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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 561 - 570 of 2066
Interpretations Date
 search results table

ID: nht95-4.57

Open

TYPE: INTERPRETATION-NHTSA

DATE: October 14, 1995

FROM: Samuel J. Dubbin -- Chief Counsel, NHTSA

TO: Bob Clement -- U.S. House of Representatives

TITLE: NONE

ATTACHMT: Attached to 10/03/95 Letter from Bob Clement to Ricardo Martinez

TEXT: Dear Congressman Clement:

Thank you for your letter of October 3, 1995, enclosing correspondence from Mr. Dale Allen Pommer concerning his attempts to have a third seat belt installed in the back seat of his 1983 Chevrolet S-10 Blazer. Mr. Pommer has been told that this cannot b e done because of safety laws. You requested comments on Mr. Pommer's letter. As explained below, there is not Federal prohibition against the modification Mr. Pommer would like done to his vehicle. However, Federal law does place some limits on how t he modification is done. The installation of additional seat belts must be done in a way that does not compromise the performance of the existing seat belts.

Some background information about the agency may be useful. NHTSA has the authority to issue federal motor vehicle safety standards applicable to new motor vehicles and new items of motor vehicle equipment. Federal motor vehicle safety standards are mi nimum standards, and may be exceeded by manufacturers. Federal law prohibits the manufacture or sale of any new motor vehicle or new item of motor vehicle equipment which does not conform to all applicable Federal motor vehicle safety standards in effect at the time of manufacture.

After the first retail sale, there is a limit on the modifications that can be made by certain businesses to vehicles. Manufacturers, distributors, dealers, and repair businesses are prohibited from "knowingly making inoperative" any device or element o f design installed on or in a motor vehicle in compliance with an applicable safety standard (49 USC @ 30122). In general, the "make inoperative" prohibition would require a business which modifies motor vehicles to ensure that it does not remove, disco nnect, or degrade the performance of safety equipment installed in compliance with an applicable safety standard.

A safety belt is an item of motor vehicle equipment and all safety belts sold in the United States must be certified as complying with Standard No. 209, Seat Belt Assemblies, regardless of whether the belts are installed as original equipment in a motor vehicle or sold as a replacement part, Standard No. 209 sets forth strength, elongation, webbing width, durability, and other requirements for seat belt assemblies. The additional belt which might be added to Mr. Pommer's vehicle must comply with the re quirements of Standard No. 209.

In addition to Standard No. 209, the agency has issued two additional safety standards which apply to new vehicles and affect safety belts: Standard No. 208, Occupant Crast Protection, which sets forth requirements for occupant protection at the various seating positions in vehicles, and Standard No. 210, Seat Belt Assembly Anchorages, which establishes strength and location requirements for seat belt anchorages. The 1983 Chevrolet S-10 Blazer would have been required to have, at a minimum, a lap belt at each rear designated seating position.

A "designated seating position" is defined by NHTSA regulations as:

any plan view location capable of accommodating a person at least as large as a 5th percentile adult female, if the overall seat configuration and design and vehicle design is such that the position is likely to be used as a seating position while the vehicle is in motion . . . Any bench or split-bench seat . . . having greater than 50 inches of hip room (measured in accordance with SAE Standard J1100(a)) shall have not less than three designated seating positions.

Since the 1982 Chevrolet S-10 Blazer had a rear bench seat with 49.5 inches of hip room, that seat was required to have a minimum of two lap belts.

The "make inoperative" prohibition discussed earlier would not prohibit a business from adding a third seat belt to Mr. Pommer's vehicle. In addition, the anchorages would not have to comply with Standard No. 210. However, in adding the third seat belt , is is possible that the existing belts and anchorages would have to be relocated. The businesses contacted by Mr. Pommer may be concerned that the belts and anchorages could not be removed and replaced without "making inoperative" the compliance of th ose belts and anchorages.

I hope this information has been helpful.

ID: 17385.wkm

Open

Mr. William Daws
B & W Farm Center
7581 East Monroe Road (M-46)
Breckenridge, MI 48615

Dear Mr. Daws:

Please pardon the delay in responding to your letter to Walter Myers of my staff asking whether the antilock brake system (ABS) requirements of Federal Motor Vehicle Safety Standard (Standard) No. 121, Air brake systems (49 Code of Federal Regulations (CFR) 571.121), would apply to your truck glider kits. The answer is yes.

The agency's regulation with regard to the combination of new and used components is found at 49 CFR 571.7(e), Combining new and used components (copy enclosed), which provides in pertinent part:

When 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.

By its terms, therefore, paragraph 571.7(e) applies to specific situations in which a new cab or body is combined with used chassis components. Stated another way, the resulting vehicle will constitute a new vehicle unless the engine, transmission, and drive axle(s)are used and any two of those component came from the same vehicle. If, on the other hand, either the engine, transmission, and/or drive axle(s) are new or no two of them are from the same vehicle, then the vehicle is new. If the vehicle is considered new, it must be certified to meet all applicable safety standards (including ones requiring ABS) in effect as of the date of its manufacture (not the date the vehicle was ordered or delivered). See 49 CFR Part 567.

You also asked whether a truck is required to meet the Federal motor vehicle safety standards even if approximately 80 percent of its use will be off-road, in this case, farm use. The answer is yes.

Chapter 301 of Title 49, U.S. Code (U.S.C.)(hereinafter Act) authorizes this agency to establish Federal motor vehicle safety standards (FMVSS) applicable to new motor vehicles and new items of motor vehicle equipment. The Act defines "motor vehicle" as:

[A] vehicle driven or drawn by mechanical power and manufactured primarily for use on public streets, roads, and highways, but does not include a vehicle operated only on a rail line.

49 U.S.C. 30102(a)(6).

We have interpreted this language as follows. Vehicles that are equipped with tracks or are otherwise incapable of highway travel are plainly not motor vehicles. Agricultural equipment, such as tractors, are not motor vehicles. Further, vehicles designed and sold solely for off-road use (e.g., airport runway vehicles and underground mining vehicles) are not considered motor vehicles, even though they may be operationally capable of highway travel. On the other hand, vehicles that use the public highways on a necessary and recurring basis are motor vehicles. For instance, utility vehicles like the Jeep are plainly motor vehicles, even though they are equipped with special features to permit off-road operation. If a vehicle's greatest use will be off-road, but it will spend a substantial amount of time on-road, NHTSA has interpreted the vehicle to be a "motor vehicle." Further, if a vehicle is readily usable on the public roads and is in fact used on the public roads by a substantial number of owners, NHTSA has found the vehicle to be a motor vehicle.

Nothing in your letter suggests that your trucks should be treated any differently from any other trucks, which are clearly motor vehicles. We note that a particular customer's planned use would not ordinarily affect whether a vehicle is considered to be a motor vehicle. Moreover, even if your particular customers' planned use were relevant, 20 percent would represent a substantial amount of time on-road.

I am also enclosing for your information fact sheets entitled Information for New Manufacturers of Motor Vehicles and Motor Vehicle Equipment; Where to Obtain NHTSA's Safety Standards and Regulations; and Federal Requirements for Manufacturers of Trailers.

I hope this information is helpful to you. Should you have any further questions or need additional information, feel free to contact Mr. Myers of my staff at this address or at (202) 366-2992, fax (202) 366-3820.

Sincerely,
Frank Seales, Jr.
Chief Counsel
Enclosures
ref:121#567#568#571
d.12/4/98

1998

ID: nht79-4.23

Open

DATE: 10/22/79

FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA

TO: Uniroyal GmbH

TITLE: FMVSR INTERPRETATION

TEXT: This is in response to your letter of October 12, 1979, asking whether the character height of 5/32nds of an inch, stated in the Uniform Tire Quality Grading (UTQG) Standards (49 CFR 575.104, Figure 1), is considered by the National Highway Traffic Safety Administration (NHTSA) to specify the only acceptable height for UTQG sidewall molding, or whether the agency interprets this measurement as a minimum value.

The specification of 5/32nds of an inch tire sidewall characters was intended by NHTSA to establish a minimum requirement to assure readability of the UTQG information presented. The agency has no objection to the use of characters of a height greater than 5/32nds of an inch, so long as all characters used to convey UTQG information are of the same height.

ID: nht76-2.28

Open

DATE: 10/08/76

FROM: AUTHOR UNAVAILABLE; S. P. Wood for F. Berndt; NHTSA

TO: American Honda Motor Co., Inc.

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of September 23, 1976, asking for an interpretation of the spacing requirements for motorcycle turn signal lamps specified in Table IV of Motor Vehicle Safety Standard No. 108.

Standard No. 108 requires that motorcycle turn signal lamps be located so that their edges are at least 4 inches from the edge of the headlamps (on the front) and tail or stop lamps (on the rear). You have asked for confirmation "that the minimum separation distance is measured between the edges of the illuminated lenses of the respective lamps on a line passing through each lamp . . . rather than being measured on a horizontal line between two planes touching the edges of the illuminated lenses".

This will confirm your interpretation that the minimum separation distance is to be measured at the point where the edges of the two lamps are closest to each other.

ID: nht95-1.75

Open

TYPE: INTERPRETATION-NHTSA

DATE: February 24, 1995

FROM: David T. Holland -- President, Europa International, Inc.

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

TITLE: Via fax # 202-366-3820 RE: Request for clarification of passive restraint phase-in requirements of FMVSS 208.

ATTACHMT: ATTACHED TO 4/3/95 LETTER FROM PHILIP R. RECHT TO DAVID T. HOLLAND (A43; STD. 208)

TEXT: Dear Ms. Versailles,

This letter is to follow up our recent phone conversation where-in you acknowledged that if Europa International, Inc. (R91-002) imports Canadian specification MPV's, such as the Chrysler Minivan, that meets the MPV passive restraint phase-in requirement s of FMVSS 208, Europa will be in compliance as it can count these vehicles toward the required percentage.

Please acknowledge this letter by signing below and faxing back or by a letter from your office.

Thank you for your assistance.

Acknowledged by:

Mary Versailles Office of Chief Counsel, NHTSA

ID: nht89-1.70

Open

TYPE: INTERPRETATION-NHTSA

DATE: 04/13/89

FROM: ERIKA Z. JONES -- CHIEF COUNSEL NHTSA

TO: MABEL Y. BULLOCK -- ASSISTANT ATTORNEY GENERAL STATE OF NORTH CAROLINA DEPARTMENT OF JUSTICE

TITLE: NONE

ATTACHMT: LETTER FROM MABEL Y. BULLOCK AND LACY H. THORNBURG TO SUSAN SCHRUTH -- NHTSA RE WINDOW TINTING, FEDERAL PRE-EMPTION OF STATE REGULATIONS, OCC 2142; NORTH CAROLINA STATUTE REGULATING WINDOW TINTING; LETTER DATED 12/18/87 FROM LACY H. THORNBURG A ND MABEL Y. BULLOCK, SUBJECT MOTOR VEHICLES REGULATIONS OF DARK SHADED WINDOWS; PREEMPTION; LETTER DATED 05/06/88 FROM DAIRL BRAGG TO WILLIAM S. HIATT; LETTER DATED 10/28/82 FROM FRANK BERNDT -- NHTSA TO LAWRENCE T. HIROHATA, NOA-30; LETTER DATED 04/04/8 5 FROM JEFFREY R. MILLER TO ARMOND CARDARELLI; REGULATIONS DATED 07/01/85 EST, FEDERAL AUTO SAFETY LAWS AND MOTOR VEHICLE WINDOW TINTING.

TEXT: Dear Ms. Bullock:

Thank you for your letter to Ms. Susan Schruth of my staff, regarding North Carolina General Statute 20-127, Windshields must be unobstructed. I regret the delay in responding. You enclosed a copy of the statute, the regulations implementing it, a copy of a December 18, 1987 legal memorandum prepared by your department concluding that a State statute or regulation allowing 35% light transmittance through windows in motor vehicles would be preempted by current Federal safety laws and standards regulati ng this same subject matter, and a copy of a May 6, 1988 letter from the Motor and Equipment Manufacturers Association (MEMA) to Mr. William S. Hiatt, the Commissioner of Motor Vehicles for North Carolina, asserting that the North Carolina statute was no t preempted by Federal laws and regulations. You asked for my opinion as to whether the North Carolina statute conflicts with any provision of the National Traffic and Motor Vehicle Safety Act (15 U.S.C. @ 1381 et seq.) or with the Federal Motor Vehicle Safety Standards (49 CFR 571.1 et seq.).

Some background information on Federal motor vehicle safety laws and regulations may be helpful. As you are aware, our agency is authorized, under the National Traffic and Motor Vehicle Safety Act, to issue safety standards applicable to new motor vehic les and certain items of motor vehicle equipment. One of the standards that we have issued under this authority is Standard No. 205, Glazing Materials (49 CFR @ 571.205), which applies to all new vehicles and all new glazing materials for use in motor v ehicles. Among the requirements set forth in Standard No. 205 are specifications for minimum levels of light transmittance (70 percent light transmittance in areas requisite for driving visibility, which includes all windows in passenger cars).

Section 108(a)(1)(A) of the Safety Act (15 U.S.C. 1397(a)(1)(A)) specifies that, "No person shall manufacture for sale, sell, offer for sale, or introduce or deliver for introduction in interstate commerce, or

import into the United States, any motor vehicle or item of motor vehicle equipment manufactured on or after the date any applicable Federal motor vehicle safety standard takes effect under this title unless it is in conformity with such standard . . ." Because of this statutory requirement, any manufacturer, importer, or dealer that installs solar films or other sun screen devices on new glazing materials or the glazing installed in new vehicles must certify that the vehicle continues to comply with th e light transmittance and other requirements of Standard No. 205.

The requirement that a car comply with all applicable safety standards applies only until the car is first sold to a consumer. See section 108(b)(1) of the Safety Act (15 U.S.C. 1397(b)(1)). Both before and after a vehicle is first sold to a consumer, any modifications to the vehicle's windows, including tinting, are affected by section 108(a)(2)(A) of the Safety Act (15 U.S.C. 1397(a)(2)(A)). That section prohibits any manufacturer, dealer, distributor, or repair business from "rendering inoperative " any device or element of design installed in a vehicle in compliance with any safety standard. In the case of windows in a passenger car, this means that no manufacturer, dealer, distributor, or repair business could install a sun screen device or win dow tinting that would result in a light transmittance of less than 70 percent for any window of the car, or otherwise cause the car to no longer comply with the other requirements of Standard No. 205. Violations of this "render inoperative" prohibition can result in Federal civil penalties to the manufacturer, dealer, distributor, or repair business of up to $ 1000 for each noncomplying installation.

Please note that Federal law does not affect vehicle owners. Vehicle owners may alter their own vehicles and operate them on the highways as they please, even if the vehicle's windows no longer comply with the requirements of Standard No. 205. Hence, n o provision of a Federal statute or this agency's regulations prevents individual vehicle owners themselves from tinting the windows on their vehicles.

The authority of States to regulate glazing is affected by section 103(d) of the Safety Act (15 U.S.C. @ 1392(d)). This section provides that:

[whenever] a Federal motor vehicle safety standard established under this title is in effect, no State or political subdivision of a State shall have any authority either to establish, or to continue in effect, with respect to any motor vehicle or ite m of motor vehicle equipment any safety standard applicable to the same aspect of performance of such vehicle or item of equipment which is not identical to the Federal standard. Nothing in this section shall be construed as preventing any State from en forcing any safety standard which is identical to a Federal safety standard.

The effect of this provision of the Safety Act, with respect to the light transmittance requirements of Standard No. 205, is to expressly prohibit any State from specifying some level of light transmittance other than than 70 percent specified in Standar d No. 205 for new motor vehicles and

new glazing for the use in motor vehicles. Each of the individual States has authority to enforce identical standards (i.e., a minimum of 70 percent light transmittance) for new motor vehicles and new glazing for use in motor vehicles. Additionally, eac h of the individual States has the authority to regulate the modifications that may be made to vehicles by their owners and to establish requirements for vehicles to be registered in that State.

Having provided this background, we want to turn now to the results of our review of the North Carolina statute and regulations, along with your office's memorandum concluding that the statue is preempted by Federal law.

1. New vehicles and new glazing for use in vehicles. We concur with the conclusions in your memorandum that the North Carolina statute would be preempted if it specifies any requirements other than the requirements of Standard No. 205 (minimum of 70 per cent light transmittance) for new vehicles or few new glazing for use in motor vehicles. Section 108(a)(1) of the Safety Act and Standard No. 205 require all new vehicles and new glazing for use in motor vehicles to be delivered to the first purchaser w ith a light transmittance of at least 70 percent. Section 103(d) of the Safety Act expressly preempts any non-identical State standard on the subject of window tinting. Section 20-127(d) of the North Carolina statute appears to permit a single applicat ion of tinted film with a light transmittance of as little as 35 percent to be applied to vehicle glazing after factory delivery, but before sale to the public. This provision is preempted by Federal law, as is any other provision of North Carolina law which specifies that new glazing and glazing in new vehicles shall have some level of light transmittance other than the 70 percent minimum light transmittance requirement specified in Standard No. 205.

2. Modifications to vehicles and glazing by manufacturers, distributors, dealers and repair businesses after the first purchase of the vehicle or glazing in good faith for purposes other than resale. We concur with the conclusions in your memorandum tha t the North Carolina statute would be preempted by Federal law if it permits the commercial installation of sunscreen materials so that the combination of the sunscreen material and the existing glazing no longer meet the 70 percent light transmittance r equirement specified in Standard No. 205. This conclusion is based on the conflict between the North Carolina statute and the "render inoperative" provision of section 108(a)(2)(A) of the Safety Act. That provision prohibits any manufacturer, distributor , dealer, or repair business from rendering inoperative the compliance of a vehicle or an item of glazing with any of the requirements of Standard No. 205, including the minimum 70 percent light transmittance requirement.

Apart from the issue of preemption, I want to note that the provisions of State law cannot alter the effect of the "render inoperative" prohibition in Federal law. Regardless of how North Carolina law treats the combination of the glazing and the tintin g, if it results in less than 70

percent light transmittance, a manufacturer, distributor, dealer, or repair business that installed such tinting on a vehicle would be liable for the Federal civil penalty discussed above.

3. Modifications to vehicles and glazing by individual owners themselves after the first purchase of the vehicle or glazing in good faith for purposes other than resale. As noted above, Federal law does not regulate modifications that individual owners themselves make to their vehicles or glazing after the first purchase in good faith for purposes other than resale, even if those modifications result in the vehicles or glazing on longer complying with the requirements of Standard No. 205, including the requirement for at least 70 percent light transmittance. The State of North Carolina is free to establish whatever restrictions, if any, it deems appropriate on individual owner modifications, without regard to the requirements of Standard No. 205. To the extent that the North Carolina statute seeks to address these individual owner modifications, it would not be preempted by Federal law.

$4. Requirements for vehicles to be registered in the State of North Carolina. An individual State is free to establish whatever requirements it deems appropriate for vehicles to be registered in the State, provided that those State requirements would n ot prohibit the registration of vehicles that complied with the requirements of the Federal safety standards. Thus, the State of North Carolina is free to permit vehicles that do not comply with the requirements of Standard No. 205 to be registered in N orth Carolina. To the extent that the North Carolina window tinting statute seeks to establish requirements for vehicles to be registered in the State, it would not be preempted by Federal law.

We have also reviewed the May 6, 1988 letter from MEMA to Mr. Hiatt, in which MEMA discusses why it believes North Carolina's statute would not be preempted by Federal law. The MEMA discussion does not address the "render inoperative" provision in secti on 108(a)(2)(A) of the Safety Act, which prohibits commercial businesses from adversely affecting the compliance of elements of design installed in a vehicle or item of equipment in compliance with a safety standards, regardless of whether the vehicle is new or used. As was previously stated, Federal law prohibits any manufacturer, dealer, distributor, or repair business from ever installing window tinting material for the owner of a car if the combination of the original glazing and the tinting materi al results in less than 70 percent light transmittance through any window of the car.

To summarize, the North Carolina statute would be preempted to the extent that it seeks to permit some level of light transmittance other than that specified in Standard No. 205 for glazing in vehicles prior to the first purchase of the vehicles in good faith for purposes other than resale. Similarly, the statute would be preempted to the extent it seeks to permit the commercial installation of sunscreen materials with the result that the combination of the sunscreen material and the existing glazing n o longer complies with the requirements of Standard No. 205. However, the North Carolina statute would not be preempted to the extent that it seeks to regulate the modifications that owners themselves can make to

their vehicles or to the extent that it seeks to establish requirements for vehicles to be registered in the State, even if those requirements differ from those specified in Standard No. 205.

Sincerely,

ID: 1769y

Open

Mabel Y. Bullock, Esq.
Assistant Attorney General
State of North Carolina
Department of Justice
P. O. Box 629
Raleigh, NC 27602-0629

Dear Ms. Bullock:

Thank you for your letter to Ms. Susan Schruth of my staff, regarding North Carolina General Statute 20-127, Windshields must be unobstructed. I regret the delay in responding. You enclosed a copy of the statute, the regulations implementing it, a copy of a December 18, l987 legal memorandum prepared by your department concluding that a State statute or regulation allowing 35% light transmittance through windows in motor vehicles would be preempted by current Federal safety laws and standards regulating this same subject matter, and a copy of a May 6, 1988 letter from the Motor and Equipment Manufacturers Association (MEMA) to Mr. William S. Hiatt, the Commissioner of Motor Vehicles for North Carolina, asserting that the North Carolina statute was not preempted by Federal laws and regulations. You asked for my opinion as to whether the North Carolina statute conflicts with any provision of the National Traffic and Motor Vehicle Safety Act (15 U.S.C. /1381 et seq.) or with the Federal Motor Vehicle Safety Standards (49 CFR 571.1 et seq.).

Some background information on Federal motor vehicle safety laws and regulations may be helpful. As you are aware, our agency is authorized, under the National Traffic and Motor Vehicle Safety Act, to issue safety standards applicable to new motor vehicles and certain items of motor vehicle equipment. One of the standards that we have issued under this authority is Standard No. 205, Glazing Materials (49 CFR /571.205), which applies to all new vehicles and all new glazing materials for use in motor vehicles. Among the requirements set forth in Standard No. 205 are specifications for minimum levels of light transmittance (70 percent light transmittance in areas requisite for driving visibility, which includes all windows in passenger cars).

Section 108(a)(1)(A) of the Safety Act (15 U.S.C. 1397(a)(1)(A)) specifies that, "No person shall manufacture for sale, sell, offer for sale, or introduce or deliver for introduction in interstate commerce, or import into the United States, any motor vehicle or item of motor vehicle equipment manufactured on or after the date any applicable Federal motor vehicle safety standard takes effect under this title unless it is in conformity with such standard ..." Because of this statutory requirement, any manufacturer, importer, or dealer that installs solar films or other sun screen devices on new glazing materials or the glazing installed in new vehicles must certify that the vehicle continues to comply with the light transmittance and other requirements of Standard No. 205.

The requirement that a car comply with all applicable safety standards applies only until the car is first sold to a consumer. See section 108(b)(1) of the Safety Act (15 U.S.C. 1397(b)(1)). Both before and after a vehicle is first sold to a consumer, any modifications to the vehicle's windows, including tinting, are affected by section 108(a)(2)(A) of the Safety Act (15 U.S.C. 1397(a)(2)(A)). That section prohibits any manufacturer, dealer, distributor, or repair business from "rendering inoperative" any device or element of design installed in a vehicle in compliance with any safety standard. In the case of windows in a passenger car, this means that no manufacturer, dealer, distributor, or repair business could install a sun screen device or window tinting that would result in a light transmittance of less than 70 percent for any window of the car, or otherwise cause the car to no longer comply with the other requirements of Standard No. 205. Violations of this "render inoperative" prohibition can result in Federal civil penalties to the manufacturer, dealer, distributor, or repair business of up to $1000 for each noncomplying installation.

Please note that Federal law does not affect vehicle owners. Vehicle owners may alter their own vehicles and operate them on the highways as they please, even if the vehicle's windows no longer comply with the requirements of Standard No. 205. Hence, no provision of a Federal statute or this agency's regulations prevents individual vehicle owners themselves from tinting the windows on their vehicles.

The authority of States to regulate glazing is affected by section 103(d) of the Safety Act (15 U.S.C. /1392(d)). This section provides that:

[w]henever a Federal motor vehicle safety standard established under this title is in effect, no State or political subdivision of a State shall have any authority either to establish, or to continue in effect, with respect to any motor vehicle or item of motor vehicle equipment any safety standard applicable to the same aspect of performance of such vehicle or item of equipment which is not identical to the Federal standard. Nothing in this section shall be construed as preventing any State from enforcing any safety standard which is identical to a Federal safety standard.

The effect of this provision of the Safety Act, with respect to the light transmittance requirements of Standard No. 205, is to expressly prohibit any State from specifying some level of light transmittance other than the 70 percent specified in Standard No. 205 for new motor vehicles and new glazing for use in motor vehicles. Each of the individual States has authority to enforce identical standards (i.e., a minimum of 70 percent light transmittance) for new motor vehicles and new glazing for use in motor vehicles. Additionally, each of the individual States has the authority to regulate the modifications that may be made to vehicles by their owners and to establish requirements for vehicles to be registered in that State.

Having provided this background, we want to turn now to the results of our review of the North Carolina statute and regulations, along with your office's memorandum concluding that the statute is preempted by Federal law.

1. New vehicles and new glazing for use in vehicles. We concur with the conclusions in your memorandum that the North Carolina statute would be preempted if it specifies any requirements other than the requirements of Standard No. 205 (minimum of 70 percent light transmittance) for new vehicles or for new glazing for use in motor vehicles. Section 108(a)(1) of the Safety Act and Standard No. 205 require all new vehicles and new glazing for use in motor vehicles to be delivered to the first purchaser with a light transmittance of at least 70 percent. Section 103(d) of the Safety Act expressly preempts any non-identical State standard on the subject of window tinting. Section 20-127(d) of the North Carolina statute appears to permit a single application of tinted film with a light transmittance of as little as 35 percent to be applied to vehicle glazing after factory delivery, but before sale to the public. This provision is preempted by Federal law, as is any other provision of North Carolina law which specifies that new glazing and glazing in new vehicles shall have some level of light transmittance other than the 70 percent minimum light transmittance requirement specified in Standard No. 205.

2. Modifications to vehicles and glazing by manufacturers, distributors, dealers and repair businesses after the first purchase of the vehicle or glazing in good faith for purposes other than resale. We concur with the conclusions in your memorandum that the North Carolina statute would be preempted by Federal law if it permits the commercial installation of sunscreen materials so that the combination of the sunscreen material and the existing glazing no longer meet the 70 percent light transmittance requirement specified in Standard No. 205. This conclusion is based on the conflict between the North Carolina statute and the "render inoperative" provision of section 108(a)(2)(A) of the Safety Act. That provision prohibits any manufacturer, distributor, dealer, or repair business from rendering inoperative the compliance of a vehicle or an item of glazing with any of the requirements of Standard No. 205, including the minimum 70 percent light transmittance requirement.

Apart from the issue of preemption, I want to note that the provisions of State law cannot alter the effect of the "render inoperative" prohibition in Federal law. Regardless of how North Carolina law treats the combination of the glazing and the tinting, if it results in less than 70 percent light transmittance, a manufacturer, distributor, dealer, or repair business that installed such tinting on a vehicle would be liable for the Federal civil penalty discussed above.

3. Modifications to vehicles and glazing by individual owners themselves after the first purchase of the vehicle or glazing in good faith for purposes other than resale. As noted above, Federal law does not regulate modifications that individual owners themselves make to their vehicles or glazing after the first purchase in good faith for purposes other than resale, even if those modifications result in the vehicles or glazing no longer complying with the requirements of Standard No. 205, including the requirement for at least 70 percent light transmittance. The State of North Carolina is free to establish whatever restrictions, if any, it deems appropriate on individual owner modifications, without regard to the requirements of Standard No. 205. To the extent that the North Carolina statute seeks to address these individual owner modifications, it would not be preempted by Federal law.

4. Requirements for vehicles to be registered in the State of North Carolina. An individual State is free to establish whatever requirements it deems appropriate for vehicles to be registered in the State, provided that those State requirements would not prohibit the registration of vehicles that complied with the requirements of the Federal safety standards. Thus, the State of North Carolina is free to permit vehicles that do not comply with the requirements of Standard No. 205 to be registered in North Carolina. To the extent that the North Carolina window tinting statute seeks to establish requirements for vehicles to be registered in the State, it would not be preempted by Federal law.

We have also reviewed the May 6, 1988 letter from MEMA to Mr. Hiatt, in which MEMA discusses why it believes North Carolina's statute would not be preempted by Federal law. The MEMA discussion does not address the "render inoperative" provision in section 108(a)(2)(A) of the Safety Act, which prohibits commercial businesses from adversely affecting the compliance of elements of design installed in a vehicle or item of equipment in compliance with a safety standard, regardless of whether the vehicle is new or used. As was previously stated, Federal law prohibits any manufacturer, dealer, distributor, or repair business from ever installing window tinting material for the owner of a car if the combination of the original glazing and the tinting material results in less than 70 percent light transmittance through any window of the car.

To summarize, the North Carolina statute would be preempted to the extent that it seeks to permit some level of light transmittance other than that specified in Standard No. 205 for glazing in vehicles prior to the first purchase of the vehicles in good faith for purposes other than resale. Similarly, the statute would be preempted to the extent it seeks to permit the commercial installation of sunscreen materials with the result that the combination of the sunscreen material and the existing glazing no longer complies with the requirements of Standard No. 205. However, the North Carolina statute would not be preempted to the extent that it seeks to regulate the modifications that owners themselves can make to their vehicles or to the extent that it seeks to establish requirements for vehicles to be registered in the State, even if those requirements differ from those specified in Standard No. 205.

Sincerely,

Erika Z. Jones Chief Counsel

/ref:205#VSA d:4/4/89

1989

ID: nht72-5.29

Open

DATE: 08/21/72

FROM: AUTHOR UNAVAILABLE; Lawrence R. Schneider; NHTSA

TO: Oshkosh Truck Corporation

TITLE: FMVSR INTERPRETATION

TEXT: This is in response to your letter of July 5, 1972, requesting an opinion as to how manufacturers may take into account a vehicle's speed capability in establishing GAWR.

The Certification regulations do not specify particular speed criteria for establishing weight ratings. As a minimum, however, we believe the speed chosen should reflect the maximum speed at which it is reasonable to expect the vehicle to be driven. In the case where a vehicle is subject to some low-speed uses, such as seasonal use as a snow plow, we believe the figure on the certification label should be based on that use of the vehicle in which its expected speed is greatest. The regulations do not provide for variable ratings based on speed.

Finally, you ask whether cautionary labels dealing with GAWR and GVWR figures may be installed in the cab. The NHTSA does not object to the use of such labels. They may be used, as appropriate, to indicate permissable use of higher loads in low-speed applications.

ID: 9886

Open

AIR MAIL

Mr. S. Greiff PARS Passive Rhckhaltesysteme GmbH Borsigstrabe 2 63/55 Alzenau Germany

Dear Mr. Greiff:

This responds to your letter of April 19, 1994, requesting an interpretation of the 500 foot minimum runway length in the Laboratory Test Procedure for Federal motor vehicle safety standards Nos. 208, 212, 219, and 301.

Laboratory Test Procedures are provided to contracted laboratories as guidelines for conducting compliance tests. The Laboratory Test Procedures do not limit the requirements of the applicable Federal motor vehicle safety standards. None of the standards referenced in your letter include any requirement for minimum runway length. Instead, the standards specify that the collision into the fixed barrier will occur at any speed up to and including 30 mph.

I hope you find this information helpful. If you have any other questions, please contact Mary Versailles of my staff at this address or by phone at (202) 366-2992.

Sincerely,

John Womack Acting Chief Counsel

ref:208 d:6/8/94

1994

ID: nht71-1.11

Open

DATE: 03/29/71

FROM: AUTHOR UNAVAILABLE; E. T. Driver; NHTSA

TO: American Motors Corporation

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of March 12, 1971, to Mr. Lewis C. Owen of this office concerning an interpretation on your lens assembly, SF-3610703.

Federal Motor Vehicle Safety Standard No. 108 requires a minimum effective projected illuminated area for Class A turn signal lamps of 12 square inches on motor vehicles other than passenger cars and motorcycles. The subject lens assembly used in a turn signal lamp assembly with the opaque ornament does not appear to meet the 12 square inches minimum requirement. The calculations for the area, as determined by the method contained in our October 28, 1970, letter to Mr. E. W. Bernitt, were based on measurements of the ornament, because the detail dimensions were not supplied.

The backup lamp design you discussed in a telephone conversation with Mr. Owen also apparently does not meet the requirements of FMVSS No. 108. If you would like an interpretation on this backup lamp, please furnish information on the design similar to that supplied with the subject letter.

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.