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: aiam3596OpenMr. F. E. Bettridge, Board Chairman, Middlekauff, Inc., 1615 Ketcham Avenue, Toledo, OH 43608; Mr. F. E. Bettridge Board Chairman Middlekauff Inc. 1615 Ketcham Avenue Toledo OH 43608; Dear Mr. Bettridge: This is in reply to your petition of July 16, 1982, for a temporar exemption from Federal Motor Vehicle Safety Standard No. 301, *Fuel System Integrity*.; You have told us that 'as a seller and installer of truck bodies, w are frequently called upon to install a body on an incomplete vehicle furnished to us by a major manufacturer through his dealer.' Our regulation on vehicles manufactured in two or more stages (49 CFR Part 568) requires the manufacturer of an incomplete vehicle to furnish, with the vehicle, statements with respect to each of the standards which inform the final stage manufacturer of the vehicle's compliance status. With respect to Standard No. 301, each manufacturer should provide you with a statement of specific conditions of final manufacture under which the completed vehicle will conform or, alternatively, a statement that the vehicle when completed will conform if no alterations are made in identified components of the incomplete vehicle.; These statements afford a basis for your certification of complianc with Standard No. 301 without the necessity of testing. We would like to know which of these statements have been provided and why you may believe your manufacturing operations are such that you could not certify compliance with Standard No. 301.; We would also like to make clear that there is no legal requiremen that you crash test a $10,000 vehicle in order to demonstrate compliance. Certification may be based upon computer simulation, mathematical calculation, or engineering studies. Upon reflection you may decide that you have an adequate basis for certification with Standard No. 301.; Until we hear further from you, we shall hold your petition i abeyance.; Sincerely, Frank Berndt, Chief Counsel |
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ID: aiam1051OpenMr. R. W. Lillie, 3345 Wilshire Boulevard, Suite 204, Los Angeles, CA 90010; Mr. R. W. Lillie 3345 Wilshire Boulevard Suite 204 Los Angeles CA 90010; Dear Mr. Lillie: Thank you for your letter of January 30, 1973, and our sincer apologies for the delay in responding to your letter.; There are no Federal Motor Vehicle Safety Standards applicable t plastic fuel tanks. Standard No. 301, which includes the fuel tank in the crash performance requirements of the vehicle, makes no reference to the construction or design details of the fuel tank. A booklet briefly describing the issued standards is enclosed.; The Department of Transportation does not routinely receive and tes fuel tanks of the various manufacturers, however, the Department keeps abreast of technical advancements of these companies through technical society meetings and trade journals. it has been brought to our attention that Dow Chemical Company has done considerable work with high density polyethylene fuel tanks and offers an internal treatment of these tanks which is claimed to reduce considerably the permeation of gasoline through the walls. Further information may be obtained from the following source:; >>>Dow Chemical U.S.A., Plastics Department, Midland, Michigan 48640<<< Standard No. 116 is applicable to Hydraulic Brake Fluids and i included in the consolidated edition of the Federal Motor Vehicle Safety Standards and Regulations, as per the enclosed order form.; The physical characteristics and labeling requirements of brake fluids including silicones, are included in this standard, a copy of which is enclosed for your information. Your inquiry concerning the use of silicones in automobiles can best be answered by the Original Equipment Manufacturers or the automotive companies. The interest of the Department in materials is primarily performance rather than design considerations, for example, an elastomeric material could be silicone, neoprene, or other elastomer, as long as the standards are complied with.; The Bureau of Motor Carrier Safety has issued standards that ar applicable to commercial vehicles engaged in interstate commerce, and some of those standards apply to fuel tanks. A portion of these regulations that pertains to fuel tanks is also enclosed for your information, along with an Advance Notice of Proposed Rule Making that concerns plastic fuel tanks (F.R., Vol. 36, No. 178, September 14, 1971). Additional information is available from the Bureau of Motor Carrier Safety, Federal Highway Administration, 400 Seventh Street, S.W., Washington D.C. 20590.; Sincerely, Robert L. Carter, Associate Administrator, Motor Vehicl Programs; |
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ID: aiam4603OpenMr. David Blumberg Structofab, Inc. 915 Clifton Avenue Clifton, NJ 07013; Mr. David Blumberg Structofab Inc. 915 Clifton Avenue Clifton NJ 07013; "Dear Mr. Blumberg: This responds to your letter asking whether you company qualifies as a 'remanufacturer.' You explained that your company acquires the chassis (without the body) of right hand drive jeep-type vehicles that have been used by the United States Postal Service. You further explained that your company undertakes extensive operations to repair, restore, and replace parts of the used chassis and to add to the chassis a new body, hood, seats, and interior. There is no 'remanufacturer' category in any of this agency's laws or regulations. However, based on the facts presented in your letter, your company would appear to be a 'manufacturer.' Section 102(5) of the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1391(5)) defines a 'manufacturer' as 'any person engaged in the manufacturing or assembling of motor vehicles or motor vehicle equipment, including any person importing motor vehicles or motor vehicle equipment for resale.' (emphasis supplied) Since your company plans to assemble vehicles, it would appear to be a 'manufacturer' under this definition and subject to the responsibilities imposed on a manufacturer by the Safety Act and our regulations issued thereunder. Among these responsibilities are: 1. Registration. 49 CFR Part 566, Manufacturer Identification, requires a 'manufacturer' of motor vehicles to submit identifying information and a description of items produced. 2. Federal Motor Vehicle Safety Standards and Certification: Section 114 of the Safety Act (15 U.S.C. 1403) requires each 'manufacturer' to certify that every one of its new vehicles complies with all applicable safety standards. The agency's longstanding position with respect to vehicles assembled by adding new bodies to the chassis of vehicles previously registered for use on the public roads is that such vehicles are themselves considered used motor vehicles. This agency position means that manufacturers such as your company would not be required to certify that such vehicles comply with all applicable safety standards as of the date the vehicle is assembled. The only exception to this general rule arises under section 108(a)(2)(A) of the Safety Act, which prohibits any manufacturer, distributor, dealer, or motor vehicle repair business from 'rendering inoperative' any device or element of design installed in a vehicle in compliance with an applicable safety standard. We have interpreted this provision of the law as requiring any person (other than the vehicle owner) that has removed an old body in order to install a new one to ensure that the newly assembled vehicle meets the standard that the vehicle originally did (e.g., a vehicle comprised of a body manufactured in 1989 mounted on a used 1976 chassis must meet all standards that applied to vehicles manufactured in 1976). Your company would be responsible for any violations of this requirement for all of its vehicles from which your company itself has removed the old body from the used chassis and for all vehicles from which the old body was removed from the used chassis at the behest of your company. 3. Notification and Remedy. The Safety Act requires manufacturers to notify owners and remedy without charge to the owners any safety-related defect discovered in the assembled vehicle. For your information, I have enclosed a general information sheet for new manufacturers that summarizes the provisions of our law and regulations and tells how to get copies of our regulations. If you have any further questions or need additional information on this subject, please feel free to contact Marvin Shaw of my staff at this address or by telephone at (202) 366-2992. Sincerely, Stephen P. Wood Acting Chief Counsel Enclosure"; |
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ID: aiam1401OpenHonorable Leonor K. Sullivan, House of Representatives, Washington, DC 20515; Honorable Leonor K. Sullivan House of Representatives Washington DC 20515; Dear Mr. Sullivan: In response to your February 11, 1974, request in behalf of constituent, Mr. Frank Mills of Saint Louis, I would like to discuss the legal implications of modifications to the ignition interlock system on 1974 model passenger cars. I am not familiar with the booklet to which Mr. Mills refers.; The interlock is one part of Standard 208, which like any other safet standard issued under the National Traffic and Motor Vehicle Safety Act of 1966, applies to new vehicles only. Once a vehicle is sold for purposes other than resale and the buyer takes delivery, he may modify the system or legally have the system modified by an automobile repair service to accommodate circumstances, such as physical incapacity, which make use of the belts unwise or inconvenient.; Whether or not a dealer's disconnection of an interlock system unde any given specified set of circumstances would be legally permitted is a conclusion which the courts would determine if called upon to decide such an issue. The position of this agency is that any act by a dealer to disconnect an interlock system which could be related to a sales transaction or the introduction into interstate commerce of a motor vehicle is prohibited. In this respect, we support H.R. 5529 which would prohibit any motor vehicle manufacturer, distributor, dealer, or repair business from removing or rendering inoperative any Federally-required safety equipment, including interlocks, from new or used vehicles. The prohibition would not apply to vehicle owners.; I have taken the liberty of forwarding a copy of this letter to Mr Mills at his St. Louis address to assure receipt of the information by February 21, 1974.; Sincerely, Lawrence R. Schneider, Chief Counsel |
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ID: aiam3312OpenMichael M. Packard, Commissioner, Indiana Bureau of Motor Vehicles, State Office Building, Indianapolis, IN 46204; Michael M. Packard Commissioner Indiana Bureau of Motor Vehicles State Office Building Indianapolis IN 46204; Dear Mr. Packard: This is in response to your letter of May 28, 1980, in which yo requested approval to use Indiana's Certificate of Title as a substitute for the Federal Odometer disclosure form required by 49 CFR Part 580.; Because the Federal odometer requirements that became effective as o January 1, 1978, contain a good deal of wish to include odometer information on their titles to use a shortened form that was adopted by the American Association of Motor Vehicle Administrators (AAMVA). We consider the AAMVA form to include the minimum amount of information necessary for an adequate disclosure. In addition to the information included on the Certificate of Title which you submitted to our office, the following information is also required:; >>>(1) a reference to State or Federal law, (2) a statement that the odometer reading reflects the amount o mileage over 99,999 miles,; (3) a statement that the odometer mileage is not actual, (4) the signature of the buyer.<<< Without these four items the title cannot be used in lieu of a separat Federal form. If this information is included, the National Highway Traffic Safety Administration will approve the title for use in lieu of the Federal form.; Sincerely, Frank Berndt, Chief Counsel |
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ID: aiam2850OpenMr. H. J. T. Young, Vice President - Technical Affairs, Cibie Corporation, 725 South Adams Road, Suite 209, Birmingham, MI 48011; Mr. H. J. T. Young Vice President - Technical Affairs Cibie Corporation 725 South Adams Road Suite 209 Birmingham MI 48011; Dear Mr. Young: This is in belated reply to your letter of December 15, 1977 requesting an interpretation of Federal Motor Vehicle Safety Standard No. 108, *Lamps, Reflective Devices and Associated Equipment*. Your request concerned the legality of installation on motor vehicles of remote manual or of automatic headlamp aiming equipment.; If a headlamp assembly meets the requirements of Standard No. 108 whe installed with or without auxiliary means of aiming, we consider the assembly to be in conformance. Your device does not appear to impair the effectiveness of the required lighting equipment within the prohibition of S4.1.3, and either device that you described would apparently provide an additional safeguard against glare when the rear of the vehicle is heavily loaded.; Sincerely, Joseph J. Levin, Jr., Chief Counsel |
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ID: aiam3742OpenMr. Karl-Heinz Ziwica, Manager, Safety & Emission Control Engineering, BMW of North America, Inc., Montvale, NJ 07645; Mr. Karl-Heinz Ziwica Manager Safety & Emission Control Engineering BMW of North America Inc. Montvale NJ 07645; Dear Mr. Ziwica: This responds to your letter requesting an interpretation of Standar No. 105, *Hydraulic Brake Systems*. Your request was in regard to a type of brake reservoir you are considering producing which would contain common fluid for the brake circuits and the brake hydraulic power assist unit. The issue raised by your letter was whether section S5.4.2 of the standard permits the common fluid to be counted as part of the minimum capacity required for the braking system. As discussed below, the answer to that question is no.; The first sentence of section S5.4.2 states: >>>Reservoirs, whether for master cylinders of other type systems shall have a total minimum capacity equivalent to the fluid displacement resulting when all the wheel cylinders or caliper pistons serviced by the reservoirs move from a new lining, fully retracted position (as adjusted initially to the manufacturer's recommended setting) to a fully worn, fully applied position, as determined in accordance with S7.18(c) of this standard.<<<; As noted by your letter, the agency has previously interpreted thi section with respect to a brake reservoir servicing both the braking system and the clutch. In an October 9, 1981, letter to Toyota, we explained:; >>>This section specifies the total minimum fluid capacity that vehicle's braking system reservoirs must have. That amount is determined by reference to the vehicle's braking system, i.e., by the fluid displacement which results when all the wheel cylinders or caliper pistons serviced by the reservoirs move from a new lining, fully retracted position to a fully worn, fully applied position. The purpose of this requirement is to assure that a vehicle's braking system reservoirs have adequate fluid capacity to service the brakes.; The agency interprets section S5.4.2 to require that the minimum flui capacity requirements be met by fluid which is solely available to the brakes. If fluid is available to both the brakes and the clutch, some of that fluid will be used by the clutch in normal service and thus be unavailable to the brakes. In the event of clutch failure, all of the common fluid may be used by the clutch. Therefore, while Standard No. 105 does not prohibit manufacturers from producing master cylinders with reservoirs that have some fluid available to both the braking system and the clutch, none of that common fluid may be counted toward meeting the minimum requirements of section S5.4.2.<<<; This same rationale applies to a reservoir which contains common flui for the brake circuits and brake hydraulic power assist unit. As indicated in our October 1981 letter, the minimum fluid capacity requirements were determined by reference to the vehicle's braking system for the purpose of assuring that a vehicle's braking system reservoirs have adequate fluid capacity to service the brakes, i.e., the wheel cylinders and pistons. More specifically, the requirement for minimum capacity equivalent to the fluid displacement resulting when all the wheel cylinders or caliper pistons serviced by the reservoirs move from a new lining, fully retracted position to a fully worn, fully applied position, was based upon maintaining a sufficient supply of fluid to enable a vehicle to stop even when there was complete brake lining wear-out in the service brakes. Put another way, the requirement assures an adequate supply of brake fluid over the lifetime of the brake linings, even if a driver fails to add fluid as part of routine maintenance.; This purpose would not be met if fluid available to both the brak circuits and brake hydraulic power assist unit was counted toward meeting the minimum fluid capacity requirements. Some of the common fluid would be used by the brake hydraulic power assist unit in normal service and thus be unavailable to the brake circuits. Moreover, in some instances of brake hydraulic power assist unit failure (e.g., a failure in the brake hydraulic power assist unit return line), all of the common fluid might be used by that unit.; Sincerely, Frank Berndt, Chief Counsel |
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ID: aiam4087OpenPaul A. Lester, Esq., Shapiro, Lester & Abramson, P.A., Roland/Continental Plaza, 3250 Mary Street, Miami, FL 33133; Paul A. Lester Esq. Shapiro Lester & Abramson P.A. Roland/Continental Plaza 3250 Mary Street Miami FL 33133; Dear Mr. Lester: This is in response to your request of January 14, 1986, for a rulin that the lessor/seller may issue an odometer disclosure statement to the lessee/buyer at the inception of the lease and not at the time of transfer.; Title IV of the Motor Vehicle Information and Cost Savings Act, 1 U.S.C. SS 1981-1991, directs the Secretary of Transportation to prescribe rules requiring any transferor to give a written disclosure of certain information to the transferee 'in connection with the transfer of ownership.' Transfer of ownership is defined in accordance with State law. Florida law specifies that issuance of the automobile title certificate and license constitutes presumptive ownership of a vehicle. Therefore, the written disclosure is required to be given when the title certificate and license are issued. While the National Highway Traffic Safety Administration has granted exemptions to the regulations promulgated pursuant to the Act, we cannot issue an exemption to any provisions of the Act itself.; In addition to the Federal requirements, the Florida motor vehicl title law states: 'No notary public shall notarize a title transfer until the *seller* properly indicates the odometer reading.' West F.S.A. S 319.22 (emphasis added). Therefore, in addition to your request being prohibited by Federal law, it may also be prohibited under State law.; Sincerely, Erika Z. Jones, Chief Counsel |
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ID: aiam1285OpenWilliam C. Burns, Esq., Schultz, Evans and Burns, P.O. Box 1493, Lafayette Bank and Trust Builidng(sic), Lafayette, Indiana 47902; William C. Burns Esq. Schultz Evans and Burns P.O. Box 1493 Lafayette Bank and Trust Builidng(sic) Lafayette Indiana 47902; Dear Mr. Burns: This is in reply to your letter of September 28, 1973 to Secretar Brinegar, concerning outside rear view mirrors.; The existing standard (No. 111) on *Rearview Mirrors*, is found i Title 49, Code of Federal Regulations S 571.111. Paragraph S3.2 established requirements for outside mirrors. This standard applies to all passenger cars and multipurpose passenger vehicles manufactured since January 1, 1968, and establishes requirements for original equipment mirrors. It does not apply to mirrors manufactured for the aftermarket.; Sincerely, Lawrence R. Schneider, Chief Counsel |
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ID: aiam2503OpenMr. Tokia Iinuma, Nissan Motor Co., Ltd., P.O. Box 1606, Englewood Cliffs, N.J. 07632; Mr. Tokia Iinuma Nissan Motor Co. Ltd. P.O. Box 1606 Englewood Cliffs N.J. 07632; Dear Mr. Iinuma: This responds to your January 6, 1977, question regarding the effectiv date of the recent amendment to Standard No. 116, *Motor Vehicle Brake Fluids*, That specifies color coding requirements for brake fluids (41 FR 54942, December 16, 1976). You asked whether motor vehicles manufactured after the effective date for the color coding requirements (September 1, 1978) may be equipped with brake fluids manufactured prior to that date that do not conform to the color coding requirements. The answer to your question is yes. Paragraph S5.3 of Standard No. 116 specifies that motor vehicles having hydraulic brake systems shall be equipped with brake fluid that has been manufactured and packaged in conformity with the requirements of the standard. The agency interprets this to mean that vehicles shall be equipped with any brake fluid that conformed to the requirements of Standard No. 116 at the time the brake fluid was manufactured.; Sincerely, Frank Berndt, Acting Chief Counsel |
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.