
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: nht71-4.8OpenDATE: 09/01/71 FROM: AUTHOR UNAVAILABLE; E. T. Driver; NHTSA TO: Latham; Pickard and Ennis TITLE: FMVSR INTERPRETATION TEXT: This is in reply to your letter of July 30, 1971, inquiring whether your client, American Jenbach Corporation, is required to comply with the Tire Identification and Recordkeeping regulations (49 CFR Part 574). In your letter you state that American Jenbach is engaged in the distribution of portable air compressors and pneumatic tools, the former being purchased in Europe and delivered to the plant in Burlington where tires are added to the wheels and other modifications are made. You state further that American Jenbach also reconditions compressors, and may replace tires as part of this process. The Tire Identification and Recordkeeping regulations apply to manufacturers, brand name owners, retreaders, distributors, and dealers of new and retreaded tires for use on motor vehicles manufactured after 1948, and to manufacturers and dealers or motor vehicles manufactured after that date (49 CFR @ 574.4). Whether the regulations apply to American Jenbach depends on (1) whether the portable air compressors are motor vehicles under the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1381 et seq., hereinafter the Act) and (2) whether American Jenbach is a manufacturer, brand name owner, retreader, distributor, or dealer of new or retreaded tires, or a manufacturer or dealer of motor vehicles. Section 102 of the Act (15 U.S.C. 1391) defines motor vehicle to mean "any vehicle driven or drawn by mechanical power manufactured primarily for use on the public streets, roads, and highways, except any vehicle operated exclusively on a rail or rails." Without additional information, such as pictures of the vehicles in question, we cannot give you a precise determination as to whether they are motor vehicles under the Act. However, the agency has determined that portable compressors of the type that are mounted on tires for purposes of being towed on public highways are motor vehicles under the Act, and has classified them as trailers under the motor vehicle safety standards and regulations issued pursuant to the Act. As such, they are subject to the Tire Identification and Recordkeeping regulations. Based upon your letter, it appears that American Jenbach Corporation is an importer of new portable compressors (trailers) and must meet the Tire Identification and Recordkeeping requirements applicable to motor vehicle manufacturers (section 574.10). In addition, under the Act American Jenbach may also be a distributor or dealer of these trailers and, if so, must also comply with the Tire Identification and Recordkeeping requirements applicable to dealers (section 574.9). Finally, American Jenbach would appear to be a tire dealer as to those tires that it replaces on reconditioned compressors and would be required to comply with the requirements applicable to tire dealers (section 574.7) with respect to those tires. If the vehicles in question are motor vehicles, American Jenbach is required to comply with certain requirements in addition to the Tire Identification and Recordkeeping regulations. Trailers must conform to the requirements of Motor Vehicle Safety Standard No. 108, which deals with lighting requirements, and must be certified as conforming to all applicable standards in accordance with section 114 of the Act, and the Certification regulations. As of October 1, 1971, American Jenbach must also comply with the Defect Reports regulations (49 CFR Part-573). Copies of these requirements and a copy of the National Traffic and Motor Vehicle Safety Act are enclosed for your guidance. If you have additional questions, please write to us. Enclosures |
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ID: nht71-4.9OpenDATE: 09/02/71 FROM: AUTHOR UNAVAILABLE; L. R. Schneider; NHTSA TO: Philadelphia Newspapers, Inc. TITLE: FMVSS INTERPRETATION TEXT: In your letter of August 18 you ask for a ruling on the permissibility of wiring one filement of a clearance lamp on your small delivery truck so that it would function as a stop lamp and turn signal lamp. Federal Motor Vehicle Safety Standard Ho. 108, Lamps, Reflective(Illegible Words), does not prohibit combining a clearance lamp with a stop lamp or a turn signal lamp. However, the maximum allowable mounting height above the road surface for stop lamps is 72 inches measured from the center of the item with the vehicle at curb weight. There is currently no restriction on the maximum allowable mount(Illegible Words) however they may not be amounted higher than(Illegible Word) inches on vehicles manufactured on or after January 1, 1972. These restrictions, however, do not apply to supplemental lamps mounted higher than 72 or 88 inches, as long as a vehicle is equipped with stop lamps and turn signal lamps located within the mounting range prescribed by Standard No. 108,(Illegible Word) inches to 72 or 83 inches, as applicable, above the road surface. The Federal motor vehicle safety standards do not apply to a vehicle "after the first purchase of it for purposes other than resale." If the alterations are to be made to vehicles already in the PHI fleet, the question of the legality of your modifications would be covered by regulations of the Bureau of Motor Carrier Safety, if your vehicles are subject to them, and by State and local laws. |
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ID: nht71-5.1OpenDATE: 11/17/71 FROM: AUTHOR UNAVAILABLE; J. W. Carson for E. T. Driver; NHTSA TO: Ward School Bus Mfg., Inc. TITLE: FMVSS INTERPRETATION TEXT: Your letter of October 28, 1971, to Mr. Stan Haranski, Truck Body and Equipment Association, Inc., concerning switching arrangements for school bus red signal lamps, has been forwarded to this Office for reply. Paragraph S4.1.4(a) of Federal Motor Vehicle Safety Standard No. 108 requires that the four red signal lamps be controlled by a manually actuated switch. A two-way switch, whereby all four lamps are activated when the switch is in one position, and the two rear lamps only are activated when the switch is in the opposite position, would not be in violation of this requirement of Standard No. 108. |
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ID: nht71-5.11OpenDATE: 12/02/71 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Lotus Cars Ltd. TITLE: FMVSS INTERPRETATION TEXT: This is in reply to your letter of November 16, 1971, in which you asked whether Standard No. 208 would require seat belt retractors to be installed after January 1, 1972, for the rear occasional seats of the Lotus Plan Plus Two. Our answer is that retractors will be required if the rear seats are "designated seating positions" as defined in our regulations at 49 CFR 571.3(b). The definition provides, among other things, that to be a designated seating position a seat must accomodate a 5th percentile adult female. To define an occupant of this size, the regulations incorporate a U.S. Public Health Service publication that includes the following specifications: weight, 104 pounds; standing height, 59 inches; sitting height, 30.9 inches; knee height, 17.9 inches; buttock-knee length, 20.4 inches. If the Plan Plus Two cannot accomodate a person of this size in the rear seat, it need not have a seat belt retractor for that seat. If such a person can be accomodated, then retractors will be required unless the seat is otherwise exempt by the definition as an auxiliary seating accomodation such as [a temporary or folding jump seat." We do not have the information necessary to judge whether the seat is exempt as an auxiliary seating accomodation. Please advise us if further explanation is necessary. |
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ID: nht71-5.12OpenDATE: 12/03/71 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Department of California Highway Patrol TITLE: FMVSS INTERPRETATION TEXT: Your inquiry concerning the certification required of seat belts installed in motor vehicles manufactured after January 1, 1972, has been brought to our attention. Motor Vehicle Safety Standard No. 208, which governs the installation of seat belts, requires belts to conform to Standard No. 209. Since Standard No. 209 is amended effective January 1, 1972, your question is whether a vehicle manufactured after that date must have seat belts that are certified as conforming to the new provisions of Standard No. 209. We construe Standard No. 208 to require only that the belts conform to Standard No. 209 as it was at the time of their manufacture. Thus, a belt manufactured before January 1 that conforms to the contemporaneous (pre-amendment) version of Standard No. 209 may be installed in a vehicle manufactured after that date. A belt manufactured after January 1, must, of course, conform to the amended version of the standard. |
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ID: nht71-5.13OpenDATE: 12/05/71 FROM: AUTHOR UNAVAILABLE; Dana L. Scott; NHTSA TO: Hess and Eisenhardt Company TITLE: FMVSR INTERPRETATION TEXT: This is in response to your letter of November 12, 1971. As correctly stated in that letter, there is no current requirement that multi-purpose passenger vehicles must comply with standards 105, 109, 110, 201, 202, 203, 204, 212, 214, 215, and 301. Additionally, the information depicted in the chart you provided is correct as of October 11, 1971. However, your dates for proposed future requirements (columns 3 and 5) may change. The small vans and similar type vehicles being converted for use as emergency medical vehicles are required to conform to the Federal Motor Vehicle Safety Standard definition for a "multi-purpose passenger vehicle," since they utilize a truck chassis. Contrary to your opinion concerning the safety hazard of the converted emergency vehicles, we have not received any factual data indicating that these converted emergency medical vehicles constitute a safety hazard to the general public, to the sick or injured occupants, or to the attendants who must operate such vehicles. As stated in our previous correspondence to you and Senator Robert Taft, Jr., at this point in time the Department is not in the position of proposing an expenditure for the construction of a prototype ambulance. Our limited resources are being devoted to those traffic safety programs which result in the greatest savings in lives and in the reduction of injuries. We are retaining your correspondence for reference. If, in the future, our priorities include the development of standards relating to the design of an emergency medical vehicle, please be assured that your interests will be fully considered. Your continued interest in our traffic safety programs is appreciated. |
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ID: nht71-5.14OpenDATE: 12/06/71 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Seats, Inc. TITLE: FMVSS INTERPRETATION TEXT: This is in reply to your letter of October 4, 1971, in which you asked our opinion as to whether Standard No. 207 permits a suspension type truck seat with fore and aft adjustment to be equipped with seat belt type webbing from the seat to the floor. It is our position that such webbing may be used to provide the strength required by Standard No. 207 and that a seat so equipped must conform to S4.2(c) of the standard (unless, as seems unlikely, the occupant's seat belt is anchored to the floor and not to the seat). Instructions for the adjustment of the seat to floor webbing are essential to the safe operation of such a system, however, and should be provided. I apologize for any inconvenience that our delayed response may have caused you. |
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ID: nht71-5.15OpenDATE: 12/07/71 FROM: AUTHOR UNAVAILABLE; F. Armstrong; NHTSA TO: Ernest Holmes Company TITLE: FMVSS INTERPRETATION TEXT: This is in reply to your letter of November 2, 1971, to Mr. George Shifflett of my staff, in which you ask questions relating to clearance lamp locations on your wrecker bodies. I am concerned with your statement that "there is no record of your department's approval on the clearance lamp corner mounting on the 750 and 850 bodies." The National Highway Traffic Safety Administration does not "approve" vehicles or equipment subject to the Federal motor vehicle safety standards. Conformance, and certification of that fact, are the manufacturer's responsibility under section 108(a) of the National Traffic and Motor Vehicle Safety Act of 1966. We are glad, however, to provide informal interpretations of the standards when requested to do so by manufacturers such as yourself. Your first question is, "Does the (low) location of the rear clearance lamp meet the position requirements?". Paragraph S4.3.1.5 of Federal Motor Vehicle Safety Standard No. 108 (effective January 1, 1972), permits a deviation in mounting height: "When the rear identification lamps are mounted at the extreme height of a vehicle, rear clearance lamps need not meet the requirement of Table II that they be located as close as practicable to the top of the vehicle." Thus, if the identification lamps are mounted at the extreme height of the vehicle, Standard No. 108 permits a location of clearance lamps at any height less than the extreme height of the vehicle. This does not change the requirement currently in effect (Table II). Your second question is, "Does the front clearance lamp location (on the body corner radius) on our 750 and 850 model bodies meet position requirements?". Standard No. 108 currently requires front clearance lamps to be located "as near as practicable to the upper left and right extreme edges of the vehicle." The requirement effective January 1, 1972, is that these lamps be located "to indicate the overall width of the vehicle . . . as near the top thereof as practicable." It appears from the photographs you enclosed that the front clearance lamps should be mounted higher on the body front, unless you have a good reason for determining that it is not "practicable" to do so. I trust this will answer your questions. |
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ID: nht71-5.16OpenDATE: 12/08/71 FROM: AUTHOR UNAVAILABLE; R. B. Dyson; NHTSA TO: Holophane Company, Inc. TITLE: FMVSS INTERPRETATION TEXT: This is in response to your letter of October 27, 1971, to David H. Soule of the National Highway Traffic Safety Administration concerning the requirements of Motor Vehicle Safety Standard No. 108 for school bus lighting. You are concerned with paragraph S4.3.4(b)(ii) which roads: "The system shall be wired so that the amber signal lamps are activated only by manual or foot operation, and if activated, are automatically deactivated and the red signal lamps automatically activated when the bus entrance door is opened." You have commented that "the use of the automatic system would make it mandatory that the red lights go on when the door is open and stop traffic where unnecessary -- such as railroad crossings." That is not correct. You will see from S4.1.4(b)(ii) that the red lamps are not automatically activated when the bus entrance door opens unless there has been prior manual or foot activation of the amber signal lamps. You are also concerned with the fact "that this automatic system is patented and only one manufacturer has the right to make it." Since you have not enclosed the copy of the patent enclosed in attorney Smith's letter to you dated June 4, 1970, I am unable to comment on your statement. I would like to point out that Standard No. 108 does not mandate the use of an amber-red lamp system; a system of red lamps only is also permissible. If the amber-red lamp system is used, paragraph S4.1.4(b)(ii) does not specify system design but only that the system be wired so that the driver can activate the amber lamp system at his option, and if he does activate it, that it automatically be deactivated and the red system automatically activated when the bus entrance door is opened. |
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ID: nht71-5.17OpenDATE: 12/09/71 FROM: AUTHOR UNAVAILABLE; E. T. Driver; NHTSA TO: Import-Export TITLE: FMVSS INTERPRETATION TEXT: This is in reply to your letter of November 20, 1971, to Mr. Franklyn Bergsman, National Highway Traffic Safety Administration, concerning your "Flash Mirrors." As described in the documents you furnished to us, your "Flash Mirror" does not appear to impair the effectiveness of the required lighting equipment. If this is indeed the case, the use of your "Flash Mirrors" as original vehicle equipment is not prohibited by the Federal Motor Vehicle Safety Standard No. 108. Nor is there a Federal prohibition against sale of your device in the aftermarket; Standard No. 108 covers only specified replacement lighting equipment for vehicles manufactured on or after January 1, 1972. Since your product is not regulated by Standard 108, the sale and use of it is, however, subject to the regulations of the individual States. |
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.