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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 1531 - 1540 of 6047
Interpretations Date

ID: nht88-4.20

Open

TYPE: INTERPRETATION-NHTSA

DATE: 11/29/88

FROM: JAMES A. COWAN -- DIRECTOR OF ENGINEERING CROWN COACH INC

TO: ERIKA JONES -- CHIEF COUNSEL U.S. DEPARTMENT OF TRANSPORTATION NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION

TITLE: FMVSS 217 BUS WINDOW RETENTION AND RELEASE

ATTACHMT: ATTACHED TO LETTER DATED 01/09/90 FROM STEPHEN P. WOOD -- NHTSA TO JAMES A. COWAN -- CROWN COACH INC; REDBOOK A35; STANDARD 217; LETTER DATED 11/24/89 FROM JAMES A. COWAN -- CROWN COACH INC TO ERIKA JONES -- NHTSA; RE FMVSS 227, BUS WINDOW RETE NTION AND RELEASE; OCC 2847

TEXT: Dear Ms. Jones:

In a telephone conversation this morning with Marty J. Paliokes Safety Compliance Engineer for NHTSA, we were referred to your office for an interpretation regarding FMVSS 217, Bus Window Retention and Release. Our question regards figures 1 and 2 (p ages 418 and 419, CFR 49, Parts 400 to 999, October 1, 1985) of the subject regulation.

As background information, Crown Coach has developed a new transit style school bus based on our current production body shell. The current bus has been tested and certified for FMVSS 217 compliance as recently as March, 1988; see report no. 217-MSE- 87-10-TR7122-10 prepared under contract no. DTNH22-87-P-01028 for the Office of Vehicle Safety Compliance. Attachment 1 (photograph) shows the relationship of the seat at the emergency exit door to the door opening in this test.

In the new bus we have widened the door as shown in attachment 2 (Crown drawing E-504-278). Attachment 3 (photograph) shows the relationship of seats with the new door frame.

Our question regards the seat back in front of the seat at the emergency exit. Aforementioned figures 1 and 2 show a two inch (2") dimension between the access regions and the seat back forward of the emergency exit seat. This dimension is noted as "clearance area around seat back, arm rests, and other obstructions". With our wider opening, the entire seat back is in the emergency exit door opening. However, the actual minimum region area between the two seats are unchanged from the previous desi gn. We feel this wider opening is in full compliance with Part S5.2.3 of FMVSS 217.

An interpretation on this matter at your earliest convenience will be appreciated. Please call the undersigned at (714) 591-0567 if any additional information is required.

Very truly yours,

PHOTO GRAPHS OMITTED

ID: nht93-3.2

Open

DATE: April 14, 1993

FROM: Lanny Kness -- Coach Design Engineer, Chance Coach, Inc.

TO: John Womack -- Acting Chief Counsel, NHTSA

TITLE: Re: Interpretation of S5.1 and S5.3.3 of FMVSS 101

ATTACHMT: Attached to letter dated 7/7/93 from John Womack to Larry Kness (A41; Std. 101; Std. 108)

TEXT:

Chance Coach is a manufacturer of transit buses, and we are soliciting a written interpretation of two parts of FMVSS 101.

First, S5.1 divides specific motor vehicle controls into three categories: hand-operated controls, foot-operated controls, and displays. If a specific control is furnished, then is it required to be operated per the category's operation? For example: the turn signal control would be hand-operated, the service brake would be foot-operated and the highbeam control could be either hand- or foot-operated. Or should S5.1 be interpreted to mean: if a control is furnished and it is operated in this manner (hand- or foot-), then the following sections of S5.2 and S5.3 apply?

Currently, the turn signal controls of transit buses are mounted to the floor. This position has been used in the transit bus industry since FTA (then UMTA) issued the BASELINE ADVANCED DESIGN TRANSIT COACH SPECIFICATION (referred to as the "White Book"). As stated in the White Book, the turn signals are to be foot-operated momentary contact switches. Do foot-operated turn signals meet S5.1 of FMVSS 101?

A second interpretation is required on S5.3.3 of FMVSS 101. In a transit bus, the furnished controls are located on the dash, and they are illuminated by back lighting their identification. A dimmer switch provides illumination of the identifications over a continuous range. Typically, the windshield wiper/washer controls are provided by a vendor, and they are also installed on the dash. The windshield wiper/washer identifications are located on the control knobs, and they are not backlit. At night, the control knob's identifications are barely discernible from the indirect lighting coming from the other identifications and displays, and very discernible by turning the overhead driver's controlled light on. Does this comply with S5.3.3 of FMVSS 101?

Please contact me at (316) 941-1614, if additional information is needed.

Enclosure

Department of Transportation Urban Mass Transportation Administration BASELINE ADVANCED DESIGN TRANSIT COACH SPECIFICATIONS A Guideline Procurement Document for New 35- and 40-Foot Coach Designs November 1978 (pages II-35 through II-37) (TEXT OMITTED)

ID: nht73-5.17

Open

DATE: 04/04/73

FROM: AUTHOR UNAVAILABLE; R. B. Dyson; NHTSA

TO: Truck Trailer Manufacturers Association

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of March 19, 1973, asking whether a towbar dolly must be included in determining the overall length of semitrailers for compliance with Federal Motor Vehicle Safety Standard No. 108.

The answer is no. Standard No. 108 is a manufacturing standard, and semitrailers are not manufactured with dollies attached. 49 CFR @ 390.7, to which you refer, is a definition of the Bureau of Motor Carrier Safety which regulates the operation of certain motor vehicles, and since trailers often use converter dollies, it is understandable that that agency would deem a trailer with a dolly a "full trailer."

TRIAD SERVICES INC.

March 10, 1981

National Highway Traffic Safety Administration 400 7th St. S.W. Washington, D.C. 20590

Attn: Chief Counsel

This letter is to formally request your review and interpretation of Federal Motor Vehicle Safety Standard 108 as it relates to the placement of a clear lens cover in front of a motorcycle headlamp. The attached drawings demonstrate the specific concept in question.

Information contained in SAE standards referenced in Table III of FMVSS 108 indicates that a specific prohibition exists regarding a headlamp lens cover for passenger cars, multipurpose vehicles, trucks and busses. The SAE Motorcycle Headlamp Standard (SAE J584) contains no such prohibition. It is our understanding that a component configuration such as the one illustrated would not conflict with SAE referenced requirements.

Another section of FMVSS 108 which could relate to this issue is Paragraph S4.1.3 which states that "No . . . . automotive equipment shall be installed that impairs the effectiveness of lighting equipment required by this standard." If, when the secondary lens in question is in place, the photometric requirements of FMVSS 108 can be met or exceeded, the lens cover would then be compatible with the standard.

2

Detailed review of FMVSS 108 and the other Federal Motor Vehicle Safety Standards have revealed no other requirements germane to this issue.

Your review of our analysis will be most appreciated. We feel that the proposed concept is in keeping with the spirit as well as the letter of the law. Hopefully your review will confirm our opinion. Should you have any questions on this matter please do not hesitate to contact me.

Stephen W. Matson

[Enclosure Omitted.]

ID: nht92-6.50

Open

DATE: May 18, 1992

FROM: William E. Lawler -- Manager, Specifications, Indiana Mills & Manufacturing, Inc.

TO: Mary Versailles -- Office of Chief Counsel, NHTSA

TITLE: None

ATTACHMT: Attached to letter dated 7/23/92 from Paul J. Rice to William E. Lawler (A39; Std. 210)

TEXT:

Thank you for taking the time this afternoon to discuss some of the questions surrounding the inclusion of seat belt attachment hardware in the test requirements of FMVSS 210, "Seat Belt Assembly Anchorages". At your suggestion, we are submitting some questions to you for clarification so we can give appropriate guidance to our customers, the heavy truck OEM's as to how the FMVSS 210 test is to be performed and interpreted.

1. RETRACTOR FRAMES

a. If a test harness is used, can one end of the harness be attached to the attachment hardware (retractor frame), or must it be attached to the retractor spool?

b. If the harness must be attached to the spool, may it be attached around the spool as opposed to being inserted into the spool?

See Figure 1 (attached).

c. We assume it is the intent of the agency to test only the strength of the attachment hardware--not the locking mechanism of the retractor built in accordance with FMVSS 209.

2. BUCKLE ATTACHMENT

a. A commonly used design is the "cable buckle". The buckle assembly is positioned in convenient reach of the seat occupant by attaching the buckle to a cable by a method called swaging. The attachment hardware consists of a flat end containing a hole for an attaching bolt and a ferrule which is swaged to the cable. The ferrule and the flat end are made in one piece. See Figure 2 (attached).

Please confirm that the attachment ferrule bolted to the seat/ vehicle is what is required to withstand the forces dictated by FMVSS 210; separation of the cable from the ferrule would constitute malfunction of the test harness and not non-compliance to FMVSS 210.

b. Please confirm that the test harness could delete the buckle mechanism and attach directly to the upper end of the cable in the cable/ferrule assembly.

We appreciate your help in clarifying the interpretation of the standard with regard to these questions. As we discussed, we would appreciate receiving your answer by fax to save time.

Thank you for your help.

(Drawings omitted)

ID: GF004215

Open

    Giovanni Nifosi, Engineering Department Manager
    MITSUBA F.N. EUROPE s.p.a.
    via Aurelia Sud
    Localita Mortellini
    56010 Pisa
    Italy

    Dear Mr. Nifosi:

    This responds to your e-mail of June 14, 2004, to George Feygin of my staff. You ask whether Standard J590b adopted by the Society of Automotive Engineers (SAE) or S5.1.1.20 of the Federal Motor Vehicle Safety Standard (FMVSS) No. 108 specify the motorcycle turn signal lamp voltage drop limit.

    By way of background, the National Highway Traffic Safety Administration (NHTSA) issues FMVSSs applicable to new motor vehicles and motor vehicle equipment. Chapter 301 of Title 49 of the United States Code, "Motor Vehicle Safety" (49 U.S.C. 30101 et seq.), establishes a "self-certification" process under which all motor vehicle manufacturers, including motorcycle manufacturers, are responsible for certifying that their vehicles meet all applicable Federal motor vehicle safety standards.

    The Federal standard applicable to lighting equipment on motorcycles is FMVSS No. 108, Lamps, Reflective Devices and Associated Equipment. FMVSS No. 108 incorporates by reference many SAE standards including those regulating turn signal lamps. S5.1.1.19 of FMVSS No. 108 specifically incorporates the voltage drop and durability requirements in SAE J590b, Automotive Turn Signal Flashers (October 1965). However, S5.1.1.20 of FMVSS No. 108 provides an exception to the voltage drop requirement in SAE J590b. Specifically, S5.1.1.20 limits the voltage drop to .8 volts as opposed to .4 or .45 volts specified in SAE J590b.

    Accordingly, the voltage drop limit in S5.1.1.20 supercedes the voltage drop requirements in SAE J590b.

    I hope you find this information helpful. If you need further assistance, please contact George Feygin of my staff at this address or at (202) 366-2992.

    Sincerely,

    Jacqueline Glassman
    Chief Counsel

    ref:108 d.7/19/04

2004

ID: 08-006965a Acton

Open

Jonathan Acton II, Assistant Attorney General

Maryland Department of Transportation

Motor Vehicle Administration

6601 Ritchie Highway, N.E.

Glen Burnie, Maryland 21062

Dear Mr. Acton:

This responds to your letter asking whether a can of tire sealant and a method for reinflating a flat tire, in lieu of a spare tire, should be considered under Maryland law a technological improvement that conforms with applicable federal motor vehicle safety standards (FMVSS). As discussed below, we regret to inform you that we cannot answer your question since it is one of interpretation of state law that is not within the purview of this agency.

As you state in your letter, Maryland state law requires manufacturers to equip new cars sold in Maryland with a spare tire unless technological improvements, consistent with applicable [FMVSS], become available. Md. Code. Ann., Transp. 22-405.3 (2008). Your letter explains that a vehicle manufacturer is hoping to equip new vehicles with a can of tire sealant and a method for reinflating a flat tire in lieu of equipping the vehicle with a spare tire. You ask whether such equipment is a technological improvement that conforms with applicable [FMVSS].

Various FMVSS apply to spare tires. For example, all new spare tires must satisfy the requirements of FMVSS No. 109, New Pneumatic and Certain Specialty Tires (49 CFR 571.109), and be labeled in accordance with Part 574, Tire Identification and Recordkeeping (49 CFR Part 574). However, the National Highway Traffic Safety Administration (NHTSA) does not mandate that new vehicles must be equipped with a spare tire.

NHTSA could regulate the tire sealant as an item of motor vehicle equipment under the National Traffic and Motor Vehicle Safety Act, 49 U.S.C. 30101 et seq. See 49 U.S.C. 30102(a)(7) (defining, in relevant part, the term motor vehicle equipment as any system, part, or component of a motor vehicle as originally manufactured or any similar part or component manufactured or sold for replacement or improvement of a system, part, or component, or as any accessory, or addition to a motor vehicle ). However, NHTSA does not have an FMVSS that addresses tire sealants, nor have we made an agency determination that a tire sealant plus inflator is a technological improvement over a spare tire.



We believe that your letter asks a State law question: whether Maryland should consider the tire sealant plus inflator a technological improvement over a spare tire, permitting the new vehicle to be sold with the sealant and inflator instead of a spare tire. Since it is a matter of interpreting what Maryland officials had in mind when enacting the technical improvement provision, it is a question that Maryland state officials should answer, rather than NHTSA.

If you have any questions about the applicability of specific FMVSS provisions, we would encourage you to write us in greater detail regarding those questions.

If you have any further questions, please do not hesitate to contact Sarah Alves of my staff at (202) 366-2992.

Sincerely yours,

Stephen P. Wood

Acting Chief Counsel

ref:571

d.7/24/08

2008

ID: 06-006238as

Open

Mr. Charles I. Sassoon

Panor Corp.

125 Cabot Court

Hauppage, NY 11788

Dear Mr. Sassoon:

This responds to your letter regarding the permissibility of a combination Stop, Turn Signal, Taillamp (STT) and backup lamp under Federal Motor Vehicle Safety Standard No. 108, Lamps, Reflective Devices, and Associated Equipment (FMVSS). Based upon the information you provided the agency and the analysis below, we have concluded that your design incorporating 18 white Light Emitting Diodes (LEDs) on the outer perimeter of the STT would not be prohibited under FMVSS No. 108.

By way of background, the National Highway Traffic Safety Administration (NHTSA) is authorized to issue FMVSSs that set performance requirements for new motor vehicles and items of motor vehicle equipment (see 49 U.S.C. Chapter 301). NHTSA does not provide approvals of motor vehicles or motor vehicle equipment. Instead, manufacturers are required to self-certify that their products conform to all applicable safety standards that are in effect on the date of manufacture. FMVSS No. 108 specifies requirements for original and replacement lamps, reflective devices, and associated equipment. NHTSA selects a sampling of new vehicles and equipment each year to determine their compliance with applicable FMVSSs. If our testing or examination reveals an apparent noncompliance, we may require the manufacturer to remedy the noncompliance, and may initiate an enforcement proceeding if necessary to ensure that the manufacturer takes appropriate action.

The lamp you have designed consists of two areas, an inner area containing what appear, from your illustrations, to be nine LEDs, and an outer ring containing 18 white, 8 millimeter LEDs, which will serve as a backup lamp. You ask if there is any provision of FMVSS No. 108 which would prohibit this configuration.

The standard does not prohibit this combination lamp, as long as when a specific function is activated, the lamp performs that function in a manner that meets the minimum performance requirements established by Standard No. 108. It is the manufacturers



responsibility to confirm that the lamp meets all FMVSS No. 108 requirements relative to the functions for which the lamp is certified. We note that these issues have been raised in a 1990 letter to Mr. Suichi Watanabe,[1] and a copy of that interpretation has been included for your convenience.

If you have any more questions, please contact Ari Scott of my staff at (202) 366-2992.

Sincerely,

Anthony M. Cooke

Chief Counsel

Enclosure

d.3/5/07

ref:108




[1] 5/30/90 letter to Suichi Watanabe, available at http://isearch.nhtsa.gov.

2007

ID: 08-004771--Holt--10 Dec 08 rsy

Open

Mr. Harley Holt

Harley Holt & Associates, Inc.

1704 Random Stone Court

Reston, VA 20190-3251

Dear Mr. Holt:

This responds to your request for an interpretation of Federal Motor Vehicle Safety Standard No. 126, Electronic Stability Control Systems. You asked when a manufacturer is required to certify compliance with this standard if it passes the small volume manufacturer threshold of 5,000 vehicles in the middle of one of the September 1 to August 31 phase-in years. As discussed below, a manufacturer is subject to the regular phase-in requirements for the entire phase-in year if it manufactures more than 5,000 vehicles in that period.

By way of background information, the National Highway Traffic Safety Administration (NHTSA) is authorized to issue Federal motor vehicle safety standards (FMVSS) that set performance requirements for new motor vehicles and items of motor vehicle equipment. NHTSA does not, however, approve or certify any vehicles or items of equipment. Instead, the Safety Act establishes a self-certification process under which each manufacturer is responsible for certifying that its products meet all applicable safety standards. This letter interprets FMVSS No. 126 based on our understanding of the information you have provided.

You stated that you represent an importer of all-electric vehicles, and explained that the manufacturer of the vehicles has not yet begun to produce vehicles for the U.S., but will begin production sometime during 2009. You stated that the manufacturer did not anticipate producing more than 5,000 units during the first production year, i.e., September 1, 2008 through August 31, 2009. However, you stated further that production is expected to exceed 5,000 units sometime during the period from September 1, 2009 and August 31, 2011. You asked, therefore, on what date a manufacturer is required to certify compliance with FMVSS No. 126 if it exceeds the small volume limit of 5,000 units produced sometime during a production year from September 1 through August 31 of any of the three years of the phase-in period for that standard.



Paragraph S8.7 of FMVSS No. 126, Small volume manufacturers, states that

Vehicles manufactured during any of the three years of the September 1, 2008 through August 31, 2011 phase-in by a manufacturer that produces fewer than 5,000 vehicles for sale in the United States during that year are not subject to the requirements of S8.1, S8.2, S8.3, and S8.5.

49 CFR 571.126, S8.7. Thus, small volume manufacturers producing less than 5,000 vehicles for sale in the United States in a given phase-in year are not subject to the S8 phase-in requirements. However, if a manufacturer exceeds the 5,000 unit threshold for a phase-in year, it does not qualify as a small volume manufacturer for purposes of S8.7, and it is subject to the regular phase-in requirement for the entire phase-in year.[1] The 5,000-unit threshold was chosen to ensure that only manufacturers that are truly small volume are excluded from the phase-in requirements for ESC.

If you have any further questions, please feel free to contact Rebecca Yoon of my staff at (202) 366-2992.

Sincerely yours,

Anthony M. Cooke

Chief Counsel

ref:126

d.1/16/09




[1] We note that all vehicles manufactured on or after September 1, 2011 must comply with FMVSS No. 126, unless they are manufactured in two or more stages or are altered after having previously been certified, per S8.4 and S8.8. All vehicles, regardless of whether they are manufactured in two or more stages or are altered, must comply with FMVSS No. 126 by September 1, 2012, per S8.8.

2009

ID: Lorenz.2

Open

Mr. Steffen Lorenz

Webasto AG

Kraillinger Straβe 5

D-82131 Stockdorf

Germany

Dear Mr. Lorenz:

This responds to your e-mail in which you requested confirmation as to the permissibility of your sunroof design under our regulations, specifically one incorporating a number of solar cells intended to power a ventilator to help cool the occupant compartment. As shown in the attachment to your e-mail, we understand that your company intends to produce a sunroof with Item 2 glazing, which is tempered by a glazing manufacturer according to the specifications of the American National Standard for Safety Glazing Materials for Glazing Motor Vehicles and Motor Vehicle Equipment Operating on Land Highways Safety Standard ANSI Z26.1 (ANSI Z26.1) and which exhibits light transmissibility of greater than 70 percent. You further stated that crystalline solar cells enveloped in a laminate film would then be attached to the inner side of the glass panel, which would effectively diminish the light transmissibility of the glazing to zero percent. In addition, you stated that the sunroof design is such that the sunshade is affixed to the glass panel, thereby preventing occupants from touching the glass/laminate portion of the sunroof from the inside of the vehicle. Although we have not had the opportunity to examine your product in operation, from the information provided in your letter, we are of the opinion that it would be permissible, so long as it meets the applicable requirements of our safety standard on glazing materials. As discussed below, placement of opaque solar cells on the sunroof would not be prohibited, because there are no light transmittance requirements for sunroofs, since roof glazing is not in an area requisite for driver visibility.

By way of background, 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. To clarify, NHTSA does not provide approvals of motor vehicles or motor vehicle equipment, nor do we issue permits. Instead, it is the responsibility of manufacturers to certify that their products conform to all applicable safety standards before they can be offered for sale. The requirements concerning vehicle certification may be found at 49 CFR Part 567, Certification, and for items of glazing themselves, a prime glazing manufacturer certifies its glazing by marking it with the symbol DOT and the manufacturers code mark assigned by NHTSA (see 49 CFR 571.205 S6). NHTSA enforces compliance with the standards by purchasing and testing vehicles and equipment, and we also investigate safety-related defects.

Of particular relevance here, FMVSS No. 205, Glazing Materials, specifies, inter alia, strength and light transmittance performance requirements for various types of glazing used in motor vehicles, including sunroof applications. As you are aware, FMVSS No. 205 incorporates by reference ANSI Z26.1. Accordingly, prior to sale, a manufacturer must certify compliance of its product with the requirements of FMVSS No. 205, including those requirements incorporated from ANSI Z26.1.

Turning to the specifics of your sunroof design, we would first note that under FMVSS No. 205, Item 2 glazing is permitted to be used anywhere in the vehicle except the windshield, provided that it meets the relevant requirements incorporated under ANSI Z26.1. In order to sell the glazing or incorporate it in a new vehicle offered for sale in the United States, the manufacturer must self-certify that the glazing complies with Standard No. 205. As to placement of solar panels on the sunroof glazing, the standard would not prohibit such an application. FMVSS No. 205 contains no light transmittance requirements applicable to your glass sunroof because roof glazing is not in an area requisite for driver visibility.

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

Sincerely,

Anthony M. Cooke

Chief Counsel

ref:205

d.10/17/06

2006

ID: Lorenz2

Open

Mr. Steffen Lorenz

Webasto AG

Kraillinger Straβe 5

D-82131 Stockdorf

Germany

Dear Mr. Lorenz:

This responds to your e-mail in which you requested confirmation as to the permissibility of your sunroof design under our regulations, specifically one incorporating a number of solar cells intended to power a ventilator to help cool the occupant compartment. As shown in the attachment to your e-mail, we understand that your company intends to produce a sunroof with Item 2 glazing, which is tempered by a glazing manufacturer according to the specifications of the American National Standard for Safety Glazing Materials for Glazing Motor Vehicles and Motor Vehicle Equipment Operating on Land Highways Safety Standard ANSI Z26.1 (ANSI Z26.1) and which exhibits light transmissibility of greater than 70 percent. You further stated that crystalline solar cells enveloped in a laminate film would then be attached to the inner side of the glass panel, which would effectively diminish the light transmissibility of the glazing to zero percent. In addition, you stated that the sunroof design is such that the sunshade is affixed to the glass panel, thereby preventing occupants from touching the glass/laminate portion of the sunroof from the inside of the vehicle. Although we have not had the opportunity to examine your product in operation, from the information provided in your letter, we are of the opinion that it would be permissible, so long as it meets the applicable requirements of our safety standard on glazing materials. As discussed below, placement of opaque solar cells on the sunroof would not be prohibited, because there are no light transmittance requirements for sunroofs, since roof glazing is not in an area requisite for driver visibility.

By way of background, 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. To clarify, NHTSA does not provide approvals of motor vehicles or motor vehicle equipment, nor do we issue permits. Instead, it is the responsibility of manufacturers to certify that their products conform to all applicable safety standards before they can be offered for sale. The requirements concerning vehicle certification may be found at 49 CFR Part 567, Certification, and for items of glazing themselves, a prime glazing manufacturer certifies its glazing by marking it with the symbol DOT and the manufacturers code mark assigned by NHTSA (see 49 CFR 571.205 S6). NHTSA enforces compliance with the standards by purchasing and testing vehicles and equipment, and we also investigate safety-related defects.

Of particular relevance here, FMVSS No. 205, Glazing Materials, specifies, inter alia, strength and light transmittance performance requirements for various types of glazing used in motor vehicles, including sunroof applications. As you are aware, FMVSS No. 205 incorporates by reference ANSI Z26.1. Accordingly, prior to sale, a manufacturer must certify compliance of its product with the requirements of FMVSS No. 205, including those requirements incorporated from ANSI Z26.1.

Turning to the specifics of your sunroof design, we would first note that under FMVSS No. 205, Item 2 glazing is permitted to be used anywhere in the vehicle except the windshield, provided that it meets the relevant requirements incorporated under ANSI Z26.1. In order to sell the glazing or incorporate it in a new vehicle offered for sale in the United States, the manufacturer must self-certify that the glazing complies with Standard No. 205. As to placement of solar panels on the sunroof glazing, the standard would not prohibit such an application. FMVSS No. 205 contains no light transmittance requirements applicable to your glass sunroof because roof glazing is not in an area requisite for driver visibility.

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

Sincerely,

Anthony M. Cooke

Chief Counsel

ref:205

d.10/17/06

2006

Request an Interpretation

You may email your request to Interpretations.NHTSA@dot.gov or send your request in hard copy to:

The Chief Counsel
National Highway Traffic Safety Administration, W41-326
U.S. Department of Transportation
1200 New Jersey Avenue SE
Washington, DC 20590

If you want to talk to someone at NHTSA about what a request for interpretation should include, call the Office of the Chief Counsel at 202-366-2992.

Please note that NHTSA’s response will be made available in this online database, and that the incoming interpretation request may also be made publicly available.

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