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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 9811 - 9820 of 16510
Interpretations Date
 search results table

ID: nht80-1.36

Open

DATE: 03/18/80

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: American Mfg. & Equipment Inc.

TITLE: FMVSS INTERPRETATION

TEXT: Pursuant to the request in your February 13, 1980, letter to this office, I am enclosing an up-to-date copy of Federal Motor Vehicle Safety Standard No. 117 (49 CFR @ 571.117).

You asked about the agency's "current position with respect to Standard No. 117 as to (1) passenger tires and (2) truck tires." The requirements of this standard apply to all retreaded pneumatic passenger car tires sold in the United States. As of this date, however, neither Standard No. 117 nor any other standard applies to retreaded truck tires.

If you have any further questions regarding the requirements of the enclosed standard or any other regulations of this agency, please contact Steve Kratzke of my office (202-426-2992).

SINCERELY,

AMERICAN MFG.

& EQUIPMENT INC.

February 13, 1980

Lawrence R. Schneider Chief Counsel U.S. Department of Transportation National Highway Traffic Safety Admin.

RE: Standard No. 117 (S5.2) MV22117 Federal Retread Standard

Dear Mr. Schneider:

May I inquire as to the Department's current position with respect to the referenced standard as to (1) passenger tires and (2) truck tires.

Would you be kind enough to provide us with a copy of Federal Retread Standards also.

Thanking you in advance for any assistance you can provide.

AMERICAN MFG. & EQUIPMENT INC.

Albert P. Penter President

ID: nht80-1.37

Open

DATE: 03/18/80

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: Aeroquip Corporation

TITLE: FMVSS INTERPRETATION

TEXT: This responds to your January 17, 1980, letter asking whether the performance requirements of the parking brake sections of Standard No. 121, Air Brake Systems, permit the use of a common piston for both the service and parking brakes.

In our August 9, 1979, Federal Register notice (44 FR 46850), we stated that the performance requirements of the parking brake system must be achieved with any single leakage-type failure in the service brake system, including a ruptured diaphragm. The use of the diaphragm example was intended only to clarify a question that had been raised by a commenter to the notice proposing the parking brake amendment. The diaphragm example does not limit the requirement that any single leakage-type failure of a component of the service brake system must not affect the performance of the parking brake system.

With respect to your question, you state that a piston does not fail in the sudden manner of a diaphragm. Although this may be accurate, it is not the correct approach for interpretation of the performance requirements of the parking brake sections of the standard. If your parking brake system would comply with the requirements of the standard once the piston in the service brake system has failed, then you would be permitted to use a common piston. If, on the other hand, a failure of the service brake piston would cause the parking brake system to fail the requirements, a common piston would not be allowed.

SINCERELY,

AEROQUIP CORPORATION JACKSON, MICHIGAN 49203

January 17, 1980

Roger Tilton Office of Chief Counsel National Highway Traffic Safety Administration

Re: (Docket No. 75-16; Notice 26) FR Vol. 44, No. 155, page 46850 Thursday, August 9, 1979

Dear Mr. Tilton:

The following statement in regard to the performance of emergency-parking brakes applied by air pressure rather than by spring force appears in the subject Federal Register:

"Thus, the prescribed performance must be achieved with any type of failure in the service brake system, including a ruptured diaphragm".

This statement makes it plain that the service and emergency-parking brake systems may not share a common diaphragm.

Since it is not dealt with in the ruling and because a piston brake does not fail in the complete and usually sudden manner of a diaphragm, we are interpreting the ruling to allow the use of a common piston, assuming all requirements of the ruling are met.

Would you please confirm our assumption at your earliest convenience. You may contact me at (517) 787-8121. Thank you for your cooperation.

C. Crissy Manager, Mechanical Products

ID: nht80-1.38

Open

DATE: 03/21/80

FROM: JAMES W. LAWRENCE -- MANAGER ENGINEERING RELIABILITY & GOVERNMENT STANDARDS DEPT. WHITE MOTOR CORPORATION

TO: FRANK BERNDT -- CHIEF COUNSEL NATIONAL HIGHWAY TRAFFIC SAFETY ADMIN.

TITLE: FMVSS-115 REQUEST FOR INTERPRETATION VEHICLE IDENTIFICATION NUMBERS FOR GLIDER KITS

TEXT: Dear Mr. Berndt:

White Motor Corporation manufactures Glider Kits which are sold through its Service Department for use in rebuilding used and wrecked vehicles. FMVSS-115 does not apply to these kits because they are not new vehicles as manufactured.

There are, however, some states which allow the rebuilt vehicle to carry the identity of the kit, rather than that of the scrapped vehicle. To facilitate the registration of these vehicles, White issues a Manufacturers' Statement of Origin and a vehicle identification number. Registration as a White also provides traceability for recall should the need arise.

White believes, and requests confirmation that, although the standard does not apply to these vehicles, the standard does not prohibit the application of VIN to a Glider Kit.

ID: nht80-1.39

Open

DATE: 03/24/80

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: Lombard, Bardner, Honsowetz & Brewer

TITLE: FMVSS INTERPRETATION

TEXT: This responds to your letter of February 8, 1980, on behalf of your client, Ideal Welding and Machine Company. That company intends to market a one-piece unit coupling device for the connection of electrical and air-brake lines on tractor-trailers. You ask whether Safety Standard No. 106-74, Brake Hoses (49 CFR 571.106-74), would be applicable to this device.

The device described in your letter would not be considered a brake hose assembly or a brake hose end fitting. Rather, according to the drawings enclosed in your letter, a completed brake hose assembly with its own end fitting would be attached to the coupling device, similar to the attachment of a completed assembly to a manifold. Therefore, certification of compliance with Safety Standard No. 106-74 would not be required. This answer dispenses with your remaining questions concerning certification.

Although there are no Federal safety standards applicable to a device such as you describe, it is a piece of motor vehicle equipment. Under the National Traffic and Motor Vehicle Safety Act, as amended 1974 (15 U.S.C. 1381), a manufacturer of motor vehicles or motor vehicle equipment is responsible for any safety related defects that may exist in its products. The manufacturer would have to notify purchasers of any such safety related defects and remedy the defects at its own expense (15 U.S.C. 1411, et seq.). Therefore, your client should ascertain through testing or other means that there are no safety problems with its coupling device. Obviously, this is particularly important with any system involving vehicle braking.

Sincerely,

ATTACH.

LOMBARD, GARDNER, HONSOWETZ & BREWER ATTORNEYS AT LAW

February 8, 1980

Chief Counsel -- National Highway Traffic Safety Administration

Re: Ideal Coupling - Ruling Request Under Motor Vehicle Safety Standard No. 106-74 And Related Sections

Dear Sirs:

On behalf of my client Ideal Welding and Machine Co., a corporation organized under the laws of the State of Oregon, having its principal office at 120 Monroe Street, Eugene, Oregon, the undersigned respectfully requests that the rulings requested herein be issued on behalf of the above-mentioned party regarding the applicability of Motor Vehicle Safety Standard No. 106-74 or any related standards dealing with air-brake systems. Ideal Welding and Machine Co., which commenced business in August, 1977, is currently engaged in the business of designing and manufacturing products for industrial use. The company has designed a coupling device to be attached to the electrical and air-brake hoses of a truck and trailer which would provide a simplified one-piece unit for the connection of the electrical and air-brake lines. Arrangements have been made with Clarion Shoji Co., Ltd., of Tokyo, Japan, for the manufacture of this device. Because the device involves the connection of air-brake hoses, clarification as to the certification, labelling, and testing requirements under the Motor Vehicle Safety Standard No. 106-74 and any related sections is desired prior to the import and sale of the device in the United States.

Based on the foregoing, it is respectfully requested that the following ruling be issued:

1. The Ideal Coupling does not constitute an air-brake hose, end fitting, or assembly that requires labelling or certification under Motor Vehicle Safety Standard No. 106-74 or any related standard.

If your agency should find that some form of certification, labelling, or testing is required for the coupling device, please advise as to the following:

1. What form of label, certification, or testing is required?

2. Who is required to perform the above, i.e, the Japanese manufacturer, or may our client provide the label, certification, or testing in the United States?

If any further information is necessary, please contact the undersigned. Your prompt consideration of this matter is greatly appreciated.

Very truly yours,

Ronald A. Irvine

Under penalties of perjury, we have examined this ruling request, including the accompanying documents, and to the best of our knowledge and belief, the information presented in support of the requested ruling herein is true, correct and complete.

IDEAL WELDING AND MACHINE CO.

By: (Illegible Words) Its President

By: Sandra Dean Its Secretary

Enclosures

United States Patent [19]

Wetzig

[11] 4,183,599 [patent omitted]

ID: nht80-1.4

Open

DATE: 01/11/80

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: Blue Bird Body Company

TITLE: FMVSS INTERPRETATION

TEXT: This responds to your October 8, 1979, letter and follow-up meeting in which you ask several questions about the compliance of your school buses with Standard No. 221, School Bus Body Joint Strength. In your letter, you ask about four separate joints and ask whether they would be required to comply with the standard.

As you know, the standard applies to any joint of a body panel that encloses bus body space and a body structure member. An exception from the standard exists for those joints that connect maintenance access panels. In our meeting with you, we stated the agency's objection to the existing industry practice involving maintenance access panels, and further stated that the agency was contemplating rulemaking to restrict the maintenance access panel exception.

Responding directly to the four joints that you reference in your letter, you first ask whether the contact point between the headlining panel and the spring clip is a joint subject to the standard. A spring clip is entirely enclosed within a bus wall. Its function is to aid in holding the body panel in place while the rivets or adhesives are being applied. It serves no function beyond that. The agency does not believe that a spring clip is either a body structure member or a body panel enclosing occupant space. Accordingly, the joint of this clip and any other body member is not a joint subject to the standard.

In your second question, you ask whether the joint between the headlining panel and the headlining panel positioning tab is a joint subject to the standard. The positioning tab is a device that is approximately two inches long and contacts the headlining panel in two places between the bus body bows. The purpose of this tab, is to prevent buckling of the headlining panel between the two bows. The agency concludes that positioning tabs are body structure members. Therefore, if they contact a body panel at its edge, the intersection of these two components creates a joint subject to the standard.

Your third question asks whether an extruded aluminum sash assembly must comply with the standard. You state in your letter that this assembly is part of the window and, therefore, exempt from the requirements. The aluminum sash assembly to which you refer is an add-on device above the window found in your larger buses to provide more headroom. The agency concludes that this device has no function as a part of the window but merely is a trim panel that serves to cover part of the bus sidewall. Accordingly, the joint connecting this panel to the remainder of the bus structure would be required to comply with the standard.

Finally, you ask whether the joint between a positioning angle and a headlining panel must comply with the joint strength requirements. A positioning angle is a body structure member that runs from bow to bow and supports the edge of the headlining panel to prevent buckling. The agency concludes that this positioning angle is a body structure member and its connection with a body panel is a joint subject to the standard's requirements.

SINCERELY,

BLUE BIRD

BODY COMPANY

October 8, 1979

Frank Berndt Chief Counsel National Highway Transportation Safety Administration Department of Transportation

SUBJECT: FMVSS 221

REF: 1. Letter from Francis Armstrong to Albert L. Luce dated 6-1-79; NEF-31 MPa CIR 2087

Dear Mr. Berndt:

The subject standard requires 60% joint strength for certain defined joints on school buses; other joints, as defined in S4 of the standard, are exempted. The purpose of this letter is to seek confirmation that certain aspects of a proposed design change are exempted under the provisions of S4.

In preparation for initial compliance with the subject standard, Blue Bird Body Company redesigned the wire service panel and obtained approval for the new design; please refer to letter to and from NHTSA on February 13, 1976 and April 26, 1976 respectively.

In reference 1, NHTSA raised questions concerning our wire service panel. The questions carried no allegations of non compliance. However, in keeping with Blue Bird Body Company's philosophy of meeting the spirit of NHTSA regulations as well as the letter, we are now proposing changes to the wire service panel and surrounding components. These changes are described by the two enclosed prints.

The prints show cross sections of the proposed wire service panel design for 74" headroom and 77" headroom vehicles. The specific items with regard to this design proposal which we would like you to confirm are:

1. That the area of contact between the headlining and spring steel clip is not a joint subject to FMVSS 221 requirements. As shown on the prints, this clip is used only as an assembly aid to support headlining panels while permanent fasteners are installed. The clip will be approximately 3/4" wide. While the permanent integrity of the design is not dependent on the clip, the intent is to leave it in place after the permanent fasteners are installed.

2. That the area of contact between the headlining and the headlining panel positioning tab on the header of 74" headroom models is not a joint subject to the requirements of FMVSS 221. The purpose of the tab is to prevent the headlining from bowing outward between roof bows. The tab is shown full size on the 74" headroom print. There will be two tabs per window section.

3. That the window frame extension on 77" headroom models is exempted under the provisions of S4 where windows and body panel joints designed for ventilation are exempted.

4. That the headlining panel positioning angle on 77" headroom models is exempted. This angle performs the same function on 77" headroom models as the headlining panel positioning tabs serve on the 74" headroom models; see item 2 above.

Your early review and confirmation of these items will be appreciated. We are available for conference at your convenience to answer any questions you might have.

W. G. Milby Manager, Engineering Services

ENCLS.

ID: nht80-1.40

Open

DATE: 03/24/80

FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA

TO: O'Meara Ford Center

TITLE: FMVSR INTERPRETATION

TEXT: This responds to your February 26, 1980, letter asking about the proper certification for a Ford Mustang that has been converted to a convertible. You ask what certification is required before you would be permitted to sell such a vehicle.

The National Highway Traffic Safety Administration requires all manufacturers of motor vehicles to certify that their vehicles comply with Federal safety standards prior to first sale. In the case of the vehicle that you mention, Ford Motor Company would have certified it when it was sold to the company that converted it to a convertible. Ford's certification label is located on the driver's door or pillar post.

The company that converted the vehicle, Tomaso of America, is responsible for putting its own label on the vehicle indicating that as altered the vehicle continues to comply with the applicable Federal safety standards. The requirements for alterers' labels are located in Title 49 of the Code of Federal Regulations, Section 567.7. Tomaso's label should also be located on the vehicle in the same area as Ford's.

If both of the labels are on the vehicle, it is legal for you to sell it. If either of the labels is missing from the vehicle, then the vehicle is not correctly certified and may be in noncompliance with the safety standards.

ID: nht80-1.41

Open

DATE: 03/26/80

FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA

TO: David Williams

TITLE: FMVSR INTERPRETATION

TEXT: I would like to clarify my remarks of March 17, 1980, with respect to the applicability of Federal motor vehicle safety standards to imported vehicles.

In that letter I implied that there was a prohibition against importing cars that didn't meet Federal standards and that such vehicles had to comply with standards in effect on the date of importation. Actually, a nonconforming vehicle may be imported under bond if it will be brought into compliance within 120 days of entry with all applicable standards in effect on the date of its manufacture.

ID: nht80-1.42

Open

DATE: 03/27/80

FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA

TO: Maryland Department of Transportation

TITLE: FMVSR INTERPRETATION

TEXT: This responds to your February 8, 1980, letter asking whether it is permissible for a State to transport children to and from school on regular city transit buses. The answer to your question is yes, if the buses are on their scheduled transit routes and are transporting both school children and adults.

The National Highway Traffic Safety Administration has defined school bus in a way that allows buses sold for use as common carriers in urban transportation to transport school children without complying with school bus standards. This definition is located in Title 49 of the Code of Federal Regulations, Part 571.3. The agency permitted this exemption from the school bus safety standards in acknowledgment of the high costs involved in maintaining dual fleets of buses, one for school children and one for adults. Accordingly, the agency permitted cities with operating bus lines to transport children on those city buses. The agency also believes that joint bus fleets can help to conserve fuel.

The agency has made one restriction on the use of city buses to transport school children. The buses must be operating on their regular passenger routes and schedules and must not be operating on special school bus routes. Any vehicle that is operating exclusively as a school bus should be constructed in accordance with the school bus safety standards.

SINCERELY,

March 6, 1980

Raymond J. Salehar Highway Safety Engineer Maryland Department of Transportation Motor Vehicle Administration

Dear Mr. Solehar:

Thank you for sending HJR 21 for comments. Even though you state they would be informal, it is our practice to ask our legal department to make these comments.

I am forwarding HJR 21 to Joseph J. Levin, Chief Council, NHTSA for response.

David H. Soule Highway Safety Management Specialist Traffic Safety Programs

cc: J. J. LEVIN

Maryland Department of Transportation

Motor Vehicle Administration RAYMOND J. SALEHAR Highway Safety Engineer

David Soule:

This bill is a departure from the norm. . . . the problem is that Baltimore City is using Metro transit buses for school use by providing tickets to the students affected. They also have a small fleet of buses around the outskirts of the city and for handicapped students. These buses are painted yellow but our statute does restrict them from using flashing red lights.

Do you visualize any harm in this joint resolution?

Would appreciate your informal comments. If the commission proceeds you may be called later this year for more formal advice.

Thanks for the LPG information, your P. Aylor in Atlanta was a very information person.

HOUSE JOINT RESOLUTION No. 21

01r0067

By: Delegates Bird, Mooney, Maloney, Sheehan, Pitkin, Bainum, Scull, Simmons, Pesci, Donaldson, McCaffrey, and Cicoria

Introduced and read first time: January 17, 1980

Assigned to: Constitutional and Administrative Law

HOUSE JOINT RESOLUTION

A House Joint Resolution concerning

Dual Transportation Systems

FOR the purpose of requesting the Legislative Policy Committee to establish a commission to study the dual systems of transportation in urban areas of the State so that the yellow school bus system may be phased out wherever possible; and requiring the commission to report its findings by a certain date.

WHEREAS, The State of Maryland maintains a dual transportation system in its urban areas consisting of the yellow school bus for transportation of school children and transit buses for the general public; and

WHEREAS, Both systems are heavily subsidized by State grants to the local subdivisions of the State; and

WHEREAS, These transportation systems are too often duplicative in the services they render and inefficient in providing total transportation for the general public; and

WHEREAS, In the majority of urban areas throughout the United States, school children are encouraged to ride public transportation; and WHEREAS, The combination of public transportation and school transportation would result in substantial savings in State revenue, as well as the development of a unified and more efficient public transportation system; now, therefore, be it

RESOLVED BY THE GENERAL ASSEMBLY OF MARYLAND, That the Legislative Policy Committee is requested to establish a commission for the purpose of studying the dual transportation system in the urban areas of the State of Maryland in order to develop a plan to phase out the yellow school bus system wherever possible and to encourage school children of appropriate ages to ride public transportation to and from school; and be it further

EXPLANATION:

Numerals at right identify computer lines of text.

HOUSE JOINT RESOLUTION No. 21

RESOLVED, That the commission shall consist of three members of the House of Delegates appointed by the Speaker of the House, three members of the Senate appointed by the President of the Senate, and three members to be appointed by the Governor, one member being the designee of the Secretary of Transportation; and be it further

RESOLVED, That the commission shall make its final report to the Governor and the Legislative Policy Committee by December 31, 1981.

Maryland Department of Transportation

Office of the Secretary

DATE: 2/7/80

BILL NO.: HJR 21

COMMITTEE: CAL

SUBJECT: Phase out yellow school bus

DOT POSITION: SUPPORT

EXPLANATION: HJR 21 provides to establish a commission to study the dual systems of school bus transportation in urban areas.

COMMENT: It is recognized that this system is costly to the state because it is a dual system. Presently there are 413 yellow school busses being operated in Baltimore City. 100 are privately owned, 204 are contracted to the Department of Education and 109 are owned by the Department of Education.

The MVA supports the appointment of a select committee to study this matter and to make recommendations to combine these operations for possible phasing out of the yellow school bus operation.

For Information: Nance J. Stamboni

ID: nht80-1.43

Open

DATE: 03/27/80

FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA

TO: Great Dane Trailers Inc.

TITLE: FMVSS INTERPRETATION

TEXT: This is to confirm your telephone conversation with Mr. Schwartz of my office, in which he advised you that the manufacturer identifier referred to in Docket 1-22, Notice 10, was the manufacturer identifier required by S4.5.1 of Federal Motor Vehicle Safety Standard No. 115. Inasmuch as the Society of Automotive Engineers has already assigned a manufacturer identifier to Great Dane Trailer, Inc., this requirement has been met.

I am forwarding your complete VIN plan to the VIN coordinator as required by S6 of the Standard.

ID: nht80-1.44

Open

DATE: 04/03/80

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: Aveco Trucks of North America, Inc

TITLE: FMVSS INTERPRETATION

TEXT: This is in response to your request for an interpretation of Federal Motor Vehicle Safety Standard 101-80, Controls and Displays. You described a bulb check button which could be activated at any time by merely pushing it in, but which when released would be automatically deactivated. You asked whether the possible activation of this button at any time would take it out of compliance with section 5.3.1 of Safety Standard 101-80.

This section states that "a telltale shall not emit light except. . . during a bulb check upon vehicle starting." This provision was intended to prevent the driver from accidently leaving the bulb check control activated and thereby creating a situation where a defective functioning of the vehicle would go unnoticed by the driver. Since the bulb check control that you described cannot accidently be left in the on position since it is deactivated when the driver releases it, section 5.3.1 of Safety Standard 101-80 would not operate so as to prohibit use of this device.

I hope that you have not been inconvenienced by our delay in sending you this response.

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.