Skip to main content

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



Displaying 15671 - 15680 of 16490
Interpretations Date

ID: aiam1191

Open
Mr. Joe R. Hoag, Southwest Auto Auction Inc., 3400 South Central Avenue, Phoenix, AZ 85040; Mr. Joe R. Hoag
Southwest Auto Auction Inc.
3400 South Central Avenue
Phoenix
AZ 85040;

Dear Mr. Hoag: This is in response to your letter of July 19, 1973, concernin odometer mileage statements, which questions the circumstances under which the transferor would check the statement indicating that actual mileage differs from the odometer reading. It appears from your examples that the problem arises in the transfer of vehicle ownership to you prior to auction.; The check-off provision is intended to warn the unprofessional buyer t ask for more information when the seller has checked the box indicating that he knows that the recorded mileage is incorrect. Your first example illustrates the case of a seller who considers the recorded mileage to be very low for a car of that age but has no certain information that the mileage is wrong. He should not check the box. Your second example illustrates a seller who has reasonable grounds to know (or perhaps certain knowledge) that the odometer is on its second time around, and he must check the box. The buyer is thereby warned to ask for further information about actual mileage.; Every buyer (including an auto auction) should insist on furthe information when the box is checked, so that it can make an accurate disclosure when it resells the vehicle. In the first example the auto auction would not check the box if the previous owner had not, but in the second example the auto auction would check the box, as the previous owner had and also be prepared to offer the explanation made by the original seller.; Yours truly, Richard B. Dyson, Assistant Chief Counsel

ID: nht71-4.35

Open

DATE: 10/29/71

FROM: AUTHOR UNAVAILABLE; R. L. Carter; NHTSA

TO: Joseph Lucas (Electrical), Ltd.

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to the petition of Joseph Lucas (Electrical) Ltd. dated October 13, 1971, for rulemaking to amend Federal Motor Vehicle Safety Standard No. 108, Lamps, Reflective Devices, and Associated Equipment.

Specifically, you have asked for an amendment of paragraph S4.1.2 either to reduce the(Illegible Word) test cycle of the warpage test for backup and stop lamps from 10 minutes to 5 minutes, or to conduct the test for these lamps using a continuously flashing filament.

Petitions for reconsideration of the 10 minute heat test cycle were filed following amendment of Standard No. 108 on October 31, 1970 (35 F.R. 16840). These petitions were denied on February 3, 1971 (36 F.R. 1896), because the Traffic Safety Administration had determined that the 10-minute cycle is appropriate in view of the frequency of usage of stop and backup lamps. I enclose a copy of the denial.

The Administrator has determined that your petition contains no new information such as to merit rulemaking on this issue, and we must therefore respectfully deny your petition.

ID: nht92-4.50

Open

DATE: 08/06/92

FROM: CHRISTOPHER LEONE -- NEWBOLD DESIGN

TO: TAYLOR VINSON

TITLE: REGULATIONS FOR EXPERIMENTAL VEHICLE

ATTACHMT: ATTACHED TO LETTER DATED 11-9-92 FROM PAUL J. RICE TO CHRISTOPHER LEONE (A40; PART 555; VSA 102)

TEXT: Our company, NewBold Design, is an industrial design firm. We are in the process of designing and testing an experimental low emission vehicle which will be driven chiefly by means of electric power stored in batteries.

What we are seeking is the rules and regulations concerning the construction and licensing of this vehicle. Our goal is to create one of these vehicles, testing electric and/or electric/alternate fuel assisted vehicle ideas along the way.

Our specifications:

Experimental Vehicle (one)

2-3 passenger

Electric power

Batteries/solar cells

possible alternate fuel internal combustion assist

not for production

55 mph top speed, use on road

We need:

Rules and regulations concerning the licensing and use of the vehicle on streets/highways.

Thank you for your assistance,

ID: nht92-6.21

Open

DATE: June 2, 1992

FROM: Jeffrey Puentes -- President, Sacramento Registration Service

TO: Chief Council, NHTSA

TITLE: None

ATTACHMT: Attached to letter dated 7/13/92 from Paul J. Rice to Jeffrey Puentes (A39; Std. 115; VSA 102(4))

TEXT:

We are agents for a client who is interested in manufacturing and selling to the retail public motorcycle frames.

These frames will be used to replace various types of damaged Harley Davidsons, whether they be burned, crashed, or whatever.

What federal laws must he recognize and adhere to?

Regarding serial numbers - how will frame numbers be properly identified?

What, if any, rules must he abide by and use in order to begin this type of a retail business?

Also, please note that these frames will be made for both on and off-road use. If this affects the laws he must obey, please include that as well.

If you have any questions or concerns, please feel free to contact us here at the below listed numbers.

Thank you for your time and attention to this matter.

ID: aiam5587

Open
George E. Walton International Manufacturer's Consultants, Inc. 7618 Winterberry Place Bethesda, MD 20817; George E. Walton International Manufacturer's Consultants
Inc. 7618 Winterberry Place Bethesda
MD 20817;

Dear Mr. Walton: This responds to your July 13, 1995 letter requestin an interpretation regarding the requirements of Federal Motor Vehicle Safety Standard (FMVSS) No. 205, 'Glazing Materials.' You stated in your letter that your client wants to know if Standard No. 205 permits the use of laminated AS-1 glass in motorcycle windshields. The answer to your question is yes. ANSI Z26.1-1977, which has been incorporated by reference into Standard No. 205, explicitly refers to item 1 glazing (defined as including laminated glass) as 'Safety Glazing Material for Use Anywhere in Motor Vehicle.' Motorcycles are motor vehicles. Therefore, item 1 glazing is permitted in that application. I hope this information is helpful. Please feel free to contact Paul Atelsek of my staff at this address or by telephone at (202) 366-2992 if you have any further questions or need additional information. Sincerely, John Womack Acting Chief Counsel;

ID: aiam1150

Open
Mr. Thomas Pieratt, Truck Equipment & Body Distributors Assoc., 602 Main Street, Cincinnati, OH 45202; Mr. Thomas Pieratt
Truck Equipment & Body Distributors Assoc.
602 Main Street
Cincinnati
OH 45202;

Dear Mr. Pieratt: This is in reply to your letter of May 11, 1973, in which you ask abou the certification responsibilities for consecutive manufacturers of certain multi-stage vehicles that are intended for use by utilities. The facts as you present them are that a chassis-cab is purchased by a customer and delivered to a utility distributor, who installs a sub-base and a digger-derrick. The truck is then sent to a body-builder who installs a body consisting essentially of storage compartments, which are used to carry personal tools. The compartments are installed to the floor installed by the utility distributor. The unit is then returned to the utility distributor, who installs clearance and other lamps, reflectors, and other accessories, and hooks up hydraulic lines. Smaller vehicles are described as being manufactured in essentially the same manner.; It appears to us that the manufacturing operations you have describe fit quite readily into the manufacturing categories established by Parts 567 and 568. The utility equipment distributor is an intermediate manufacturer, he performs manufacturing operations, but does not complete the vehicle, as further manufacturing operations, the installation of the body, are clearly contemplated for the vehicle to perform its intended function. The body-builder is the final-stage manufacturer. When he completes his work the vehicle is ready to perform its intended function, except for the addition of the lighting equipment and the other operations performed by the utility equipment distributor. These latter operations appear to involve 'readily- attachable components' and if so the party performing them would not be a final-stage manufacturer.; The certification requirements do not operate differently because, i the case you describe, the utility equipment distributor performs operations on the vehicle at two separate times (installing the derrick, and later the lighting). His responsibilities each time are governed by the operation he then performs. However, inasmuch as the utility distributor appears to perform much of the heavy manufacturing, and because he is also the last person to modify the vehicle, he may wish to assume the responsibility for certification under section 568.7(b), in order that he may affix his name as the manufacturer to the certification label.; Yours truly, Richard B. Dyson, Assistant Chief Counsel

ID: aiam1151

Open
Mr. Thomas Pieratt, Truck Equipment & Body Distributors Assoc., 602 Main Street, Cincinnati, OH 45202; Mr. Thomas Pieratt
Truck Equipment & Body Distributors Assoc.
602 Main Street
Cincinnati
OH 45202;

Dear Mr. Pieratt: This is in reply to your letter of May 11, 1973, in which you ask abou the certification responsibilities for consecutive manufacturers of certain multi-stage vehicles that are intended for use by utilities. The facts as you present them are that a chassis-cab is purchased by a customer and delivered to a utility distributor, who installs a sub-base and a digger-derrick. The truck is then sent to a body-builder who installs a body consisting essentially of storage compartments, which are used to carry personal tools. The compartments are installed to the floor installed by the utility distributor. The unit is then returned to the utility distributor, who installs clearance and other lamps, reflectors, and other accessories, and hooks up hydraulic lines. Smaller vehicles are described as being manufactured in essentially the same manner.; It appears to us that the manufacturing operations you have describe fit quite readily into the manufacturing categories established by Parts 567 and 568. The utility equipment distributor is an intermediate manufacturer, he performs manufacturing operations, but does not complete the vehicle, as further manufacturing operations, the installation of the body, are clearly contemplated for the vehicle to perform its intended function. The body-builder is the final-stage manufacturer. When he completes his work the vehicle is ready to perform its intended function, except for the addition of the lighting equipment and the other operations performed by the utility equipment distributor. These latter operations appear to involve 'readily- attachable components' and if so the party performing them would not be a final-stage manufacturer.; The certification requirements do not operate differently because, i the case you describe, the utility equipment distributor performs operations on the vehicle at two separate times (installing the derrick, and later the lighting). His responsibilities each time are governed by the operation he then performs. However, inasmuch as the utility distributor appears to perform much of the heavy manufacturing, and because he is also the last person to modify the vehicle, he may wish to assume the responsibility for certification under section 568.7(b), in order that he may affix his name as the manufacturer to the certification label.; Yours truly, Richard B. Dyson, Assistant Chief Counsel

ID: nht89-1.72

Open

TYPE: INTERPRETATION-NHTSA

DATE: 04/14/89

FROM: VIRVE AIROLA -- OY TOPPI AB FINLAND

TO: NHTSA

TITLE: NONE

ATTACHMT: ATTACHED TO LETTER DATED 05/31/90 FROM STEPHEN P. WOOD -- NHTSA ACTING CHIEF COUNSEL TO VIRVE AIROLA; LETTER DATED 01/26/72 FROM RICHARD B. DYSON -- ASSISTANT CHIEF COUNSEL NHTSA TO K. NAKAJIMA -- TOYOTA

TEXT: Gentlemen;

Our company, Oy Toppi Ab, is a Finnish producer of plastic tubes and hoses. One of our most important products is Air Brake Tubing made of Polyamide PA 11. We produce this tubing both conforming to SAE J 844 and to the German standard DIN 74324.

For some time ago we quoted our tubes to the Swedish truck and bus producer Saab-Scania AB and received their product standard. Among other things this standard states following:

Quote: the manufacturer shall be registered at NHTSA in USA and the symbol DOT constituting certification by the manufacturer that the hose conforms to all applicable FMVSS standards. quote

We have no doubt that we will fullfill the requirements for the register and would appreciate it if you could send us the application formula as soon as possible.

In case any information or details are needed, please let us know and we will send them for you immediately.

Brochures [OMITTED]

ID: klein.rbm

Open

Mr. Richard H. Klein
Consulting Engineers
P.O. Box 527, Fairway Drive
Johnson, NY 10933

Dear Mr. Klein:

This responds to your letter to the National Highway Traffic Safety Administration asking about the recordkeeping obligations of a motor vehicle manufacturer under 49 CFR 574.10. I apologize for the delay in our response. You wrote on behalf of your client, the National Association of Trailer Manufacturers (NATM). You stated that you believed only tire manufacturers are required to retain records on purchasers of new tires.

49 CFR Part 574 has two separate recordkeeping requirements. Both sections have been in effect, largely unchanged, since 1971. The first, 49 CFR 574.7, applies to tire manufacturers and requires them to maintain tire registration records that they receive from tire dealers and distributors. The second section, 49 CFR 574.10, applies to motor vehicle manufacturers and requires them to maintain registration records on tires that they install on motor vehicles prior to first sale. These two recordkeeping requirements are separate requirements. Thus, NATM's members are required to keep records of all new tires they place on their motor vehicles prior to first sale subject to the requirements of 49 CFR 547.10.

I hope this information is helpful. Please contact Rebecca MacPherson of my staff at this address or by telephone at (202) 366-2992 if you have further questions.

Sincerely,
Frank Seales, Jr.
Chief Counsel
ref:574
d.3/16/00

2000

ID: nht81-1.41

Open

DATE: 03/16/81

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: Columbia Manufacturing Company

TITLE: FMVSS INTERPRETATION

TEXT:

MAR 16 1981

NOA-30

Mr. David R. Stevens Quality Control Manager Columbia Manufacturing Company Westfield, Massachusetts 01085

Dear Mr. Stevens:

In response to your recent letter, this is to advise you that the 4 mm height requirement for vehicle identification numbers (VIN) does not apply to mopeds (S4.3.1, Federal Motor Vehicle Safety Standard No. 115, 49 CFR 571.115). The letters and number used must be clear, however (S4.3). You should also be aware that if the VIN is to appear on the certification label, it must be at least three thirty-seconds of an inch high (49 CFR 567.4(g)).

Sincerely,

Frank Berndt Chief Counsel

December 29, 1980

NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION 400 Seventh Street, S. W. Washington, D. C. 20590

Attn: Mr. Fred Schwartz

Dear Mr. Schwartz:

This is to confirm our phone conversation in that we may use a 3/32 character height for our V.I.N., and that the 4 mm character height doesn't apply to mopeds.

Please find enclosed a sample of cur new V.I.N.

Sincerely,

David R. Stevens Quality Control Manager

DRS/aco

Enc.

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.

Go to top of page