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: nht93-3.9OpenDATE: April 20, 1993 FROM: Henry Murillo TO: Z. Taylor Vinson -- Office of Chief Counsel, NHTSA TITLE: Re: Green Light System ATTACHMT: Attached to letter dated 6-28-93 from John Womack to Henry Murillo (A41; Std. 108). TEXT: I respectfully ask for an interpretation of the rules concerning new automotive products and specifically regarding my invention entitled "Green Light System". Summary: Two strips of green plastic which are illuminated from behind. One strip is mounted somewhere in the front of the car and the other possibly on top of the cyclops (rear top dash mounted brake light). Purpose: The object is to indicate to a vehicle either in front or behind you that it is safe to pass. All you do is hit the button which could start the unit flashing. Please write your reply to: Henry Murillo 140 Patchogue Ave. Mastic, NY 11950 |
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ID: nht93-4.1OpenDATE: May 18, 1993 FROM: John Womack -- Acting Chief Counsel, U.S. Department of Transportation, NHTSA TO: George D. James, Jr. -- Safety Chairman, Unit 169 WBCCI TITLE: None ATTACHMT: Attached to letter dated 12-8-92 from George D. James, Jr. to Paul Jackson Rice (OCC 8094) TEXT: This responds to your letter of December 8, 1992, to Paul Jackson Rice, former Chief Counsel of this agency, with respect to the Tekonsha electronic brake control. After having reviewed Mr. Rice's letter of December 4, 1992, you "still believe that using trailer brakes without activating the STOP LIGHTS is an unsafe procedure . . . ." The purpose of the Tekonsha device is to control sway of the trailer by light application of the trailer brakes, and not to indicate that the trailer is slowing or stopping. Thus, activation of the trailer stop lamps when the Tekonsha device in use would be inappropriate. However, when the operator does intend to slow or stop, (s)he depresses the brake pedal (foot) which applies the brakes to both the trailer vehicle and the one that is towing it. At this point, the stop lamps are properly activated. I hope that this explains the matter to you. |
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ID: nht93-4.10Open
DATE: May 24, 1993 FROM: John Womack -- Acting Chief Counsel, U.S. Department of Transportation, NHTSA TO: Steve Flint -- Century Products Co. TITLE: None ATTACHMT: Attached to fax transmission dated 1-28-93 from Steve Flint to Dee Fujita TEXT: This responds to your question about the registration form required by S5.8 of Standard 213, "Child Restraint Systems." In telephone conversations with Deirdre Fujita of my staff, you indicated that your registration form would have certain characteristics. The form would be identical to the ones shown in figures 9a and 9b of Standard 213 and required by S5.8 of the standard, except that cards bearing additional information would be attached to it. The additional information consists of French and Spanish translations of the instructions shown in Figure 9a for filling out the registration form, and a French version of the registration form shown in Figure 9b. You stated that the Spanish instructions are for the Spanish speaking population in the U.S. You also said that the French form is required by Canada for restraints sold there, and that attaching it to the U.S. (English) form facilitates your compliance with both U.S. and Canadian standards. We conclude that as long as the English form complies with S5.8 and does not bear any information or writing beyond that required to be on the form, cards bearing the French and Spanish information may be attached to the English form if the information on those cards is presented in a manner that is not likely to confuse consumers in this country about the meaning of the English form or the importance of owner registration. As to whether the additional information is likely to cause confusion, we note the additional information consists solely of French and Spanish translations of the information on the English form. We note further that you indicated to Ms. Fujita that significant numbers of your consumers have been filling in and mailing the tri-lingual registration cards. This return rate indicates that the additional information has not confused the consumers. We appreciate your recognition of the differing language needs of your customers. NHTSA has suggested to manufacturers that they should consider providing consumer instructions on the use of child restraints not only in English, but also in other languages, to address a possible need for such information. (See, denial of petition for rulemaking from Mr. Mattox, 55 FR 48262, November 20, 1990.) Please note, however, that NHTSA wishes to maximize the return rates for the registration forms. If information arises that indicates the French and Spanish information is confusing consumers or otherwise negatively affecting return rates, the agency will reconsider whether such information should be permitted. I hope this information is helpful. Please call Ms. Fujita at (202) 366-2992 if you have further questions. |
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ID: nht93-4.11OpenDATE: May 28, 1993 FROM: John Womack -- Acting Chief Counsel, U.S. Department of Transportation, NHTSA TO: Thomas Luckemeyer -- SWF Auto-Electric Guild GmbH TITLE: None ATTACHMT: Attached to letter dated 4-28-93 from Thomas Luckemeyer to Taylor Vinson (OCC 8589) TEXT: As you have requested, we are responding by FAX to your letter of April 28, 1993, to Taylor Vinson of this Office. You have asked two questions with respect to the acceptability of a multiple rear turn signal lamp under Federal Motor Vehicle Safety Standard No. 108, and have enclosed a sketch of the lamp. Your first question is: "Is it allowed to split the turn signal lamp in two parts with the dimensions given in the sketch . . . where the bigger part (4.5 sq. in.) is on the body of the car. The distance does not exceed 22 in." Your question indicates that the turn signal lamp array of two lamps that is illustrated in the sketch is intended for installation on passenger cars or other vehicles whose overall width is less than 80 inches. Standard No. 108 incorporates by reference the SAE standard applicable to such vehicles, J588 NOV84. Paragraph 5.1.5.2 of SAE J588 NOV84 permits the use of multiple rear turn signal lamps to meet the photometric requirements of Standard No. 108. When multiple lamps are used to meet the photometric requirements of a rear turn signal lamp, paragraph 5.3.3 of SAE J588 NOV84 requires that the functional lighted lens area of each lamp shall be at least 22 sq. cm, provided the combined area is at least 37.5 sq. cm. Your sketch shows that the functional lighted lens area of one lamp is 23 sq. cm, and of the other, 30 sq. cm, with a combined area of 53 sq. cm. Therefore, Standard No. 108 permits you to use the turn signal lamp array shown in your sketch. Your second question is: "Is it allowed to use the combination of the two lamps to meet the photometric requirements." Because the distance between the two adjacent light sources in the array does not exceed 560 mm (the sketch indicates that it is less than 550 mm), paragraph 5.1.5.2 of SAE J588 NOV84 requires that the combination of the lamps be used to meet the photometric requirements for the corresponding number of lighted sections, two in this case. |
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ID: nht93-4.12OpenDATE: May 28, 1993 FROM: John Womack -- Acting Chief Counsel, U.S. Department of Transportation, NHTSA TO: Steve Reeder -- President & General Manager, Trails West Manufacturing TITLE: None ATTACHMT: Attached to letter dated 4-21-93 from Steve Reeder to Taylor Vinson (OCC 8601) TEXT: This responds to your letter of April 21, 1993, to Taylor Vinson of this Office, in which you ask questions about the applicability of Federal Motor Vehicle Safety Standard No. 108 to the livestock trailers that you manufacture. The trailer box is 78 inches wide, but the overall vehicle width exceeds 80 inches when the fenders are added. You have asked whether such trailers must be equipped with lamps required of vehicles whose overall width is 80 inches or more (clearance and identification lamps) as they will be installed on the trailer box. In an interpretation published in 1976 which remains valid today, the agency stated that "overall width" refers to "the nominal design dimension of the widest part of the vehicle . . . exclusive of flexible fender extensions, and mud flaps . . . ." The trailers you manufacture do not appear to be equipped with "flexible fender extensions", according to the literature that you supplied, and therefore the fenders would be included in determining the overall width. Accordingly, they would be required to be equipped with clearance and identification lamps. Although the clearance lamps will be located on the box, they should be placed, as nearly as possible, to indicate the overall width of the vehicle and as near the top as practicable, as Table II of Standard No. 108 requires. Thus, to answer your second question, side marker lamps would be located as required by Table II rather than Table IV. In determining whether the overall length of the trailer is 30 feet or more for purposes of installation of intermediate side marker lamps and reflectors, you ask whether "the gooseneck or 5th wheel portion of the trailer which extends over the tow vehicle" should be included. The agency has not adopted a definition of "overall length." However, with respect to a trailer that is less than 6 feet in overall length, paragraph S5.1.1.15 requires that "the trailer tongue" be included in the measurement. Therefore we believe that the calculation of overall length for longer trailers should also include the trailer tongue or equivalent connector to the towing vehicle. You have also asked if "front clearance lights (would) be required where the gooseneck or 5th wheel portion of the trailer extends over the tow vehicle." The answer is yes. Table II of Standard No. 108 requires that amber clearance lamps be located "on the front" and as near the top as practicable, which we interpret to be the foremost, highest part of the trailer. Your final question relates to regulations for "safety chains" for your products. We are unaware of any Federal requirements that apply to this item of equipment. States may have adopted specifications such as VESC Regulation V5, or SAE Recommended Practice J697 MAY88, which would apply to vehicles operated within their borders. However, we are unable to advise you on State laws, and suggest that you contact, for an opinion, the American Association of Motor Vehicle Administrators (AAMVA), 4600 Wilson Boulevard, Arlington, Va. 22203. |
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ID: nht93-4.13OpenDATE: May 28, 1993 FROM: Richard J. Dessert -- Proprietor, Sun Cycle Company TO: Administrator -- NHTSA TITLE: None ATTACHMT: Attached to letter dated 1/11/94 from John Womack to Richard J. Dessert (A42; Part 555) and letter dated 5/7/93 from John W. Schumann TEXT: I, Richard Dessert, as owner of Sun Cycle Company, a sole proprietorship organized within the State of California, hereby petition the National Highway Traffic Safety Administration (NHTSA) for a temporary exemption from the safety standards of the National Traffic and Motor Vehicle Safety Act of 1966 for a period of two years to facilitate the development of new motor vehicle low emission engine features. It is the intent of Sun Cycle Company to produce electric vehicles (EVs) that will comply with all NHTSA safety standards including those which are scheduled to take effect in 1995. Further, it is the belief of Sun Cycle Company that the first prototype production vehicles to be produced by Sun Cycle Company would substantially comply with all the safety standards for motor vehicles as required by NHTSA. The basis for this petition for temporary exemption is the development and field evaluation of a low-emission motor vehicle. Sun Cycle Company will manufacture electric vehicles which it believes will comply with all emission standards of the Clean Air Act and thus would be considered a low-emission vehicle. (The Sun Cycle electric vehicles would be classified as zero-emission vehicles as defined by the California Air Resources Board.) It is the intent of Sun Cycle Company to subject the electric vehicles to testing that would lead to substantiation for certification to the safety standards of NHTSA. It is the intent of Sun Cycle Company to produce a limited number of electric vehicles for purchase by the Los Angeles Department of Water and Power (LADWP) if a mutually agreed upon purchase contract is signed between Sun Cycle Company and LADWP. Documentation of a Request for Proposals for Acquisition of Electric Vehicles (RFP) from qualified and successful bidders (dated May 5, 1993) is attached to this letter as Attachment A. As part of LADWP requirements for successful bidders, evidence of progress towards obtaining Federal Motor Vehicle Safety Standards certification may be provided through demonstration that an application was made with NHTSA for a temporary exemption from Federal Motor Vehicle Safety Standards. LADWP states on page 4 of their RFP that it intends among other uses to use the purchased electric vehicles (Evs) to assess and promote ongoing advancements in EV technology. At the end of the exemption period it is the intent of Sun Cycle to produce electric vehicles which conform to all safety standards of the NHTSA. Sun Cycle Company will not sell more than 2,500 exempted vehicles in the United States in any 12 month period if granted a temporary exemption by NHTSA. If you should have further questions regarding this petition for temporary exemption, please direct them to me at the address and telephone indicated on this letter. |
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ID: nht93-4.14OpenDATE: June 2, 1993 FROM: John Womack -- Acting Chief Counsel, U.S. Department of Transportation, NHTSA TO: Vincent Schulze -- Chief, Motor Carrier Inspection and Investigation, State of New Jersey, Department of Transportation TITLE: None ATTACHMT: Attached to letter dated 2-26-93 from Vincent Schulze to Ron Havelar. TEXT: This responds to your February 26, 1993 letter to Mr. Ron Havelar of the Federal Highway Administration. Because your question concerns a safety standard issued by the National Highway Traffic Safety Administration (NHTSA), it has been referred to my office for reply. You ask whether a bus can comply with the requirements of Standard No. 217, BUS WINDOW RETENTION AND RELEASE, particularly S5.4, if it is equipped with side exit windows which slide open. NHTSA's longstanding position is that sliding windows are not prohibited by Standard No. 217, as long as they comply with all of the standard's requirements. The requirement in S5.4 that the emergency exit must be "manually extendable" refers to the ability to open the exit manually, i.e., even when the bus's power is off. Sliding windows must also be capable of complying when the window is in either the opened or the closed position. While sliding windows are not prohibited, NHTSA believes it is difficult for sliding windows to comply with the requirements of Standard No. 217. For example, S5.3 of Standard No. 217 specifies release requirements for emergency exits. Section S5.3.2 states, in part, The release mechanism or mechanisms shall require for release one or two force applications, at least one of which differs by a 90 degrees to 180 degrees from the direction of the initial push-out motion of the emergency exit (outward and perpendicular to the exit surface). Thus it appears that the initial motion to open an exit window must be outward and perpendicular to the exit surface, even if it is a sliding window. You should be aware that on February 25, 1992, the Blue Bird Body Company petitioned the agency to amend Standard No. 217. One issue raised by this petition is the installation of sliding exit windows. This petition has been granted and the agency is proceeding with rulemaking on this issue. I hope you find this information 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: nht93-4.15OpenDATE: June 2, 1993 FROM: Eddie Bernice Johnson -- Member of Congress, 30th District Texas, U.S. House of Representatives TO: Art Neill -- Division Chief, Office of Vehicle Safety Standards, NHTSA TITLE: None ATTACHMT: Attached to letter dated 6-28-93 from John Womack to Eddie Bernice Johnson (A41; Part 571). TEXT: Dr. Way recently contacted my office concerning the resale of military vehicles for civilian use. The enclosed letter from Dr. Way should more clearly state issue. I would appreciate having the benefit of your review and consideration of Dr. Way's request so that I might better prepare a response. Please respond to my Dallas office at the District address above, where this case has been assigned to my staff assistant, Scott Rule. Thank you for your attention in this matter.
April 29, 1993
Congressman Martin Frost 400 S. Zang Dallas, TX 75208 Dear Congressman: As a concerned citizen of Dallas, Texas, I want to inform you of something I have been alerted to. I called to find out about the purchase of used military jeeps for possible use as a vehicle on my ranch. We would use this vehicle as an off-the-road vehicle and occasionally as a vehicle to travel back and forth to town. Upon contacting the Department of Defense at 800-222-3767, which is a recorded message describing the Department of Defense surplus sales, it states that the military jeep M-151 is a type of vehicle that for some reason the Department o+ Transportation has deemed unsafe to be used on public roads. Therefore, the military vehicles are not sold, but are destroyed by crushing. I called Carswell AFB and asked the surplus sales department there about sale of the jeeps. They gave me the same information, that they do not sell military Jeeps, and they are destroyed for safety reasons. I find this very unusual, because if they are found to be unsafe on our roads, how can we consider these vehicles safe for use by military personnel? I was in the military and rode in these vehicles on and off the road, and they were very safe depending on who was driving.
I would like you to investigate this situation, because I feel this is another waste of materials by the government. These vehicles could be sold and used by civilians after they have completed their military use. I think this is a situation that needs to be rectified. Sincerely yours,
Bill V. Way, D.O. Concerned Citizen |
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ID: nht93-4.16OpenDATE: June 3, 1993 FROM: John Womack -- Acting Chief Counsel, U.S. Department of Transportation, NHTSA TO: Berkley C. Sweet -- Executive Vice President, School Bus Manufacturers Institute TITLE: None ATTACHMT: Attached to letter dated 3-2-93 from Berkley C. Sweet to Mary Versailles (OCC 8393); Also attached to letter dated 3-20-90 from Stephen P. Wood to Cadwallader Jones (A35; VSA 102(14); Part 571.3) TEXT: This responds to your letter requesting definitions of primary, preprimary, and secondary school students. You write in response to our July 28, 1992 letter to you in which we state that the National Traffic and Motor Vehicle Safety Act, 15 U.S.C. S1581, et seq. (Safety Act), defines a school bus as a vehicle that is "likely to be significantly used for the purposes of transporting PRIMARY, PREPRIMARY, or SECONDARY school students to or from such schools or events related to such schools" (emphasis added). The terms primary, preprimary, and secondary school are not defined in the Safety Act or in the legislative history of the Act. However, NHTSA has historically interpreted "preprimary school" to refer to kindergarten, nursery schools and Head Start facilities. "Primary school" refers to elementary school, and "secondary school" refers to high school. I have enclosed a copy of our March 20, 1990 letter to Mr. Cadwallader Jones that discusses whether various institutions (e.g., church schools and colleges) are considered "schools" under the Safety Act. The various states may have their own definitions of a "school" for determining the use requirements for school vehicles. Therefore, you should check with the state where questions of school vehicle use are at issue. I hope the above information will be of assistance to you. If you have any further questions regarding this matter, please feel free to contact Walter Myers of my staff at this address or at (202) 366-2992. |
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ID: nht93-4.17OpenDATE: June 3, 1993 FROM: Michael H. Dunn -- Vice President, Marketing, Micho Industries TO: Greg Fera -- Pupil Transportation Specialist, Department of Education, Bureau of Pupil Transportation COPYEE: M. Hecker; J. Heritscko; G. Gruber TITLE: Re: R-Bar Passenger Restraint System ATTACHMT: Attached to letter dated 6-29-93 from John Womack to Michael H. Dunn (A41; Std. 222); Also attached to letter dated 11-29-91 from Paul Jackson Rice to Michael H. Dunn; Also attached to letter dated 12-3-91 from Michael H. Dunn to Paul Jackson Rice. TEXT: To confirm our recent telephone conversation, Micho Industries is now making the arrangements to complete the testing of the R-Bar, with the latest modifications, for compliance with FMVSS 222, specifically for rear impact (4" clearance) requirements. This testing should put to rest the only remaining concern about the safety of the R-Bar and its compliance with all applicable Federal standards, since all other aspects of those regulations have previously been tested and "certified" to meet those requirements. We hope to have the complete test data package very soon and I will forward a copy to you immediately for evaluation. In the meantime, please don't hesitate to call me if you have any questions.
May 17, l993
Mr. Greg Fera, Pupil Transportation Specialist Department of Education Bureau of Pupil Transportation, CN-500 225 W. State Street Trenton, NJ 08625-0500 Re: R-Bar Passenger Restraint System Dear Greg: To confirm our telephone conversation, I wish to advise you that, due to several improvements made in the R-Bar design, we can not "CERTIFY" that it is in full compliance with all requirements of FMVSS No. 222, including the rear impact tests described in S5.1.4(c) of that regulation. Please advise Linda Wells for me and, if either of you have any questions, please let me know. As you know, it is the responsibility of the manufacturer of a product to provide that certification and Micho Industries can now offer you that assurance.
While details of specific changes will not be made public for awhile, I wanted you to be one of the first to be aware of the fact that we can now offer the R-Bar for sale in New Jersey and other states that are looking for a practical and safe alternative to seat belts for school buses. Thanks for your patience with us. I am sorry it took to so long to get here. Regards,
Michael H. Dunn V.P. Marketing MHD/md CC: M. Hecker, J. Heritscko, G. Gruber |
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.