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: 2505yOpen Mr. Suichi Watanabe Dear Mr. Watanabe: This is in reply to your letter of March 19, 1990, asking whether a new combination rear lamp is permitted under Motor Vehicle Safety Standard No. l08. The lamp consists of three compartments. In its normal operating mode, when the taillamp and/or stop lamp are activated, all three compartments show a red light. Your question arises with respect to three different operating modes. The first occurs when the turn signal is activated; the red light in one of the compartments is replaced by an amber flashing one. The second occurs when the backup lamp is activated; the red light in another of the compartments is replaced by a white steady-burning one. The third occurs when both the backup lamp and turn signal are activated; in this event, the combination lamp would present an amber flashing light, a red steady-burning one, and a white steady-burning one. You have informed us that "the requirement of photometric and lighted area for each lamp function comply to FMVSS No. l08 and related SAE Standards." Further, as for the stop and taillamp functions, they comply with requirements for one and three compartment lamps when operating with one or three compartments (we assume that they would also meet the requirements for two compartment lamps). The lamp appears to be intended to fulfill the requirements of Standard No. l08 for turn signal, stop, tail, and backup lamps. Thus, your question appears to be whether Standard No. l08 requires separate lamps or compartments dedicated to a specific purpose, or whether your multiple purpose lamp is acceptable. Standard No. l08 does not prohibit a combination of the functions that any chamber of your lamp provides. When a specific function is activated, the lamp will perform that particular function in a manner that appears to meet the minimum standard established by Standard No. l08. Assuming that the CIE color definitions for white, amber, and red are met by the backup, turn, and stop/tail functions, the lamp appears to be permissible under Standard No. l08. Sincerely,
Stephen P. Wood Acting Chief Counsel ref:l08 d: 5/3l/90 |
1970 |
ID: 2506yOpen Mr. Suichi Watanabe Dear Mr. Watanabe: This is in reply to your letter of March 19, 1990, asking whether a new combination rear lamp is permitted under Motor Vehicle Safety Standard No. l08. The lamp consists of three compartments. In its normal operating mode, when the taillamp and/or stop lamp are activated, all three compartments show a red light. Your question arises with respect to three different operating modes. The first occurs when the turn signal is activated; the red light in one of the compartments is replaced by an amber flashing one. The second occurs when the backup lamp is activated; the red light in another of the compartments is replaced by a white steady-burning one. The third occurs when both the backup lamp and turn signal are activated; in this event, the combination lamp would present an amber flashing light, a red steady-burning one, and a white steady-burning one. You have informed us that "the requirement of photometric and lighted area for each lamp function comply to FMVSS No. l08 and related SAE Standards." Further, as for the stop and taillamp functions, they comply with requirements for one and three compartment lamps when operating with one or three compartments (we assume that they would also meet the requirements for two compartment lamps). The lamp appears to be intended to fulfill the requirements of Standard No. l08 for turn signal, stop, tail, and backup lamps. Thus, your question appears to be whether Standard No. l08 requires separate lamps or compartments dedicated to a specific purpose, or whether your multiple purpose lamp is acceptable. Standard No. l08 does not prohibit a combination of the functions that any chamber of your lamp provides. When a specific function is activated, the lamp will perform that particular function in a manner that appears to meet the minimum standard established by Standard No. l08. Assuming that the CIE color definitions for white, amber, and red are met by the backup, turn, and stop/tail functions, the lamp appears to be permissible under Standard No. l08. Sincerely,
Stephen P. Wood Acting Chief Counsel ref:l08 d: 5/3l/90 |
1970 |
ID: 1984-1.19OpenTYPE: INTERPRETATION-NHTSA DATE: 03/05/84 FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA TO: Stapleton Public Schools TITLE: FMVSR INTERPRETATION TEXT:
Mr. Ben Barbie Stapleton Public Schools P.O. Box 125 Stapleton, Nebraska 69163
Dear Mr. Barbie:
This is in further reply to your phone call of February 13, 1984, to the National Highway Traffic Safety Administration regarding the remanufacture of school buses using older model bus bodies on new chassis. You asked whether the school bus safety standards apply to a school bus manufactured with a 1976 model year body mounted on a new chassis.
The applicability of Federal Motor Vehicle Safety Standards is determined by the date of manufacture of the motor vehicle. For vehicles that are completed in several stages, the manufacturer can treat as the date of manufacture the date of the incomplete vehicle, the date of final completion of the vehicle, or a date between those two dates. An "incomplete vehicle" is defined in 49 CFR Part 568, Vehicles Manufactured in Two or More Stages, as: an assemblage consisting, as a minimum, of frame and chassis structure, power train, steering system, suspension system, and braking system, to the extent that those systems are to be part of the completed vehicle, that requires further manufacturing operations, other than the addition of readily attachable components, such as mirrors or tire and rim assemblies, or minor finishing operations such as painting, to become a completed vehicle.
The effective date of the school bus safety standards was April 1, 1977. Since the date of manufacture of the school bus chassis is after April 1, 1977, and the date of completion of the vehicle is after April 1, 1977, the completed school bus must meet the requirements of the school bus safety standards. It is extremely unlikely that the 1976 model year body will comply with the school bus standards since the body was manufactured before the effective date of the school bus standards. If your completed vehicle does not comply with the safety standards, your manufacturer, distributor, or dealer cannot certify it as conforming to such standards.
Sincerely,
Frank Berndt Chief Counsel |
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ID: nht73-5.44OpenDATE: 11/05/73 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Roy Stolpestad TITLE: FMVSR INTERPRETATION TEXT: This is in reply to your letter of October 11, 1973, concerning the 1966 Chrysler you recently purchased from Central Motors in Minneapolis. As Miss Porter correctly pointed out in her column, the Federal law on odometer fraud enables you to bring a civil action against Central. The amount of recovery in such an action can be substantial. If the court were to accept your estimate of damages of $ 1490.24, the damages assessable under Federal law would be three times that amount $ 4470.72. In no case would damages be less than $ 1500, a minimum value established by law. In addition, if you are successful, Central must pay your attorney fees as well as all court costs. I appreciate your concern for the costs of litigation. However, by providing for the payment of attorney fees the odometer law places you in a better position than a personal injury litigant whose recovery is usually diminished by his attorney's contingency fee. Your best course at this point is therefore to retain counsel if Central persists in its refusal to reimburse you. By way of advice to your attorney, I would point out that the "out" that Central claims to have taken -- checking the box on the disclosure form that indicates the true mileage is unknown -- was taken too late to be of benefit to them. The Federal regulation governing disclosure requires the disclosure statement to be made "before executing any transfer of ownership form." If they mailed the statement the next day, their disclosure was untimely. Moreover, the representations made in the newspaper advertisment are evidentiary of their representation of 33,000 miles as being the true mileage on the vehicle. Your success in finding the previous owner is also useful in establishing that the actual mileage was greater than shown. We will be willing to give you or your attorney further advice if questions arise concerning the intent and effect of the Federal odometer law. The enclosed copies of the law and regulations are provided to assist him in representing you. ENC. |
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ID: nht91-7.49OpenDATE: December 18, 1991 FROM: Paul Jackson Rice -- Chief Counsel, NHTSA TO: Masashi Maekawa -- Director, Technical Division, Ichikoh Industries, Ltd. TITLE: None ATTACHMT: Attached to letter dated 11-27-91 from Masashi Maekawa to Paul Jackson Rice (OCC 6714) TEXT: This responds to your letter of November 27, 1991, asking for an interpretation of Motor Vehicle Safety Standard No. 108 as it relates to a specific vehicle design. Your letter depicts a combination tail/stop lamp that would be mounted on the deck lid ("Lamp B"), immediately adjacent to a combination tail/stop lamp that is mounted on the vehicle body ("Lamp A"). Each lamp complies with the requirement for effective projected luminous lens area, but neither complies with photometric requirements. You have asked whether, under S5.1.1.6 it is possible to consider the two adjacent lamps as one lamp for purposes of measuring the photometrics for tail and stop lamps, and, if so, whether the requirements for one or two lighted sections will apply. S5.1.1.6 covers requirements for replacement stop lamps, and does not appear relevant to our question. We have, however, addressed before the question that you raise. It is not possible to consider the two adjacent lamps as one lamp for purposes of measuring the minimum photometrics required under Standard No. 108. We regard the lamp that is located on the body, Lamp A, as the lamp that must be designed to conform to all applicable requirements of Standard No. 108, including photometrics. In that location, Lamp A meets the requirement that stop/taillamps be located as far apart as practicable, whereas Lamp B would not. The requirements that would apply to Lamp A are those for lamps with a single lighted section. Since your letter indicates that Lamp A does not meet photometric requirements, Lamp A would be a nonconforming lamp. Lamp B is permissible as supplementary lighting equipment and need not meet the photometric or location requirements in order for the vehicle to comply with the standard. Thus, Lamp B would be permissible in its present state. (The sole restriction that Standard No. 108 imposes upon supplementary lighting equipment is that it must not impair the effectiveness of required lighting equipment; that possibility does not appear to exist in this design, where the two lamps are intended as complementary). |
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ID: nht89-2.96OpenTYPE: INTERPRETATION-NHTSA DATE: 09/07/89 FROM: STEPHEN P. WOOD -- NHTSA ACTING CHIEF COUNSEL TO: BOB BERGMAN -- COMMANDER U.S. ARMY MISSILE COMMAND AMCPM-FM-TM ALABAMA TITLE: NONE ATTACHMT: LETTER DATED 08/07/89 FROM JERRY L. DOOLEY -- US ARMY TO NHTSA; OCC 3833 TEXT: Dear Commander: This is in reply to a letter of August 7, 1989, from Jerry L. Dooley, Deputy Project Manager, Non-Line of Sight, with respect to "safety standards of the military nature", in particular those that would apply to the M1037 High Mobility Multipurpose Wheel Vehicle (HMMWV), as well as the M993 Bradley Fighting Vehicle System (BFVS). This agency has jurisdiction over all motor vehicles, defined as vehicles driven or drawn by mechanical power which are manufactured primarily for use on the public roads. Our principal role is the issuance of the Federal motor vehicle safety standards, and the monitoring of the notification and remedial campaigns of manufacturers upon the occurrence of noncompliances with the standards, or safety related defects in vehicles. We have never issued safety standards for military vehicles. Quite the oppo site; although we interpret our authority as covering military vehicles, the agency has always specifically exempted from compliance with the standards any motor vehicles manufactured for, and sold directly to, the Armed Forces of the United States in ac cordance with contractual specifications. Frequently, military contracts for procurement of vehicles will call for their conformance with the Federal safety standards, when the nature of the vehicle is such (e.g. passenger car, bus) that conformance with the standards is not inconsistent with th e configuration required to accomplish their mission. None of our safety standards for civilian vehicles cover driver field of view, basic visibility requirements, or ingress/egress. Our glazing standard does specify minimum levels of light transmittance, and our rearview mirror standard covers rear view mirror placement and rearward field of view. I am enclosing copies of these standards for your information. If you have further questions, we will be pleased to answer them. Sincerely, Enclosures - Standards Nos. 111, 205 |
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ID: nht93-8.30OpenDATE: November 23, 1993 FROM: John Womack -- Acting Chief Counsel, NHTSA TO: Jack McIntyre -- Vice President, Tie Tech Inc. TITLE: None ATTACHMT: Attached to letter dated 9/15/93 from Jack McIntyre to John Womack and (OCC-9123) and letter dated 8/18/93 from Jack McIntyre to John Womack TEXT: This responds to your letter in which you withdrew your petition for rulemaking of August 18, 1993, and requested an agency interpretation instead. You referred to the final rule issued by this agency on January 15, 1993 (58 FR 4585), which amended Federal Motor Vehicle Safety Standard (FMVSS) 222. Specifically, paragraph S5.4.2.(a)(1) of the amendment provides that wheelchair securement devices composed of webbing or straps must meet the requirements for Type I safety belt systems specified in S4.2, among others, of FMVSS 209. You stated that there is no need to specify a minimum width for wheelchair securement belts and that the current industry standard for securement belts is a 1-inch polyester belt. Finally, you stated that the 1-inch polyester belts have less stretch than the 1.8-inch nylon belts and that the 1-inch belts are easier and less cumbersome to connect to a wheelchair. Paragraph S4.2(a), FMVSS 209, provides that seat belt webbing cannot be less than 1.8 inches wide, "except for portions that do not touch a 95th percentile adult male with the seat in any adjustment position and the seat back in the manufacturer's nominal design riding position...." That means that seat belt webbing must be at least 1.8 inches wide whenever it touches the person of the seat occupant. The width of webbed wheel chair securement belts that do not touch the persons of the chair occupants is not specified in any standard. Therefore, wheel chair securement belts can be 1 inch or some other width, so long as they do not touch the persons of the chair occupants and meet the other requirements of applicable standards. I hope this clarifies this matter for you. If you have any further questions or need any further information, please feel free to contact Walter Myers of my staff at this address or at (202) 366-2992. |
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ID: nht93-4.21OpenDATE: June 3, 1993 FROM: Richard Glover -- Director of New Product Development, Evenflo Juvenile Furniture Company, Inc. TO: Deirdre Fujita -- NHTSA TITLE: None ATTACHMT: Attached to letter dated 10/20/93 from John Womack to Richard Glover (A41; Std. 213) TEXT: I had attempted to call you concerning the possibility of including a bar code which could be automatically scanned at the bottom of the Car Seat Registration Card which consumers fill out. This bar code would contain model number, date of manufacturer, and serial number for the product that the card represents. We feel that by adding an automatically scanned bar code section to the card, that it will eliminate the possibility of mis- keying any of this information, in as much as the human element has been removed from the card. We would request a white section to be allowed in the portion of the card which is currently specified to be a 10 percent minimum gray scale background. I have sent you a mock up of the possible location that this bar code may reside in, for your consideration. We have noticed on the cards which are coming back to us at Evenflo so far, that if any postal damage has occurred to the card, that is very likely to occur on the bottom edge of the card. As a result of that, it may be more advantageous to move this white space into the area immediately below the area that the consumer fills in. It would be approximately the same width as the zone that the consumer fills in, and simply be a white space slightly further down into the card. It would leave the gray background around the outside perimeter of the card and would allow us space to openly print the model number, date of manufacture, and serial number in case there were any difficulties in bar code reading. I would appreciate your consideration of this matter. Please advise us, as we are near the point of having to print additional cards at this time, and release printing lots to our printing company are at a rate of 500,000 cards per lot. If this will require a petition for a change in the current rules, please advise me so that we may petition as soon as possible. I remain,
Attachment (Child Restraint Registration Card) omitted. |
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ID: nht74-3.39OpenDATE: 05/06/74 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Rozner and Yorty TITLE: FMVSS INTERPRETATION TEXT: This responds to your March 26, 1974, request for information on seat belt regulations as they concern reclining passenger seats. Federal Motor Vehicle Safety Standard No. 208, Occupant Crash Protection, requires passenger cars to be equipped with seat belt assemblies, but it does not contain performance requirements to regulate the effectiveness of the belt assembly with the seating system in the reclining position. Federal Motor Vehicle Safety Standard No. 207, Seating Systems, specifies minimum safety requirements for motor vehicle seats. The requirements of the standard are based on conventional seat designs that normally incorporate a seat back angle of approximately 25 degrees rearward inclination from the vertical. Standard No. 207 requires that reclining seats be tested in their most upright position and does not require seats to be tested in the reclining position. The National Traffic and Motor Vehicle Safety Act of 1966 preempts state motor vehicle safety regulations which are not identical to the Federal standards with regard to the same aspect of performance and therefore any state law would be identical to Standards Nos. 207 and 208 on these aspects of performance (15 U.S.C. @ 1392 (d)). The engineering staff is not aware of any studies in the area of seat belts and reclining seats. Yours truly, ROZNER AND YORTY March 26, 1974 National Highway Traffic Safety Admin. Re: Three point restraint on reclining passenger seat Gentlemen: I represent a passenger who was injured while she was sleeping in a bed-like reclining passenger seat. She slid out the back. She had a conventional seat belt on, but it did not help. Are there any regulations either in the past or the future that would apply to this situation, either State or Federal? Have there been any studies on this subject or any interest in this subject. I shall appreciate whatever help you can give me. Very truly yours, William A. Goichman |
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ID: nht74-4.41OpenDATE: 01/11/74 FROM: AUTHOR UNAVAILABLE; R. B. Dyson; NHTSA TO: Corner Sterling & Machell Avenues TITLE: FMVSS INTERPRETATION TEXT: This is in reply to your letter of November 21, 1973 to "U.S. Bureau of Safety" expressing your view that "the automobile industry should . . . have some type of clutch to reverse action when the closing motion of the (power) window meets any resistance." I enclose a copy of Federal Motor Vehicle Safety Standard No. 118 Power-Operated Window Systems which has applied to all passenger cars and multipurpose passenger vehicles with power windows manufactured since February 1, 1971. The objective of the standard is to minimize the likelihood of injury or death occurring when a person is caught between a closing window and its frame, channel, or seat. The NHTSA determined that the most cost-effective way to accomplish this objective was by prohibiting operation of power windows when the ignition key is either in the ignition "off" position or removed. As you will see from the enclosure, consideration was given to mechanisms that would reverse the direction of the window. We appreciate your interest in motor vehicle safety. ENC. December 11, 1973 Dr. Irvin Jacobs, M.D. The circumstance and comment in your letter of November 21, 1973, regarding automatic window closing operation is noted. The matter is deemed to be in the jurisdiction of the U. S. Department of Transportation (DOT). Therefore, we are forwarding your letter with a copy of this acknowledgement to DOT for their attention and an appropriate reply. JOHN J. KLOCKO Chief, Materials Handling Technology Center cc: FMSMUSS-118 U.S. Dept. of Transportation November 21, 1973 U. S. Bureau of Safety Washington D. C. Gentlemen: Recently one of our young patients was brought in after having his head caught in the window of a car door after the automatic window closing operation had been started. Fortunately, this was not a serious accident; however, it could have been. It seems the automobile industry should be prevailed upon to have some type of clutch to reverse action when the closing motion of the window meets any resistance. Sincerely, IRVIN JACOBS, M.D. |
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.