of the Passenger Car Tire Standard and the National Traffic and Motor Vehicle Safety Act. |
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ID: nht70-1.30OpenDATE: 01/06/70 FROM: AUTHOR UNAVAILABLE; C. A. Baker; NHTSA TO: Toyota Motor Company, Ltd. TITLE: FMVSS INTERPRETATION TEXT: Thank you for your letter of December 29, 1969, to Mr. J. E. Leysath of this Office, concerning an interpretation of paragraph S3.3 of Federal Motor Vehicle Safety Standard No. 108. The requirements and provisions of paragraph S3.3 are applicable to combinations of the required lamps, reflective devices and associated equipment as specified elsewhere in the standard. These requirements and provisions do not preclude the use of a non-required (ornamental) Class B reflex reflector in a combination rear lamp. I should also point out that effective January 1, 1970, the standard requires Class A rear reflex reflectors on all vehicles, including passenger cars. As you have proposed, such required Class A reflectors may be mounted separately from the combination rear lamp. |
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ID: nht70-1.31OpenDATE: 01/09/70 FROM: AUTHOR UNAVAILABLE; C. A. Baker; NHTSA TO: Dr. N. Kinon TITLE: FMVSS INTERPRETATION TEXT: Thank you for your letter of November 14, 1969, concerning electrically heated windshields. At present, we do not have a Federal Motor Vehicle Safety Standard which deals specifically with electrically heated windshields. This does not mean, however, that various states may not have restrictions covering this matter. Standard No. 205 stipulation both visibility and structural performance requirements for glazing surfaces used in automobiles as well as in other vehicles. If the product you manufacture meets the requirements of Standard No. 205, then it is acceptable under our existing regulations. We assume from previous conversations with Mercedes Benz that this electrically heated windshield would be offered as an optional piece of equipment. We understood that it would be used as a supplement to the standard blower-type defrosting system. If this is actually the case, then the electrically heated windshield would not have to meet the performance requirements of Standard No. 108, but the blower-type unit would have to pass the defrosting test. We recognize that the automotive industry has shown an increasing interest in using electrically heated glass to defrost windows. At present, several manufacturers offer electrically heated glass in the rear window (backlight) as an optional piece of equipment. Assuming that this product helps defrost glazing surfaces, we recognize that it has a safety potential that should be effectively utilized. On the other hand, we also recognize that this product could interfere with visibility, depending upon the wire size pattern and location. This is an area which needs further study. |
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ID: nht70-1.32OpenDATE: 01/19/70 FROM: AUTHOR UNAVAILABLE; Robert Brenner; NHTSA TO: U. S. Technical Research Corp. TITLE: FMVSS INTERPRETATION TEXT: This is in reply to your letter, dated November 11, 1969, in which you seek an interpretation as to how Federal Motor Vehicle Safety Standards (FMVSSs) 103 and 104 are applicable to cars equipped with right-hand drive or a central steering wheel. For motor vehicles equipped with right-hand drive, the windshield areas to be defrosted and wiped by FMVSSs 103 and 104 respectively, are mirror images of those areas required for vehicles equipped with left-hand drive. More information is required before a reply can be given on vehicles equipped with a central steering wheel. Defrosting and wiping areas requirements would naturally vary depending on the number and location of the front seat passenger seating positions in the vehicle equipped with a central steering wheel. We trust that we have been of assistance to you. |
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ID: nht70-1.33OpenDATE: 01/19/70 FROM: AUTHOR UNAVAILABLE; C. A. Baker; NHTSA TO: Ichikoh Industries, Ltd. TITLE: FMVSS INTERPRETATION TEXT: Thank you for your letter of December 16, 1969, concerning the relationship between performance requirements of Standard No. 108 and the referenced and subreferenced SAE standards in Standard No. 108. Public Law 89-563 requires that the motor vehicle safety standards be stated in terms of what is to be accomplished rather than in terms of specific designs, and that they be objective, reasonable, practicable, and meet the need for motor vehicle safety. In addition, the law required that the initial safety standards be based on existing standards. Initial Federal Motor Vehicle Safety Standard No. 108 was based on the existing SAE standards as specified in Tables I and III of Standard No. 108. In some instances, these specified SAE standards in turn subreference other SAE standards that are design oriented, particularly the subreferenced standards on bulbs, bulb sockets and sealed beam headlamp units. As provided by an interpretation (copy enclosed) issued on August 12, 1968, entitled, "Bulbs and Bulb Sockets," bulbs conforming to Table I of subreferenced SAE J573 and bulb sockets conforming to subreferenced SAE J567 need not be used in lamp assemblies meeting the requirements of Standard No. 108. Therefore, as an example, tail lamps need meet only the requirements of SAE J585c (including color test in accordance with SAE J578a) when tested in accordance with the specified Sections of subreferenced SAE J575c. The above interpretation does not apply to sealed beam headlamps. Paragraph S3.1.1 and Tables I and III of Standard No. 108 specify that headlamps shall be designed to conform to SAE J579a and J580a. These specified standards in turn subreference SAE J573b and J571b. The dimensional requirements of SAE J571b serve a need for safety in that replacement sealed beam units are readily available, and standardization of inspection equipment and procedures is possible. In summary, the referenced and subreferenced SAE standards are applicable except as specifically provided by the enclosed interpretation. With reference to the last paragraph in your letter, it is recognized that a manufacturer of motor vehicles may, as part of his contractual relationship with a supplier, require that the supplier certify conformance of the items provided by the supplier. Currently Public Law 89-563 does not require Ichikoh to certify conformance to Standard No. 108 of the lighting equipment it provides. However, an amendment to the standard has been proposed which would make the standard directly applicable to certain items of lighting equipment. This proposal would require Ichikoh to certify conformance, but only if Ichokoh were shipping such items directly to distributors and dealers in the United States. I enclose a copy of this proposal for your information. |
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ID: nht70-1.34OpenDATE: 01/21/70 FROM: AUTHOR UNAVAILABLE; Z. Taylor Vinson; NHTSA TO: American Motors Corporation TITLE: FMVSR INTERPRETATION TEXT: In your letter of January 14 you discuss providing a right hand drive automobile to an "individual wish 'Diplomatic Status'". Since the car does not comply with Federal motor vehicle safety standards you ask if American Motors could "Sell such a vehicle for operation in the United States and could we deliver the vehicle and omit the safety plate." Because section 108(a)(1) of the National Traffic and Motor Vehicle Safety Act of 1966 prohibits the sale of vehicles which do not comply(Illegible Line) delivery of this right hand drive automobile could not take place in the United States. If the sales contract is executed in England and the vehicle delivered in Canada, to name one possibility, there would be no objection to importation of the vehicle pursuant to the term of 10 C.F.R. @ 12.80(b)(2)(vi), assuming diplomatic eligibility of the importer. I enclose a copy of the importation regulation for your information. There is no requirement for affixation of the certification label under these circumstances. I am not aware of any law which would prohibit operation of a right hand drive vehicle in this country. |
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.