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: aiam4136OpenMr. Earl J. Ogletree, Mr. John Gaski, Harley Products Inc., 904 S Prospect Avenue, Park Ridge, IL 60068; Mr. Earl J. Ogletree Mr. John Gaski Harley Products Inc. 904 S Prospect Avenue Park Ridge IL 60068; Dear Mr. Ogletree and Mr. Gaski: Thank you for your letter of March 28, 1986, asking how our regulation would affect a product you intend to manufacture both as an aftermarket item of motor vehicle equipment and as an item of original equipment on some vehicles imported into this country. You described the product as a sun visor that clips onto a vehicle's regular visor. You further explained that the sun visor has an extension arm that allows the visor to be moved to filter out the sun coming in through the window to the left of the driver, or moved below the original equipment visor between the two original equipment visors. I hope the following discussion explains how our regulations affect your proposed visor.; Some background information on how Federal motor vehicle safety law and regulations affect your product may be helpful. Our agency is authorized, under the National Traffic and Motor Vehicle Safety Act, to issue safety standards applicable to new motor vehicles and certain items of motor vehicle equipment. NHTSA, however, does not approve motor vehicles or motor vehicle equipment, nor do we endorse any commercial products. Instead the Vehicle Safety Act establishes a 'self-certification' process under which each manufacturer is responsible for certifying that its products meet all applicable safety standards. The agency periodically tests vehicles and equipment items for compliance with the standards, and also investigates other alleged safety-related defects. As explained below, installation of your proposed sun visor in new and used vehicles would be affected by our regulations. In addition, any manufacturer of motor vehicle equipment is subject to the requirements of the Vehicle Safety Act concerning the recall and remedy of products with noncompliances or defects related to motor vehicle safety.; We have issued Federal Motor Vehicle Safety Standard No. 205, *Glazin Materials*, which specifies performance and location requirements for glazing used in vehicles. These requirements include specifications for minimum levels of light transmittance (70% in areas requisite for driving visibility, which includes all windows in passenger cars).; No manufacturer or dealer is permitted to install solar films and othe sun screen devices, such as the sun visors described in your letter, in *new* vehicles without certifying that the vehicle continues to be in compliance with the light transmittance and other requirements of the standard.; After a vehicle is first sold to a consumer, modifications to a vehicl are affected by section 108(a)(2)(A) of the Vehicle Safety Act. That section prohibits commercial businesses from tampering with safety equipment installed on a vehicle in compliance with our standards. Thus, no dealer, manufacturer, repair business or distributor can install a sun screen device for the owner of the vehicle, if the device would cause the window not to meet the requirements of Standard No. 205. Violation of the 'render inoperative' provision can result in Federal civil penalties of up to $1,000 for each violation.; Section 108(a)(2)(A) does not affect vehicle owners, who may themselve alter their vehicles as they please, so long as they adhere to all State requirements. Under Federal law, the owner may install sun screening devices regardless of whether the installation adversely affects the light transmittance. Individual States govern the operational use of vehicles by their owners and therefore it is within the authority of the States to preclude owners from using sun screens in their vehicles.; If you need further information, please let me know. Sincerely, Erika Z. Jones, Chief Counsel |
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ID: aiam4212OpenMr. Rohit Vaidya, 10288 9th Street Circle, #103, Miami, FL 33172; Mr. Rohit Vaidya 10288 9th Street Circle #103 Miami FL 33172; Dear Mr. Vaidya: This responds to your April 30, 1986 letter concerning Safety Standar No. 213, *Child Restraint Systems*, and your planned built-in child seat. You asked for information concerning all safety standards that would be applicable to the seat and concerning a pending petition for amending Standard No. 213 to permit the installation of built-in child seats in new motor vehicles. I regret the delay in our response.; Standard No. 213 is the only standard which this agency has issue concerning child restraint systems. It was drafted at a time when add-on or portable systems were the only type of child restraint systems. Accordingly, the requirements of the standard are oriented toward that type of system. However, the agency has granted a petition to broaden the standard to permit the installation of built-in child restraint systems. We expect to issue a proposal regarding this matter later this year. Copies of the standard and the petition are enclosed.; As a new manufacturer of motor vehicle equipment, you should know tha a manufacturer has a variety of responsibilities in addition to certifying compliance with all applicable safety standards. Manufacturers have the responsibility to conduct notification and remedy campaigns for safety-related defects or noncompliances with standards in their products. If a child restraint system fails to comply with Standard No. 213 or contains a safety-related defect, the manufacturer may elect to either (1) repair the child restraint so that the defect or noncompliance is removed, or (2) replace the child restraint with an identical or reasonably equivalent restraint which does not have the defect or noncompliance. Whichever of these options is chosen, the child restraint manufacturer must bear the expense for the remedy.; Installation of your product in a used vehicle would also be affecte by the National Traffic and Motor Vehicle Safety Act. Section 108(a)(2)(A) of the Motor Vehicle Safety Act prohibits any manufacturer, distributor, dealer, or motor vehicle repair business from 'rendering inoperative' in whole or in part, any device or element of design installed in a motor vehicle in compliance with an applicable safety standard. Such a rendering inoperative could occur, for example, if the installer of a built-in child safety seat removed the original vehicle seat, installed a replacement vehicle seat containing the built-in child safety seat, but did not ensure that the seat belt anchorages for adult seating positions in the replacement rear seat continued to meet the location and strength requirements of Standard No. 210, *Seat Belt Assembly Anchorages*. A rendering inoperative could also occur if the installer did not ensure that a replacement vehicle seat continued to meet the strength requirements of Standard No. 207, *Seating Systems*, to minimize the possibility of failure by forces acting on that seat as a result of vehicle impact.; Section 108(a)(2)(A) does not establish any limitations on a individual vehicle owner's ability to alter his or her own vehicle. Under Federal law, individual vehicle owners can themselves install any product they want on their vehicles, regardless of whether that product would render inoperative the compliance of the vehicle's seats or seat belt assembly anchorages with the requirements of Standards Nos. 207 or 210. However, the agency encourages vehicle owners not to install products which could lessen the occupant protection afforded by the original seats or safety belt assembly anchorages and thus adversely affect safety.; For further information concerning these responsibilities, pleas consult the enclosed information sheet for new manufacturers.; Sincerely, Erika Z. Jones, Chief Counsel |
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ID: nht92-6.26OpenDATE: May 29, 1992 FROM: Berkley C. Sweet -- Vice-President, School Bus Manufacturers Institute TO: Barry Felrice -- Associate Administrator for Rulemaking, NHTSA TITLE: Subject: Standard No. 222, School Bus Passenger Seating and Crash Protection ATTACHMT: Attached to letter dated 7/28/92 from Paul J. Rice to Berkley C. Sweet (A39; Part 571.3) TEXT: Based on the requirements specified in the Standard No. 222 for Seat Performance Forward, Seat Performance Rearward and the Head Protection Zone, what was the minimum size of the passenger (eight and height) used to establish the design criteria of this standard? Several school districts are now transporting new born and under school-age children with their parents to a school that provides a day-care service, while the parent attends classes. The School Bus Manufacturers Institute has received inquiries as to limits, if any, on passenger size and age that can be safely transported on school bus seats. |
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ID: nht90-4.26OpenTYPE: Interpretation-NHTSA DATE: September 28, 1990 FROM: Takahiro Maeda -- Assistant to the Vice President, Engineering Divison, Yamaha Motor Corporation, U.S.A.; Signature by Michael Schmitt TO: Office of Chief Counsel, NHTSA TITLE: Re FMVSS 108 ATTACHMT: Attached to letter dated 12-7-90 to T. Maeda from P.J. Rice (A36; Std. 108) TEXT: The purpose of this correspondence is to obtain your interpretation of minimum "edge to edge" separation between the tail/stop lamp and turn signals pursuant to FMVSS 108 Table IV. Tail/stop lamp design may feature a housing whereby the bulb reflector subassembly does not extend outward to the edge of the entire assembly. Can "edge to edge" be construed as the edge of the bulb reflector or is it necessarily the outer edge of the en tire tail/stop lamp assembly. Please refer to the attached illustration. We thank you for your insight into this question. Attached illustration. (Graphics omitted) |
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ID: nht94-1.45OpenTYPE: INTERPRETATION-NHTSA DATE: February 7, 1994 FROM: Martin M. Sackoff, Ph.D. -- Executive Director Of Laboratories, International Testing Laboratories TO: Office of Chief Counsil -- NHTSA TITLE: None ATTACHMT: Attached To Letter Dated 5/12/94 From John Womack To Martin Sackoff (A42; Std. 109) TEXT: Gentlemen: The subject of this request is in reference with Motor Vehicle Safety Standard No. 109 - New Pneumatic Tires - Passenger Cars. The specific question is with reference to S4.2.2.4 Tire Strength, which states "S4.2.2.4 Tire Strength. Each tire shall meet the requirements for minimum breaking energy specified in Table 1 when tested in accordance with S5.3". I shall very much appreciate receiving a reply concerning the definition or interpretation of the term "breaking" of the tire. Does this mean a blowout of the tire, or simply the breaking of the tire caused by forcing the steel plunger into the tread? Thank you. Sincerely, |
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ID: nht93-7.14OpenDATE: October 7, 1993 FROM: John Womack -- Acting Chief Counsel, NHTSA TO: Erika Z. Jones -- Esq., Mayer, Brown & Platt TITLE: None ATTACHMT: Attached to letter dated 8/17/93 from Erika Jones to John Womack (OCC-9017) TEXT: This responds to your request for an interpretation of Federal Motor Vehicle Safety Standard No. 213, Child restraint systems. S5.2.3.2(b) of Standard No. 213 specifies a minimum thickness for materials of a certain compression-deflection resistance. You ask whether more than one piece of material may be used to meet the thickness requirement. The answer is yes. S5.2.3.2(b) does not require the material to be of a single piece, and the final rule that incorporated the requirement into Standard No. 213 did not address the issue. 44 FR 72131, December 13, 1979. Accordingly, more than one piece of material may be used. I hope this information is helpful. If you have any further questions, please contact us. |
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ID: nht72-3.46OpenDATE: 03/17/72 FROM: J.E. LEYSATH FOR E.T. DRIVER -- NHTSA TO: U.M. Electrical Distributers Ltd. TITLE: FMVSS INTERPRETATION TEXT: This is in response to your letter of March 6, 1972, concerning warning buzzers for the automobile industry. The National Highway Traffic Safety Administration has issued two safety standards which specify warning requirments. These requirements are given in Paragraph S4.4 of Standard 114 and Paragraph S7.3.1 of Standard 208. A copy of these two standards are enclosed for your review and further information. You will note that these standards do not stipulate minimum requirements for the warning devices, and, at the present time, we have no plans to specify such requirements. The data sheet, however, which you enclosed will be useful to us should we specify such requirements in future amendments to these standards. We appreciate your writing to us, and if we can be of any further service, please let us know. |
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ID: nht74-3.42OpenDATE: 05/14/74 FROM: AUTHOR UNAVAILABLE; R. B. Dyson; NHTSA TO: Dave's Tire & Fuel Oil Corp. TITLE: FMVSS INTERPRETATION TEXT: This is in reply to your letters of March 21 and April 22, 1974, in which you ask whether a tire sold as a "blemish" must be guaranteed for workmanship, material, and road hazards. There are no Federal requirements that manufacturers guarantee blemish (or non-blemish) tires. Such guarantees are within the discretion of each manufacturer. However, Federal Motor Vehicle Safety Standard No. 109 (49 CFR @ 571.109) requires all new passenger car tires to meet minimum safety performance levels for high speed performance, endurance, strength, bead unseating, physical dimensions and tradewear indicators. These requirements apply similarly to both blemish and non-blemish tires. We have enclosed for your information a copy of the Federal Trade Commission's Tire Advertising and Labeling Guides which contain in Guide 11 requirements for the labeling of blemish tires. ENC. |
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ID: 11373JEGOpen B. Michael Korte, Esq. Dear Mr. Korte: This responds to your letter asking about Federal standards concerning the deployment of air bags. You asked whether AFederal regulations establish a minimum speed that vehicles must be traveling, below which an air bag will not deploy.@ The answer to your question is no. Federal Motor Vehicle Safety Standard No. 208, Occupant Crash Protection, establishes a number of performance requirements for air bags and air-bag-equipped vehicles. However, neither that standard nor any other Federal motor vehicle safety standard specifies that air bags must not deploy in crashes below a specified vehicle speed. I hope this information is helpful. If you have any other questions, please contact Edward Glancy of my staff at this address or by phone at (202) 366-2992. Sincerely,
Samuel J. Dubbin Chief Counsel Ref:208 d:1/29/96 NCC-20 Eglancy:mar:1/3/96:OCC 11373 |
1996 |
ID: nht94-9.7OpenTYPE: Interpretation-NHTSA DATE: January 10, 1994 FROM: Adam A. Freund -- Manager, Testing Services, Standards Testing Laboratories, Inc. TO: Walter Myers -- Office of Chief Counsel, NHTSA TITLE: Table II Minimum Static; Breaking Energy (inch pounds) D.O.T. 119 ATTACHMT: Attached to letter dated 4/12/94 from John Womack to Adam A. Freund (A42; Std. 119) TEXT: Further to our telephone conversation of this date, please find enclosed a copy of subject matter for your perusal. As we had discussed I believe there is a typo in the highlighted columns marked respectively MOTORCYCLE and ALL 12 INCH OR SMALLER RIM SIZE. If I am correct the first column MOTORCYCLE should show a plunger diameter of 5/16" and the column marked ALL 12 INCH OR SMALLER RIM SIZE should show a plunger diameter of 3/4". I would appreciate your qualifying my interpretation of above subject matter. If my interpretation is incorrect, please advise me how the respective columns should be marked. Standards Testing Laboratories, Inc. would greatly appreciate any expedited consideration you may allow us on this request.
ATTACHMENT (Table omitted.) |
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.