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: nht68-3.21OpenDATE: 04/04/68 FROM: AUTHOR UNAVAILABLE; John R. Jamieson; NHTSA TO: The Firestone Tire & Rubber Company TITLE: FMVSS INTERPRETATION TEXT: Your petition of March 7, 1968, requesting a reduction in the high speed performance test (Section S5.5) of the Federal Motor Vehicle Safety Standard No. 109 (23 CFR, Part 255) for special heavy gauge troad taxi tires is denied. While we agree that some taxis are used for low speed intercity operation, many taxis now use high speed freeways for sustained periods of time. With the continuous expansion of freeways in metropolitan areas, the average service speed for taxi tires is certain to increase. In view of this, and because it is impossible to limit the use of taxi type tires to speeds lower than those presently permitted for other passenger vehicles, an amendment to Standard No. 109 exempting the heavy gauge tread tires from the high speed performance requirements, would not be in the interest of safety. For your future reference enclosed is a copy of Rule Making Procedures: Motor Vehicle Safety Standards as published in the Federal Register (32 F.R. 15816 - 15820). Your attention is directed to S210.31 which sets forth the procedural regulations for petitions for rule making. |
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ID: nht68-3.22OpenDATE: 04/06/68 FROM: ROGER H. COMPTON -- NHTSA; SIGNATURE BY DAVID A. FAY TO: Green and Green Manufacturing Company TITLE: FMVSS INTERPRETATION TEXT: Thank you for your letter of February 19, 1968, to Secretary Boyd, concerning the location of rear identification lamps on best trailers. Standard No. 108 permits rear identification lasts to be mounted at optional heights. Therefore, lamps mounted on extension brackets or add-on(Illegible Words) would be permissible. We would also point out that rear identification lamps are required only on those trailers that are 80 or more inches in overall width. Thank you for writing. |
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ID: nht68-3.23OpenDATE: 04/16/68 FROM: AUTHOR UNAVAILABLE; David A. Fay; NHTSA TO: Bayerische Motoren Werke TITLE: FMVSS INTERPRETATION TEXT: Thank you for your letter of February 21, 1968, to Mr. J. E. Leysath of this Bureau, concerning the use of tubular type bulbs in license plate lamps. Motor Vehicle Safety Standard No. 108 requires that license plate lamps conform to Society of Automotive Engineers (SAE) Standard J587b. SAE J587b in turn requires that bulbs and bulb sockets conform to SAE Standards J573b and J567b, respectively. Since tubular type bulbs and sockets for these bulbs do not conform to these SAE Standards, their use in license plate lamps would not be permitted under the requirements of Standard No. 108. Thank you for writing. |
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ID: nht68-3.24OpenDATE: 04/16/68 FROM: AUTHOR UNAVAILABLE; Joseph R. O'Gorman; NHTSA TO: R.J. Townsly TITLE: FMVSR INTERPRETATION TEXT: Thank you for your letter of February 23, 1968, to the Department of Transportation, in regard to information pertaining to importation into the United States of a right hand drive Canadian manufactured vehicle. If your vehicle was manufactured prior to January 1, 1968, the Federal Motor Vehicle Safety Standards would not apply, however, if built after January 1, 1968, full compliance to Federal Safety Standards is necessary. While it is not clear from your letter, the status of your visa, or how long you wish to have the car in the United States a solution to your problem may be provided by the regulations governing the importation of motor vehicles subject to the Federal Standards which became effective January 10, 1968. You will see from 19 CFR Section 12.80 (b) (v) of the regulations enclosed that a non-resident of the United States may import a non-confirming motor vehicle for personal use for a period of not more than one year, and that it may not be resold in the United States. The National Highway Safety Bureau has not been informed of the manner in which vehicles of Canadian manufacture, including those with right hand drive, do not comply with the Federal Standards. It would be best to communicate directly with the Canadian manufacturer as to the extent of modification necessary should you not come with the 12.80 (b) (v) exception. If we can be of further assistance, please let us hear from you. |
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ID: nht68-3.25OpenDATE: 04/22/68 FROM: AUTHOR UNAVAILABLE; Joseph R. O'Gorman; NHTSA TO: Badger Auto Body Company TITLE: FMVSS INTERPRETATION TEXT: Thank you for your cooperation and response to the Federal Highway Administration request regarding the "Certification Requirements." The information you have provided will be very useful to us; however, in accordance with Section 112 of the National Traffic and Motor Vehicle Safety Act of 1966, it would be appreciated if you would provide us with information as to where your tag will be located on your vehicles and also the serial identification system as requested in order that vehicles manufactured (complete) after January 1, 1968, can be identified. In regard to your question as to whether there is an exception to the law regarding the placement of the three light markers at the rear of your vehicle because of the limited space on your rear frame, the answer is there is no exception and adherence is required. One possible solution to your problem might be to mount an additional bracket to mount the cluster of lights. This is only a suggestion and you may be able to arrive at a more practical arrangement. Trusting this information answers your questions. |
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ID: nht68-3.26OpenDATE: 04/24/68 FROM: AUTHOR UNAVAILABLE; G. C. Nield; NHTSA TO: The Standard-Triumph Motor Company, Limited TITLE: FMVSS INTERPRETATION TEXT: This letter is in response to your February 29, 1968, request for approval of equivalent rims for use in the following tire and rim combinations: A. Bias Ply Tires 1. 5.20-13 on 4 1/2J rim. 2. 5.60-13 on 3 1/2J rim. B. Radial Ply Tires 1. 145-13 on 3 1/2J rim. 2. 145-13 on 4 1/2J rim. 3. 185-15 on 4 1/2J rim. On the basis of the supporting information submitted, your request for approval of the equivalent rims and proposed tire combinations listed above is granted. |
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ID: nht68-3.27OpenDATE: 04/24/68 FROM: AUTHOR UNAVAILABLE; R. M. O'Mahoney; NHTSA TO: Fiat Motor Company, Inc. TITLE: FMVSS INTERPRETATION TEXT: This is in reference to your letter of March 21, 1968, concerning Federal Motor Vehicle Safety Standard No. 202. The standard does not preclude the use of a head restraint which, when not in use, can be fully retracted into the seat back. MOTOR COMPANY, INC. March 21, 1968 March 21, 1968 Robert O'Mahoney Federal Highway Administration With reference to Federal Safety standard 202 issued on Federal Register Vol.33 of February 14, 1968, we would appreciate your confirming to us whether a head restraint which, when not in use, can be fully retracted into the seat back is acceptable. Would you please clarify this to us. Thanking you for your cooperation in this matter, we remain, G. Gabrielli Technical Manager |
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ID: nht68-3.28OpenDATE: 04/24/68 FROM: AUTHOR UNAVAILABLE; David A. Fay; NHTSA TO: Schein Body and Equipment Company TITLE: FMVSS INTERPRETATION TEXT: Thank you for your letters of February 29, 1968, to Dr. William Haddon, Jr. concerning the location of lamps and reflectors on your dump semi-trailers and equipment loaders. Initial Motor Vehicle Safety Standard No. 108 requires that the side reflex reflectors be mounted not less than 15 inches nor more than 60 inches above the road surface. To meet this requirement, the front side reflex reflectors on your dump semi-trailers may be mounted below the side rail of the body. If necessary, a protective shield or housing could be provided to prevent the reflector from being damaged by rocks and mud. With respect to the location of rear clearance lamps on your dump semi-trailers, Standard No. 108 requires that these lamps be located as near as practicable to the upper left and right extreme edges of the vehicle, except that optional heights are permitted when the rear identification lamps are mounted at the extreme height of the vehicle. Your photograph does not show identification lamps on the rear of your trailer; however, it does not appear that these lamps could be mounted at the extreme height of the vehicle, since the tail gate is often removed. In this case, the rear clearance lamps must be located as near as practicable to the upper left and right extreme edges of the vehicle. It appears that clearance lamps located immediately forward of the rear post of a point not obscured by the covering tarpaulin would meet this requirement of the standard. A combination clearance and rear side marker lamp at that location would also be permitted by the standard. On your tilt type and roll-back equipment loaders, location of tail, stop, turn signal, and identification lamps 30 inches from the extreme rear of the platform, and location of the rear clearance lamps and rear reflectors 44 inches from the extreme rear of the platform, appear to be in accordance with the location requirements of Standard No. 108. With respect to the requirements of Standard No. 108, I must point out that this Bureau does not issue approvals on items of lighting equipment or on vehicle designs incorporating this equipment. Therefore, the above comments are for your information only and in no way relieve the vehicle manufacturer from his responsibility for certifying that the assembled vehicle meets the requirements of the standard. |
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ID: nht68-3.29OpenDATE: 04/24/68 FROM: AUTHOR UNAVAILABLE; Joseph R. O'Gorman; NHTSA TO: Finderne Engine Co., No. 1, Inc. TITLE: FMVSS INTERPRETATION TEXT: Thank you for your letter of April 8, 1968, to the National Highway Safety Bureau, concerning the applicability of lighting requirements to fire trucks. We agree that the front identification lamps might be slightly obscured while the stationary and rotating red and amber lights are flashing. However, when these lights are not flashing, the identification lights would clearly identify a vehicle that is more than 80 inches in overall width. Therefore, identification lights will be required on your fire truck. The same reasoning can be applied to clearance lights and compliance is also required. The enclosed literature may be of additional assistance to you in response to your inquiry. We trust this information will be of assistance to you in your desire to comply with existing safety standards. |
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ID: nht68-3.3OpenDATE: 12/30/68 FROM: AUTHOR UNAVAILABLE; H. M. Jackson, Jr.; NHTSA TO: General Motors Corporation TITLE: FMVSS INTERPRETATION TEXT: This will acknowledge your letter of October 23, 1968, requesting the addition of the 5-inch alternative rim size for use with the 155-13/6.15-13 tire size designation. In your request you cited a letter from the German Rubber Industry stating that "for passenger car tires in addition to the rims specified in the German Industrial Standards (DIN) also the use of the next large size rims is permissible." The subject of the foot note in the German standard was discussed by my staff in conversations with Mr. Von Polhemus. When the Federal Motor Vehicle Safety Standards were written, it was the intent to accept the German Industrial Standards (DIN) of 1967 for all tire and rim combinations listed based on established usage. We did not intend to apply foot notes from any 1967 reference materials to the present or future tire and rim combinations. However, on the basis of the data submitted indicating compliance with the requirements of Federal Motor Vehicle Safety Standards No. 109 and No. 110 and other information submitted in accordance with the procedural guidelines set forth in the Federal Register, Volume 33, No. 195, page 14969, dated October 5, 1968, the 5J alternative rim size for the 155-13/6.15-13 tire size designation will be listed within Table I of Appendix A to Standard No. 110. This change will be published in the Federal Register in the near future. The addition of this new alternative rim size to the table is accomplished through an abbreviated procedure consisting of the publication in the Federal Register of the petitioned alternative rim size. If no comments are received, the amendment became effective after 30 days from the date of publication. If comments objecting to amendments are received, additional rule making pursuant to Part 216 of the Procedural Rules for Motor Vehicle Safety Standards will be considered. |
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.