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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.”

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NHTSA's Interpretation Files Search



Displaying 11781 - 11790 of 16517
Interpretations Date

ID: nht76-5.15

Open

DATE: 11/10/76

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: Triplex Safety Glass Co.

TITLE: FMVSS INTERPRETATION

TEXT: This is in response to your September 8, 1976, letter requesting information concerning the Federal regulations that would be applicable to safety glazing for use in "slow moving" vehicles. Please excuse our delay in answering your questions. Apparently, your earlier letter of February 5, 1976, was misplaced.

Standard No. 205, Glazing Materials, specifies requirements for glazing materials for use in most motor vehicles and motor vehicle equipment. A glazing manufacturer must certify any glazing that is to be used in a motor vehicle (other than a trailer) as being in compliance with Standard No. 205. "Motor vehicle" is defined in @ 102(3) of the National Traffic and Motor Vehicle Safety Act of 1966. I am enclosing a copy of the agency's opinion of what vehicles qualify as "motor vehicles" under the definition. Glazing material that is to be used in a vehicle that does not qualify as a "motor vehicle" does not have to meet the performance requirements of Standard No. 205.

Sincerely,

Enclosure

ATTACH.

SEPTEMBER 8, 1976

Triplex Safety Glass Co Ltd

Robert L. Carter -- Associate Administrator, Motor Vehicle Programs, U.S. Department of Transportation, National Highway Traffic Safety Administration,

Dear Mr. Carter,

On 5th February 1976 I wrote to the Department of Transportation requesting information on possible regulations in the U.S.A. governing the safety glazing to be fitted in slow moving vehicles. To date I have not received a reply. It may be that the letter was lost in the post and I, therefore, enclose a copy.

I realise, of course, that this query is probably nothing to do with your department, but I would be grateful if you could either forward it to the correct authority or alternatively let us have the address of this authority in order that we can write to them ourselves.

Yours sincerely,

MISS VALERIE HOOD -- Standards Department

FEBRUARY 5, 1976

The Administrator -- National Highway Traffic Safety Administration, U.S. Department of Transportation,

Dear Sir,

SLOW MOVING VEHICLES

Can you please let us know what regulations, if any, govern the type of safety glazing which must be fitted in slow moving vehicles (i.e. vehicles with a maximum speed of 20-25 km/h) in the U.S.A. These vehicles are usually agricultural or forestry vehicles, etc. which might go on a public road for short periods.

Our understanding of U.S. National Traffic and Motor Vehicle Safety Act 1966 and F.M.V.S.S. 205 are that neither covers such vehicles. The former describes a motor vehicle as "any vehicle driven or drawn by mechanical power manufactured primarily for use on public streets, roads and highways" and the latter applies only to passenger cars, multi-purpose passenger vehicles, trucks, buses, motor cycles, slide-in campers and pick up covers.

If the above query does not come within your jurisdiction, we would be grateful if you would forward our letter to the correct authority.

Yours faithfully, TRIPLEX SAFETY GLASS COMPANY LIMITED;

MISS VALERIE HOOD -- Standards Department

ID: nht76-5.16

Open

DATE: 05/19/76

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: R. A. Olsen, Ph.D.

TITLE: FMVSS INTERPRETATION

TEXT: This responds to your March 26, 1976, question whether Federal motor vehicle safety standards would apply to the replacement of seat belt webbing in seat belt assemblies to refurbish deteriorated portions of the webbing.

The National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1381, et seq.) authorizes the National Highway Traffic Safety Administration (NHTSA) to regulate the manufacture, but not the repair, of motor vehicle equipment such as seat belt assemblies. The NHTSA has issued a standard that applies to the manufacture and sale of seat belt assemblies (Standard No. 209, Seat Belt Assemblies (49 CFR 571.209)). In enforcement of this standard, the agency must, therefore, distinguish between what is "repair" and what is "manufacture" of a seat belt assembly.

You intend to accept existing seat belt assemblies from vehicle owners and to replace the webbing portions, reusing the hardware that is recovered from the existing assembly. From this description, the agency considers that the operation would constitute the manufacture of a seat belt assembly subject to the requirements of Standard No. 209. The majority of the assembled product would be new material, and the manufacturing operations involved in cutting and sewing constitute significant factors in the construction of the finished product.

SINCERELY,

RICHARD A. OLSEN, Ph.D. Engineering Psychologist

Licensed Psychologist: Pa. #PS0235 Member: APA, PPA, HFS, IEEE, SAE

March 26, 1976

Robert L. Carter Associate Administrator for Motor Vehicle Programs National Highway Traffic Safety Admin. U.S. Department of Transportation

We have been considering establishing a mail-order firm specializing in replacement of the webbing of seat belt assemblies. As you may know, belt replacements through automobile dealers may cost $ 15-20 per assembly, while the webbing, which is the only component that deteriorates, could be supplied for about $ 1-2. By reuse of the hardware and quick turnaround times, stocking only the most common assemblies and allowing trade-ins, this service could expand as the demand increases and keep the cost low.

We would like an opinion from NHTSA on the standards which might be involved in such a service. Specifically, if webbing, assembly, and sewing are comparable to original equipment, would any testing for final assembly strength be required? We assume that reasonable workmanship would be sufficient if standard components and procedures are used. Any extensive testing or certification requirements would preclude initiation of this service firm since very small initial volumes would be anticipated, and cost must be kept low to cover labor, postage, and supplies.

We feel that the public is beginning to appreciate the value of seat belts, partly as a result of the interlock which demonstrated that the belts themselves "weren't so bad after all." Now there needs to be a way to replace frayed belts at a price that is not a strong deterrent.

Richard A. Olsen

ID: nht76-5.17

Open

DATE: 11/10/76

FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA

TO: E. D. Etnyre & Company

TITLE: FMVSR INTERPRETATION

TEXT: This is in belated response to your letters of June 22, 1976, concerning the availability of NHTSA interpretation letters and the assignment by vehicle manufacturers of Gross Axle Weight Ratings.

Letters written by this agency that interpret the Federal Motor Vehicle Safety Standards or accompanying regulations are regularly compiled by standard or regulation number and placed in a public file (the "redbooks") in the Docket Section at Room 5108, 400 Seventh Street, S.W., Washington, D.C. Copies of these letters are distributed informally by various trade associations, as you have noted. However, there is currently no subscription service available directly from the NHTSA. I recommend that you periodically (bimonthly, perhaps) telephone the Docket Section (202 426-2768) to find out whether entries have recently been made in the Redbooks under the standards and regulations that are of particular concern to you.

You have also asked several questions concerning the relationship between an axle's Gross Axle Weight Pating (GAWR) and the overloading of that axle when the vehicle is in use. GAWR is defined in 49 CFR 571.3 as

the value specified by the vehicle manufacturer as the load-carrying capacity of a single axle system, as measured at the tire-ground interfaces.

It is thus a rating assigned by the manufacturer at the time of manufacture. A vehicle whose axle weight ratings are likely to be exceeded under the manufacturer's intended or reasonably forseeable conditions of usage would probably be considered to contain a safety-related defect. Such a vehicle would be subject to the notification and remedy provisions of the National Traffic and Motor Vehicle Safety Act of 1966, as amended (15 U.S.C. 1392 et seq.).

We cannot prescribe specific steps that a vehicle manufacturer must take to ensure that a GAWR would not be found so low that it would be a safety-related defect. For example, if a warning in the owner's manual against loading in a certain manner is likely to be ignored, then such a warning would not, by itself, be sufficient. The NHTSA expects the vehicle manufacturer to take reasonable steps, short of retraining from production, to minimize the likelihood of vehicle misuse through overloading.

SINCERELY,

E.D. ETNYRE & CO.

June 22, 1976

U.S. Department of Transportation Legal Counsel - NHTSA This matter refers to Part 567 "Certification" and Part 568 "Vehicles Manufactured in Two or more Stages" of 49CFR.

Many of the interpretations and comments dealing with "rated loads" refer to the circumstance of exceeding the Gross Vehicle Weight Rating (GVWR). However, the certification label also requires that the Gross Axle Weight Rating (GAWR) also be noted. We have not as yet seen any question or interpretation dealing with the matter of overload on an axle. Our questions then are as follows.

1. Assume a tank type motor vehicle; which when loaded full to its rated cargo load; expressed as a volume of a specific commodity. (i.e., water); does not exceed the GVWR rating but the load is distributed such that a GAWR is exceeded. Is this a violation of the regulations?

2. Assume the same type vehicle loaded with a material whose specific weight varies over a limited range but does have an average acceptable value for general use (i.e. asphalt). If a GAWR is exceeded is this a violation of the regulations?

3. Assume a vehicle as in paragraph 2, constructed of compartments for variable commodities and designed for a specific loading arrangement. If the loading arrangement is not followed by the user and the GAWR is exceeded but not the GVWR, is the manufacturer liable?

4. Assume a vehicle as in paragraph 1, which is loaded full by the user with a material heavier than specified and designed for by the manufacturer and both the GVWR and GAWR are exceeded, is the manufacturer liable?

5. If a volumetric load of specific weight is considered by the manufacturer in rating the vehicle, what steps are necessary to protect the manufacturer from alleged violations of rating if other commodities are carried?

Jackson Decker Chief Product Engineer

E.D. ETNYRE & CO.

June 22, 1976

U.S. Department of Transportation Legal Counsel - NHTSA

We have become aware of the process whereby interpretation to paragraphs of Parts of 49CFR (particularly Parts 567, 568 and 571) are distributed on an informal basis through various trade associations. We further note that they apparently are carried in your files under the designation of "N40-30".

Since our activities are not completely served by any one particular association and we are not prepared to join a multitude of associations, is there a compilation of interpretations which are available from NHTSA on a regular or subscription basis? If there is such a service we would appreciate hearing about it. If not, how do we assure ourselves that interpretations which are being made on matters of common concern are made available to us so that we can comply with these interpretations?

Jackson Decker Chief Product Engineer

ID: nht76-5.18

Open

DATE: 03/09/76

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Wenke; Burge & Taylor

TITLE: FMVSR INTERPRETATION

TEXT: This is in response to your February 10, 1976, letter concerning the determination of Gross Vehicle Weight Rating (GVWR) and Gross Axle Weight Rating (GAWR) for boat trailers.

You have presented the following two examples:

GVWR -- 3300; GAWR -- 2970 and

GVWR -- 3000; GAWR -- 2700.

Assuming that 10 percent of the trailer's loaded weight is carried by the towing vehicle, each example reflects a permissible relationship between the GVWR and the GAWR. Your letter indicates that your client presently provides a GVWR figure of 3000 pounds,

based on the load carrying capacity determined when the trailer is not connected to a towing vehicle.

If by this you mean that the boat trailer's axle system has a load carrying capacity of 3000 pounds, then the trailer would actually be entitled to a GAWR of 3000 pounds and a GVWR of 3333 pounds. Your client is free, of course, to establish more conservative load ratings. However, the GAWR should not be less than 9/10 of the accompanying GVWR.

Yours truly,

ATTACH.

WENKE, BURGE & TAYLOR

February 10, 1976

Richard B. Dyson, Esq. Assistant Chief Counsel National Highway Traffic Safety Administration

Re: Your File No. N40-30

Dear Mr. Dyson:

Thank you for your letter of January 15, 1976 concerning the determination of Gross Vehicle Weight Rating (GVWR) and Gross Axle Weight Rating (GAWR) for a boat trailer.

I want to confirm with you my understanding of your letter by an example so that I can be certain I am properly advising my client. The trailers manufactured by my client presently provide a certification that provides a GVWR figure based on the load carrying capacity determined when the trailer is not connected to a towing vehicle. That is, a typical trailer would carry ratings as follows: GVWR - 3000; GAWR - 3000. Assuming, for example, that 10% of the trailer weight and load is carried by the towing vehicle, it would appear that my client is presently providing a GAWR higher than necessary. Can the label be changed to reflect a lower GAWR in either of the following ways:

GVWR - 3000

GAWR - 2700 or

GVWR - 3300

GAWR - 2970

Thank you for your consideration and please call me collect at the above number if you should have any questions regarding this matter.

Very truly yours, John F. Evans

ID: nht76-5.19

Open

DATE: 12/13/76

FROM: R. L. CARTER FOR JOHN W. SNOW -- NHTSA

TO: Department of Education; New Jersey

TITLE: FMVSR INTERPRETATION

TEXT: This is in reply to your letter of September 9, 1976, requesting information on the legal aspects of the change in the definition of "school bus."

Effective April 1, 1977, the definition of "school bus" in Title 49 of the Code of Federal Regulations (49 CFR @ 571.3) will read as follows:

"School bus" means a bus that is sold or introduced in interstate commerce, for purposes that include carrying students to and from school or related events, but does not include a bus designed and sold for operation as a common carrier in urban transportation.

The definition of "bus" will continue to read as follows:

"Bus" means a motor vehicle with motive power, except a trailer, designed for carrying more than 10 persons.

The new definition of school bus will include many of the van-type vehicles that are classified as Type II school vehicles under Highway Safety Program Standard No. 17. If a Type II van is designed to carry more than 10 persons, and it it is sold for purposes that include "carrying students to and from school or related events," it will have to be sold with all the equipment specified for school buses by the Federal Motor Vehicle Safety Standards. It will therefore have to have school bus lights as specified by the standard on lighting (49 CFR @ 571.108).

Our experience with the comparative accident patterns of Type I and Type II buses does not justify the use of different lighting systems for the two types. In view of Congress's expressed desire to have the school bus standards uniformly applicable to buses of all sizes, we consider it appropriate to apply the lighting standard to all school buses.

We understand your concern with the effects that the newly applicable requirements will have on your purchase of Type II vans. However, we are persuaded that the requirements are reasonable and that they will protect school children.

If we can be of further assistance, please let us know.

ID: nht76-5.2

Open

DATE: 08/31/76

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: Volvo of America Corporation

COPYEE: ALLIED CHEMICAL CORP.; U.S. TESTING CO., INC.

TITLE: FMVSS INTERPRETATION

TEXT: This is in response to your April 6, 1976, request for interpretations regarding certain sections of Safety Standard No. 209, Seat Belt Assemblies, when applied to the continuous loop seat belt assemblies provided on current Volvo vehicles.

Paragraphs S4.4(b)(1) and (2) specify performance requirements for components in the pelvic restraint and upper torso restraint portions of a belt system, tested separately and in combination. You ask for verification of your interpretation that the requirements for separate testing of pelvic and upper torso portions are inapplicable to a continuous loop seat belt, on the basis that this type system "can never in real life be subjected to forces only in the pelvic restraint." Your letter includes an illustration of your test apparatus for determining compliance with paragraph S4.4(b), and you request verification that your procedure is correct.

Section S5.3(b) of the standard sets forth the test methods that would be used in a determination of whether a Type 2 seat belt assembly conforms to the requirements of S4.4(b). Paragraph S4.4(b)(1) specifies that the pelvic restraint shall withstand a force of not less than 2,500 pounds, and S4.4(b)(2) specifies that the upper torso restraint shall withstand a force of not less than 1,500 pounds. The Volvo continuous loop belt systems are subject to these requirements. A recent NHTSA interpretation letter to Toyo Kojyo (copy enclosed) on the same subject sets forth the responsibilities of the manufacturer in cases where the specified test procedures may not be entirely suitable to a new safety component design. In testing continuous loop belt systems for compliance with S4.4(b)(1) and (2), the agency has interpreted S5.3(b) to necessitate the use of a clamp in the same fashion as suggested by Toyo Kojyo to ensure that the force is applied to the appropriate portion of belt webbing and hardware. It must be understood, of course, that the NHTSA cannot approve a manufacturers's test procedure as the basis of due care in advance of the actual events that underlie certification. It is impossible for the agency to foresee whether the various aspects of a particular test procedure will be conducted in a proper fashion, based solely on a written description of that test procedure.

In the second part of your letter you asked whether the buckle crush requirements of paragraph S4.3(d)(3) of Standard No. 209, when tested in accordance with the procedures specified in S5.2(d)(3), are applicable to Volvo seat belt buckles and, if so, whether Volvo's interpretation as to how the test should be conducted is correct.

It is true that the buckle requirements were originally included in the standard to guard against possible damage to the buckle caused by the steering wheel in a crash situation. Since the issuance of the standard, new seat belt assembly designs have been developed in which the belt buckle is located between the front seats. As you pointed out in your letter, these buckles are not likely to be contacted by the steering wheel in a crash situation.

In view of the significant design changes that have occurred, the agency has reconsidered its 1972 interpretation to United States Testing Company on this subject. Because it is unlikely that any of these buckles would be damaged by compressive forces in a crash, we have determined that the requirements are inappropriate. Therefore, we conclude that the existing S4.3(d)(3) buckle requirements are not applicable to buckles that are located between bucket seats and attached to the console or to the end of a rigid cable or bar.

SINCERELY,

April 6, 1976

Frank Berndt, Acting Chief Counsel National Highway Traffic Safety Administration

Re: Interpretation of FMVSS 209 Demonstration Procedures

FMVSS 209 - Seat Belt Assemblies, specifies in detail performance requirements which must be met by automotive seat belt assemblies. The manner in which conformance with these requirements is to be demonstrated is outlined in S5 of FMVSS 209. Both the performance requirements and the demonstration procedures reflect the design characteristics of those types of seat belt assemblies commonly in use when the standard was written. We have experienced difficulty in applying these requirements to the single loop type seat belt assembly employed on current Volvo vehicles.

Attached are a discussion of section S4.4(b) and a discussion of sections S4.3(d)(3) and S5.2(d)(3) of FMVSS 209 outlining our interpretation of how the requirements of FMVSS 209 apply to single loop type seat belt assemblies. Also attached are illustrations of the Volvo single loop seat belt assembly. Your verification that our interpretation of FMVSS 209, as stated in the attached discussions, is consistent with the requirements of FMVSS 209 would be appreciated.

Any questions on this matter may be addressed to the undersigned. Thank you for your prompt consideration of this request.

VOLVO OF AMERICA CORPORATION Product Engineering and Development

Donald J. Gobeille, Jr. Product Safety Engineer

Request for Interpretation FMVSS 209 S4.3(d)(3) and S5.2(d)(3)

S5.2(d)(3) specifies that a seat belt buckle shall be subjected to a compressive force of 400 pounds applied ". . . anywhere on a test line that is coincident with the centerline of the belt extended through the buckle . . ." (alternative 1) or ". . . on any line that extends over the center of the release mechanism and intersects the extended centerline of the belt at an angle of 60 degrees . . ." (alternative 2). The requirements which shall be met, when tested in this manner, are found in S4.3(d)(3).

The intent of these requirements is expressed in Docket 69-23, Notices 1 and 2, published on March 17, 1970 (35 F.R. 4641) and on March 10, 1971 (36 F.R. 4607), respectively, where it is stated that the test will tend to eliminate buckle designs which are prone to accidental damage, or which release during the initial phase of the accident.

For a design where the buckle is rigidly mounted on the floor between the front seats (see attached description), its location protects it from accidental damage and from release during the initial phase of an accident. It is our interpretation that if the buckle crush requirements are at all applicable to buckles of this design and location, they shall be tested in accordance with alternative 1 above and the force shall be applied as indicated on the attached description. The basis for this interpretation is that the only damage which may occur results from compression if the seats are displaced as a result of a side impact, where the protective effect of a belt in any case can be discussed.

Therefore we request you to:

(1) state if the buckle crush requirements of S4.3(d)(3), when tested in accordance with S5.2(d)(3), are applicable to the described type of buckles, and

(2) if so, if our interpretation as to how this test shall be conducted is correct.

Request for Interpretation FMVSS 209 S4.4(b)

S4.4(b) specifies requirements for Type 2 seat belt assemblies. S4.4(b)(1) and (2) specify requirements for components in the pelvic restraint and in the upper torso restraint, respectively. Then S4.4(b)(3) specifies requirements for components which are common to pelvic and upper torso restraints.

A Type 2 seat belt assembly which is designed as a continuous loop seat belt with a sliding locking tongue, can never in real life be subjected to forces only in the pelvic restraint. Therefore we interpret S4.4(b)(1) and (2) as not directly applicable to such a design of seat belts. Only S4.4(b)(3) should apply, which indirectly covers the same aspect of performance. The maximum elongation requirements of S4.4(b)(4) and (5) can be met by limiting the double-roller block travel to 10 inches when the 6000 pounds force is applied.

The breaking strength requirement of S4.4(b)(6) for a webbing cut of the pelvic restraint should be applicable to any webbing cut in a continuous loop seat belt.

In accordance with our interpretation, a continuous loop seat belt assembly should be tested as indicated in the following figure:

As can be seen from this figure, the test set up includes all attachment hardware, and the positions of the components simulate as close as possible their actual positions in a vehicle.

We request that you confirm our interpretation as stated above.

(Graphics omitted) Part of drawing No 1290538

(Graphics omitted)

ID: nht76-5.20

Open

DATE: 06/30/76

FROM: J. WOMACK FOR F. BERNDT -- NHTSA

TO: Toyota Motor Sales U.S.A. Inc.

TITLE: FMVSR INTERPRETATION

TEXT: This is in response to your March 24, 1976, letter concerning the label required by @ 567.4(g) of 49 CFR Part 567, Certification.

The certification label is required by paragraph (g) (3) to include "'GROSS VEHICLE WEIGHT RATING' or 'GVWR' followed by the appropriate value in pounds . . ." Paragraph (g) (4) specifies a similar requirement for Gross Axle Weight Ratings.

You have pointed out that the Canadian motor vehicle safety regulations require a similar certification label with these weight ratings expressed in kilograms. You have asked whether a single label that expresses the weight ratings in both pounds and kilograms would be permitted by 49 CFR Part 567. The answer is yes, provided that each kilogram rating, which is optional, appear after the corresponding pound rating, which is required.

Please note that these two ratings differ in legal status. The rating that is expressed in pounds is the official rating for the purposes of the United States Federal motor vehicle safety standards and regulations. The accompanying equivalent kilogram rating, however, will be considered as optional, supplementary information provided for the guidance of the reader. This distinction is necessary, because the measurement values, including weights, that appear in our safety standards and regulations are specified in exact terms, without tolerances. While a measurement in English units can be "equal" to one in metric units to any preselected number of significant figures, the two can never be exactly equal.

ID: nht76-5.21

Open

DATE: 07/08/76

FROM: JOHN WOMACK FOR FRANK BERNDT -- NHTSA

TO: Kentucky Manufacturing Company

TITLE: FMVSR INTERPRETATION

TEXT: This responds to Kentucky Manufacturing Company's June 17, 1976, question whether the replacement of the frame of a converter dolly constitutes the manufacture of a new vehicle subject to applicable motor vehicle safety standards when the running gear (the axles, wheels, suspension, and related components sometimes known as a bogie) and the fifth wheel of the damaged converter dolly are reused. This office received clarification from you by telephone that the fifth wheel would be reused, although this was not stated in your letter.

The replacement of the frame is considered a repair by the National Highway Traffic Safety Administration and not the manufacture of a new vehicle. Thus the operation you describe would not constitute the manufacture of a new trailer that would require certification of compliance with safety standards such as Standard No. 121, Air Brake Systems.

I have enclosed a copy of a recent amendment of NHTSA regulations that permits the rebuilding of trailers without certification in some cases when it was previously prohibited. The details of the conditions under which such rebuilding is allowed are discussed in the preamble of the document.

Yours truly,

Enclosure

ATTACH.

KENTUCKY MANUFACTURING COMPANY

June 17, 1976

Frank A. Berndt -- National Highway Traffic Safety Administration

Dear Mr. Berndt:

Would the installation of a new frame on a converter dolly require certification to FMVSS-121 if the axle, air brake equipment, wheels & tires are used from the old, damaged unit? The dolly would still carry the old identification, serial number, etc.

Very truly yours,

Glenn W. Dobrick -- Chief Engineer

ID: nht76-5.22

Open

DATE: 03/11/76

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: Hardings Lane

TITLE: FMVSR INTERPRETATION

TEXT: I am writing in response to your March 9, 1976, telephone conversation with Mark Schwimmer of this office concerning the meaning of "GVWR" as it appears in Federal Motor Vehicle Safety Standard No. 301-75, Fuel System Integrity.

"GVWR" or "Gross vehicle weight rating" is defined in 49 CFR 571.3 as:

the value specified by the manufacturer as the loaded weight of a single vehicle.

One constraint on this specification is found in @ 567.4(g)(3) of 49 CFR Part 567, Certification, which requires that the GVWR shall not

be less than the sum of the unloaded vehicle weight, rated cargo load, and 150 pounds times the vehicle's designated seating capacity. . . .

An information sheet entitled "Where to Obtain Federal Motor Vehicle Safety Standards and Regulations" is enclosed for your convenience. If you have any further questions, please do not hesitate to write.

ID: nht76-5.23

Open

DATE: 06/02/76

FROM: AUTHOR UNAVAILABLE; Stephen P. Wood; NHTSA

TO: American Honda Motor Co. Inc.

TITLE: FMVSR INTERPRETATION

TEXT: This is in response to your May 6, 1976, request for confirmation that the Honda "MPV" qualifies as a multipurpose passenger vehicle although it is constructed on a "modified" truck chassis.

In our letter to you of April 30, 1976, we concluded that the Honda "MPV" would be classified as a multipurpose passenger vehicle, based upon the assumption that the "MPV" is constructed on a truck chassis. You responded that the "MPV" is constructed on a "modified" truck chassis, and questioned whether the National Highway Traffic Safety Administration considered this fact in its previous interpretation.

The reference to "truck chassis" in the definition of multipurpose passenger vehicle, 49 CFR Part 571.3(b), is intended to include chassis that were designed and developed for trucks, but which have been produced in a version for use in passenger carrying vehicles. According to your letter and drawings of March 1, 1976, the Honda "MPV" is a passenger version of the Honda TN500 light truck. Since the modification of the chassis in the production of the "MPV" does not appear to be so great that the major characteristics of the truck chassis are destroyed, we confirm our previous determination that the Honda "MPV" qualifies as a multipurpose passenger vehicle.

Sincerely,

ATTACH.

AMERICAN HONDA MOTOR CO. INC.

May 6, 1976

Stephen P. Wood -- Assistant Chief Counsel, U. S. DEPARTMENT OF TRANSPORTATION, National Highway Traffic Safety Administration

Dear Mr. Wood:

Your Ref: N40-30

Thank you for your letter of April 30, regarding the Honda "MPV."

I would like to point out that the chassis upon which the "MPV" is constructed is a modified truck chassis. This is clearly shown in the drawings which I sent to you.

I would like to confirm that this fact was considered in your assumption that the "MPV" is constructed on a truck chassis, and if not does it make any difference to your opinion.

Please call me at the telephone number shown above if you have any questions about this matter.

I look forward to your early response.

Yours truly,

Brian Gill -- Assistant Manager, Safety & Environmental Activities

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.

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