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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 981 - 990 of 2066
Interpretations Date
 search results table

ID: nht80-1.17

Open

DATE: 02/26/80

FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA

TO: Toyota Motor Co. Ltd.

TITLE: FMVSR INTERPRETATION

TEXT: This responds to your recent request for an interpretation concerning the proper designated seating capacity for the rear seat in several Toyota vehicle models (Corolla Sedan, Corolla Coupe, Corona Sedan and Starlet). You assert that the rear seat hip room in these models ranges from 39.4 inches to 42.6 inches, and ask whether the vehicles would qualify as having only two designated seating positions.

Under the strict measurement technique specified in the amended definition of "designated seating position" (SAE J1100a), the Toyota vehicle models in question would have the hip room dimensions you state. This is due to the fact that the SAE procedure specifies that hip room is to be the minimum dimension of the seat cushion. The Toyota designs include wheel wells and contoured side paddings at the intersection of the seat back and seat cushion that establish the minimum dimension of the seat. However, these structures only extend out 4 to 5 inches (approximation) from the seat back. If the hip room of the rear seats is measured midway of the seat cushion, all of the designs have greater than 50 inches of hip room, and ostensibly should have three designated seating positions. Nevertheless, since according to the measurement technique specified in the definition these seats have substantially less than 50 inches of hip room, the agency must conclude that the rear seats could qualify as having only two designated seating positions. This opinion is accompanied with several candid remarks, however.

The effective hip room of the Toyota seat designs is much greater than the approximately 40 inches that is obtained by the technical measuring technique specified in the definition. If two outboard occupants move their hips several inches forward from the seat back in these vehicle designs, the wheel-wells and contoured side paddings are no longer impediments and there is over 50 inches of hip room, as noted above. Moreover, the design of these rear seats is such that use of the center position is "invited." There is at least 10 to 12 inches of well-padded hip room at the center portion of the seat between the inboard ends of the two seat belt assemblies installed in the seats. The manufacturer has given no indication that this space is not intended for occupancy. The agency is also concerned that this center position has no belt assembly to secure a child restraint system, particularly since the rear-center seat is statistically the safest position in a vehicle.

Frankly, with the wide center space that is available in these rear seat designs, we do not believe the manufacturer has made a sincere attempt to indicate to vehicle occupants that the seats are intended for use by only two occupants. It would be a simple matter for the manufacturer to make this obvious by use of a fixed armrest or some other impediment to use of the position. Furthermore, we believe that this message can be given to occupants without otherwise compromising the design the manufacturer wishes to achieve. If the manufacturer does not in fact wish to market the vehicles as having three-passenger rear seats, we do not understand why wide, well-padded center positions are present.

Finally, I am enclosing a copy of an earlier interpretation which discusses the measurement procedure included in the definition of "designated seating position." As that interpretation pointed out, the agency will not allow manufacturers to avoid the obvious intent of the definition by finding "loopholes" in the specified measurement procedure. If designs such as those displayed in the Toyota vehicles persist, without some clear indication that the center position is not to be used, the agency may find it necessary to amend the definition to provide that the hip room measurement is to be taken at the midpoint of the seat cushion. We hope that manufacturers will voluntarily alter designs of this type to conform to the intent of the definition, so that such an amendment is not necessary.

SINCERELY,

TOYOTA MOTOR CO., LTD.

U.S. REPRESENTATIVE OFFICE

January 17, 1980

Ralph Hitchcock Chief, Crashworthiness Division National Highway Traffic Safety Administration

Dear Mr. Hitchcock:

This is to confirm our request, made by Mr. Donald Schwentker, Attorney-at-Law, for a meeting with appropriate National Highway Traffic Safety Administration personnel on Tuesday, January 29, 1980, to seek an interpretation of the designated seating position definition as it applies to several specific Toyota vehicles, as follows:

* Corolla Sedan

* Corolla Coupe

* Corona Sedan

* Starlet ('81 Model)

As you requested, Toyota will bring all vehicles to NHTSA's office on that date.

Our Attorney will contact you by telephone to work out the arrangements.

J. Kawano General Manager

ID: 86-3.35

Open

TYPE: INTERPRETATION-NHTSA

DATE: 05/29/86

FROM: AUTHOR UNAVAILABLE; Erika Z. Jones; NHTSA

TO: Brenda Hartman

TITLE: FMVSS INTERPRETATION

TEXT: Thank you for your letter of February 27, 1986, asking how our regulations affect a product you are considering. In your letter, you asked the agency not to disclose your idea for this product. In a phone conversation of April 28, 1986, with Stephen Oesch of my staff, you waived your request for complete nondisclosure and agreed to the disclosure of a generic description of your product. As you requested, we will not disclose the specific details of your product or the sketches you enclosed with your letter.

Your product is designed to reduce the possibility that a young child could unbuckle a vehicle safety belt. The product would enclose the buckle of the safety belt, so that it is difficult for a child to operate the buckle release.

We have significant reservations about your product. I hope the following discussion explains our reservations and the effect of our regulations on your product.

Our agency has the authority to issue safety standards applicable to new motor vehicles and certain items of motor vehicle equipment. NHTSA, however, does not approve motor vehicles or motor vehicle equipment, nor do we endorse any commercial products. Instead the National Traffic and Motor Vehicle Safety Act establishes a "self-certification" process under which each manufacturer is responsible for certifying that its products meet our safety standards. The agency periodically tests vehicles and equipment items for compliance with the standards, and also investigates other alleged safety-related defects.

Although we do not have any standards that directly apply to your product, we do have several statutory provisions that could affect it. Manufacturers of motor vehicle equipment such as your product are subject to the requirements in sections 151-159 of the Vehicle Safety Act concerning the recall and remedy of products with defects related to motor vehicle safety. The agency does not determine the existence of safety defects except in the context of a defect proceeding, and thus is unable to say whether your product might or might not contain such a defect. However, the agency has reservations about your product because of our concern that people be able to easily and quickly operate a safety belt in an emergency. As the agency said last year on the related topic of the force level necessary to operate buckles in child restraints:

The agency's safety concerns over child restraint buckle force release and size stem from the need for convenient buckling and unbuckling of a child and, in emergencies, to quickly remove the child from the restraint. This latter situation can occur in instances of post-crash fires, immersions, etc. A restraint that is difficult to disengage, due to the need for excessive buckle pressure or difficulty in operating the release mechanism because of a very small release button, can unnecessarily endanger the child in the restraint and the adult attempting to release the child. (50 FR 33722, August 21, 1985)

In addition, use of your product can be affected by section 108(a)(2)(A) of the Vehicle Safety Act. That section prohibits commercial businesses from knowingly tampering with devices or elements of design installed in a vehicle in compliance with the Federal motor vehicle safety standards. One requirement of Standard No. 209, Seat Belt Assemblies, is that the pushbutton release for a safety belt must have a a minimum area for applying the release force. Installation of your device by a commercial business could be prohibited since it apparently would substantially reduce the minimum area available for applying the release force to the safety belt pushbutton. In addition, Standard No. 302, Flammability of Interior Materials, requires new safety belts to meet a flammability resistance requirement. Thus, although Standard No. 302 does not directly apply to aftermarket equipment, commercial businesses could not install your device if it would mean that the safety belt no longer meet the flammability resistance requirements of Standard No. 302.

The prohibition of section 108(a)(2)(A) does not apply to individual vehicle owners who may install or remove any items of motor vehicle equipment regardless of its effect on compliance with Federal motor vehicle safety standards. However, our policy is to encourage vehicle owners not to remove or otherwise tamper with vehicle safety equipment. Installation of your product by any person could be inconsistent with that policy.

If you have any further questions, please let me know.

SINCERELY,

THIS IS A PROPIATARY IDEA, NOT FOR DISCLOSURE.

February 27, 1986

Erika Jones Chief Counsel N.H.T.S.A.

RE: Inquiry of safety standards.

Dear Miss Jones,

I am submitting to you my idea. I would like to know if there are any safety standards which may prohibit me from proceeding with such a product.

I appreciate your cooperation in this matter and would like a response at your earliest convience.

Sincerely,

Brenda Hartman 8617 CRESTON PINCKNEY, MI 48169 (313) 878-2413

ID: 9544

Open

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

ref:217 d:3/24/94

1994

ID: Koito.2followup

Open

    Mr. Kiminori Hyodo
    Deputy General Manager, Regulation & Certification
    Koito Manufacturing Co. , Ltd.
    4-8-3, Takanawa
    Minato-ku Tokyo
    Japan


    Dear Mr. Hyodo:

    This responds to your recent letter requesting further clarification of our August 1, 2005, letter of interpretation to Mr. Takayuki Amma of Koito Manufacturing Co. (Koito), in which we stated that your companys proposed intensity-reducing headlamps would not meet the "steady-burning" requirement of S5.5.10 of Federal Motor Vehicle Safety Standard (FMVSS) No. 108, Lamps, Reflective Devices, and Associated Equipment. As described in Koitos earlier letter, the proposed headlamp would automatically and perceptibly reduce intensity (with approximately a 20-40% reduction in wattage) when the vehicle is stopped, thereafter returning to full intensity once vehicle motion resumed. Your latest letter asked whether a headlamp would be permitted to change in intensity, so long as the light is "perceived to be a steady beam and essentially unvarying in intensity, as well as occurring gradually (e.g. by setting some phase period) such that the change would not be perceptible to oncoming drivers". Presuming that this new design, consistent with your earlier design, would be such that "[a]t all times through the change of the intensity, the lamps provide sufficient level of intensity and will be within the parameters of the minimum and maximum values of candela specified in FMVSS No. 108," the answer to your question is yes.

    To reiterate the relevant provision of FMVSS No. 108, paragraph S5.5.10 provides:

      S5.5.10   The wiring requirements for lighting equipment in use are:
      (a)   Turn signal lamps, hazard warning signal lamps, and school bus warning lamps shall be wired to flash;
      (b)   Headlamps and side marker lamps may be wired to flash for signaling purposes;
      (c)   A motorcycle headlamp may be wired to allow either its upper beam or its lower beam, but not both, to modulate from a higher intensity to a lower intensity in accordance with section S5.6;
      (d)   All other lamps shall be wired to be steady-burning.

    In short, S5.5.10(d) of FMVSS No. 108 requires that all lamps must be "steady burning," unless otherwise permitted, and while S5.5.10(b) does permit headlamps to be wired to flash for signaling purposes, we note that paragraph S3 of FMVSS No. 108 defines "flash" as meaning "a cycle of activation and deactivation of a lamp by automatic means." Through our interpretations, we have explained that the "steady-burning" requirement under the standard means "a light that is essentially unvarying in intensity" (see e.g. , February 9, 1982, letter of interpretation to Dr. H.A. Kendall).

    We further clarified the requirement in S5.5.10(d) in our March 10, 1994 letter of interpretation to Mr. Joe de Sousa. That letter involved the permissibility of daytime running lamps (DRLs) that operated by using the vehicles lower beam headlamps at less than full intensity through "pulse width modulation," a technique which cycles the headlamps "on and off faster than the eye can detect". In our response to Mr. de Sousa, we stated that although a modulating headlamp technically is not a steady-burning one, for purposes of this requirement under S5.5.10(d), we have concluded that there is no failure to conform if the modulating light from the lamp is perceived to be "steady-burning. "

    In our July 21, 1998, letter of interpretation to Mr. Ian Goldstein, we stated that "gradational" daytime running lamps (DRLs), devices that are capable of modulating the intensity of the DRLs according to ambient light conditions, are permissible under FMVSS No. 108. In that letter, we stated, "A DRL with a gradational feature would continue to provide the steady-burning light that is required for DRLs. The standard does not prohibit changes in intensity, which we presume will be within the parameters of the minimum and maximum values of candela specified. "

    In sum, if an intensity-reducing headlamp operates in a manner that meets all of the other applicable requirements of the standard and is perceived as being steady-burning, we believe that such a design would be permissible under the standard, and we would not expect it to be a source of distraction to other drivers.

    If you have further questions, please feel free to contact Eric Stas of my staff at this address or by telephone at (202) 366-2992.

    Sincerely,

    Stephen P. Wood
    Acting Chief Counsel

    ref:108
    d.11/5/05

2005

ID: weeengin.crs

Open

Mr. Jon Shippee
Wee Engineer Inc.
P.O. Box 39
Dayton, IN 47941

Dear Mr. Shippee:

This is in response to your letter of December 13, 1996, in which you state that Wee Engineer Inc. wishes to be registered with the National Highway Traffic Safety Administration (NHTSA) as a vehicle manufacturer under 49 CFR Part 566. You request our assistance in determining the proper classification of the company as a vehicle manufacturer, and in identifying the necessary actions that the company should take.

As described in your letter, Wee Engineer purchases used tractors and trucks and disassembles the components that were added to those vehicles by previous final stage manufacturers, restoring them to the configuration they were in at the incomplete vehicle stage. The company then may either lengthen or shorten the unit, or add or subtract axles and springs, depending on the application for which the vehicle is intended. Additionally, the company may either raise or lower the gross vehicle weight rating (GVWR) originally assigned to the vehicle to meet its intended application.

You state that Wee Engineer is aware that the original certification label must remain on the vehicle. However, the company is concerned that the GVWR identified on that label will not be accurate following the modifications that it performs. As a consequence, you have asked whether Wee Engineer could add an additional label, identifying the GVWR of the vehicle as reconfigured by the company. Incident to this request, you have asked whether Wee Engineer qualifies as a vehicle manufacturer subject to the vehicle certification requirements in 49 CFR Part 567, and if not, whether there is an exception to those requirements that would allow the company to affix certification labels. Alternatively, you have asked whether Part 567 could be amended to grant certification responsibilities to manufacturers who modify a used vehicle's GVWR or change its classification.

From the information you have provided, it appears that Wee Engineer modifies used vehicles and then installs new body and work performing components on those vehicles. Because the Federal motor vehicle safety standards that are issued by NHTSA apply only to new vehicles, those are the only vehicles that must be certified as complying with the standards under 49 CFR Part 567.

NHTSA has issued a regulation at 49 CFR 571.7(e) that specifies the applicability of the standards to vehicles that are assembled from both new and old components. That regulation provides that "[w]hen a new cab is used in the assembly of a truck, the truck will be considered newly manufactured . . . unless the engine, transmission, and drive axle(s) (as a minimum) of the assembled vehicle are not new, and at least two of these components were taken from the same vehicle."

From your description of the manufacturing operations that Wee Engineer conducts, it appears that the engine, transmission and drive axles on the vehicles it assembles are used, and were all originally found on the same vehicle. As a consequence, Wee Engineer is not required to certify those vehicles under 49 CFR Part 567, and cannot be considered a manufacturer for the purpose of those requirements. As noted in your letter, Wee Engineer must ensure that the original certification label remains on these vehicles. Additionally, to avoid a violation of 49 U.S.C. 30112(b), the company must not "knowingly make inoperative any part of a device or element of design installed on or in [those vehicles] in compliance with an applicable motor vehicle safety standard . . . ."

The manufacturer identification requirements in 49 CFR Part 566 apply only to manufacturers of motor vehicles and motor vehicle equipment to which a motor vehicle safety standard applies. See 49 CFR 566.3. Wee Engineer would not be subject to those requirements unless it performs operations other than those described in your letter, which would result in the production of what this agency would regard as a new vehicle under 49 CFR 571.7(e) (i.e., a vehicle in which the engine, transmission, and drive axle(s) are new, or if used, are taken from three separate vehicles).

In response to your questions regarding Part 567, there is currently no express exception that would allow a party other than the original manufacturer of a vehicle to certify its compliance with applicable safety standards. However, in prior interpretation letters, this Office has recognized that when modifications are made to a used vehicle that change the GVWR identified on its certification label, the modifier is permitted to install an additional label that identifies the GVWR of the vehicle as modified. We have allowed this practice so that owners and users of the vehicle may be apprised as to how heavily the vehicle may safely be loaded.

I hope this information is helpful. If you have any further questions regarding this matter, feel free to contact Coleman Sachs of my staff at the address above, or by telephone at 202-366-5238.

Sincerely,

John Womack

Acting Chief Counsel

ref:567

d:5/2/97

1997

ID: Roberts.1.wpd

Open

    Mr. Mark Roberts
    Engineering Manager
    B&R Manufacturing Inc.
    4600 Wyland Drive
    Elkhart, IN 46516

    Dear Mr. Roberts:

    This responds to your letter asking whether it would be permissible for a member of the transit bus industry to replace a required passenger-side, flat unit magnification mirror installed on new buses having a gross vehicle weight rating (GVWR) of more than 4,536 kg (10,000 pounds) with a 40" to 60"-radius convex mirror. As discussed in a conversation with Eric Stas of my staff, your company manufactures the aftermarket mirrors in question, and you seek confirmation of "What is [a] legal and an illegal mirror once the buses are in revenue service?"

    We would like to begin by explaining that the National Highway Traffic Safety Administration (NHTSA) is authorized to issue Federal motor vehicle safety standards (FMVSSs) that set performance requirements for new motor vehicles and items of motor vehicle equipment. Manufacturers are required to certify that their products conform to our safety standards before they can be offered for sale.

    One of the safety standards we have issued is FMVSS No. 111, "Rearview Mirrors" (49 CFR 571.111). FMVSS No. 111 sets different requirements for buses depending on the GVWR. Buses, other than school buses, with a GVWR of more than 4,536 kg must meet the requirements of S7.1, which requires outside mirrors of unit magnification, each with not less than 323 cm2 of reflective surface, installed with stable supports on both sides of the vehicle. Vehicle manufacturers must install mirrors that comply with S7.1 in order to certify new buses covered under the standard.

    After the first sale of the vehicle, manufacturers, distributors, dealers, and repair businesses are prohibited from "knowingly making inoperative" any device or element of design installed on or in a motor vehicle in compliance with an applicable standard. 49 U.S.C. 30122. In general, the "make inoperative" prohibition requires businesses which modify motor vehicles to ensure that they do not remove, disconnect, or degrade the performance of safety equipment installed in compliance with an applicable standard. If NHTSA determines that a business has violated the "make inoperative" provision, it may assess a civil penalty in the amount of $5,000 per violation (not to exceed $15,000,000 in the aggregate). 49 U.S.C. 30165(a)(1). Thus, a manufacturer of new transit buses or other commercial entity repairing or modifying such buses could not replace a mirror complying with FMVSS No. 111 with another mirror that does not comply with the standard. However, it would be permissible to install your convex mirror on the passenger side of the bus as a supplement to a unit magnification mirror that meets all applicable requirements of FMVSS No. 111.

    The "make inoperative" provision does not apply to the actions of a vehicle owner in modifying his or her own vehicle. Consequently, NHTSA regulations do not prevent transit bus companies from making changes to their own used buses in their own garages or repair and maintenance facilities, even if they cause a vehicle to no longer comply with NHTSA safety standards. However, we urge vehicle owners not to degrade the safety of any system or device on their vehicles, including those required by FMVSS No. 111.

    Further, I note that the Departments Federal Motor Carrier Safety Administration (FMCSA) has jurisdiction over interstate motor carriers operating in the United States. Under FMCSA regulations, there is a provision related to "rear-vision mirrors" at 49 CFR 393.80, which provides in relevant part:

    Every bus, truck, and truck tractor shall be equipped with two rear-vision mirrors, one at each side, firmly attached to the outside of the motor vehicle, and so located as to reflect to the driver a view of the highway to the rear, along both sides of the vehicle. All such regulated rear-vision mirrors and their replacements shall meet, as a minimum, the requirements of FMVSS No. 111 (49 CFR 571.111) in force at the time the vehicle was manufactured.

    49 CFR 393.80(a). Thus, for vehicles covered under FMCSA regulations, there is an ongoing requirement for rear-vision mirrors that meet the requirements of FMVSS No. 111. You or transit bus owners should contact Larry Minor of the FMCSA at (202) 366-4009 for further information about this regulation and the vehicles to which it applies.

    In addition, States have the authority to regulate the use and licensing of vehicles operating within their jurisdictions. Therefore, you or transit bus owners should check with the Department of Motor Vehicles in any State in which the equipment will be sold or used regarding any such requirements.

    I hope you find this information useful. If you have further questions, please feel free to contact Eric Stas of my staff at this address or by telephone at (202) 366-2992.

    Sincerely,

    Jacqueline Glassman
    Chief Counsel

    ref:111
    d.9/5/03

2003

ID: 13415.ztv

Open

Ms. Ana S. Salcedas
308 N. Forklanding Road
Maple Shade, NJ 08052

Dear Ms. Salcedas:

This responds to the letter that you and Mr. Silva sent us on December 14, 1996. We are sending a copy of our reply to Mr. Silva at his Philadelphia address. You have asked our "assistance in ensuring that the patent [for the Auto Brake Light] meets the requirements for Code 571.108."

The patent application indicates that the Auto Brake Light is a message-sending device that can take several forms. In one application, the center highmounted stop lamp can display the message "STOP". In another form, the left hand stop lamp, the center highmounted stop lamp, and the right hand stop lamp can display, one word to a lamp, the message "SLOW DOWN NOW". We assume that the lower stop lamps could also display the message "SLOW DOWN." The application states that "[o]ptimally, the present invention may be used with retrofitted light assemblies that are attached to a vehicle after its original manufacture."

Under our basic regulatory statute, 49 U.S.C. Chapter 301, a motor vehicle must conform with all applicable Federal motor vehicle safety standards at the time it is sold and delivered to its initial purchaser. This means that, if the vehicle is modified after manufacture and before such sale, it must continue to comply with the Federal safety standards after the modifications. Motor Vehicle Safety Standard No. 108 Lamps, Reflective Devices and Associated Equipment, 49 CFR 571.108, permits the addition of supplementary lighting devices at the time of initial manufacture or before initial sale provided that they do not impair the effectiveness of lighting equipment required as original equipment by Standard No. 108.

As noted above, in one form of your invention, the center highmounted stop lamp can display the word "STOP." Figure 10 of Standard No. 108 establishes minimum candela intensity values that must be met at individual test points on the lamp, or the sum of such test points within zones. If any portion of the word "STOP" obscures the light at any individual test point so that the zone total falls below the minimum sum specified for the zone, that obscuration would create a noncompliance with Standard No. 108, and the retrofitted lamp would not be permissible. In addition, visibility of the center stoplamp signal must not be impaired by any part of the vehicle including the word "STOP" from test points 10U to 5D and from 10L to 10R, unless the lamp is designed to comply with all requirements when the obstruction is considered. If the letters can be arranged so that the lamp continues to comply, as discussed above, we do not believe that the word "STOP" would impair the effectiveness of the center stop lamp.

On the other hand, we believe that the message "SLOW DOWN" or "SLOW DOWN NOW" when placed on the lower stop lamps could create a momentary distraction, which would impair the effectiveness of the stop lamp system when used to signal that the vehicle is stopping. This aspect of your invention would not be permitted by Standard No. 108.

Once a motor vehicle is sold, 49 U.S.C. Chapter 301 prohibits manufacturers, dealers, distributors, and motor vehicle repair businesses from making inoperative any device or element of design installed in accordance with a Federal motor vehicle safety standard. We view the phrase "making inoperative" in this case as the equivalent of creating a noncompliance with Standard No. 108. This means that the persons named in the previous sentence may not retrofit a center lamp with the word "STOP" if it obscures any of the required test points. Further, it means that such persons may not retrofit vehicles with lamps spelling "SLOW DOWN NOW."

Because existing lamps are designed to meet the required test points with an unobscured lens, it is almost a certainty that lamps on vehicles in use would become noncomplying if retrofitted with letters forming words such as "STOP" and "SLOW DOWN NOW."

You will note that the prohibition discussed above does not extend to the vehicle owner who, under the statute, may create a noncompliance in his or her vehicle without violating Federal law. But a vehicle modified by its owner remains subject to the laws of the States in which it is registered and used. We are unable to advise you on State laws that may affect your device, and recommend that you contact the Department of Motor Vehicles of the States where you intend to market it.

We offer no opinion on the validity under Federal law of the other patented lighting devices discussed in the application.

If you have any questions, you may contact Taylor Vinson of this Office (202-366-5263).

Sincerely,

John Womack
Acting Chief Counsel

cc: Mr. Armenio N. Silva
     5110 Arendele Ave.
     Philadelphia, PA 19114

ref:108
d:2/25/97

1997

ID: 2658o

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

Dear Mr. Rossow:

This responds to your letter requesting an 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

/ NCC-20:EGlancy:mar:2/2/88:Wang l959o:62992:OCC 926 CONCURRENCE: NRM-0l, NEF-0l cc: NRM-0l, NEF-0l Redbook, Std. l2l Interps, Std. l2l

ID: 3080o

Open

Raymond M. Momboisse, Esq.
General Counsel
Immigration and Naturalization Service
U.S. Department of Justice
425 Eye Street, NW
Washington, DC 20536

Dear Mr. Momboisse:

Your letter of May 19, 1988, to the General Counsel of the Department of Transportation has been forwarded to this Office for reply. You request a waiver "exempting the Hummer vehicle from the Federal Motor Vehicle Safety Standards (FMVSS) when purchased directly from the manufacturer, AM General Corporation."

This response is based upon the information contained in your letter, and upon information my staff has obtained in telephone conversations with Ed Butkera of AM General Corporation, manufacturer of the Hummer, relating to its compliance with the Federal motor vehicle safety standards, and Gary Runyon of the Border Patrol, relating to the mission of that agency and the role the Hummer plays in it. According to our information, the Hummer is a vehicle which was developed specifically for, manufactured for, and sold exclusively to, the U.S. Army. The Border Patrol has bought Hummers from the Army because of certain features it finds advantageous in its operations, and its expanded missions involving interdiction of drugs. The principal reasons for your request are (1) that the Border Patrol desires to buy Hummers equipped with an assembly line addition (a central tire inflation system) is not incorporated on the Hummers sold to the Army, and (2) that, by buying directly from AM General Corporation, the Border Patrol will save $5,000 per vehicle, as the price of Army Hummers reflects the added expense of amortized development costs.

This agency has jurisdiction over "motor vehicles" as that term is defined by l5 U.S.C. 139l(3). If a vehicle is not a "motor vehicle," then the Federal motor vehicle safety standards do not apply to it. The exclusion of military vehicles from applicability of the safety standards in 49 C.F.R. 57l.7(a), which you quoted, is operative only if those vehicles would otherwise be "motor vehicles" required to comply with the standards.

Under l5 U.S.C. 1391(3), a "motor vehicle" is "any vehicle driven or drawn by mechanical power manufactured primarily for use on the public streets, roads, and highways...." The agency has interpreted this definition to exclude such vehicles as minibikes, golf carts, all-terrain vehicles, single seat racing cars used on closed courses, airport crash and rescue vehicles, and farm tractors. On the other hand, the agency has included in the definition farm trailers which haul produce over the public roads to processing centers, stock cars modified for racing unless such modifications are so extensive that the vehicle can no longer be licensed for use on the public roads, and vehicles capable of use both on rails and the public roads.

You have informed us that the Hummer will "generally only be used on public highways to travel between stations and assigned duty areas." However, you have also informed us that this will constitute approximately 30% of its operational time. Were we to consider this factor alone, we could not conclude that the Hummer was not a "motor vehicle." However, there are further factors that make the proper classification of the Hummer a close question. The Hummer was developed as a vehicle for military operations and not for civilian applications, its manufacturer does not advertise or sell it for civilian purposes, and its configuration is such that it probably could not be licensed for use on the public roads without modification of some of its original military specifications.

Resolution of this question is not necessary since the mission and method of operation of the Border Patrol provide a separate basis for concluding that the Hummers to be purchased by the Border Patrol are not subject to the FMVSS. We understand that one of the missions of the Border Patrol is to act as an agency of national security in protection of the country's borders to ensure that persons and goods enter and exit only through official Customs and Immigration stations, and that this role has become of paramount importance in the "war against drugs." In this enforcement effort, the Hummers of necessity carry firearms such as the M-l4 and M-16 rifles which the Army Hummer carries, can be equipped with military communications equipment enabling them to serve as command posts, and carry certain military equipment used for electronic interception and sensing movement. It further appears that in this mission the Border Patrol is not only equipped like a component of the Armed Forces of the United States, but also is trained and functions in many respects that are similar to such a component. Accordingly, for the purposes of applying the exclusionary phrase of 49 CFR 571.7(a), it is appropriate to regard the Border Patrol as being akin to a component of the Armed Forces of the United States. In consideration of the foregoing, the National Highway Traffic Safety Administration has concluded that AM General Corporation will not be in violation of the National Traffic and Motor Vehicle Safety Act if it manufactures and sells Hummers to the Border Patrol for its use as described in your letter.

Sincerely,

Erika Z. Jones Chief Counsel

/ref:VSA#101#571 d:l0/l8/88

1970

ID: 21871.ztv

Open



    Mr. Thomas C. Bliss
    3M Traffic Control Materials Division
    3M Center
    St. Paul, MN 55144-1000



    Dear Mr. Bliss:

    This is in reply to your letter of June 30, 2000, asking for interpretations of S5.7, Retroreflective Sheeting, of Federal Motor Vehicle Safety Standard No. 108, Lamps, Reflective Devices, and Associated Equipment.

    Several of your customers would like "to incorporate their company logo directly into the conspicuity markings used on their vehicles." You understand that "our customer is permitted to use their logo on markings placed on the vehicle in excess of the amount required to satisfy the minimum coverage stated in the regulation," and you ask that we confirm that interpretation.

    S5.7.1.4.2(a) requires that a strip of retroreflective sheeting, "originating and terminating as close to the front and rear as practicable," be applied to the side of trailers, but that "the strip need not be continuous as long as not less than half of the length of the trailer is covered. . . ." This exception is intended to accommodate different trailer configurations by allowing breaks in the conspicuity material where the features of the trailer are such that it may not be feasible to install continuous sheeting. A manufacturer must comply when half the trailer length is covered, but if it wishes to add more conspicuity material to the portion of the trailer length that is not covered, the material must comply with S5.7. We view the installation of nonconforming material on the side as subject to the prohibition in S5.1.3 that no additional reflective material or other motor vehicle equipment shall be added that impairs the effectiveness of lighting equipment required by the standard. For this reason, the appropriate question is, as you have asked in your first question, "do conspicuity markings that incorporate a logo conform to FMVSS 108?"

    First, because the standard requires conspicuity markings to be either red or white, the introduction of a third color (or white on a red section and vice versa) would not conform to Standard No. 108. Thus, any logo must be red or white. Assuming the logo is red or white, the answer is similar to that which we have provided inquirers as to whether logos are acceptable on the lens of the center high-mounted stop lamp. Both the lamp and retroreflective sheeting must meet the color and photometric requirements that are specified for each. If the sheeting meets the color, photometric, and all other requirements with the logo in place, then retroreflective sheeting incorporating a logo would comply with Standard No. 108. This, of course, would permit a logo that straddles red and white segments of retroreflective sheeting as well as a logo that is contained entirely within either a red or white segment. However, because the standard requires segments of red and white, a red logo could not appear in a white segment and vice versa. A logo (or portion of a logo) in a red segment could, however, be shown in a different shade of red, and a logo (or portion) in a white segment could be shown in a different shade of white, provided that both shades of red and both shades of white complied with the red and white color specifications of SAE J578c.

    Your next question is whether conspicuity markings that incorporate a logo would "qualify as conspicuity markings under FMVSS 108." S5.7 prescribes dimensions for the width of the sheeting and the length of the individual segments. As noted above, a logo could be inserted in otherwise conforming sheeting if the sheeting meets the photometric, color, and all other requirements with the logo in place.

    You have also asked whether "conspicuity markings that incorporate a logo [are] taken into account when assessing conformance to FMVSS standard 108." The coefficients for retroreflection of each segment of red and white sheeting must be not less than the minimum values specified in Fig. 29 of Standard No. 108. In determining conformance with S5.7, if a logo prevented a segment of sheeting from complying with the photometric or any other requirement, we would consider that the segment failed to comply with Standard No. 108. Thus, the answer to this question is yes.

    Finally, you have asked whether "a 48mm (2 inch) wide marking with a logo [which] conforms to the performance requirements necessary for DOT -C2, can . . . be considered DOT-C2 marking." The answer is no. S5.7.1.3(d) requires DOT -C2 sheeting to have a width of not less than 50mm. The sheeting in your question is 2mm too narrow to be DOT-C2, even if it meets the photometric requirements for DOT -C2 sheeting with the logo in place.

    If you have any questions, you may call Taylor Vinson of this Office (202-366-5263).



    Sincerely,

    Frank Seales, Jr.
    Chief Counsel

    ref:108
    d.10/6/00



2000

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.