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: nht78-4.27OpenDATE: 03/10/78 FROM: JAMES TYDINGS, -- THOMAS BUILT BUSES, SPECIFICATIONS ENGINEER TO: ROGER TILTON -- U. S. DEPARTMENT OF TRANSPORTATION TITLE: FMVSS #217 - SECTION 5.2, "PROVISION OF EMERGENCY EXITS". ATTACHMT: ATTACHED TO LETTER DATED 02/03/88 FROM ERIKA Z JONES TO L.T. MITCHELL; REDBOOK A31, VSA 102, SEC 571 DEFINITION; STANDARD 208, 222; LETTER DATED 08/21/87 FROM L. T. MITCHELL TO ERIKA Z. JONES RE REQUEST FOR INTERPRETATION ON FMVSS 222 ON SCHOOL BUSES WITH GVWR OF 10,000 POUNDS OR LESS; OCC-945; LETTER DATED 05/11/78 FROM JOSEPH J. LEVIN TO JAMES TYDINGS TEXT: Dear Mr. Tilton; Confirming our phone conversation of March 10, 1978, regarding the above Standard and Section. Our question revolved around the number of openings (Push-Out Windows) for a bus with wide seats (39" width) for adults. The case we cited was that the 39" seat would be used by only two adults per seat. This was for comfort reasons. Yet in reading the definition of a "Designated Seating Position" where it speaks to "at least as large as a fifth percentile adult female", the seat could provide for three females of the above size or smaller. Our contention was that our intent and that of the user was that the seat would be occupied by only two adults, and we would base our calculations upon that number to establish the number of exits. It was further discussed that there would be no intent on our part tothe safety provisions of the standard. We also suggested that we would label the vehicle seating capacity on insidevehicle in plain sight. To this you agreed, stating that it would be Trusting this is an accurate record of conversation, we shall look forward to concurrence in this matter. |
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ID: nht78-4.28OpenDATE: 05/11/78 FROM: JOSEPH J. LEVIN, JR. -- NHTSA TO: JAMES TYDINGS -- THOMAS BUILT BUSES, INC. TITLE: NONE ATTACHMT: ATTACHED TO LETTER DATED 02/03/88 FROM ERIKA Z JONES TO LT MITCHELL; REDBOOK A31, VSA 102, SEC 571; DEFINITION; STANDARD 208; 222; LETTER DATED 03/10/78 FROM JAMES TYDINGS TO US DEPARTMENT OF TRANSPORTATION RE FMVSS 217, SECTION 5.2. "PROVISION OF EMERGENCY EXITS"; LETTER DATED 08/21/87 FROM L. T. MITCHELL TO ERIKA Z. JONES RE REQUEST FOR INTERPRETATION ON FMVSS 222 ON SCHOOL BUSES WITH A GVWR OF 10,000 POUNDS OR LESS, OCC-945 TEXT: Dear Mr. Tydings: This responds to your March 10, 1978, letter asking whether you can consider a 39-inch bench-type seat in a bus as a two passenger seat when the bus is designed for adult transportation. You state in your letter that it would be possible for three 5th percentile females to sit in a seat of that width. The establishment of designated seating positions in buses and other vehicles is done by the manufacturer of the vehicles. A manufacturer is accorded some discretion in making this determination; however, he is subject to certain limitations. For example, a manufacturer cannot understate the designated seating positions to such an extent that the vehicle is likely to carry more people than its stated capacity. In other words a manufacturer must make a good faith determination of the number of designated seating positions in its vehicles. Applying this test to a 39-inch bench seat used in buses transporting adults, the National Highway Traffic Safety Administration does not consider it erroneous to consider these seats as two-passenger seats, because it would be extremely uncomfortable if not impossible to seat 3 adults in those seats. |
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ID: nht78-4.29OpenDATE: 04/13/78 FROM: JOSEPH J. LEVIN -- NHTSA CHIEF COUNSEL TO: MOE PARE -- DIRECTOR OF DESIGN CARS & CONCEPTS, INC. TITLE: NOA-30 ATTACHMT: ATTACHED TO LETTER DATED 06/26/89 FROM STEPHEN P. WOOD -- NHTSA TO MELANIE TURNER; REDBOOK A33 [2]; STANDARD 205; LETTER DATED 08/31/84 FROM FRANK BERNDT -- NHTSA TO TOYOTA MOTOR CORPORATION; STANDARD 205; LETTER DATED 11/03/88 FROM MELANIE TURNER TO ERIKA Z. JONES -- NHTSA; OCC 2777 TEXT: Dear Mr. Pare: This responds to your letter of February 16, 1978, asking whether the certification markings required on glazing materials by Safety Standard No. 205 must remain visible from the interior or exterior of a vehicle after installation. The answer to your question is no. There is nothing in the certification requirements of section S6 of Standard No. 205 that requires the markings to remain visible after installation on the vehicle. As long as the glazing manufacturer has certified and marked his glazing in accordance with the standard and as long as these markings are not removed by the vehicle manufacturer there is no prohibition against covering the markings. Sincerely, |
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ID: nht78-4.3OpenDATE: 02/02/78 FROM: AUTHOR UNAVAILABLE; John Womack; NHTSA TO: Jerome Avenue Dealers Association TITLE: FMVSR INTERPRETATION TEXT: This is in response to your letter of December 1, 1977, requesting information on the Federal odometer disclosure law. You asked whether an employee has the authority to sign an odometer disclosure statement relating to the purchase of vehicles sold dealer to dealer. Section 580.4 of Title 49, Code of Federal Regulations, requires each transferor of a motor vehicle to furnish to the transferee a written statement of the mileage traveled by the vehicle. "Transferor" is defined as "any person who transfers his ownership in a motor vehicle by sale, gift, or any means other than by creation of a security interest." In a dealer-to-dealer transaction, as in all other transactions, the owner of the vehicle is responsible for signing the disclosure statement. He may assign that responsibility to an employee or representative. The transferor, however, as the owner of the vehicle, nevertheless remains liable for the actions of his employee. You also raised the question in your telephone call of January 18, with Kathy DeMater of my staff, whether in a wholesale transaction all vehicles could be listed on one invoice as long as separate disclosure statements are issued for each. The National Highway Traffic Safety Administration is concerned with the issuance of correct mileage statements for each vehicle and does not have any objection to all the vehicles being listed in one invoice. The sample "Odometer Statement" which you enclosed with your letter meets all of the requirements of the Federal regulation. Thank you for your cooporation in preparing the revised statements. |
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ID: nht78-4.30OpenDATE: 06/09/78 FROM: LAWRENCE W. HENNEBGERGER; ROBERT L. GREEN -- ARENT FOX TO: JOSEPH J. LEVIN -- CHIEF COUNSEL NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION COPYEE: Z. TAYLOR VINSON, GERALD M. BLOOM; JOSEPH WALSH, ROBERT BRENNER TITLE: NONE ATTACHMT: ATTACHED TO LETTER DATED 08/31/78 FROM JOSEPH J. LEVIN -- NHTSA TO LAWRENCE F. HENNEBERGER AND ROBERT W. GREEN; REDBOOK A26(3); STANDARD 108 TEXT: Dear Mr. Levin: Our client, Jacobs Manufacturing Company, has manufactured and distributed its well-known diesel engine retarder (the "Jake brake") for a number of years. The Jake R brake is sold both in the OEM market as original engine equipment (by such companies as Cummins Engine Co. and Mack Truck, among others) and as an aftermarket installation. This retarder provides auxiliary retarding capabilities independent of the vehicle's foundation brakes and perm[Illegible Words] a heavy truck to travel at normal traffic speeds on long downgrades, under full control, as well as extending the service life of the foundation brakes. In recent years, the retarding force generated by current-design engine retarders has increased considerably, and electric driveline retarders with markedly greater retarding horsepower have become available. For example, Jacobs is now marketing an electric retarder (the "Jake ERR"), rated at some two to three times the retarding force of a typical large diesel engine equipped with the Jake R brake. Because retarding forces of this magnitude are capable of producing significant deceleration of a large truck so equipped, Jacobs believe that some means should be provided to warn following vehicles when a retarder is in use. In addition, since a truck tractor equipped with a retarder may be used to pull a variety of different semi-trailers, the warning system must utilize existing vehicle equipment and operate both on the tractor alone ("bob-tail" configuration) and with any semi-trailer that may be hooked up. After careful analysis and based upon a meeting with NHTSA and BMCS representatives on June 6, 1978, Jacobs has concluded that use of the existing hazard warning flasher system would best provide such warning to following drivers. Many states now require trucks moving less than 40 m.p.h. on limited access highways to use their hazard warning flashers to alert other motorists that they are slow-moving. In order to provide this retarder warning signal automatically, Jacobs proposes to connect the retarder activation switch to the hazard warning system when a retarder is installed, either at the OEM or aftermarket level. Accordingly, the Company requests an advisory opinion that such use and connection of the hazard warning system is permissive and will not violate the requirements of FMVSS 108, nor will it violate the "antitampering" provisions set out in section 108 (a) (2) (A) of the National Traffic and Motor Vehicle Safety Act of 1966, as amended. Sincerely, |
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ID: nht78-4.31OpenDATE: 08/19/78 FROM: FRANK BERNDT -- ACTING CHIEF COUNSEL, NHTSA TO: WILLIAM K. ROSENBERRY -- ATTORNEY AT LAW TITLE: NONE ATTACHMT: LETTER DATED JULY 14, 1976 TO GEORGE SHIFFLET, NHTSA, FROM WILLIAM K. ROSENBERRY IS ATTACHED. TEXT: This is in reply to your letter of July 14, 1976, to George Shifflett of the Office of Standards Enforcement, on behalf of a client who intends to install a different type of seat, carpeting, and headliner in a pick-up truck, which would then be sold to the general public. You asked whether a fabric supplier must test each fabric lot for flammability before certification to Motor Vehicle Safety Standard No. 302 can be given, and whether your client (Illegible Word) reply on the warranty of a fabric manufacture that the fabric sold meets the requirements" of Standard No. 302. You are correct in your understanding that the provisions of the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1381 et seg) apply to your client. His basic responsibility is to ensure that the vehicles he modifies are in compliance with the Federal standards when delivered to dealers for sale to the public. (15 U.S.C. 1397 (a) (1) (A)) A temporary noncompliance during modifications is permissible if the vehicle is not used on the public roads while noncompliant (15 U.S.C. 1397 (a) (2) (A)). Standards which would appear to be affected by your client's modifications include: Standard No. 207 Seating Systems. No. 208 Occupant Crash Protection, No. 210 Seat Belt Assembly Anchorages and No. 302 Flammability of Inferior Materials. As a person who alters a certified vehicle other than by the addition of readily detachable components, your client is also required to attach his own certification of compliance to each modified truck (49 CFR 567.7). Should a noncompliance be discovered as a result of an alterer's modification, the alterer would be liable for a civil penalty unless he could establish that he did not have actual knowledge of the noncompliance, and that he did not have reason to know in the exercise of due care that the vehicle did not comply (15 U.S.C. 1397 (b) (2). With respect to Standard No. 302, there is no requirement that a fabric supplier "test each fabric lot for flammability before certification." In point of fact, 49 CFR 571.302 Motor Vehicle Safety Standard No. 302 does not apply to suppliers but only to vehicle manufacturers (or alterers) and it is they who are required to certify compliance with Standard No. 302. Generally, at a minimum, a vehicle manufacturer will require by contract with the supplier that the fabric meets Standard No. 302. In the exercise of "due care" the manufacturer may wish to examine the basis for the supplier's assurance of compliance, and to require periodic testing of the fabric being supplied him. Since there is no requirement that each fabric lot be tested, such testing as is conducted should be sufficient to demonstrate in the event of a noncompliance that the vehicle manufacturer has exercised due care. As to whether your client may rely on the "warranty" of his supplier, it has been our experience that simple reliance is insufficient to establish a "due care" defense. That manufacturer should examine the supplier's test results to insure that the margin of compliance of the test fabric is great enough that production variables do not result in noncompliance. Some manufacturers even conduct their own tests independent of the supplier. Your client would also be responsible for conducting a notification and remedy campaign (15 U.S.C. 1411 et seg) if a noncompliance or safety-related defect occurs in the truck as a result of the alterations. I enclose copies of the Act, 49 CFR Part 567, and Standards Nos. 207, 208, 210, and 302 for your information. Enclosures |
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ID: nht78-4.32OpenDATE: 10/05/78 FROM: JOSEPH J. LEVIN -- CHIEF COUNSEL, NHTSA TO: CHARLES B. HONEYCUTT -- DIRECTOR OF PUPIL PERSONNEL GLASGOW INDEPENDENT SCHOOLS TITLE: NONE TEXT: This responds to your July 13, 1978, letter asking whether you may use a 12 Passenger van to Transport 9 cheerleaders to basketball games. This van does not comply with the school bus safety standards. If the van to which you refer was manufactured prior to April 1, 1977, then it may be used to transport school children. The new school bus safety standards became effective on that date and, therefore, do not apply to vehicles manufactured prior to that date. Any vehicle manufactured on or after that date designed to carry more than 10 persons and which is sold to transport school children to or from school or related events must comply with all of the school bus safety standards. These vehicles must comply with the standards regardless of the fact that a user might not transport more than 9 students in the vehicle. A dealer is in violation of the law if it knowingly sells to a school a vehicle that was manufactured on or after April 1, 1977, that is to be used to transport school children, and that does not comply with the school bus safety standards. Such violation is punishable by a fine of up to $ 1,000. If your van was manufactured on or after the effective date, we suggest that you arrange with the dealer to repurchase the van. If the dealer refuses, please notify us and we will take appropriate action. |
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ID: nht78-4.33OpenDATE: March 27, 1978 FROM: Joseph J. Levin, Jr. - Chief Counsel, NHTSA TO: Bill Nanninga -- Division of Planning, Wisconsin Department of Transportation TITLE: None ATTACHMT: Attached to letter dated 8-3-77 from J.J. Levin, Jr. to J.L. O'Connell (VSA 102(14)); Also attached to letter dated 7-12-77 from J.J. Levin, Jr. to J. Thomason (VSA 102(14)); Also attached to letter dated 9-10-90 from P.J. Rice to E. Kultgen (A36; VSA 108(b)(1)); VSA 102 (14); Part 571.3); Also attached to letter dated 5-29-90 from E. Kultgen to S.P. Wood (OCC 4843); Also attached to letter dated 5-10-82 from F. Berndt (signature by S.P. Wood) to M.V. Chauvin TEXT: This confirms your March 13, 1978, conversation with Roger Tilton of my staff concerning the applicability of the Federal school bus safety standards to buses designed to transport handicapped adults or other adults to training or rehabilitation facilities. Such vehicles are not considered school buses for purposes of the application of Federal school bus safety standards and would not have to comply with those standards. You indicated that a state law requires that these buses be labeled school buses although they are not painted school bus yellow nor used to transport school children to and from school or related events. The National Highway Traffic Safety Administration (NHTSA) discourages the use of the label school bus on vehicles that are not used to transport school children. Further, although the agency would not consider these vehicles to be school buses and would not require their compliance with school bus safety standards, you will probably find very few manufacturers who are willing to mark a bus as a school bus without manufacturing it in compliance with the standards, because the use of such a vehicle as a school bus would subject the manufacturer to liability. |
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ID: nht78-4.4OpenDATE: 02/02/78 FROM: AUTHOR UNAVAILABLE; John Womack; NHTSA TO: Eagle Equipment Company TITLE: FMVSR INTERPRETATION TEXT: Our Regional Office in San Francisco has forwarded to us for reply your request for an interpretation of 49 CFR Part 580, Odometer Disclosure Requirements. The question you raised is who executes the odometer statement when the vehicles are owned by and registered in your name, but turned over to a leasing company who in turn sells the vehicles. Section 408 of the Motor Vehicle Information and Cost Savings Act requires each transferor of a motor vehicle to issue an odometer disclosure statement to each transferee. The transferor is defined in 49 CFR Section 580.3 as "any person who transfers his ownership in a motor vehicle . . . " Therefore, you as the owner of the vehicle are required to execute the statement. However, since you never see the vehicles, but rely on the leasing company to sell them for you, you may also rely on the leasing company to act as your agent and execute the odometer statements for you. Since you are the legal owner of the vehicles, it is your responsibility to execute the statements. If you are concerned about the possiblity that thee leasing company may alter the odometer or make an improper disclosure, you may find it advisable to protect yourself by requiring the leasing company to indemnify you in the event of liability under the Act. |
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ID: nht78-4.5OpenDATE: 05/10/78 FROM: AUTHOR UNAVAILABLE; Joseph J. Levin Jr.; NHTSA TO: The Barbour House TITLE: FMVSR INTERPRETATION TEXT: This responds to your January 12, 1978, letter asking several questions concerning the applicability of the Federal safety standards to vehicles that are being reconstructed with new chassis. The answers to your specific questions are set forth below. 1. You ask whether the replacement of the engine, transmission, drive train, rear end, frame, front axle, front brakes, wheels, and steering box constitutes the manufacture of a new chassis requiring a new or upgraded body. The answer to your question is yes. Part 571.7(e) of Volume 49 of the Code of Federal Regulations specifies the items that must be retained in a truck chassis in order that such chassis be considered used. These same considerations apply to reconstructed school buses since they are built on truck chassis. 2. You ask what parts of a chassis must be retained to ensure that the vehicle could continue to utilize an old body that does not comply with current Federal safety standards. Part 571.7(e) states that, at a minimum, the engine, transmission, and drive axle(s) must be retained. 3. You ask who must certify a remanufactured vehicle if its chassis is considered old or new. In the case of an old chassis that retains the required components and is therefore considered used, no certification is required of any repair business. In the case of a remanufactured chassis, the chassis manufacturer must certify his chassis for compliance and the shop that installs the body must certify the final compliance of the vehicle. 4. Part 568.8 states that vehicles altered before the first purchase for purposes other than resale must be labeled with an alterer's label. When a new chassis is installed in a vehicle, this is not an alteration, but rather, it is the manufacture of a new motor vehicle. Therefore, section 568.8 would not apply. The other provisions of Part 568 relating to the manufacture of a new motor vehicle would apply to this reconstructed vehicle. The person undertaking the remanufacture would be treated like the original manufacturer of the vehicle and would be required to certify it for compliance with the standards. 5. Standards promulgated after 1975 that are specifically applicable to school buses are: Standard No. 217-76, Bus Window Retention and Release, Standard No. 220, School Bus Rollover Protection, Standard No. 221, School Bus Body Joint Strength, Standard No. 222, School Bus Passenger Seating and Crash Protection, and Standard No. 301-75, Fuel System Integrity. Many of the other safety standards apply to school buses as well as other vehicles. I am enclosing a sheet detailing the applicability of Federal safety standards. All Federal safety standards are located in Volume 49 of the Code of Federal Regulations, Part 571. By examining the standards in Part 571, you can ascertain when their most recent amendment has occurred. |
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.