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: nht76-1.7OpenDATE: 02/26/76 FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA TO: Alaska Traffic Safety Bureau TITLE: FMVSS INTERPRETATION TEXT: This is in response to a request by Mr. William Hall, National Highway Traffic Safety Administration (NHTSA) Regional Administrator for Region X, for a review of Federal Motor Vehicle Safety Standard No. 104, Windshield Wiping and Washing Systems with special consideration of the comments of Mr. Robertson in his memorandum of November 24, 1975. It is the opinion of this agency that Standard No. 104 is appropriate for the State of Alaska. The essential feature of a wiping system, as far as safety is concerned, is its ability to clear a specific portion of the windshield. The number of wipers necessary to provide the driver with a sufficient field of view is immaterial so long as the minimum percentages of critical areas are washed and wiped. These areas are established in the standard and are determined by the angles from the driver's eye position over which the windshield must be kept clear to provide a proper field of view. While targets of driver attention and environmental conditions may differ from state to state, if the critical areas are clear, the field of view provided to the driver is sufficient. The 1976 Scirocco appears to provide the required field of view. The question therefore becomes whether the Federal standard on windshield wipers is intended to cover all aspects of wiping systems. If so, the situation is analogous to that presented to the court in Motorcycle Industry Council v. Younger, No. CIV S74-126 (E.D.Cal. 1974) which resulted in a holding that Standard No. 108 did preempt an inconsistent state regulation in the field of lighting requirements. The NHTSA has determined that the standard on windshield wiping systems, No. 104, is intended to leave the number of wipers to the discretion of the manufacturers. Under Thorpe v. Housing Authority of Durham, 393 U.S. 268 (1969), and Chrysler v. Tofany, 419 F2d 499, 511-12 (2d Cir, 1969), the interpretation of this question by the administering agency is "of controlling weight unless it is plainly erroneous or inconsistent with the regulation." Thus, a state regulation differing from the standard would impair the Federal superintendence of the field within the meaning of the doctrine set forth in Florida Lime & Avocado Growers v. Paul, 373 U.S. 132, 141-142 (1963) and be preempted under section 103(d) of the National Traffic and Motor Vehicle Safety Act of 1966, U.S.C. 1392(d). |
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ID: nht79-3.2OpenDATE: 09/28/79 FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA TO: L. M. Delgado TITLE: FMVSS INTERPRETATION TEXT: NOA-3O Mr. Lourdes M. Delgado 3000 Kennedy Boulevard Room 307 Jersey City, New Jersey 07306 Dear Mr. Delgado: This responds to your recent letter requesting information concerning Federal and State laws applicable to the manufacture of van seats. The National Highway Traffic Safety Administration issues safety standards and regulations governing the manufacture of motor vehicles and motor vehicle equipment. Safety Standard No. 207, Seating Systems (49 CFR 571.207), specifies performance requirements for seats, their attachment assemblies and their installation to minimize the possibility of seat failure resulting from crash forces. This standard is applicable to seats as installed in vehicles, including vans, but is not applicable to seats as individual pieces of motor vehicle equipment. Therefore, the vehicle manufacturer, not the seat manufacturer, would be responsible for compliance with Standard No. 207. However, under section 151, et seq., of the National Traffic and Motor Vehicle Safety Act, a manufacturer of vehicle seats would be responsible for any safety related defects in his products and would be required to notify owners and remedy the defects. I am enclosinq a copy of Safety Standard No. 207 for your information, as well as an information sheet that explains where you can obtain copies of all our standards and regulations. You will have to contact the individual States in which you are interested to find out if there are any State or local laws applicable to your business. Sincerely, Frank Berndt Chief Counsel
Enclosures 3000 Kennedy Boulevard Room 307 Jersey City, N.J. 07306 August 20, 1979 NHTSA Office of Chief Counsel 400 7th Street, S.W. Washington, D.C. 20590 Gentleman: I am planning to start my own business, manufacturing van seats. I would appreciate if you can send me federal and state laws and regulations conserning the safety for van seats. Please mail to: Lourdes M. Delgado 3000 Kennedy Blvd. Room 307 Jersey City, N.J. 07306 Thank you for your time and cooperation. Sincerely, Lourdes M. Delgado LMD/tr |
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ID: 3232yyOpen Mr. Robert W. Smith Dear Mr. Smith: This responds to your letter of October 14, 1991, to Taylor Vinson of this Office, asking for a confirmation of your interpretation of Motor Vehicle Safety Standard No. 108, based upon a meeting with Mr. Vinson on August 15, l990. You are developing a license plate frame that incorporates a "flashing/steady burning stop lamp", for use on passenger cars and motorcycles, and "an auxiliary flashing/steady burning stop lamp" for use on vans, minivans, and pickup trucks. You cite a letter of this agency to Bettie Lou Simcox, dated October 24, 1986, as authority for your understanding that Standard No. l08 allows the use of a flashing, steady burning stop lamp. Standard No. 108 covers original motor vehicle lighting equipment, and lighting equipment that is intended to replace the original lighting equipment. It does not cover supplementary or novelty lighting equipment offered in the aftermarket. Mrs. Simcox asked us about the acceptability of an aftermarket stop lamp which, when the brake is applied, pulses before going into a steady burning mode. We informed Mrs. Simcox that her lamp was unacceptable as replacement equipment because Standard No. l08 requires original equipment stop lamps, and lamps designed to replace that equipment, to be steady burning in use, but that it would be permissible under Standard No. l08 as a supplementary stop lamp. For the same reason, your invention would not be prohibited by Standard No. l08 if it is offered in the aftermarket as a supplementary stop lamp, which we understand is your intent. You should be aware that Standard No. 108 specifically requires motor vehicles to be equipped with one or more license plate lamps. We are uncertain of the effect, if any, that the installation of your combination license plate frame/supplementary stop lamp would have upon conformance of a vehicle's license plate lamp(s) with the requirements of Standard No. l08. We therefore remind you of the prohibition in the National Traffic and Motor Vehicle Safety Act that a manufacturer, distributor, dealer or motor vehicle repair business may not render inoperative, in whole or in part, a device such as the license plate lamp that has been installed in accordance with a safety standard such as Standard No. 108. Sincerely,
Paul Jackson Rice Chief Counsel ref:108 d:ll/l5/9l |
1970 |
ID: 2799oOpen Mr. Amnon Shomlo Dear Mr. Shomlo: This is in reply to your letter of March 25, 1988, enclosing a "Peace" decal designed to be affixed to the center highmounted stop lamp. The letters and design are in white, printed on transparent plastic, "in an effort to preserve the basic requirements for an effective projected luminous area of the lens and the specified candela." You have asked what "Federal/Legal authorizations we need to obtain, stating that we comply with all the regulations and the requirements regarding this product." There are no regulations that apply directly to the decal, nor any Federal restrictions on its sale. Thus you cannot state in any sales materials that the product meets Federal requirements, for there are none. If a center highmounted brake lamp would continue to meet all applicable requirements of Motor Vehicle Safety Standard No. l08 after installation of your decal, there are no restrictions on its use. Although you intend the product to preserve the requirements of Federal Motor Vehicle Safety Standard No. l08, it is not certain that this will occur. The decal has the potential of obscuring light from some of the l3 test points at distances where candela photometrics must be measured and the specified minima met. However, its actual effect can be determined only through laboratory tests on lamps of different sizes and lens and reflector designs. Although you have no liability under Federal law for selling this decal, a violation of the National Traffic and Motor Vehicle Safety Act will result if the decal creates a noncompliance and if it is applied by a manufacturer, distributor, or dealer before the first sale of the vehicle. A violation will also occur if the decal creates a noncompliance and if it is applied after the vehicle's first sale by any of these persons or by a motor vehicle repair business. There is no violation of Federal law if the decal is applied by a person other than those named above, such as the vehicle owner. In the absence of a violation of Federal law there may nonetheless be State statutes restricting the application of the decal under any circumstances. We are unable to advise you on State laws. I hope that this answers your question. Sincerely,
Erika Z. Jones Chief Counsel ref:l08 d:8/l0/88 |
1970 |
ID: 2883oOpen Gary Evans, President Dear Mr. Evans: This is a response to your letter of February 26, 1988, where you asked the National Highway Traffic Safety Administration (NHTSA) whether a product you wish to import and sell in the United States "complies with any standards which may affect it.". You describe the product as a warning triangle that is designed to be attached to the side window of a car. You tell us that this side-mounted triangle is about 20% smaller than the warning device specified in this agency's regulations in Standard 125, Warning Devices. The answer to your question is that the device you described would not comply with Standard 125. Standard 125 sets uniform specifications for warning devices. Paragraph S3 of Standard 125 states that the standard "applies to devices, without self-contained energy sources, that are designed to be carried in motor vehicles, and used to warn approaching traffic of the presence of a stopped vehicle, except for devices designed to be permanently affixed to the vehicle." By its own terms, then, Standard 125 applies to all warning devices that are not designed to be permanently affixed to the vehicle. You are mistaken in suggesting that because the device attaches to the vehicle, Standard 125 is inapplicable. As I understand your description, the device is not "permanently affixed" to the vehicle. Rather, it is carried in the vehicle, and the vehicle operator may attach or remove the device as necessary. Therefore, this device is subject to the requirements of Standard 125. According to your letter, this device fails to comply with the minimum size requirements set forth in paragraph S5.2.2 of Standard 125. Section 108(a)(1)(A) of the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1397(a)(1)(A)) specifies that, "No person shall ... import into the United States any ... item of motor vehicle equipment manufactured on or after the date any applicable Federal motor vehicle safety standard takes effect unless it is in conformity with such standard..." Standard 125 took effect on January 1, 1974. Thus, Federal law prohibits you from importing any of the devices described in your letter that were manufactured on or after January 1, 1974. I hope you find this information helpful. If you have further questions, please contact Joan Tilghman of my staff at (202) 366-2992. Sincerely,
Erika Z. Jones Chief Counsel ref:125 d:7/18/88 |
1988 |
ID: 77-1.22OpenTYPE: INTERPRETATION-NHTSA DATE: 02/11/77 FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA TO: British Standards Institution TITLE: FMVSR INTERPRETATION TEXT: This responds to the British Standards Institution's December 2, 1976, request to know what constitutes "first purchase of [a new motor vehicle] in good faith for purposes other than resale" as this phrase is used on @ 108(b)(1) of the National Traffic and Motor Vehicle Safety Act (the Act) (15 U.S.C. @ 1397(b)(1) and @ 567.7 of NHTSA regulations (Part 567 -- Certification). You also ask to know the legal basis for any distinction between "original equipment" and "replacement equipment" as those terms are used in regulation of motor vehicles and equipment in the United States. I can confirm your understanding of @ 567.7 of our regulations, as set forth in the statements which you designate as "(a)" and "(b)". With regard to statement "(b)", @ 108 (a)(2)(A) of the Act prohibits, except in the process of repair, a manufacturer, distributor, dealer, or repair business from knowingly rendering inoperative in whole or part, any device or element of design installed in a motor vehicle incompliance with an applicable standard. Thus a dealer could not make the sunroof alteration if he knew that installation rendered inoperative the minimum roof crush capabilities specified by Standard No. 216, Roof Crush Resistance. Your statement designated "(c)" is not necessarily correct. The NHTSA's interpretation of the meaning of "first purchase" relies substantially on the modifier "in good faith." Thus the agency evaluates the circumstances of the purchase with a view to whether or not there is an attempt to circumvent the requirements of law and applicable regulation. For example, when purchasers asked for disconnection of ignition interlock systems by dealers after contracting for the purchase of a vehicle, the agency required that bona fide physical delivery take place without an immediate return of the vehicle to the dealer for disconnection. As a practical matter, the new provision of the Act discussed above (@ 108(a)(1)(A)) prohibits dealer action of this type in the future. Since the 1974 amendments to the Act, there has been a distinction between "original equipment" and "replacement equipment". I have enclosed a copy of our proposal to implement this distinction for purposes of Federal regulation. I believe your question actually addresses the practices of the American Association of Motor Vehicle Administrators. You may wish to contact one or more of those organizations for an answer to your questions. |
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ID: 3043yyOpen Ms. Debby Funk Dear Ms. Funk: This responds to your letter of June 4, l99l, to the Department requesting information regarding regulations on the display of lighted signs in vehicles. If they are not prohibited, you are interested in regulations governing size, placement, color, luminosity, and power source "(i.e. batteries, wire connections to either brake lights or cigarette lighter)." There are no Federal regulations or restrictions that directly prohibit the use of lighted signs in vehicles. However, there may be State and local laws that do. We are not in a position to advise you as to these laws, but you may write the American Association of Motor Vehicle Administrators for an opinion. The address is 4600 Wilson Boulevard, Arlington, Va. 22203. If you are contemplating a commercial venture in supplying lighted signs for use in motor vehicles, there are somewhat different considerations. Under the National Traffic and Motor Vehicle Safety Act, once a vehicle has been sold and in use, a manufacturer, distributor, dealer, or motor vehicle repair business may not modify it in any way that would create a noncompliance with any Federal motor vehicle safety standard with which the vehicle originally complied. Thus, installation of a lighted sign by any of the foregoing persons could affect compliance with Standard No. 111, Rearview Mirrors and Standard No. 108, Lamps, Reflective Devices, and Associated Equipment. If the size of the sign interferes with the field of view in the interior mirror, a mirror must be provided on the exterior of the passenger side (most new cars today come equipped with these mirrors). If the sign is wired to the stop lamps, it must not result in a diminution of power that reduces the light from the lamp below the minimum levels specified in the standard. However, if the device is intended for owner installation, the foregoing discussion does not apply, as the Vehicle Safety Act does not prohibit owners from modifying their vehicles in any manner they choose, even if the modification creates a noncompliance. Our regulations do prohibit combining the center highmounted stop lamp with any other lamp or device such as a lighted display sign. However, there is no Federal prohibition governing manufacture and sale of these devices. If you have further questions, we shall be pleased to respond. Sincerely,
Paul Jackson Rice Chief Counsel ref:l08 d:6/25/9l |
2009 |
ID: nht94-2.58OpenTYPE: Interpretation-NHTSA DATE: April 25, 1994 FROM: John Womack -- Acting Chief Counsel, NHTSA TO: Ken Simons -- Esq. TITLE: None ATTACHMT: Attached to letter dated 6/25/93 from Kenneth P. Simons to Department of Transportation, Trucking Division (OCC-8877) TEXT: This responds to your letter asking about brake requirements for trailers used in tractor trailer combinations. I apologize for the delay in our response. You asked whether all such trailers are required to be equipped with "maxi" brakes on one or both axles. You state that a "maxi" brake is found on all road tractors and "sets the brakes automatically when the air pressure gets down to a minimum level." Please note that the term "maxi" brakes ordinarily refers to spring brakes used in parking and e mergency brake applications. I further note that most, but not all, trailers are equipped with spring brakes. I am pleased to have this opportunity to explain our requirements. By way of background information, under the National Traffic and Motor Vehicle Safety Act ("Safety Act," 15 U.S.C. S1392), the National Highway Traffic Safety Administration (NHTSA) is authorized to issue Federal motor vehicle safety standards applicable to new motor vehicles and items of motor vehicle equipment. NHTSA does not approve vehicles or equipment. Instead, manufacturers are required to certify that their vehicles or equipment meet all applicable standards. Standard No. 121, Air Brake Systems (49 CFR S571.121, copy enclosed), specifies performance requirements for trucks, buses and trailers equipped with air brake systems. The purpose of the standard is to insure safe braking performance of vehicle under n ormal and emergency conditions. While Standard No. 121 does not require manufacturers to use spring brakes or any other particular type of brake system, many manufacturers use spring brakes to comply with the standard's requirements concerning parking brake performance (truck, buses an d trailers; see S5.6), emergency brake performance (trucks and buses only; see S5.7), and trailer pneumatic system failure performance (see S5.8). I note that while the requirements of S5.65 and S5.8 apply to most air-braked trailers, S3 of Standard No. 121 excludes some trailers from all of the standard's requirements. In addition, S5.6 and S5.8 specify alternative requirements for some trailers. I hope this information is helpful. If you have any further questions about NHTSA's safety standards, please feel free to contact Marvin Shaw of my staff at this address or by telephone at (202) 366-2992. |
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ID: nht92-8.39OpenDATE: February 29, 1992 FROM: Allan Schwartz -- President, Tron Industries, Inc. TO: Taylor Vinson -- Legal Counsel, NHTSA TITLE: FMVSS 108 ATTACHMT: Attached to letter dated 4/21/92 from Paul J. Rice to Allan Schwartz (A39; Std. 108) TEXT: We are the manufacturer of LUMITRON, an electronic neon lighting kit for vehicles which is sold and installed as an automotive aftermarket product. Each LUMITRON neon tube is enclosed and sealed in polycarbonate tubing and is energized by a miniature electronic module which is connected to each tube. Our LUMITRON tubes are not like the neon tubes made by local sign shops and used under vehicles. LUMITRON tubes require NO external high voltage (6,000 to 12,000 volt) transformers and NO interconnections of high voltage GTO wires running under the vehicle between the neon display tubes and into the engine compartment. The product described above is legal for street use as long as it is installed below bumper level and under the vehicle. We do NOT manufacture this product for street use in RED, BLUE, YELLOW, and WHITE because they are reserved for Police, Fire and Emergency Services. After speaking with both The Florida Highway Patrol and Mr. Kevin Cavey, N.H.T.S.A., Dept. of Transportation they confirmed our findings that our product falls under 49 CFR Ch. V (10-1-90 Edition) Sec. 571.108. A highlighted copy of this section is enclosed for your convenience to reference. As you can imagine we were delighted to learn that our LUMITRON neon lighting kit, when installed and used as per our instructions, places the user's vehicle into further compliance with S2 Purpose as it illuminates the roadway and enhances the conspicuity of the vehicle thus reducing the possibility of traffic accidents, deaths and injuries. We have been informed by our dealer, Mr. Harry Adcock of All State Audio Services, Inc., 11554 Plank Road, Baton Rouge, LA 70811 that Louisiana and possibly other states have not uniformly adopted or follow the Code of Federal Regulations, 49 CFR Ch. V as it pertains to automotive aftermarket lighting. Authorities in Louisiana believe these products are legal but they have to be approved by the Commissioner. We would be most appreciative if you could write us a letter confirming what we already understand about this regulation that we could submit to the Commissioner. He would then be able to adopt it as Louisiana Law thus making our product legal for use in that State. Thank you for your prompt attention to this matter. |
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ID: nht92-8.47OpenDATE: February 21, 1992 FROM: Masashi Maekawa -- Director, Technical Division, Ichikoh Industries, Ltd. TO: Paul Jackson Rice -- Chief Counsel, NHTSA TITLE: Re: Request for the interpretation of photometric output requirements for tail/stop lamps on passenger cars ATTACHMT: Attached to letter dated 4/10/92 from Paul Jackson Rice to Masashi Maekawa (A39; Std. 108) TEXT: Thank you for your answering letter dated Dec. 18, 1991 to our questions concerning the interpretation of photometer output requirements for tail/stop lamps on passenger cars dated Nov. 27, 1991. We had some questions as follows regarding positions stated in the letter from NHTSA. 1. NHTSA stated in the letter dated Dec. 18, 1991 as follows; " It is not possible to consider the two adjacent lamps as one lamp for purpose of measuring the minimum photometrics required under standard No. 108." But another letter from NHTSA dated June 28, 1985 addressed to Mazda (North America), Inc. stated as follows; " We also discuss the implications of a stop lamp and tail lamp constructed so that a portion is fixed to the body of the vehicle adjacent to the decklid opening and the remaining portion is mounted on the outboard area of the decklid. Compliance of a vehicle is determined with respect to its normal driving position, that is to say, with the tailgate, hatch, or decklid closed." We realized the noticeable difference between those two letters. We have been designing and testing lamps until now according to the interpretation dated June 28, 1985. 2. As the interpretation of the testing method concerning photometer output requirements of lamps mounted onto both the moving vehicle part and the rigid vehicle part is not written in FMVSS No. 108, we have been designing those lamps to comply with photometer output requirements by using both lamps mounted onto the moving vehicle part (Lamp-B) and the rigid vehicle part (Lamp-A), in accordance with the sentence "The device shall be mounted in its normal operating position." of J (Photometry) of SAE J575e incorporated in FMVSS No. 108. For the reason mentioned above, we would like to ask whether your stance concerning the interpretation of those lamps has been changed or not. Kindly let us know your opinion concerning the above matters. |
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.