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: nht94-5.1OpenTYPE: INTERPRETATION-NHTSA DATE: December 7, 1994 FROM: Philip R. Recht -- Chief Counsel, NHTSA TO: Herr P. Binder -- ITT Automotive europe TITLE: None ATTACHMT: ATTACHED TO LETTER DATED 11/22/94 FROM P. BINDER TO JOHN WOMACK (OCC 10510) TEXT: This responds to your FAX of November 21, 1994, to John Womack of this Office. You inquire with respect to a yellow bulb intended for use as both original and replacement equipment in a rear turn signal lamp for a passenger car. The bulb complies with ECE specifications. You have asked the following questions: "1) Is it allowed in USA that new rearlamps are fitted with such 'Europe' - bulbs?" Yes. Bulbs other than those specified by SAE J573 are considered "special bulbs" and are permitted by Note 3 at the end of Standard No. 108 as long as the lamp assemblies in which they are used conform to all applicable requirements of Standard No. 108. "2) Do spare bulbs of the same type (PY 21W) have to be freely available in USA (e.g. supermarket, station, etc.)?" There is no legal requirement that replacement bulbs be freely available. For reasons of safety, NHTSA encourages wide distribution of replacement parts of all sorts. "3) Would it be sufficient if the car manufacturer offers this bulb (PY 21W) as a spare part within his service stations in USA?" The determination of the distribution of replacement bulbs is a decision to be made by the car manufacturer. "4) Is there any specification or law regarding the use of bulbs in USA? If so, please inform us about these specifications." Although not directly incorporated by reference in Standard No. 108, NHTSA regards SAE Standards J567 "Lamp Bulb Retention System" and J573 "Lamp Bulbs and Sealed Units" as appropriate specifications for bulbs and their sockets used in motor vehicle lamp s other than headlamps. However, as indicated above, Note 3 permits the use of bulbs other than these. "5) Is the use of bulbs treated differently in the single states?" We have no information that any state treats the use of bulbs differently. Questions regarding the laws of the individual states are answered by the American Association of Motor Vehicle Administrators, 4600 Wilson Boulevard, Arlington, Va. 22203, and yo u may wish to consult them for an opinion. |
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ID: nht94-5.10OpenTYPE: INTERPRETATION-NHTSA DATE: December 15, 1994 FROM: Tom Hindson TO: Philip Recht -- Chief Counsel, NHTSA TITLE: NONE ATTACHMT: ATTACHED TO 4/24/95 LETTER FROM PHILIP RECHT TO TOM HINDSON (A43; VSA 102(4)) TEXT: Dear Mr. Recht, I have been told by other people within DOT that I should address my request to you. My company intends to develop and market a consumer device that fits on automobiles. It will be sold by dealers at time of new car purchase and will be installed by th e dealer. Basically it is comprised on a slim container holding a light weight car cover which will be bolted underneath the rear bumper and trunk of the automobile. By means of a handle(wand) and an electric motor which is supplied with power from the car's battery, the cover is propelled out of the container by means of motor driven rollers. The cover is then guided over the car and attached to the front bumper. When ready to leave, the handle switch is pressed and the whole operation reverses to that the cover is pulled off the car and back into the sealed container. The system does NOT: 1. Invade any fuel storage. 2. Invade any EPA device 3. Hinder the driver in any way. 4. Pose any ground clearance problems 5. Pose any electrical problems. A simple battery lead and rugged conduit is used. Please consider this system and give us a Letter of Interpretation concerning our compliance with any applicable safety standards. If more information is required please let me know. Thanks very much for your help. (PHOTOS OMITTED.) |
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ID: nht94-5.11OpenTYPE: INTERPRETATION-NHTSA DATE: December 16, 1994 FROM: Mark Warlick -- FMVSS Coordinator, Four Winds International Corporation TO: Philip Recht -- Chief Counsel, NHTSA TITLE: None ATTACHMT: ATTACHED TO 2/27/95 LETTER FROM PHILIP R. RECHT TO MARK WARLICK (REDBOOK (2); PART 302) TEXT: This letter concerns a question of what legal documentation is required for Federal Motor Vehicle Safety Standard No. 302 compliance. Four Winds International Corporation is a manufacturer of Class A and Class C motorhomes. I am in process of organizing our FMVSS letters of compliance from our vendors that supply our interior materials. I have included a sample of a letter that I hav e received from a vendor. Does this letter meet NHTSA requirements for certification of compliance for FMVSS No. 302 as far as proof of compliance by Four Winds? If this letter does not contain sufficient information to prove compliance by Four Winds, can you send me a sample of what we need in our records per vendor to show compliance? enclosure December 9, 1994 We have tested the panel from Northland Enterprise that was made with COR63-AX-40. We used the MVSS302 flame test, and obtained a flame rating of 0.64 inch per minute. If you have any questions regarding this information or on any products in general, please contact us. Sincerely, INTERPLASTIC CORPORATION Rey de la Rosa Group Leader Physical Testing |
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ID: nht94-5.12OpenTYPE: INTERPRETATION-NHTSA DATE: December 19, 1994 FROM: Glyn Thomas -- Thomas Tire TO: Walter Myers -- Department Of Transportation TITLE: Re: 19 CFR 12.80 ATTACHMT: ATTACHED TO 2/27/95 LETTER FROM PHILIP R. RECHT TO GLYN THOMAS (REDBOOK (6); PART 591; STD 109; STD. 119) AND 6/13/81 LETTER FROM FRANK BERNDT TO ROY LITTLEFIELD (STD 119) TEXT: I am writing to you after our telephone conversation of today's date. This is a very urgent matter and I am writing to ask for a waiver to be allowed to continue to import truck casings into the U.S.A. for the purpose of retreading. Some Japanese casings do not have the D.O.T. marking on the side wall. To allow for this, tires with less than 2/32" and being imported solely for the purpose of retreading are allowed entry. However, my point is that tires with less than 2/32" tread remaining are usually not of sufficiently good quality. I maintain that a declaration signed by the importer and confirmed by the receiving retread shop, at the time of entry, stating that the casings are being imported solely for the purpose of retreading, could [Illegible Word] solve this problem. If this is not done, then it would badly effect the total number of casings available for U.S. retread shops and definitely effect production. Is it possible to mail or fax me immediately, a waiver to this effect. Thus allowing the continued smooth import of casings. |
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ID: nht94-5.13OpenTYPE: INTERPRETATION-NHTSA DATE: December 19, 1994 FROM: Patricia J. Jackson -- Owner, Patnel Co.; Patt Jackson TO: Mr. Racht, Chief Council, NHTSA TITLE: None ATTACHMT: ATTACHED TO 3/3/95 LETTER FROM PHILIP R. RECHT TO PATRICIA JACKSON (REDBOOK (2); STD, 213; PART 302) TEXT: I have just received a patent on my cushion. I needed to know if their are any safety standards that I need to pass on my cushion. I am sending a pamphlet to help you under stand my product and how the cushion is used. Should I meet any fire safety st andards since my cushion is used by children of all ages. If you should have any question regarding this please feel free to call me at (314) 839-5382 ENCLOSURE December 19, 1994 Deirdre R. Fujita NHTSA Office of the Chief Counsel 400 Seventh Street, S.W. Room 5219 Washington D.C. 20590 RE: Phone call conversation in December 7, 1994 Enclosed is the brochure of my product "BoosterBuddy" a childs car cushion that comforts and protects. The cushion is used under the booster seat that is state regulated. This cushion has rolled pads on each side to provide comfort. The cushion prot ects tha car upholstery from the load bearing friction caused by the state regulated restraint seats. The cushion is used under the restraint seat from 0 to 40 pounds. The cushion can be used by the older child over 40 pounds with a safety belt. Please send me a letter stating if my product meets all safety regulations required. I am looking forward to hearing from you. Enclosure (OMITTED) |
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ID: nht94-5.14OpenTYPE: INTERPRETATION-NHTSA DATE: December 21, 1994 FROM: Philip R. Recht -- Chief Counsel, NHTSA TO: R. F. Wareham -- Technical Director, Total Vehicle Security, Ltd. TITLE: None ATTACHMT: ATTACHED TO LETTER DATED 1/26/93 FROM JOHN WOMACK TO DAVID H.B. LEE; ALSO ATTACHED TO LETTER DATED 12/9/94 FROM R. E. WAREHAM TO J. WOMACK (OCC 10573) TEXT: We have received your letter of December 9, 1994, to John Womack, the Acting Chief Counsel who responded to David Lee on January 26, 1993. This will confirm that his opinion regarding the "Third Brake Light Conditions Sensor" remains the official positi on of this agency. We shall be pleased to meet with you when you come to Washington late in January. You may phone Taylor Vinson of this Office to make arrangements (202-366-5263). We will be particularly interested in learning more about how the device "will be marketed as a D.I.Y. installation by the car owner." |
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ID: nht94-5.15OpenTYPE: INTERPRETATION-NHTSA DATE: December 21, 1994 FROM: Baysul Parker -- Manager, Safety Department, California Trucking Association TO: Paul Jackson Rice -- Chief Counsel, NHTSA TITLE: None ATTACHMT: ATTACHED TO 2/14/95 LETTER FROM PHILIP R. RECHT TO BAYSUL PARKER (A43; PART 567) 11/20/92 LETTER FROM PAUL JACKSON RICE TO J. LESLIE DOBSON, 7/1/92 LETTER FROM PAUL JACKSON RICE TO GENE FOUTS, 3/19/91 LETTER FROM PAUL JACKSON RICE TO JERRY TASS AN, AND 5/24/93 LETTER FROM JOHN WOMACK TO JOHN PAUL BARBER TEXT: I have received numerous inquiries recently regarding whether an alterer can alter and change the gross vehicle weight rating (GVWR) of a vehicle prior to sale or first registered, and also on used vehicles. This is generally in regards to vehicles with a GVWR of 26,001 lbs. or more, and the owner desires to lower the GVWR so that the driver would not be required to possess a commercial drivers license to operate. I have reviewed 49 CFR, Sections 567.4, 567.7 and 571.115. As I presently understand the statutes, only a manufacturer can assign a GVWR, including a VIN number. The original manufacturer, or an alterer approved by NHTSA who performs a manufacturing process prior to first sale or registration, can change the GV WR. Is there a list of NHTSA approved alterers? Please furnish any valid information, decisions and/or interpretations you may have that is related to this subject. |
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ID: nht94-5.16OpenTYPE: INTERPRETATION-NHTSA DATE: December 22, 1994 FROM: Philip R. Recht -- Chief Counsel, NHTSA TO: Michael Love -- Manager, Compliance, Porsche Cars North America, Inc. TITLE: None ATTACHMT: ATTACHED TO LETTER DATED 11/29/94 FROM MICHAEL LOVE TO NHTSA CHIEF COUNSEL (OCC 10533) TEXT: We have received your letter of November 29, 1994, asking for an interpretation of 49 CFR Part 591. Specifically, Porsche wishes to import vehicles for the Canadian market through the Port of Charleston, where certain processing activities will be performed on the cars before they are exported to Canada. The temporary importation of Canadian-market ca rs would be through 591.5(c) which allows importation "solely for export", provided that the vehicle is so labeled. You have asked for our concurrence in your interpretation of 591.5(c). We agree that Porsche may import and export Canadian-market cars under this section of the importation regulation. You foresee a situation in which "a Canadian vehicle with a unique combination of options might be sought by a U.S. customer". Porsche would like to be able to convert the vehicle to comply with the U.S. Federal motor vehicle safety standards after impo rtation and before it leaves Porsche's control. Porsche would also like to be able to re-import from Canada into the U.S. vehicles that would be converted to U.S. specifications. You have asked for confirmation that these operations would also be permi ssible under 591.5(c). Importation of noncomplying motor vehicles into the United States and their subsequent conversion to the U.S. Federal motor vehicle safety standards must be accomplished through the mechanisms established by Congress in the Imported Vehicle Safety Compli ance Act of 1988 (now 49 U.S.C. 30141 et seq.). First, NHTSA must have decided that the vehicle is eligible for importation pursuant to 49 CFR Part 593. Second, a vehicle intended for sale must be imported under bond by one who has been designated a Re gistered Importer under 49 CFR Part 592, who will undertake to bring the vehicle into compliance and to submit appropriate proof of this to NHTSA. Porsche may become a Registered Importer by filing an application under Part 592. If a vehicle intended for the Canadian market has been temporarily imported under 591.5(c), and Porsche then wishes to convert it to U.S. specifications rather than export it to Canada, you should telephone Clive Can Orden, Office of Vehicle Safety Compl iance (202-366-2830), to apprise him of the situation. We see no problem in this as long as NHTSA has decided that the vehicle is eligible for importation and Porsche provides a compliance package, in accordance with the requirements of Parts 592 and 59 3. |
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ID: nht94-5.17OpenTYPE: INTERPRETATION-NHTSA DATE: December 23, 1994 FROM: Philip R. Recht -- Chief Counsel, NHTSA TO: Paul N. Wagner, President, Bornemann Products, Inc. TITLE: None ATTACHMT: ATTACHED TO LETTER DATED 8-26-88 FROM ERIKA Z. JONES TO GLENN J. DUNCAN; ALSO ATTACHED TO LETTER DATED 9-28-94 FROM PAUL N. WAGNER TO MARY VERSAILLES (OCC 10392) TEXT: This responds to your letter of September 28, 1994, requesting an interpretation of how the requirements of S4.2.1 in Standard No. 207, Seating Systems, would apply to an integrated seat. Section S4.2.1 states Except for vertical movement of nonlocking suspension type occupant seats in trucks or buses, the seat shall remain in its adjusted position during the application of each force specified in S4.2. Your questions and our response to each follow. 1) Can the agency respond specifically to what the seat adjustment refers to? Does this mean only that once a seat recliner (used only for comfort), or a seat slide track, is positioned at its normal driving position, or appropriate testing position, it may not be moved until the completion of the test? Or, does it mean that while the static test is conducted a recliner mechanism, for example, can not change position during the test, due to bending or twisting, or release of internal parts, even though the frame did not break during the test? In oth er words, the recliner may bend or twist, but the seating structure remained intact, despite deformation of the recliner mechanism. Section S4.2.1 requires a seat, with one exception, to remain in the position to which it was adjusted while the force specified in S4.2 is applied. The exception is that vertical movement of nonlocking suspension type occupant seats may occur while the load is applied. Section S4.2 requires a seat to withstand certain specified forces. NHTSA has previously stated that S4.2 "allows some deformation of the seats during the force test, provided that structural integrity of the seats is maintained." (Se e August 26, 1988 letter to Mr. Glenn L. Duncan, Esq.) NHTSA would not consider any deformation allowed by S4.2 (for example, bending or twisting) by itself to be a change in adjustment position. However, if bending or twisting resulted in the seat movin g from one adjustment position to another (for example, a change in detent position within the adjustment mechanism), there would be a change in adjustment position. In the example provided in your letter, the adjustment position of the seat back recliner mechanism is caused by the gear mechanism being "destroyed," even though the recliner mechanism itself does not separate from the seat. It appears that this scenar io involves more than deformation as the seat back is free to move to a variety of adjustment positions. Therefore, the seat would not comply with S4.2.1. 2) An integrated seat has several angle adjustments on its recliner, which are only for the purpose of comfort. In reference to the static testing, does the integrated seat need to be tested in its designed riding position, or need it be tested in ev ery possible reclined position? Both S4.2(a) and S4.2(b) require the seat to withstand the specified load "(i)n any position to which it can be adjusted." The usage of the term "any," when "used in connection with a range of values or set of items," is specifically defined at 49 CFR 57 1.4 as meaning "the totality of the items or values, any one of which may be selected by the Administration for testing." Thus, NHTSA may chose to test a seat in any of the range of possible reclined positions. Section S4.2(c) incorporates the requiremen ts of S4.2(a) and S4.2(b); therefore, NHTSA may also chose to test an integrated seat in any of the range of possible reclined positions. I hope this information has been helpful. If you have any other questions, please contact Mary Versailles of my staff at this address or by phone at (202) 366-2992. |
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ID: nht94-5.18OpenTYPE: INTERPRETATION-NHTSA DATE: December 23, 1994 FROM: Deborah K. Nowak-Vanderhoef -- Attorney, GM TO: Philip R. Recht -- Chief Counsel, NHTSA TITLE: Re: Alternative To 9005 & 9006 Bulbs: ATTACHMT: Attached to 1/27/95 letter from Philip R. Recht to Deborah K. Nowak-Vanderhoef (A43; Std. 108) TEXT: General Motors Corporation (GM), in conjunction with Osram Sylvania Inc., has developed alternatives to two existing HB3 and HB4 (9005 and 9006) bulbs approved for automotive use in FMVSS 108, Lamps, Reflective Devices, and Associated Equipment. The alt ernative bulbs have a different base configuration than the currently approved bulbs, but in all other ways are identical. The alternative configuration would allow packaging flexibility while still maintaining all photometric/output characteristics of the currently approved 9005-6 bulbs. Since the alternative bulbs improve packaging flexibility without affecting the output of the lamps, GM would like the alternative bulbs to be interchangeable with the currently approved 9005-6 bulbs. We request your Office's guidance as to the most app ropriate method for seeking approval of the alternative bulb configurations. BACKGROUND The currently approved 9005-6 bulbs have bases that form right angles (see attachment 1). This configuration provided the most appropriate means of meeting automotive packaging considerations when these bulbs were originally approved. Since then, however, aerodynamics and styling have dramatically affected the construction of the front of vehicles. In some instances it has become very difficult to package the currently approved 9005-6 bulbs. In addition, the bulbs can be difficult t o access for replacement. It occurred to GM and Osram Sylvania that the situation could be improved with a simple modification to the existing 9005-6 bulbs. By straightening the base of these bulbs (see attachment 2), while keeping all other design criteria the same, the packagi ng could be improved without affecting any performance characteristics of the bulbs. Since the new configurations are identical with the currently approved bulbs in all ways other than the bases, GM believes it appropriate to allow them to be interchangeable with the existing 9005-6 bulbs. This would further enhance packaging flexibilit y by allowing alternative configurations which might be better suited to late program design changes. The alternative bulbs will have little or no affect on the consumer. A vehicle will come equipped with one of the bulb configurations, and the operator's manual will reference the appropriate configuration. If the alternative bulb is inadvertently purc hased for replacement, it could be used in all cases except in the highly unlikely circumstance that the vehicle packaging is so restrictive as to prevent the bulb from being inserted. Once inserted it is designed to perform identically to the bulb that has been replaced, regardless of the configuration of the base. In the unlikely case that the bulb could not be inserted because of restrictive packaging, the owner would need only to return the inappropriate bulb for the bulb approved for his or her v ehicle - a situation that exists today. To further minimize any confusion on the part of the consumer, we would recommend that the alternative bulbs have a unique identifier to distinguish them from the current bulbs. This could easily be accomplished by adding a character to the codes of the existing bulb. For example, HB3S and HB4S could be used to identify the alternative bulb configurations of HB3 and HB4. APPROVAL PROCESS GM believes there are three possible methods that could be used for seeking approval of the 9005-6 bulb alternative configurations. They are 1. Seek approval of the alternative configuration through 49 CFR Part 564. The language of Part 564 suggest that we would be unable to maintain interchangeability between alternative configurations and the currently approved 9005-6 bulbs. We understand these provisions were adopted to prevent interchangeability between bulb s with different photometric output, since such interchangeability could have drastic effects on headlamp beam patterns. This, however, is not the case with the alternative bulbs GM proposes. Except for the bases, they are identical in all respects to the currently approved 9005-6 bulbs. Therefore, there is no photometric difference between the two sets of bulbs, and hence, no safety concern. Still, the wording in Part 564 would suggest that the alternative bulbs we developed would require a new or different connector than 9005-6. We do not believe that this is appropriate in this instance, and seek clarification of whether Part 564 direc tly applies to this circumstance. 2. Petition for FMVSS 108 rulemaking to allow new bulb configurations as alternatives to the currently approved 9005-6 bulbs. While this appears to be a valid method for obtaining approval of the proposed configurations, it is our understanding that NHTSA is planning to transfer all bulb specifications from the body of FMVSS 108 into Part 564. Therefore, we believe that the agency may not welcome a petition to amend FMVSS 108 to comprehend additional bulbs (or new bulb configurations). 3. Request that the currently approved 9005-6 bulbs be placed in Part 564 with the alternative configurations included on the drawing. Attachment 3 contains a draft of what the drawings might look like. Please confirm which method the agency believes is most appropriate for seeking approval of the new alternative bulbs which, as described above, except for their bases perform identically to the currently approved 9005-6 bulbs. Sincerely, |
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.