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: nht92-1.16OpenDATE: 12/18/92 FROM: CHRISTOPHER J. DANIELS -- NELSON, MULLINS, RILEY & SCARBOROUGH TO: PAUL JACKSON RICE -- CHIEF COUNSEL DEPARTMENT OF TRANSPORTATION, NHTSA TITLE: NONE ATTACHMT: ATTACHED TO LETTER DATED 2-11-93 FROM JOHN WOMACK TO CHRISTOPHER J. DANIELS (A40; STD. 109; STD. 119; PART 574) TEXT: I have recently inspected a tire manufactured in Canada, on which the DOT number had been obliterated with a cutting tool to the point that the DOT number is completely gone. It is my belief that the tire was knowingly and improperly sold with the tire's DOT number removed. On this basis, would you or someone at the Department of Transportation advise on the following: 1. If it is illegal for a tire to be exported from Canada to the United States without a DOT serial number in violation of customs, UCC, or FMVSS regulations. 2. If it is illegal to sell, or use, a tire for highway use without a DOT serial number. After reviewing FMVSS Nos. 109 and 119 and Part 574 regarding tire identification regulations, I have not been able to find language which specifically and clearly states that it is illegal to sell or use a tire for highway use without a DOT serial number, although that is my interpretation. I inquire as to whether or not you can provide or assist me in locating any documentation which could address the above questions. Your assistance will be greatly appreciated. Please call me if you would like to discuss this further. |
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ID: nht92-1.17OpenDATE: 12/18/92 FROM: KENNETH A. GALLO -- HOWREY & SIMON TO: Marion C. Blakey -- Administrator, NHTSA TITLE: MICHO INDUSTRIES AND SAFETY RESEARCH MANUFACTURING, INC. PETITION FOR EXEMPTION ATTACHMT: ATTACHED TO LETTER DATED 2-19-93 FROM JOHN WOMACK TO KENNETH A. GALLO (A40; PART 5SS; VSA 108) TEXT: Pursuant to 15 U.S.C. @ 1397(a)(2)(B) (1982), Micho Industries and Safety Research and Manufacturing, Inc. respectfully submit the enclosed Petition for Exemption. ATTACHMENT 12-18-92 PETITION FOR EXEMPTION REGARDING MICHO INDUSTRIES AND SAFETY RESEARCH AND MANUFACTURING. (TEXT OMITTED.) |
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ID: nht92-1.18OpenDATE: 12/17/92 FROM: PAUL JACKSON RICE -- CHIEF COUNSEL, NHTSA TO: DOUGLAS BERG -- PRESIDENT, ASCEND PRODUCTIONS ATTACHMT: ATTACHED TO LETTER DATED 10-12-92 FROM DOUGLAS BERG TO PAUL J. RICE (OCC 7896) TEXT: This responds to your letter asking whether Standard No. 125, Warning Devices, applies to your product, the "Hazard Helper Safety Sign." In an earlier letter to the agency, you stated that this reversible device attaches to the driver's window and displays either a help needed symbol (a stick figure with extended arms and legs) or a hazard alert symbol (a triangle). In my July 28, 1992 response, I explained that your device was subject to the Standard and that it appeared not to comply with certain provisions in the Standard. In a subsequent letter, you explain that you have added a cyalume light stick to your product to illuminate the warning sign. As explained below, you are correct in your belief that your warning device containing a light stick would no longer be subject to Standard No. 125. As you correctly stated, Standard No. 125 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." (emphasis added; see section S3) In other words, Standard No. 125 does not apply to warning devices with self-contained energy sources. In an August 10, 1982 interpretation to Dwight Hicks, Jr., the agency determined that the phrase "self-contained energy sources" includes such things as cyalume light sticks. Accordingly, a warning device to which a cyalume light stick was added would not be subject to Standard No. 125 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: nht92-1.19OpenDATE: 12/16/92 FROM: PAUL JACKSON RICE -- CHIEF COUNSEL, NHTSA TO: SHAFI J. KEISLER -- PRESIDENT, ONE MORE RUN, INC. ATTACHMT: ATTACHED TO LETTER DATED 11-24-92 FROM SHAFI J. KEISLER TO PAUL J. RICE (OCC 8069) TEXT: This responds to your letter of November 24, 1992, with respect to the manufacture of a replacement taillamp lens for the 1966-67 Dodge Charger. You ask for "all safety standards information pertinent to the manufacture of this replacement lens", and inform us that you "will use only "current DOT and SAE safety approved material to build this item." As Taylor Vinson explained to you, Federal Motor Vehicle Safety Standard No. 108 Lamps, Reflective Devices and Associated Equipment was amended effective January 1, 1972, to apply to replacement lighting equipment for motor vehicles manufactured on and after that date (the standard had previously applied only to original equipment on passenger cars manufactured on and after January 1, 1969). This means that replacement taillamps designed specifically for the 1966-67 Dodge Charger have never been covered by a Federal motor vehicle safety standard. Paragraph S5.1.2 of Standard No. 108 does require that plastic materials used for optical parts such as lenses conform to SAE Recommended Practice J576c, May 1970, with certain exceptions. Although this could be construed as requiring compliance of plastics used in any replacement taillamp lens, we do not interpret this as mandating compliance of plastic materials for a lens in a replacement lamp that is itself not subject to Standard No. 108. However, S5.1.2 is the Federal requirement that you would be obliged to meet were you manufacturing new or replacement taillamp lenses for contemporary motor vehicles. I enclose a copy of S5.1.2 and J576c for your information. We appreciate your desire to meet current safety requirements. (ATTACHMENTS OMITTED) |
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ID: nht92-1.2OpenDATE: December 30, 1992 FROM: Stephen P. Wood -- Assistant Chief Counsel for Rulemaking, NHTSA; Signature by John Womack TO: Rodney T. Nash -- Vice President Engineering, Collins Industries, Inc. TITLE: None ATTACHMT: Attached to letter dated 11/9/92 from Rodney T. Nash to Administrator, NHTSA (OCC 7996) TEXT: This responds to your letter to the Administrator, National Highway Traffic Safety Administration (NHTSA), received in this office on November 18, 1992, and your telephone conversation of November 30, 1992 with Walter Myers of this office, regarding the proper classification of an ambulance. You indicated that Wheeled Coach Industries of Orlando, Florida, a subsidiary of Collins Industries, produces ambulances that are built on truck chassis. You stated that in the past those vehicles have been classified as trucks, but that Ford Motor Company auditors told you that they should be classified as multipurpose passenger vehicles (MPV). You said that you needed to know how v m;swl4(FAA@P/O=1[[YCBX[YX\\\YHH]Y[ H\YX] [XTBBH \Y\Y[X[[\H][ \\H\[\Z X\B X\HY[Y [ HHY\[Y[] [ H MK\H[BZ XH] [ ]H\^\HZ[\\YY\H L\B\ X \XYZ] \HX\\] XX[X]\\B\[[\Y\] [ated into Standard No. 108, any device that contains more than three lighted sections, or LEDs, need only comply with the requirements prescribed for three lighted sections. "(2) Where the above view is acceptable, could we consider the number of lighted section (sic) as 'one' in case of a lamp which contains three LED arrays arranged as shown in the attached drawing, if the circumferenc (sic) of three projected luminous areas does not exceed 150mm both in horizontal and vertical dimension?" The answer is no under Standard No. 108 as it presently exists. The drawing you have enclosed depicts three "lighted areas of LEDs" with two separations. Your question is based upon SAE J1889, which defines a "one compartment LED lamp" as one whose "maximum projected linear dimension" does not exceed 150mm. Thus, the linear dimension of a two-compartment LED lamp is 151-300mm, and that of a three-compartment LED lamp is 301mm and greater. These dimensional specifications prevent LED lamps from achietion of persons. Accordingly, an ambulance falls within the definition of MPV rather than truck. I hope this will help clarify this issue for you. Should you have any further questions in this regard, please feel free to contact Mr. Myers at this address or at (202) 366-2992. |
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ID: nht92-1.20OpenDATE: 12/16/92 FROM: PAUL JACKSON RICE -- CHIEF COUNSEL, NHTSA TO: ROBERT R. MCAUSLAND, P.E. ATTACHMT: ATTACHED TO LETTER DATED 10-9-92 FROM ROBERT R. MCAUSLAND (OCC 7854) TEXT: This responds to your letter asking whether your design of an infant seat would comply with S5.2.4 of Federal Motor Vehicle Safety Standard No. 213, Child Restraint Systems. You state that your infant seat would have a frame made from 1/4 inch thick polyethylene sheet, and that all the edges of the frame are rounded to a radius of 1/8 inch. As discussed below, the design would not comply if the edges of the seat frame are contactable by the infant dummy's head or torso during the standard's dynamic test. Some background information on Federal motor vehicle safety laws and regulations may be helpful. The National Traffic and Motor Vehicle Safety Act (15 U.S.C. @ 1381 et seq., Safety Act) authorizes this agency to issue safety standards applicable to new motor vehicles and 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 Safety Act establishes a "self-certification" process under which each manufacturer is responsible for certifying that its products meet all applicable safety standards. The following represents our opinion based on the facts set forth in your letter. Standard No. 213 specifies requirements for child restraint systems used in motor vehicles and aircraft, to reduce the number of children killed or injured in motor vehicle crashes and in aircraft. S5.2.4, "Protrusion limitation," of Standard No. 213 states: Any portion of a rigid structural component within or underlying a contactable surface, or any portion of a child restraint system surface that is subject to the requirements of S5.2.3 [the head impact protection requirements for infant seats], shall, with any padding or other flexible overlay material removed, have a height above any immediately adjacent restraint system surface of not more than 3/8 inch and no exposed edge with a radius of less than 1/4 inch. (Emphasis added.) The term "contactable surface" is defined in S4 of the standard as "any child restraint system surface (other than that of a belt, belt buckle, or belt adjustment hardware) that may contact any part of the head or torso of the appropriate test dummy, specified in S7, when a child restraint system is tested in accordance with S6.1." Under S5.2.4, any edges of a rigid structural component within or underlying a surface that can be contacted by the head or torso of the appropriate test dummy during Standard No. 213's dynamic test must have a radius of at least 1/4 inch. Since the frame edges of your infant seat have a radius of only 1/8 inch, the seat would not comply with S5.2.4 if the surfaces overlying those edges can be contacted by the infant dummy during the dynamic test. You ask whether, since side loading is not specified in Standard No. 213, can you conclude that there is no way that the child's head or torso could contact the sides of the frame, i.e., that the surfaces overlying those edges cannot be contacted by the infant dummy during the dynamic test. We assume that you believe the infant's head and torso are unlikely to contact the frame's edges in the 213 dynamic test since, due to the forward motion of the test, the dummy's components are likely to move forward and rearward, rather than laterally. I note that, for purposes of compliance testing, NHTSA would determine whether the surfaces are contactable surfaces for the purposes of S5.2.4 by observing a dynamic test, conducted according to the procedures in Standard No. 213. With respect to the issue of what information or analysis would be sufficient, for purposes of certification, for you to conclude that the surfaces overlying those edges cannot be contacted by the infant dummy during the dynamic test, manufacturers must have some basis for their certification that a product complies with all applicable safety standards. However, this does not necessarily mean that a manufacturer must conduct the specific tests set forth in an applicable standard. Certifications may be based on, among other things, engineering analyses, actual testing, and computer simulations. You should be aware, however, that the direction of dummy movement during the Standard No. 213 dynamic test depends on many variables other than the direction of the test, such as the performance of the restraint's belt system. For example, in the event a child seat's upper torso restraint slipped off the dummy's shoulder in the dynamic test, the dummy could move laterally and strike the sides of the restraint system. You should consider all of the variables that could affect the dummy's performance when determining whether frame contact can occur. I also note that manufacturers of motor vehicles and motor vehicle equipment are subject to the defect provisions of the National Traffic and Motor Vehicle Safety Act. Infant restraints are involved in real-world crashes other than the frontal impacts simulated in Standard No. 213. If data indicated that a child seat exposed occupants to an unreasonable risk of injury, such as sharp edges resulting in injuries in a side crash, the agency might conduct a defect investigation which could lead to a safety recall. Enclosed is an information sheet which provides additional information for new manufacturers of motor vehicles and motor vehicle equipment. If you have further questions, please call Ms. Deirdre Fujita of my staff at (202) 366-2992. |
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ID: nht92-1.21OpenDATE: 12/16/92 FROM: DALE E. DAWKINS -- DIRECTOR, VEHICLE COMPLIANCE AND SAFETY AFFAIRS, CHRYSLER CORPORATION TO: MARION C. BLAKEY -- ADMINISTRATOR, NHTSA TITLE: PETITION FOR TEMPORARY EXEMPTION: LOW EMISSION MOTOR VEHICLE - DATED DECEMBER 4, 1991; GRANT OF PETITION FOR TEMPORARY EXEMPTION FROM THREE FEDERAL MOTOR SAFETY STANDARDS (DOCKET NO. 91-66; NOTICE 2) - DATED JUNE 19, 1992 ATTACHMT: ATTACHED TO LETTER DATED 2-18-93 FROM JOHN WOMACK TO DALE E. DAWKINS (A40; PART 555) TEXT: Chrysler Corporation desires to inform the NHTSA that we will manufacture 10 Chesapeake Consortium Electric Vehicles (CCEV's) that will fall under the temporary exemption that the agency has granted for the TEVan, an electrically powered version of the Dodge Caravan/Plymouth Voyager multipurpose passenger vehicle. The exemptions for these CCEV's are to be coterminous with that granted the TEVan vehicle. This consortium is a joint cooperative effort by Chrysler Corporation, Westinghouse Corporation, the State of Maryland, and Baltimore Gas and Electric Power to develop electrically powered low-emission passenger vehicles under contract to the U.S. Department of Transportation. These CCEV vehicles will be almost identical to the TEVans except for the propulsion system which will utilize an AC electrical motor, whereas the TEVans will be powered by a DC electrical motor. The CCEV with its AC motor will utilize a unique speed reduction direct drive transaxle, whereas the TEVan with its DC motor will utilize a speed reduction 2-speed transaxle. All compliance and product aspects of the vehicle program remain unchanged per our petition to the Agency on December 4, 1991 and later modified via a docket file submission on March 5, 1992. Based on our engineering judgement, there is no significant difference between the CCEV or TEVan in terms of overall vehicle safety. We seek no broader temporary exemptions from FMVSS for the development of low emission vehicles than those already granted for the TEVan. The combined volumes of the CCEV and TEVan vehicles will not exceed the maximum units of the petition that was granted by the NHTSA. The above information allows the NHTSA to clearly understand the content of our electric vehicle development programs and the extent of the exemptions under which these vehicles will be manufactured. If you have any questions concerning this information, please contact Mr. Len Blazic of my staff at (313) 956-5365. |
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ID: nht92-1.22OpenDATE: December 16, 1992 FROM: Bryan D. Patton -- International Automobile Ent. Inc. D.B.A. ERA Replica Automobile TO: Paul Jackson Rice -- Office of Chief Counsel, NHTSA TITLE: None ATTACHMT: Attached to letter dated 5-12-93 from John Womack to Bryan D. Patton (A41/ Std. 106) TEXT: I am writing you in regards to a conversation I had with Zack Fraser, an Engineer in the safety compliance division of NHTSA (Phone 202-366-2830). I asked Mr. Fraser which US DOT regulations had to be met for tubing used for hydraulic brake lines in an automotive application. Mr. Fraser responded that there were no codes of regulations dealing specifically with these lines in this application. He did say that in the absence of federal regulations that the SAE standard would generally be used to determine suitability of a material to be used in such an application. If possible, I would like a statement of fact from NHTSA recognizing that: 1) International Automobile Enterprises Inc. has contacted you in this matter. 2) There are no specific federal codes or regulations regarding the use of tubing for use as automotive hydraulic brake lines. 3) The SAE standard would be used to determine such suitability in the absence of a specific federal code or regulation. Our purpose for requesting this documentation is to be able to substantiate that International Automobile Enterprises Inc. has made an effort in good faith to research all applicable federal motor vehicle safety standards, or any SAE specifications used in place of federal specifications. Not being an attorney, I suspect the above statements may have to be reworded or altered, but these statements are true to the best of my knowledge based on my conversations with Mr. Fraser. Thank you for your cooperation in this matter. |
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ID: nht92-1.23OpenDATE: 12/14/92 FROM: PAUL JACKSON RICE -- CHIEF COUNSEL, NHTSA TO: ROBERT F. GAYER -- EQUIPMENT COORDINATOR, TRANSPORTATION SERVICES, SALT RIVER PROJECT ATTACHMT: ATTACHED TO LETTER DATED 10-5-92 FROM ROBERT F. GAYER TO NHTSA CHIEF COUNSEL (OCC 7855) TEXT: This responds to your letter asking whether certain trailers, manufactured in 1989, were required to comply with Federal Motor Vehicle Safety Standard No. 121, Air Brake Systems. (49 CFR @ 571.121). You explained that you disagree with statements by the trailers' manufacturer that "these trailers do not need to comply with '121,' because they are 'Heavy Haul Trailers.'" You further stated that the trailers may not comply with certain provisions in Standard No. 121, including the reservoir requirements in S5.2.1.1 and S5.2.1.5. I note that we previously responded to a similar letter from Salt River Project concerning certain trailers manufactured in 1987. Our letter (copy enclosed) was sent to Mr. Derral T. Crance on April 3, 1989. We explained that heavy hauler trailers are not excepted from Standard No. 121 unless they have a GVWR of more than 120,000 pounds. Since you indicated that the trailers of current concern have a GVWR of 68,000 pounds, they would not be excepted from the standard as heavy hauler trailers. Moreover, the trailers do not appear to come within any of the other exceptions to Standard No. 121. Standard No. 121 does, however, include a number of special provisions for heavy hauler trailers, including exceptions from certain requirements. Of particular note, S5.6 sets forth a number of specific parking brake requirements but permits heavy hauler trailers to meet the requirements of either that section, or, at the option of the manufacturer, the requirements of 49 CFR @ 393.43. Part 393 requires commercial motor vehicles to be equipped with various types of equipment, including brakes. Specifically, section 393.43 addresses brake requirements in breakaway and emergency braking situations. Heavy hauler trailers manufactured in 1989 were generally subject to sections S5.2.1.1 and S5.2.1.5 of Standard No. 121, the provisions about which you specifically asked. Under S5.2.1.1, a reservoir was required to be provided that is capable of releasing the vehicle's parking brakes at least once and that is unaffected by a loss of air pressure in the service brake system. Under S5.2.1.5, each service reservoir was required to be protected against loss of air pressure due to failure or leakage in the system between the service reservoir and its source of air pressure by check valves or equivalent devices. Notwithstanding the general applicability of S5.2.1.1, certain heavy hauler trailers which complied with the requirements of 49 CFR 393.43 instead of the specific parking brake requirements set forth in S5.6 would not have had to comply with S5.2.1.1. This is so because the vehicle is not required to have parking brakes. However, a braking system is required which applies automatically and promptly upon breakaway from a towing vehicle. Such a vehicle would also be required to carry sufficient chocking blocks to prevent movement when parked, as required by @ 393.41. Since your letter suggests that you purchased trailers that may not have complied with Standard No. 121, I have referred the matter to our Office of Vehicle Safety Compliance for appropriate action. 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: nht92-1.24OpenDATE: 12/14/92 FROM: PAUL JACKSON RICE -- CHIEF COUNSEL, NHTSA TO: MICHAEL J. MOTZKIN -- PIONEER PLUMBING ATTACHMT: ATTACHED TO LETTER DATED 10-14-92 FROM MICHAEL J. MOTZKIN TO PAUL J. RICE (OCC 7871) TEXT: This responds to your letter of October 14, 1992 regarding Federal requirements pertaining to brake specifications. In particular you asked whether there are any regulations requiring automotive brake drums and rotors not to be milled beyond manufacturer specifications, and whether manufacturers are required to stamp their specifications on brake drums and rotors. I am pleased to have this opportunity to explain our law and regulations for you. The National Traffic and Motor Vehicle Safety Act of 1966 (Safety Act) authorizes the National Highway Traffic Safety Administration (NHTSA) to issue Federal motor vehicle safety standards for new motor vehicles and new motor vehicle equipment. All motor vehicles and items of motor vehicle equipment manufactured or imported for sale in the United States must comply with all applicable safety standards. This agency does not provide approvals of motor vehicles or motor vehicle equipment. Under the Safety Act, the manufacturer is responsible for certifying that its motor vehicles or equipment meet applicable standards. NHTSA has issued a number of safety standards which specify performance requirements for new motor vehicle brake systems and certain new brake equipment. The standards do not require manufacturers to stamp specifications on drums or rotors, although it is common practice for manufacturers to do so. The Federal motor vehicle safety standards do not apply to a motor vehicle after its first sale to a consumer. However, manufacturers, distributors, dealers, or motor vehicle repair businesses modifying a used vehicle are prohibited by section 108(a)(2)(A) of the Safety Act from knowingly rendering inoperative any safety device or element of design installed on or in a motor vehicle or item of motor vehicle equipment in compliance with a safety standard. The milling or turning of brake drums and rotors is typically performed during the course of repairing a used vehicle with worn brakes. We do not believe that the "render inoperative" provision would ordinarily be relevant to such a situation. The states may regulate the repair of motor vehicles. We suggest you investigate the laws of Arizona to see whether they affect your situation. I hope this information is been helpful. If you have any further questions about NHTSA's safety standards, please feel free to contact David Elias of my staff at this address or by telephone at (202) 366-2992. |
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.