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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 451 - 460 of 2066
Interpretations Date
 search results table

ID: 24100.ztv

Open



    Mr. Mac Yousry
    Global Vehicle Services, Corp.
    1238 West Grove Avenue
    Orange, CA 92865



    Dear Mr. Yousry:

    This is in reply to your e-mails of February 21 and 22, 2002, to Taylor Vinson of this Office.

    You referenced S5.1.1.18 of Federal Motor Vehicle Safety Standard No. 108, which states that a backup lamp is not required to meet minimum photometric values at each test point specified in Table 1 of SAE Standard J593c if the sum of the candlepower measured at the test points within each group listed in Figure 2 of Standard No. 108 is not less than the group totals specified in that figure. You have tested a backup lamp that exceeds the 300 cd maximum at test point H-V by 80 cd, but meets the group total requirements, and ask whether the lamp is acceptable.

    The answer is no. Tables I and III of Standard No. 108 require back up lamps to be designed to conform with SAE Standard J593c, which is incorporated by reference in Standard No. 108. Under the SAE Standard, when one or more back up lamps are used, the maximum intensity at any point in each lamp must not exceed 300 cd.

    The SAE standard establishes 22 discrete test points. Figure 2 of Standard No. 108 clusters these test points into six groups and totals the minimum photometric value of each test point in the group for a group total. If a manufacturer tests a back up lamp for photometric conformance and the lamp does not meet the minimum value specified at any one of the 22 test points, under S5.1.1.18, the lamp will pass the photometric test if the value measured at the failed test point, when added to the measured value of other test

    points in the group, results in a total that equals or exceeds the total required for the group as a whole. But Figure 2 in no way affects the limitation of 300 cd imposed by SAE Standard J593c.

    I hope that this answers your question.

    Sincerely,

    Jacqueline Glassman
    Chief Counsel

    ref:108
    d.4/4/02



2002

ID: 18569.ztv

Open

M. J. Shaw
379 E. Main St.
Peru, IN 46970-2522

Dear Mr. or Ms. Shaw:

This is in reply to your postcard of August 4, 1998, to Philip Recht, the Deputy Administrator of this agency, about the recent final rule on low-speed vehicles.

Your first question is whether "the Canadian Bombardier neighborhood vehicle (electric mini-car) [is] now street legal in the USA." Your second question is whether "all states, including [Indiana, are] registering the NV for legal operation."

The Federal government has the authority to issue Federal motor vehicle safety standards such as it did recently with Standard No. 500 Low-Speed Vehicles. Thus, if a motor vehicle that meets the definition of "low-speed vehicle" is manufactured and certified by its manufacturer as complying with Standard No. 500, it is legal to import and sell that vehicle in the United States. Thus, Bombardier may import its Neighborhood Vehicle (NV) from Canada by certifying compliance with Standard No. 500. We do not know, however, whether Bombardier has begun to do so. Although the sale of a certified low-speed vehicle would not violate Federal law, the requirements for registration of vehicles and conditions of their use on the public roads are matters under the authority of the states. This means that a vehicle could be "street legal," to use your term, for Federal purposes but not under state law.

This brings us to your second question. We have no information whether states are or are not registering NVs or other types of low-speed vehicles. Some states, at this point, may be reviewing Standard No. 500 to determine how it affects the laws currently existing in that state. We do not know the views of Indiana on this issue. However, if you wish to ask the Indiana Department of Motor Vehicles for its opinion, you should identify the vehicle as a 4-wheeled motor vehicle, other than a truck, whose maximum speed is more than 20 miles per hour but not more than 25 miles per hour.

If you have any further questions, you may phone Taylor Vinson of this office (202-366-5263).

Sincerely,
Frank Seales, Jr.
Chief Counsel
ref:500
d.9/29/98

1998

ID: 1982-1.34

Open

TYPE: INTERPRETATION-NHTSA

DATE: 03/30/82

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: Norton Motors Limited

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of March 5, 1982, asking whether a proposed motorcycle taillamp assembly would comply with Motor Vehicle Safety Standard No. 108.

As you point out, the standard requires a minimum distance of 4 inches edge to edge between turn signal lamps and stop/tail lamps. Since you state that you cannot achieve this with your design, the lamp as currently designed would not be permitted by our standard. This will confirm the oral interpretation provided by Taylor Vinson of this office when you telephoned on March 22.

You will be interested to know that we are presently studying side and rear conspicuity of motorcycles. This research is being conducted by Ketron in Philadelphia. Pennsylvania, and the final report is expected in July 1982 should you wish to obtain a copy of it from us.

As you requested confidential treatment of your engineering drawing, we are returning it to you.

ENC.

CONFIDENTIAL DRAWING

NORTON MOTORS (1978) LIMITED

MARCH 5, 1982

Frank Berndt Legal Counsel National Highway Traffic Safety Administration Dept of Transportation

Dear Sir,

NORTON REAR LAMP UNITS 92-1068

1. We have designed a new rear lamp unit, and enclose a print of the drawing, which we would ask you to regard as confidential.

2. As you will see, the rear lamp unit comprises a very wide stop/ tail light assembly, with three separate lenses.

3. Your regulation (MVSS 108 issue 1, March 79) calls for minimum horizontal separation centre line to centre line, of 9 inches between turn signal lamps. Ours are 12.2 inches apart.

4. However, you also call for a minimum distance of 4 inches, edge to edge between turn signal lamps and stop/tail lamps. This we cannot achieve because of our very wide rear light.

5. We feel the wide rear light makes a positive contribution to road safety. We need your assistance to determine whether or not you consider this rear lamp unit satifies the spirit of your legislation, if not the letter.

We shall await your reply with great interest, and thank you for your assistance.

G.K. BLAIR SALES MANAGER

ID: nht71-5.55

Open

DATE: 05/13/71

FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA

TO: Patton; Blow; Verrill; Brand & Boggs

TITLE: FMVSR INTERPRETATION

TEXT: This is in reply to your letter of May 3, 1971, requesting an additional interpretation of the Tire Identification and Record Keeping Regulation.

If in fact, the vehicle manufactured is not considered a motor vehicle within the meaning of the Act and the mini-bike interpretation (34 F.R. 15416) (copy enclosed), then Part 574, the Tire Identification and Record Keeping Regulation, and section 113 (15 U.S.C. 1402) will be inapplicable.

SINCERELY,

PATTON, BLOW, VERRILL, BRAND & BOGGS

May 3, 1971

Lawrence R. Schneider, Esq. Acting Chief Counsel, NHTSA

Re: Your reference 40-30

Thank you for your letter of April 28th in response to my letter of April 12th which requested confirmation of my interpretation of certain requirements of MVSS Part 574. Your reply raises an additional question which I would appreciate having answered by your office.

Your letter states that "the regulation does not apply to tires manufactured exclusively for the [off-road vehicle]." The underscored words "manufactured exclusively" concern me inasmuch as I pointed out in my April 12 letter that Cushman frequently utilizes DOT coded tires on golf carts and other off-road vehicles -- that is, tires that could also be used on on-road vehicles. The question remains, therefore, whether the record-keeping requirements as well as the requirements of Section 15 U.S.C. @ 1402 apply in the case of tires that could be used for either on-road or off-road vehicles but are in fact utilized on off-road vehicles.

In light of the foregoing, I find it necessary to repeat my request for confirmation of the analysis made in my April 12 letter as follows:

"As I understand it, Cushman is not required to follow the Part 574 record keeping with respect to tires installed

2 on such vehicles [off-road], nor would the other requirements of 15 U.S.C. @ 1402 apply. Further, as I read Part 574, Cushman has no obligation to report to the tire manufacturer any information regarding tires purchased for installation on off-road vehicles."

In the event that you have any questions in connection with the foregoing, please do not hesitate to contact me.

Charles O. Verrill, Jr.

ID: nht92-1.45

Open

DATE: 12/02/92

FROM: FRANK E. TIMMONS -- ASSISTANT VICE PRESIDENT, TIRE DIVISION, RUBBER MANUFACTURERS ASSOCIATION

TO: PAUL JACKSON RICE -- CHIEF COUNSEL, NHTSA

TITLE: NONE

ATTACHMT: ATTACHED TO LETTER DATED 2-11-93 FROM JOHN WOMACK TO FRANK E. TIMMONS (A40; STD. 109; STD. 119; PART 574); ALSO ATTACHED TO LETTER DATED 11-13-92 FROM PAUL JACKSON RICE TO UNDER SECRETARY, KUWAIT MINISTRY OF COMMERCE AND INDUSTRY; ALSO ATTACHED TO LETTER (DATE ILLEGIBLE) FROM UNDER SECRETARY, KUWAIT MINISTRY OF COMMERCE AND INDUSTRY.

TEXT: Your November 13, 1992 letter to the Under Secretary, Ministry of Commerce Kuwait has just been brought to my attention (see attached). There are two statements in your letter that are incorrect. If the Kuwait government does not realize this, it is possible that US tire manufacturers could be adversely affected.

In your third paragraph, starting on line 3, you state" . . .all new tires sold for use on other motor vehicles must be certified as complying with Standard No. 119 (49 CFR Part 571.119)." This is not true. Only those tires designed and offered for sale for use on highway vehicles, other than passenger cars, must be certified as being in compliance with FMVSS 119.

The other misstatement in your letter is in your response to their question No. 1. "Must all tires manufactured and sold in the United States bear the 'DOT' mark?". Your answer - "Yes, assuming that the tires are intended for use on motor vehicles." is not correct. Only those tires intended for use on highway vehicles must be labeled with the DOT mark. NHTSA has stated in the past on more than one occasion that the DOT may not be labeled on tires that do not have an applicable Federal Motor Vehicle Safety Standard.

It is requested that NHTSA send a follow-up letter to Kuwait clarifying that your response applied only to motor vehicles and their tires that are designed primarily for use on the highway.

As mentioned to Walter Myers of your staff yesterday, I will ask Mr. Ed Wunder to discuss this with his contacts in Kuwait. Mr. Wunder is stationed in Saudi Arabia and is supported jointly by industry and the Department of Commerce (NIST) to help US manufacturers sell their products in the Gulf countries.

ID: nht81-1.10

Open

DATE: 02/05/81

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: Richard A. Rechlicz

TITLE: FMVSS INTERPRETATION

TEXT: This responds to your December 18, 1980, letter asking several questions about the application of Standard No. 217, Bus Window Retention and Release, to school buses.

First, you refer to paragraphs (a) and (b) of S5.2.3.1 and question which paragraph establishes the minimum safety level. Since paragraph (a) was first proposed and subsequently modified by the addition of paragraph (b), you believe that paragraph (a) defines the minimum level of safety while paragraph (b) meets or exceeds that level of safety. This reading of the standard is not completely accurate. Paragraph (a) of that section was the first part of the section to be proposed. Before the rule became effective, however, the proposal was amended to include paragraph (b). Accordingly, both paragraphs must be read together as defining the minimum mandatory safety performance requirement.

Second, you ask for our opinion of the preemption clause in the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1392(d)). You state that your interpretation is that no State or local government may adopt a safety standard applicable to the same aspect of performance as a Federal standard unless it is identical to the Federal standard. An exception exists for standards applicable to vehicles purchased for the State's or the local government's own use. This is an accurate reading of the preemption clause, however, a major area of contention frequently arises around what constitutes the same aspect of performance as a Federal standard.

Third, you ask whether the Federal government, through Standard No. 217, has preempted States from regulating unobstructed openings for purposes of emergency exists. As you are aware, the standard states that the emergency exit opening must be of a certain size. Further, the standard specifies the location of one of the seats at the forward-most side of the emergency exit. These are the agency's only requirements relating to the unobstructed emergency exit opening. With respect to whether a State could regulate further in this area, it would depend upon the type of regulation the State adopted. For example, a regulation that governed the size of the opening or the location of the forwardmost seat would probably be preempted. However, a regulation that required an aisle leading to the side emergency door would not likely be preempted, since the Federal government does not regulate aisles in buses.

Your fourth question asks us to comment on whether a Wisconsin statute requires aisles in school buses. The agency does not issue interpretations of State statutes. You should contact appropriate State officials for this information.

Finally, you recite a Wisconsin definition of emergency door zone which states that it is "the area inside the vehicle required by FMVSS 217 to be unobstructed at the emergency exit . . . " You then ask whether there are any such zones on buses constructed with side emergency exits. The agency, as stated above, requires an unobstructed opening at each exit (S5.2.3.1). If Wisconsin defines this as a zone, then such a zone exists in buses for purposes of the Wisconsin statute.

SINCERELY,

RICHARD A. RECHLICZ

ATTORNEY AND COUNSELOR

December 18, 1980

United States Department of Transportation National Highway Traffic Safety Administration

Attn: Frank Berndt, Chief Counsel

RE: Standard 217, Bus Window Retention and Release File No. 80-82

Dear Mr. Berndt:

Please be advised that the undersigned has been retained by and represents a corporation engaged in the manufacture of school buses throughout the United States, for the purpose of investigation certain issues that relate to standard 217, Bus Window Retention and Release and the Wisconsin Administrative Code Chapter MVD 17 entitled Transporation of School Children.

For your information, I have enclosed a copy of the Wisconsin Administrative Code MVD 17.

The purpose of this correspondence is to request a written legal opinion from your offices on the issues raised in this correspondence as they relate to standard 217 and MVD 17.

First, as I understand the legislative history of standard 217, S5.2.3.1 was first issued with only subsection (a). Later, as a response to and after opposition was voiced by certain west coast bus manufacturers using the "California window" due to rear mounted engines, NHTSA promulgated subsection (b). Thus, the present standard allows the manufacturer to choose either subsection (a) or subsection (b). Is it correct that subsection (a) established the minimum degree of safety and that subsection (b) either meets or exceeds that minimum standard?

Second, please advise as to the NHTSA position on the supremacy clause, 15USC section 1392(b). It was my belief that with respect to the directive of Congress to the NHTSA to address itself to the safety standards itemized in 15 USC 1395(i), where the NHTSA issued a safety standard thereon, the State could not adopt "any safety standard applicable to the same aspect of performance of said vehicle or item of equipment which is not identical to the Federal standard." (State owned and used vehicles excepted).

Third, and I believe this relates to question 2, as I read Standard 217, especifically 217 S5.2.1, it is my impression that all buses with a GVWR of 10,000 pounds or more "shall meet the unobstructed openings requirements by providing side exits and at least one rear exit that conforms to S5.3 through S5.5". Has the federal government pre-empted the field as to what is unobstructed for the openings? For this example, please refer to the spec drawing enclosed: if the manufacturer meets the requirements of S5.4.2.1(b), can the State initiate a rule that the seating arrangement as shown in the drawing for the side door obstructs the opening? (Assume also that the seating arrangement meets federal specifications as to distance.)

Fourth, it is my belief that nowhere in the Wisconsin Administrative Code MVD 17, is there a requirement that buses must have aisles. From your reading of that chapter alone, and I suggest that the word aisle is used only in MVD 17.13(1) and 17.25(2)(b), do you find anywhere that MVD 17 either

(1) defines aisle? or

(2) requires aisles in school buses?

Again, I request the opinion on this aspect only from your reading of the provision, not from other outside factors.

Finally, MVD 17.06(3) defines "emergency door zone" as "the area inside the vehicle required by FMVSS 217 to be unobstructed at the emergency exit. . ." From a reading of this definition alone, could you please advise as to whether there are any emergency door zones on a bus that is manufactured with exists meeting FMVSS 217 S5.2.3.1(b) ("California window" and side door exit).

I understand that responses to all of these issues raised in this correspondence will require a considerable amount of time by your offices. Please realize that it is important that we have a response from your offices on each question.

Accordingly, if there is any question that is not clear to you as stated, please call.

Furthermore, I would request that you acknowledge receipt of this correspondence.

Your prompt and immediate attention to this correspondence is appreciated as we are currently experiencing certain time restraints.

I thank you in advance for your consideration and courtesies. Seasons greetings to you and your family.

ENC.

cc: THOMAS BUILT BUS, INC. ATTN: BRYCE HUNT; RODDY LIGON, JR.; WILLIAM G. LADEWIG, ATTY AT LAW;

NOTE:

THE SEAT JUST FORWARD OF THE SIDE EMERGENCY DOOR CAN NOT EXTEND BEYOND LEADING VERTICAL EDGE OF DOOR OPENING.

APPLIES TO:

"S" MODELS WITH SIDE EMERGENCY DOOR AND WITHOUT REAR EMERGENCY DOOR.

ALL GAUGES TO CONFORM TO AMERICAN IRON A STEEL INSTITUTE (AISI) SPECIFICATIONS

THOMAS BUILT BUSES, INC. HIGH POINT, N.C.

TITLE

SEAT LOCATION - SIDE EMERGENCY DOOR FMVSS #217

(Graphics omitted)

ID: 003059 bts

Open

    Mr. Joe Masci
    Pollak Switch Products Division
    300 Dan Road
    Canton, MA 02021

    Dear Mr. Masci:

    This responds to your May 2, 2003, faxed letter and your telephone conversations with Mr. Otto Matheke of my staff concerning the application of Federal Motor Vehicle Safety Standard (FMVSS) No. 209, Seat belt assemblies, to a seat belt tension sensor (BTS). You stated that the BTS is used in conjunction with a passenger weight classification system to prevent misclassification of children seated in child safety seats. Your letter asked several questions as to how a seat belt assembly using a seat belt tension sensor would be tested for compliance with Federal standards. Each of your questions is addressed below.

    1. General Applicability of FMVSS No. 209.

    You asked if the BTS would be considered part of the seat belt assembly under FMVSS No. 209, or if it would be considered an anchorage under FMVSS No. 210, Seat belt assembly anchorages, which is a vehicle standard. S3 of FMVSS No. 210 defines a seat belt anchorage as:

    [A]ny component, other than the webbing or straps, involved in transferring seat belt loads to the vehicle structure, including, but not limited to, the attachment hardware, seat frames, seat pedestals, the vehicle structure itself, and any part of the vehicle whose failure causes separation of the belt from the vehicle structure.

    Accordingly, FMVSS No. 210 applies to fixed attachment points on the vehicle structure and the associated hardware. FMVSS No. 209 applies to seat belt assemblies, defined as:

    [A]ny strap, webbing, or similar device designed to secure a person in a motor vehicle in order to mitigate the results of any accident, including all necessary buckles and other fasteners, and all hardware designed for installing such seat belt assembly in a motor vehicle. (S3 of FMVSS No. 209)

    In your phone conversation, you stated that the BTS is sold to manufacturers of seat belt assemblies and may be placed in a variety of positions on the assembly. As a component of the seat belt assembly, the BTS would be subject to the requirements of FMVSS No. 209. However, because the BTS may be incorporated into a seat belt system in a variety of ways, we are unable to determine whether the BTS could ever be considered a seat belt anchorage under FMVSS No. 210.

    2. FMVSS No. 209 Strength requirements

    In your letter you included a diagram properly identifying the components of a Type 2 seat belt assembly and asked for verification of the strength requirements for each labeled component. The strength requirements for FMVSS No. 209 are contained in: S4.2, webbing; S4.3, hardware; and S4.4, assembly performance.

    Under S4.2(b), webbing in the pelvic restraint portion of a Type 2 seat belt assembly must have a breaking strength of not less than 22,241 N (5,000 pounds). The upper torso portion of a Type 2 seat belt assembly must have a minimum breaking strength of 17,793 N (4,000 pounds). The testing procedure for both portions of webbing is contained in S5.1(b).

    S4.3(c) requires that attachment hardware bolts used to secure the pelvic restraint of a seat belt assembly must be able to withstand a force of at least 40,034 N (9,000 pounds) when testing in accordance with S5.2(c)(1). Other attachment hardware designed to receive the ends of two seat belt assemblies shall withstand a tensile force of at least 26,689 N (6,000 pounds) when tested under S5.2(c)(2).

    S4.4 sets forth the strength requirements of a Type 2 seat belt assembly in subsection (b). Under S4.4(b)(1), each structural component in the pelvic restraint must withstand a force of not less than 11,120 N (2,500 pounds). This includes the BTS, if it is located along the pelvic portion of the pelvic restraint. S4.4(b)(2) requires that each structural component in the upper torso restraint portion of the seat belt assembly be able to withstand a force of not less than 6,672 N (1,500 pounds). This includes a torso guide loop and retractor if the design permits only upper torso restraint forces on the restraint. Under S4.4(b)(3), any structural component that is common to both the pelvic and upper torso restraints must withstand a force of not less than 13,345 N (3,000 pounds). This would include any buckle or portion of the BTS that would be subject to forces from both the pelvic and upper torso restraints. The seat belt assembly performance for a Type 2 seat belt assembly is tested by the procedure specified in S5.3(b).

    3. Procedure for Testing Assembly Performance

    In your letter you asked what would be the proper method of attaching and orienting an assembly with a BTS under the test procedures in S5.3. Under S5.3, each end of the pelvic or torso portion of the belt assembly is attached to an anchorage bar to form a loop over rollers on a testing machine. (See FMVSS No. 209 Figure 5, enclosed.) The anchor points are such that the webbing is parallel in two sides of the loop. The attaching bolts are either aligned with or at an angle of 45 or 90 degrees to the webbing, whichever results in an angle nearest to 90 degrees between webbing and attachment hardware.

    You stated that you believe the appropriate testing method for an assembly with the "BTS installed between the fixed anchor on the pelvic-only side of the belt and the belt webbing" would be to utilize the procedure in S5.3(a)(2) for a "nonthreaded anchorage." Such a determination would be governed by the specific application of the belt assembly and not by the presence of a BTS. S5.3(a)(2) declares that testing will be performed in accordance with the installation instructions provided with belts designated for use in specific models of vehicles. In such an instance, the anchorages of the vehicle-specific assembly would be installed for testing so as to produce the maximum angle in use indicated by the installation instructions. From your letter and phone conversations, the BTS is sold to seat belt assembly manufacturers for eventual use in a variety of vehicle models. As such, the "nonthreaded anchorage" procedure would only be appropriate in those instances where the BTS is incorporated into a seat belt assembly that is designed for a specific vehicle and is accompanied by instructions for installation specific to that vehicle.

    For the assembly you specified, compliance testing would require the attaching bolts to be set according to the general set-up procedure. The attaching bolts would be positioned under S5.3(a)(2) such that the angle between the webbing and the attachment hardware is as close to 90 degrees as possible.

    4. Minimum Force Requirements for Assembly Performance

    In your letter you asked if the force minimums listed for the Type 2 belt component strength requirements apply to each component individually or to the test loop as a whole. The answer is that these force requirements apply to the components and not to the test loop. Under S4.4(b) of FMVSS No. 209, for a Type 2 belt, the structural components in the pelvic restraint must withstand a force of not less than 11,120 N (2,500 pounds), the structural components in the upper torso restraint must withstand a force of not less than 6,672 N (1,500 pounds), and structural components that are common to the pelvic and upper torso restraints must withstand a force of not less than 13,345 N (3,000 pounds). The test procedure for Type 2 belt assembly components requires a tensile force equal to that of the appropriate minimum be applied to the components (S5.3(b)). Therefore, in compliance testing of the pelvic restraint portion of a Type 2 seat belt assembly, a force of 22,240 N (5,000 pounds) would be applied to the test loop. The application of the 22,240 N (5,000 pounds) would be required so that the components would experience a tensile force of 11,120 N (2,500 pounds); the minimum required.

    We note that in a letter to Mr. Douglas Kubehl, dated March 16, 1992, we took the position that under S4.4(b) and the corresponding procedure in S5.3(b), the minimum force requirement would be applied to the test loop. However, we have reconsidered that interpretation and conclude that it was incorrect. The previous interpretation would result in Type 2 seat belt assembly components being tested to much lower force requirements than components in a Type 1 seat belt assembly. However, it is our understanding that all manufacturers of Type 2 seat belt assemblies have built and tested their products in a manner consistent with this revised interpretation, so this revision will not cause any seat belt assemblies (or the vehicles in which they are installed) to become noncompliant. To the extent a manufacturer has relied upon our previous interpretation, we will only pursue an enforcement action for noncompliance with the standard prospectively.

    5. Manual Belts Subject to the Requirements of FMVSS No. 208

    In your letter, you ask if you are correct in understanding that the strength requirements of S4.4 do not apply if the requirements of S5.1 of FMVSS No. 208 are met instead. Your understanding is correct. Under S4.6 of FMVSS No. 209, manual seat belt assemblies subject to the requirements of S5.1 of FMVSS No. 208, Occupant crash protection, would not be required to meet the requirements of S4.2(a)-(f) and S4.4 of FMVSS No. 209. [1] This includes the FMVSS No. 209 strength requirements for seat belt assembly components.

    You further ask, "how frequently do vehicle manufacturers opt for the 208 test option over the static component strength tests in 209?" A seat belt assembly subject to FMVSS No. 209 must comply with that standard, and be certified by its manufacturer as conforming to that standard. We do not collect or maintain data on how vehicle manufacturers certify with respect to their seat belt assemblies, although NHTSA may examine a manufacturer's certification in connection with any prospective or pending enforcement action. As such, we do not know with what frequency manufacturers opt for the FMVSS No. 208 compliance option.

    I hope you find this information helpful. If you have any further questions, please contact Mr. Chris Calamita of my staff at (202) 366-2992.

    Sincerely,

    Jacqueline Glassman
    Chief Counsel

    Enclosure
    ref:209
    d.7/16/03




    [1] Excepted from this provision are seat belts that are subject to S4.1.2.1(c)(2) of FMVSS No. 208, which cross references FMVSS No. 209. S4.1.2.1(c)(2) does not apply to vehicles manufactured on or after September 1, 1986.

2003

ID: aiam4461

Open
Mr. Gary W. Rossow Director, Government Technical Affairs Freightliner Corporation Charlotte Technical Center 9844 Southern Pine Boulevard P.O. Box 7562 Charlotte, NC 282l7; Mr. Gary W. Rossow Director
Government Technical Affairs Freightliner Corporation Charlotte Technical Center 9844 Southern Pine Boulevard P.O. Box 7562 Charlotte
NC 282l7;

"Dear Mr. Rossow: This responds to your letter requesting a interpretation of Standard No. l2l, Air Brake Systems. You asked whether a proposed design would meet the requirements of S5.l.2. Your question is responded to below. By way of background information, the National Highway Traffic Safety Administration does not provide approvals of motor vehicles or motor vehicle equipment. Under the National Traffic and Motor Vehicle Safety Act, it is the responsibility of the manufacturer to ensure that its motor vehicles or equipment comply with applicable requirements. The following represents our opinion based on the facts provided in your letter. Under section S5.l.2, trucks and buses are required to have the following equipment: 'Reservoirs. One or more service reservoir systems, from which air is delivered to the brake chambers, and either an automatic condensate drain valve for each service reservoir or a supply reservoir between the service reservoir system and the source of air pressure. You stated that some of your existing air braked trucks utilize a supply reservoir or wet tank between the service reservoir system and the air compressor without using automatic condensate drain valves on the service reservoirs. You noted that the supply reservoir functions as a means of removing excess water vapor from the air supply to avoid water contamination of the braking system and works on thermodynamic principles whereby water condenses to a liquid as the hot compressed air cools. Your proposed design would utilize an air dryer between the service reservoir system and the air compressor. According to your letter, the air dryer serves the same function as the supply reservoir in your existing system but works on a different principle. You stated that the moist, compressed air passes through a filter media contained in a small canister sized reservoir. The material, a desiccant, has a high chemical affinity for water. The water absorbs on the desiccant and is later purged by stored dry air. The air dryer would have an integral automatic condensate drain valve. Since your proposed design would not include an automatic condensate drain valve for each service reservoir, the issue raised by your letter is whether it complies with S5.l.2's option for 'a supply reservoir between the service reservoir system and the source of air pressure.' You stated that you believe the air dryer with automatic condensate drain is the functional equivalent of the more generally accepted embodiment of a supply reservoir in the context of S5.l.2. You also noted that Standard No. l2l does not specify a separate volume for the supply reservoir, although it does require in S5.l.2.l that the combined volume of all service reservoirs and supply reservoirs be at least l2 times the total service brake chamber volume. You suggested that if the volume of the service reservoirs is l2 times the volume of the service brake chambers, it would appear that there is no requirement for a specific volume in the supply reservoir. While Standard No. l2l does not include a definition for 'supply reservoir,' the term is one that is commonly understood. For example, you indicated in your letter that some of your current brake system designs utilize the 'more generally accepted embodiment of a supply reservoir.' In considering whether a particular item of equipment can be considered a 'supply reservoir,' we believe that effect must be given to both 'supply' and 'reservoir.' The dictionary defines 'reservoir' as 'a receptacle or chamber for holding a liquid or fluid, as oil or gas.' The word 'supply' is defined as 'to furnish or provide.' Random House Dictionary of the English Language (unabridged edition). The Society of Automotive Engineers (SAE) defines 'air reservoir' as '(a) storage container for compressed air.' SAE Recommended Practice J656g, 'Automotive Brake Definitions and Nomenclature.' Thus, in order to qualify as a 'supply reservoir,' an item of equipment must hold or store air in order to furnish or provide the air to the rest of the brake system. The information provided with your letter does not provide sufficient information to determine whether your air dryer qualifies as a 'supply reservoir.' In particular, the information does not indicate whether the air dryer holds other than a de minimis amount of air. While your letter is correct that there is no requirement for a specific volume in the supply reservoir if the volume of the service reservoirs is l2 times the volume of the service brake chambers, an air dryer with a de minimis volume could not be considered to hold or store air in order to furnish or provide the air to the rest of the brake system. On the other hand, if a supply reservoir provides an air cleaning function as well as holding or storing air in order to furnish or provide the air to the rest of the brake system, it would still be a supply reservoir. Sincerely, Erika Z. Jones Chief Counsel";

ID: aiam5312

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Mr. Bob Carver Product Engineering Wayne Wheeled Vehicles 13311 Industrial Parkway Marysville, OH 43040; Mr. Bob Carver Product Engineering Wayne Wheeled Vehicles 13311 Industrial Parkway Marysville
OH 43040;

"Dear Mr. Carver: This responds to your letter of January 8, 1994 asking two questions concerning a recent amendment to Standard No. 217, Bus Emergency Exits and Window Retention and Release (57 FR 49413, November 2, 1992). Your questions and the response to each follow. 1. There's some confusion here in our engineering department regarding the interpretation of the 'Daylight Opening' and 'Unobstructed Opening' as it applies to the new side emergency door specification in FMVSS 217. Page 2 shows the allowable obstruction and the context in which 'Daylight Opening' and 'Unobstructed Opening' are used. Page 3 shows some measurements of our seats placed according to the '30 cm minimum' shown on page 2. Page 4 shows four different interpretations of the 'Unobstructed Opening' area. Depending on the interpretation, between 9 and 15 people may be accommodated by a side emergency door. My question is this: of the four possibilities shown, which definition of the 'Unobstructed Opening' area is correct? Mr. Hott indicated definition 4. The term 'daylight opening' is defined in the Final Rule as 'the maximum unobstructed opening of an emergency exit when viewed from a direction perpendicular to the plane of the opening.' An obstruction in this context would include any obstacle or object that would block, obscure, or interfere with, in any way, access to that exit when opened. In determining the 'maximum unobstructed opening of an emergency exit,' we would subtract, from the total area of the opening, the area of any portions of the opening that cannot be used for exit purposes as a result of the obstruction. The area measurements would be taken when viewed from a direction perpendicular to the plane of the opening. Your question specifically concerns how the 'maximum unobstructed opening' of a side door is measured when the opening is partially obstructed by a seat. In the case of the illustrated door exit, occupants would use the exit by movement along the floor. This would be considered in determining the extent of an obstruction. None of the four examples you enclosed with your letter correctly illustrates the area that would be credited for the illustrated exit. The following regions would not be credited for this exit: (1) the area visually obstructed by the seat, (2) your region A2, an area bounded by a horizontal line tangent to the top of the seat back, a vertical line tangent to the rearmost portion of the top of the seat, the upper edge of the door opening, and the edge of the door forward of the seat, (3) your region A5, an area bounded by the seat back, a horizontal line tangent to the top of the seat back, and the edge of the door forward of the seat, and (4) your region A8, an area bounded by the seat leg, the floor, the lower edge of the seat bottom, and the edge of the door forward of the seat. Because the seat would make the last three regions unusable as exit space for a person traveling along the floor of the bus towards the exit, they would not be credited for that exit. You should be aware that the agency published a notice of proposed rulemaking to amend Standard No. 217 on December 1, 1993 (58 FR 63321). The notice proposed two alternate means for determining the maximum amount of area that will be credited for all types of emergency exits on school buses. The agency is currently reviewing the comments received in response to this notice. I am enclosing a copy of this notice. 2. Here is an excerpt from FMVSS 217 S5.5.3(a): 'Each school bus ....shall have the designation 'Emergency Door' or 'Emergency Exit' as appropriate, .... For emergency exit doors, the designation shall be located at the top of, or directly above, the emergency exit door on both the inside and outside surfaces of the bus..... For emergency window exits, the designation shall be located at the top of, or directly above, or at the bottom of the emergency window exit on both the inside and outside surfaces of the bus.' I've seen a two-sided sticker used by other bus manufacturers. It is applied on the inside surface of a window and the same image 'Emergency Door' or 'Emergency Exit' can be read from both inside and outside the bus. Is it permissible for us to use this sort of decal, assuming it meets all other (i.e., FMVSS 302)? The answer to your question is yes. The agency addressed this issue in an October 2, 1978, letter to Mr. E.M. Ryan of Ward Industries, Inc. I am enclosing a copy of this letter. I hope you find this information helpful. If you have any other questions, please contact Walter Myers of my staff at this address or by phone at (202) 366-2992. Sincerely, John Womack Acting Chief Counsel Enclosures";

ID: 0473

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Mr. John Sheppard
Sales and Marketing Manager
Reflexite Canada, Inc.
6790 Kitimat Road, Unit 18
Mississauga
Ontario L5N 5L9
Canada

Dear Mr. Sheppard:

We have received your letter of November 2, 1994, asking whether certain conspicuity material could be used on trailers required to meet S5.7 of U.S. Federal Motor Vehicle Safety Standard No. 108. You have enclosed samples of the material.

The material alternates red and white stripes "oriented at a 45 degree angle to the edge of the roll." Rolls are either 6 or 8 inches in width and "will not have DOT-C2 marking." In addition, we note that the horizontal length of the red segments is 5 1/2 inches (and presume an equal length for the white segments). Specifically, you have asked whether this material could "be applied to the lower edge of the vehicle's rear doors as a compliant substitute for the 2" 'block pattern' material currently being used?"

Paragraph S5.7's specifications for conspicuity material are intended to ensure uniformity of treatment in order to enhance the ability of drivers of other vehicles to detect large objects in the roadway under conditions when headlamps are used. While S5.7 does not require that the red and white color segments be rectangular, it does establish requirements for their length and width. Under S5.7.1.3(b), each segment shall have a length of 300 mm +/- 150 mm. The color segment separation of 5 1/2 inches on your sample is approximately 140 mm, and thus below the minimum permitted by the standard. Although currently, under S5.7.1.3(d), three widths of retroreflective material are permissible: 50 mm (DOT-C2), 75 mm (DOT-C3), and 100 mm (DOT-C4) and your widths of 6 inches (150 mm) and 8 inches (200mm) do not conform to these specifications, the agency has proposed that these be minimum minimum widths for the DOT grades indicated. We expect a final rule to be issued on this proposal in the near future.

Because the retroreflective material discussed above would not comply with Standard No. 108's requirements for color segment length (and currently width), it could not be used as a substitute for the DOT-C2 material that you currently manufacture. Further, geometrically and photometrically complying material would require the appropriate DOT grade identification marking for use on a trailer required to comply with Standard No. 108.

Sincerely,

Philip R. Recht Chief Counsel ref:108 d:12/7/94

1994

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.