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 |
|---|---|
ID: aiam3556OpenMr. Wilmer E. Harper, President, Auto Safety House, 2630 W. Buckeye Road, P.O. Box 20643, Phoenix, AZ 85036; Mr. Wilmer E. Harper President Auto Safety House 2630 W. Buckeye Road P.O. Box 20643 Phoenix AZ 85036; Dear Mr. Harper: This responds to your March 25, 1982, letter asking whether an ol school bus body can be mounted on a new chassis if the resulting vehicle would not comply with the safety standards applicable to school buses (Standards 220, 221 and 222). The answer to your question is no.; The agency regards the installation of a new chassis on a school bus a constituting the manufacture of a new school bus. Accordingly, the new school bus would be required to comply with the safety standards in effect on the date of its manufacture. In the case to which you refer, that would include compliance with all of the current school bus safety standards.; Sincerely, Frank Berndt, Chief Counsel |
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ID: aiam1106OpenMr. Shahid R. Khan, Engineer, Flex-N-Gate, 1306 E. University Avenue, Urbana, IL 61801; Mr. Shahid R. Khan Engineer Flex-N-Gate 1306 E. University Avenue Urbana IL 61801; Dear Mr. Khan: In your letter of April 17, 1973 to Mr. Schneider you ask whether th Federal lighting standard, No. 108, applies to you as a manufacturer of rear step-hitch bumpers for pick-up trucks. Since the bumper installation interferes with the original vehicle license plate mounting bracket, provision is made for relocating the license plate in the bumper. You apparently do not yourself mount the bumper to the vehicle, as your letter indicates that they are sold as aftermarket items 'to purchasers of new trucks' and to two truck manufacturers 'who install these items before the trucks are released to the dealers'.; Under the circumstances you describe, Standard No. 108 would not appl to you. Compliance and certification of new vehicles is the responsibility of the truck manufacturers who install the bumpers, although you may have a contractual obligation with them to provide license plate lighting meeting Federal requirements. In the aftermarket, if the bumper is installed prior to delivery of the truck to the purchaser, the dealer making the installation is legally responsible for compliance with Standard No. 108.; Yours truly, Richard B. Dyson, Assistant Chief Counsel |
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ID: aiam0989OpenMr. Orin D. Miner, P.O. Box 138, Palmyra, Wisconsin 53156; Mr. Orin D. Miner P.O. Box 138 Palmyra Wisconsin 53156; Dear Mr. Miner: Contact 6 of Milwaukee, Wisconsin has sent us a copy of your lette asking that we respond to your questions.; In your letter you inquire as to the distribution of fines collecte from tire manufacturers as a result of their manufacturing tires that do not comply with the requirements of the Federal standard for passenger car tires (Standard No. 109).; Monies collected as settlement offers are transmitted to the genera funds of the United States Treasury.; The Federal Motor Vehicle Safety Standard, including the passenger ca tire standard, are minimum standards vehicle manufacturers and equipment manufacturers are required to meet. They are issued to give assurance that if the product in question meets the standards the public will have some protection against unreasonable risk of death or injury.; In addition to the question of civil penalties, manufacturers o non-conforming vehicles or tires are usually required to issue a defect notification and are urged to replace the defective equipment. Your complaint does not appear to be concerned with a safety related problem but rather with tires that you believe have not given you adequate treadwear. This is not area covered by existing standards, however, this agency has under consideration a quality grading regulation which would include grading requirements for the treadwear life of each tire manufactured after a given date.; Concerning your recommendation that Federal inspectors be placed i tire manufacturers' plants, has been considered at various times and the agency's present thinking is that the cost and manpower involved would not warrant this course of action.; Thank you for your interest in auto safety and your view in this area. Sincerely, Lawrence R. Schneider, Chief Counsel |
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ID: aiam2568OpenHonorable John W. Wydler, House of Representatives, Washington, DC 20515; Honorable John W. Wydler House of Representatives Washington DC 20515; Dear Mr. Wydler: Thank you for your letter of April 21, 1977, requesting informatio concerning Federal regulations regarding school bus safety on behalf of your constituent, Mrs. Peter Peugeot of Rockville Centre, New York.; I have enclosed a document, 'Summary Description of Motor Vehicl Safety Standards Applicable to Buses,' which should be helpful to Mrs. Peugeot. I have also enclosed an information summary, 'Where to Obtain Motor Vehicle Safety Standards and Regulations,' along with a set of forms from our Technical Reference Branch indicating how specific information may be retrieved through computer assisted literature searches along with an outline of fees for this service.; In addition to the above material, I have enclosed an order form fo the entire set of Federal motor vehicle safety standards and regulations, in case Mrs. Peugeot desires this specific volume. I would call her attention to the fact that although this document is relatively expensive, it is furnished in looseleaf form and is updated periodically for an indefinite period with the latest amendments and changes at no additional cost.; I trust this information and material will be of value to Mrs. Peugeot If I can be of further assistance, please do not hesitate to contact me.; Sincerely, Robert L. Carter, Associate Administrator, Motor Vehicl Programs; |
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ID: aiam3995OpenMr. Leo Kagan, Director of Marketing, Automotive Division, Amco Manufacturing Corporation, 7425 Fulton Avenue, North Hollywood, CA 91605; Mr. Leo Kagan Director of Marketing Automotive Division Amco Manufacturing Corporation 7425 Fulton Avenue North Hollywood CA 91605; Dear Mr. Kagan: This is in reply to your letter of July 19, 1985, asking if deck-mounted rack loaded with luggage would cause a violation of the center high-mounted stop lamp provisions of Motor Vehicle Safety Standard No. 108.; The answer is no. Compliance with Standard No. 108 is determine independent of whether the luggage rack is loaded. However, if the rack is installed before sale of the vehicle to its first purchaser, or if it is installed after sale by a person other than the vehicle owner, care must be taken to insure that the photometric and visibility requirements for center high-mounted stop lamps continue to be met with the unloaded rack in place.; The lamp is intended to reduce the incidence of rear end collisions Loading the rack in a manner that obscures the light will reduce the safety benefits that the lamp provides both the driver of the car, and of any vehicle that follows, and is a practice that should be discouraged.; If you have any further questions, we shall be happy to answer them. Sincerely, Jeffrey R. Miller, Chief Counsel |
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ID: aiam2567OpenHonorable John W. Wydler, House of Representatives, Washington, DC 20515; Honorable John W. Wydler House of Representatives Washington DC 20515; Dear Mr. Wydler: Thank you for your letter of April 21, 1977, requesting informatio concerning Federal regulations regarding school bus safety on behalf on your constituent, Mrs. Peter Peugeot of Rockville Centre, New York.; I have enclosed a document, 'Summary Description of Motor Vehicl Safety Standards Applicable to Buses,' which should be helpful to Mrs. Peugeot. I have also enclosed an information summary, 'Where to Obtain Motor Vehicle Safety Standards and Regulations,' along with a set of forms from our Technical Reference Branch indicating how specific information may be retrieved through computer assisted literature searches along with an outline of fees for this service.; In addition to the above material, I have enclosed an order form fo the entire set of Federal motor vehicle safety standards and regulations, in case Mrs. Peugeot desires this specific volume. I would call her attention to the fact that although this document is relatively expensive, it is furnished in looseleaf form and is updated periodically for an indefinite period with the latest amendments and changes at no additional cost.; I trust this information and material will be of value to Mrs. Peugeot If I can be of further assistance, please do not hesitate to contact me.; Sincerely, Robert L. Carter, Associate Administrator, Motor Vehicl Programs; |
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ID: aiam2569OpenHonorable John W. Wydler, House of Representatives, Washington, DC 20515; Honorable John W. Wydler House of Representatives Washington DC 20515; Dear Mr. Wydler: Thank you for your letter of April 21, 1977, requesting informatio concerning Federal regulations regarding school bus safety on behalf of your constituent, Mrs. Peter Peugeot of Rockville Centre, New York.; I have enclosed a document, 'Summary Description of Motor Vehicl Safety Standards Applicable to Buses,' which should be helpful to Mrs. Peugeot. I have also enclosed an informational summary, 'Where to Obtain Motor Vehicle Safety Standards and Regulations,' along with a set of forms from our Technical Reference Branch indicating how specific information may be retrieved through computer assisted literature searches along with an outline of fees for this service.; In addition to the above material, I have enclosed an order form fo the entire set of Federal motor vehicle safety standards and regulations, in case Mrs. Peugeot desires this specific volume. I would call her attention to the fact that although this document is relatively expensive, it is furnished in loose-leaf form and is updated periodically for an indefinite period with the latest amendments and changes at no additional cost.; I trust this information and material will be of value to Mrs. Peugeot If I can be of further assistance, please do not hesitate to contact me.; Sincerely, Robert L. Carter, Associate Administrator, Motor Vehicl Programs; |
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ID: aiam3780OpenB.E. Diehl, Captain, Commander, A.S.E.D., Maryland State Police, 6601 Ritchie Highway, Glen Burnie, MD 21062; B.E. Diehl Captain Commander A.S.E.D. Maryland State Police 6601 Ritchie Highway Glen Burnie MD 21062; Dear Captain Diehl: This responds to your letter of November 11, 1983, asking thre questions about the use of sun screening devices on vehicle glazing materials. The answers to your questions are as follows:; 1. The interpretations of Standard No. 205, *Glazing materials*, state in this agency's letters to the State of Hawaii concerning the use of sun screening device on vehicle glazing materials will be uniformly applied by the agency from State-to-State. If you are aware of vehicle manufacturers, distributors, dealers or motor vehicle repair shops that are in violation of those interpretations, please provide that information to our Office of Vehicle Safety Compliance.; 2. Section 108(a)(2)(A) of the National Traffic and Motor Vehicl Safety Act prohibits motor vehicle manufacturers, distributors, dealers and motor vehicle repair shops from knowingly rendering inoperative any device or element of design installed in compliance with a Federal motor vehicle safety standard. Standard No. 205 sets performance requirements for all glazing materials used in motor vehicles. Those performance requirements may vary depending on where in the vehicle the glazing is used. For example, only glazing materials used at levels requisite for driving visibility must comply with the luminous transmittance requirements.; 3. Standard No. 205 specifies abrasion resistance requirements fo glazing materials. Therefore, the use of solar screening materials, which do not meet the abrasion requirements of the standard, would render inoperative the glazing materials compliance with the standard.; If you have any further questions, please let me know. Sincerely, Frank Berndt, Chief Counsel |
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ID: aiam3812OpenMr. H. Nakaya, Office Manager, Mazda (North America), Inc., Detroit Office, 23777 Grenfield (sic) Road, Suite 462, Southfield, MI 48075; Mr. H. Nakaya Office Manager Mazda (North America) Inc. Detroit Office 23777 Grenfield (sic) Road Suite 462 Southfield MI 48075; Dear Mr. Nakaya: This responds to your letter requesting an interpretation of Standar No. 120, *Tire Selection and Rims for Motor Vehicles Other Than Passenger Cars* (49 CFR S571.120). Specifically, you noted that section S5.2 of that standard required that certain information be labeled on the 'weather side' of each rim or wheel disc. You then offered your interpretation of the term 'weather side', and asked for my comments on that interpretation. My comment is that Standard No. 120 explicitly defines 'weather side', and that the definition of the term in Standard No. 120 is somewhat broader than your interpretation of the term.; Section S4 of Standard No. 120 contains the following definition 'Weather side' means the surface area of the rim not covered by the inflated tire. The interpretation you offered in your letter was consistent with this definition, because it would require that the information not be labeled in an area where it would be obscured by the inflated tire. However, your interpretation would also require that the information not be labeled in an area where it would be obscured by any axle mounting components, and this requirement is not contained in the definition set forth in Standard No. 120. You are free to use your narrower interpretation for your own purposes since it is consistent with the definition in the Standard, but the definition set forth in the Standard would be used to determine whether a rim complies with the requirements of the Standard.; Please feel free to contact me should you have any further questions o need more information on the requirements of Standard No. 120.; Sincerely, Frank Berndt, Chief Counsel |
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ID: aiam2890OpenMr. Michael Pinto, Burke & Burke, 30 Rockefeller Plaza, New York, NY 10020; Mr. Michael Pinto Burke & Burke 30 Rockefeller Plaza New York NY 10020; Dear Mr. Pinto: This is in response to your letter of October 25, 1978, requestin approval of the tread labels Atlas Supply Company proposes to use in satisfaction of the labeling requirements of the Uniform Tire Quality Grading Standards (UTQGS) (49 CFR 575.104(d)(1)(i)(B)). You propose to include the applicable UTQGS grades for a particular tire on a tread label identifying the tire brand, type and size. All possible traction and temperature grades would be depicted with the grades applicable to the specific tire indelibly circled. A separate label would contain the general grading information from Figure 2 of the rule.; Part 575.104(d)(1)(i)(B) requires that each passenger car replacemen tire, other than a snow tire or temporary use spare tire, have affixed a tread label containing both the specific UTQGS grades for the tire and an explanation of the grades in the form illustrated in Figure 2. While the National Highway Traffic Safety Administration (NHTSA) has no objection to the inclusion of the required UTQGS information on the same label with other data such as tire size and brand name, failure to provide the required explanations on the same label with the applicable tire grades is not permitted by the regulation.; While Atlas' proposed tread labels do not meet the present requirement of Part 575.104(d)(1)(i)(B), NHTSA now has under consideration a petition for rulemaking requesting amendment of the UTQG regulation to permit greater flexibility in tread labeling.; Sincerely, Joseph J. Levin, Jr., Chief Counsel |
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.