NHTSA Interpretation File Search
Overview
NHTSA's Chief Counsel interprets the statutes that the agency administers and the standards and regulations that it issues. Members of the public may submit requests for interpretation, and the Chief Counsel will respond with a letter of interpretation. These interpretation letters look at the particular facts presented in the question and explain the agency’s opinion on how the law applies given those facts. These letters of interpretation are guidance documents. They do not have the force and effect of law and are not meant to bind the public in any way. They are intended only to provide information to the public regarding existing requirements under the law or agency policies.
Understanding NHTSA’s Online Interpretation Files
NHTSA makes its letters of interpretation available to the public on this webpage.
An interpretation letter represents the opinion of the Chief Counsel based on the facts of individual cases at the time the letter was written. While these letters may be helpful in determining how the agency might answer a question that another person has if that question is similar to a previously considered question, do not assume that a prior interpretation will necessarily apply to your situation.
- Your facts may be sufficiently different from those presented in prior interpretations, such that the agency's answer to you might be different from the answer in the prior interpretation letter;
- Your situation may be completely new to the agency and not addressed in an existing interpretation letter;
- The agency's safety standards or regulations may have changed since the prior interpretation letter was written so that the agency's prior interpretation no longer applies; or
- Some combination of the above, or other, factors.
Searching NHTSA’s Online Interpretation Files
Before beginning a search, it’s important to understand how this online search works. Below we provide some examples of searches you can run. In some cases, the search results may include words similar to what you searched because it utilizes a fuzzy search algorithm.
Single word search
Example: car
Result: Any document containing that word.
Multiple word search
Example: car seat requirements
Result: Any document containing any of these words.
Connector word search
Example: car AND seat AND requirements
Result: Any document containing all of these words.
Note: Search operators such as AND or OR must be in all capital letters.
Phrase in double quotes
Example: "headlamp function"
Result: Any document with that phrase.
Conjunctive search
Example: functionally AND minima
Result: Any document with both of those words.
Wildcard
Example: headl*
Result: Any document with a word beginning with those letters (e.g., headlamp, headlight, headlamps).
Example: no*compl*
Result: Any document beginning with the letters “no” followed by the letters “compl” (e.g., noncompliance, non-complying).
Not
Example: headlamp NOT crash
Result: Any document containing the word “headlamp” and not the word “crash.”
Complex searches
You can combine search operators to write more targeted searches.
Note: The database does not currently support phrase searches with wildcards (e.g., “make* inoperative”).
Example: Headl* AND (supplement* OR auxiliary OR impair*)
Result: Any document containing words that are variants of “headlamp” (headlamp, headlights, etc.) and also containing a variant of “supplement” (supplement, supplemental, etc.) or “impair” (impair, impairment, etc.) or the word “auxiliary.”
Search Tool
NHTSA's Interpretation Files Search
| Interpretations | Date |
|---|---|
ID: nht72-5.21OpenDATE: 03/24/72 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Truck Equipment & Body Distributors Association TITLE: FMVSR INTERPRETATION TEXT: This is in reply to your letter of March 6, 1972, concerning the certification of pickup trucks that are modified while still in the hands of a dealer. You describe a situation in which the dealer removes the pickup body and sends the vehicle to a final-stage manufacturer for fitting with a service body. We would consider modifications of the type you describe to be manufacturing under the National Traffic and Motor Vehicle Safety Act, and the Certification regulations (49 CFR Part 567). Because a completed vehicle is involved regulations governing Vehicles Manufactured in Two or More Stages (Part 568) do not apply. One who remanufactures a completed vehicle assumes the responsibility of any manufacturer of completed vehicles. The extent to which he may safely rely on the original GVWR, GAWR, and statement of conformity depends on what he has done to alter the vehicle. He is required to certify the vehicle by affixing his own label, and must take into account the effects of any modifications he makes. |
|
ID: nht72-5.22OpenDATE: 02/07/72 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Downs-Clark TITLE: FMVSR INTERPRETATION TEXT: This is in reply to your letter of December 30, 1971, concerning whether you must comply with the Certification regulations (49 CFR Part 567) in cases where you "re-barrel" or "re-deck" trailers. You describe these processes as installing a new tank (re-barreling) or platform deck (re-decking) on a used trailer under construction furnished by your customer, which includes axles, tires, wheels, springs, hangers, and internal brake assemblies, in serviceable condition. You are not required to certify these vehicles as they are manufactured on used chassis and are considered by this agency to be used vehicles under section 108(b)(1) of the National Traffic and Motor Vehicle Safety Act (15 U.S.C. @ 1397(b)(1)). We are pleased to be of assistance. |
|
ID: nht72-5.23OpenDATE: 11/22/72 FROM: ELWOOD T. DRIVER FOR ROBERT L. CARTER -- NHTSA TO: Truck Trailer Manufacturers Association TITLE: FMVSR INTERPRETATION TEXT: This is in reply to your letter of October 22, 1972, proposing that the "Certification" regulations (49 CFR Part 567) be amended to allow the use of "metal stamping or embossed letters" for information which must be inserted on certification labels. We have treated your request as a petition for rulemaking persuant to 49 CFR Part 553, and have decided that it should be denied. The NHTSA is of the view that numbers and letters added in this way are frequently difficult to read. To allow their use as you have (Illegible Word) would be inconsistent with the purpose of the Certification regulations that the relevant information be provided to (Illegible Word) in as easily legible manner. There is no prohibition, of course, of the use of stamped or embassed lettering on labels if steps are taken to make it contrast with its background. |
|
ID: nht72-5.24OpenDATE: 06/12/72 FROM: AUTHOR UNAVAILABLE; Francis Armstrong; NHTSA TO: McLaughlin Equipment Company TITLE: FMVSR INTERPRETATION TEXT: This is in further reply to your letters to the National Transportation Safety Board and the Secretary of Commerce that have been referred to this office.In your letter to the National Transportation Safety Board you discuss the remounting of old school bus bodies on new truck chassis and ask, what are the implications of a body shop taking the responsibility of modifying the vehicle?" It is assumed that when you refer to modifying you mean remounting a used school bus body on a new chassis. Persons (Illegible Words) new chassis are considered to be manufacturers within the meaning of the National Traffic and Motor Vehicle Safety Act and specifically a final stage manufacturer as defined in Part 565 of Title as of the Code of Federal Regulations. We appreciate your bringing this situation to our attention and presently have the matter under investigation. If you are aware of any one currently involved in this type of business (Illegible Word) might not be aware of their responsibilities, please furnish specific details. I am enclosing the following pertinent publications: 1. National Traffic and Motor Vehicle Safety Act. 2. Notice of Publications Change. 3. Part 356 of Title 69 of the Code of Federal Regulations - Manufacturer Identification. 4. Part 567 - Certification. 5. Part 565 - Vehicles Manufactured in Two or More Stages. 6. Part 573 - Defect Reports. 7. Part 574 - Tire Identification. If you have further questions, I will be pleased to answer them. |
|
ID: nht72-5.25OpenDATE: 12/01/72 EST. FROM: Robert L. Carter; signature by Elwood T. Driver TO: Hatch Imports Inc. TITLE: FMVSR INTERPRETATION TEXT: This is in reply to your letter of December 5, 1972, concerning approvals required by the Federal Government regarding the sale of safety glazing materials. No approval by the Federal Government is required. Certification of conformance to Federal Motor Vehicle Safety Standard No. 205 is self-certification. I am enclosing a copy of Standard No. 205 and Section 114 of the National Traffic and Motor Vehicle Safety Act of 1966. If you are not aware of State approvals, you may want to contact Mr. Armand Cardarelli, of the American Association of Motor Vehicle Administrators, Suite 500, 1828 L Street, N.W. Washington, D.C. 20036. If we can be of further service, please do not hesitate to ask. |
|
ID: nht72-5.26OpenDATE: 08/31/72 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Truck Trailer Manufacturers Association TITLE: FMVSR INTERPRETATION TEXT: This is in response to your letter of August 18, 1972, enclosing threesample Certification labels. Each of the three labels contains a line for inserting the gross axle weight rating for four axles. You ask whether the lines representing intermediate axles may be deleted through the use of X's for vehicles that do not have such axles. The use of X's or similar markings to delete superfluous times is Certification labels of the type you enclose, is not prohibited by the Certification regulations. Consequently they may be used for vehicles having up to four axles. |
|
ID: nht72-5.27OpenDATE: 09/18/72 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Truck Equipment & Body Distributors Assoc. TITLE: FMVSR INTERPRETATION TEXT: With reference to your phone conversation with Mike Peskoe on September 8, I have enclosed a copy of an NHTSA opinion which concludes that a person adding a snow plow to a completed vehicle is not required to certify the vehicle. In such a case, the existing certification label should be left in place. You should note that the opinion also states that if the mounting of the snow plow causes the vehicle not to conform to any applicable motor vehicle safety standard, and the vehicle is not brought back into conformity before sale, the person mounting the plow will be violating section 105(a)(1) of the National Traffic and Motor Vehicle Safety Act, and will be subject to civil penalties and other sanctions as prescribed in sections 109 and 110 of the Act. |
|
ID: nht72-5.28OpenDATE: 02/08/72 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Oshkosh Truck Corporation TITLE: FMVSR INTERPRETATION TEXT: TEXT UNAVAILABLE |
|
ID: nht72-5.29OpenDATE: 08/21/72 FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA TO: Oshkosh Truck Corporation TITLE: FMVSR INTERPRETATION TEXT: This is in response to your letter of July 5, 1972, requesting an opinion as to how manufacturers may take into account a vehicle's speed capability in establishing GAWR. The Certification regulations do not specify particular speed criteria for establishing weight ratings. As a minimum, however, we believe the speed chosen should reflect the maximum speed at which it is reasonable to expect the vehicle to be driven. In the case where a vehicle is subject to some low-speed uses, such as seasonal use as a snow plow, we believe the figure on the certification label should be based on that use of the vehicle in which its expected speed is greatest. The regulations do not provide for variable ratings based on speed. Finally, you ask whether cautionary labels dealing with GAWR and GVWR figures may be installed in the cab. The NHTSA does not object to the use of such labels. They may be used, as appropriate, to indicate permissable use of higher loads in low-speed applications. |
|
ID: nht72-5.3OpenDATE: 05/10/72 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Garsite Products Inc. TITLE: FMVSR INTERPRETATION TEXT: We have received the pictures of the airport refuelers which you manufacture. While these pictures were received after we had mailed our letter of April 17, 1972, to you, they confirm the opinion expressed in that letter that these vehicles are motor vehicles under the National Traffic and Motor Vehicle Safety Act, and are considered to be trucks under the Federal motor vehicle safety standards. |
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.