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: 2776yOpen AIR MAIL Mr. M. Iwase General Manager Technical Administration Department Koito Mfg. Co. Ltd. Shizuoka Works 500, Kitawaki Shimizu-Shi, Shizuoka-Ken Japan Dear Mr. Iwase: This is in response to your letter of November 20, l990 with respect to "interpretation and/or petition" concerning combination headlighting systems. Koito has asked about the permissibility of two or four lamp headlighting systems in which the upper beam would be provided by integral beam headlamps, and the lower beam by replaceable bulb headlamps. The systems you describe would not be permissible under Standard No. l08, which allows only the three types of headlighting systems that you mention. Integral beam headlighting systems must be comprised of integral beam headlamps which, by definition, are headlamps other than sealed beam or replaceable bulb headlamps. Replaceable bulb headlighting systems are those that incorporate the standardized replaceable light sources listed in Standard No. l08. We are transmitting your request to the Office of Rulemaking, for consideration as a petition for rulemaking. Sincerely,
Paul Jackson Rice Chief Counsel ref:108 d:l2/l3/90 |
1970 |
ID: nht94-8.14OpenDATE: February 14, 1994 FROM: Daniel T. Mason -- Product Development Engineer, Automotive Division, Avery Dennison TO: Barbara Gray -- Office of Market Incentives, NHTSA TITLE: None ATTACHMT: Attached to letter dated 4/8/94 from John Womack to Daniel T. Mason (A42; Part 541) TEXT: The purpose of this letter is to ask for a ruling of the footprint requirements of the parts marking legislation, 541-Federal Motor Vehicle Theft Prevention Standard. I am a Product Development Engineer working under Cliff Nastas for Avery Dennison. My question refers to the footprint feature of the label that appears under a UV light in the substrate after the label (illegible words). Both Avery Dennison and (illegible word) supply parts marking labels to the automotive industry. Both have a florescent agent that migrates into the substrate once applied. Would a label that substitutes a florescent copy of the VIN instead of the whole footprint of the label be in compliance to the federal legislation? Please inquire for a ruling on this. I will follow up this letter with a phone call to discuss any questions you may have in the next couple weeks. |
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ID: nht92-7.18OpenDATE: May 5, 1992 FROM: Stephen Newmark TO: Jerry Curry -- NHTSA TITLE: None ATTACHMT: Attached to letter dated 5/27/92 from Frederick H. Grubbe to Phil Gramm (A39; Part 555) TEXT: I have been in contact with Congressman Geron's office concerning the formation of a Texas based company (Lonestar Classics Inc.) which will manufacture kit or reproduction automobile packages. We have been advised that an exemption is available to companies whose production does not exceed 10,000 units during a four year period in so far as Department of transportation safety standards are concerned. Our initial projections are that we would produce approximately 600 such units per year and are hereby requesting said exemption. It is our intent to use this exemption to obtain certificate of origin forms from the State of Texas which would otherwise require proof of our having met the aforementioned standards. We will in any case, make certain that our advertising clearly indicates that such standards have not been met. If you require any additional information, please feel free to contact me at 817-267-6241 or at the address listed below. |
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ID: nht89-2.34OpenTYPE: Interpretation-NHTSA DATE: July 14, 1989 FROM: J. Michael Mundy -- Lease Sales Representative, Penske Truck Leasing Co., L.P. TO: Emory Lariscy TITLE: None ATTACHMT: Attached to letter dated 9-4-90 from P.J. Rice to E.J. Lariscy (A36; Std. 108; Std. 124; Std. 301); Also attached to letter dated 8-28-89 from E.L. Lariscy to G. Shifflett (OCC 3910) with Patent Application for Vehicle Safety Light Assembly (gr aphics omitted); Also attached to letter dated 7-14-89 from J.M. Staples to E.L. Lariscy; Also attached to letter dated 8-8-89 from L. Baer to E.L. Lariscy; Also attached to letter dated 7-28-89 from A.M. Kennedy to E.L. Lariscy TEXT: I recently had the opportunity to witness your speed-caution light in operation. It is a truly effective piece of safety equipment. Rear end collisions are especially prevalent in the transportation industry because of lower speeds required due to weight and product requirements. This light would not only save money in reduced repair cost and lower insurance premiums. More importantly, it may save someone's life. Please forward me any information possible on your product as it becomes available. |
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ID: nht81-1.33OpenDATE: 03/10/81 FROM: FRANK BERNDT -- NHTSA CHIEF COUNSEL TO: DONALD W. VIERIMAA -- DIRECTOR OF ENGINEERING TRUCK TRAILER MANUFACTURERS ASSOCIATION TITLE: NOA-30 ATTACHMT: LETTER DATED 02/09/81 FROM DONALD W. VIERIMAA TO FRANK BERNDT -- NHTSA, EXCLUSION OF THE TOWBAR OF A PERMANENT TRAILER DOLLY FROM THE FMVSS 108 LENGTH CRITERIA; LETTER DATED 04/04/73 FROM RICHARD B. DYSON -- NHTSA TO PAUL K. WILSON TEXT: Dear Mr. Vierimaa: This is to reply to your letter of February 9, 1981 asking for "exclusion of the towbar of a permanent trailer dolly from the FMVSS 108 length criteria." As you indicated, an opinion by this office in 1973 excluded converter dollies and their integral towbar from inclusion in computation of the overall length of trailers (i.e. S4.1.1.3 which excludes intermediate side marker lamps on vehicles less than 30 feet in overall length). Even though a trailer might be manufactured with a permanent dolly, its function is identical to that of a converter dolly and there is no reason to distinguish one from the other for purpose of computation of overall length. Therefore, overall length may be computed exclusive of either the dolly or the tongue. Sincerely, |
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ID: nht95-2.3OpenTYPE: INTERPRETATION-NHTSA DATE: March 14, 1995 FROM: Takashi Adachi -- Manager, Ichikoh Industries, Ltd. TO: Richard L Van Iderstin -- Visibility and Controls Group, Office of Vehicle Safety Standards, NHTSA TITLE: NONE ATTACHMT: ATTACHED TO 5/9/95 LETTER FROM JOHN WOMACK TO TAKASHI ADACHI (A43; STD. 108) TEXT: Dear Mr. Van Iderstein, I am writing this letter to ask you a view with regard to conformity of the reflex reflector included in rear lamp that our company are consider to design. Structure of design are described on the attachment. My questions are related to conformity to FMVSS 108, as follows. 1. Does this structure of the reflex reflector conform to FMVSS 108? 2. Shall the reflex reflector meet the photometric performance requirement in the whole area of the reflex reflector? 3. Or shall each area (upper and lower) of the reflex reflector meet the photometric requirement individually? Thank you in advance, I will call you later to listen your reply. Enclosed: figure 1 (rear of lamp) shows clear and red outer lens, reflex reflector and opaque area. (Figure omitted.) |
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ID: 9161Open Mr. Nicholas S. Copass Dear Mr. Copass: This responds to your letter to Mr. David Elias, formerly of this office, concerning the manufacture of hydraulic brake hose assemblies by Titeflex and Russell Performance Products. I regret the delay in responding. We recently responded to a letter from Mr. Jim Davis of Russell about the labeling of the hose assemblies. I have enclosed a copy of that letter for your information. In that letter, we explain that both Titeflex's and Russell's designations need not be marked on the assembly. Instead, since Russell is manufacturing the assemblies and will market the assemblies, Russell's designation must be marked. The designation will identify Russell as the manufacturer of the assembly in the event of a possible noncompliance or defect with the assembly. I hope this information is helpful. If you have any questions, please do not hesitate to call Ms. Deirdre Fujita of my staff at (202) 366-2992. Sincerely,
John Womack Acting Chief Counsel Enclosure ref:106 d:5/12/94 |
1994 |
ID: nht68-2.29OpenDATE: 11/14/68 FROM: AUTHOR UNAVAILABLE; Charles A. Baker; NHTSA TO: Timmons Metal Products Company TITLE: FMVSS INTERPRETATION TEXT: Thank you for your letter of October 7, 1968, to Dr. William Haddon, Jr., Director, National Highway Safety Bureau, concerning additional side marker lights on tilt cab chassis. In order to meet the requirements of Federal Motor Vehicle Safety Standard No. 108, an amber side marker lamp should be counted on each side of the chasis cab as far forward as practicable. Additional amber side market lamps are not required on the truck body, providing the overall length of the vehicle is less than 30 feet. This is a general clarification only, since we are not sure of the exact configuration of the vehicles in question. A picture or drawing with the necessary overall dimensions would be needed for specific comments. This Burenu does not issue approval on items of lighting equipment of 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 lacks the requirements of standard No. 108. |
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ID: nht89-1.49OpenTYPE: Interpretation-NHTSA DATE: March 22, 1989 FROM: Heracilio R. Prieto -- President, Easton, Inc. TO: Erika Jones -- Chief Counsel, NHTSA TITLE: None ATTACHMT: Attached to letter dated 8-27-90 from P.J. Rice to H.R. Prieto (A36; Std. 116) TEXT: Our company has blended and packaged brake fluids in Puerto Rico for over 10 years. We have always interpreted that the lot number/packaging date must be printed directly on the brake fluid container for us to be in strict compliance under FMVSS 116. Given the aggressiveness of brake fluids on any ink, we have always wished we were allowed to use a label notch coding system which we have used successfully for years in our detergent packaging operation. The relative simplicity of the mechanical devic e, vis-a-vis the jet-ink coder, also makes thc notch system operationally more reliable. The recent revisions in S5.2.2.2 of standard 116 seem oriented to demand indelibility and permanence in the information required on the brake fluid label or container. No ink system could possibly match the notched label on either count. In the spirit of this new approach, I urge you to consider the notch system as an acceptable method of batch/date coding brake fluid bottles. I am attaching copies of the literature from the exclusive supplier of this system for your perusal. I hope you concur with our assessment and look forward to your comments. Please let me know if you need any additional informational from us. Attached is literature entitled Codedge Label Dating Machine (text omitted). |
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ID: nht92-9.21OpenDATE: February 6, 1992 FROM: S. Watanabe -- Manager, Automotive Equipment Legal & Homologation Sect., Stanley Electric Co., Ltd. TO: Administrator, NHTSA TITLE: Re: Marking requirements of FMVSS No. 108 S7.2.(b) ATTACHMT: Attached to letter dated March, 1992 (est.) from Paul Jackson Rice to S. Watanabe (A39; Std. 108) TEXT: As the overseas company of our firm-Stanley Electric Co., Ltd. in Japan, there are Thai Stanley Electric Co., Ltd. in Thailand and Taiwan Stanley Electric Co., Ltd. in Taiwan. We would like to have your advice about the Manufacturer Identification Mark required by FMVSS No. 108 S7.2.(b) on Thai or Taiwan made headlamps for U.S. As the Manufacturer Identification Mark, Thai Stanley Electric Co., Ltd. has "TH STANLEY", "TH STANLEY" (in capital letters) and "STANLEY. TH" (in capital letters), as well as Taiwan Stanley Electric Co., Ltd. has "TW STANLEY", "TW STANLEY" (in capital letters) and "STANLEY. TW" (in capital letters). Can Thai Stanley Electric Co., Ltd. and Taiwan Stanley Electric Co., Ltd. use one of the marks to identify the manufacturer in order to conform the requirements of FMVSS NO. 108 S7.2.(b)? In connection with this matter, we inform you that "TH STANLEY" and "TW STANLEY" have been made an application to the U.S. Patent and Trade Marks Office as a trade mark. However, "TH STANLEY" (in capital letters), "STANLEY. TH" (in capital letters), "TW STANLEY" (in capital letters) and "STANLEY. TW" (in capital letters) are not registered as a trade mark, because we think that they are not a trade mark, but a manufacturer's name. |
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.