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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 1721 - 1730 of 2914
Interpretations Date

ID: nht88-4.44

Open

TYPE: INTERPRETATION-NHTSA

DATE: 12/19/88 EST

FROM: ERIKA Z. JONES -- NHTSA CHIEF COUNSEL

TO: I. ROBERT EHRLICH -- ENGINEER

ATTACHMT: MEMO DATED 5-5-88, FROM I. ROBERT EHRLICH, TO RICHARD STROMBOTNE, OCC-2077

TEXT: This responds to your letter addressed to Dr. Richard Strombotne, concerning side impact protection. You requested copies of our two January 1988 proposals, and stated that you are particularly interested in whether or not the proposed standards would a pply to stretch limousines. According to your letter, these vehicles are frequently covered by light sheet steel to fill in the gap created by lengthening a conventional passenger car. You stated that this leaves a wide, unprotected gap in the center.

Enclosed are copies of the two proposals. Your question concerning whether the proposals would apply to stretch limousines is addressed below.

By way of background information, the National Traffic and Motor Vehicle Safety Act authorizes the National Highway Traffic Safety Administration (NHTSA) to issue safety standards for new motor vehicles and new motor vehicle equipment. All motor vehicles and items of motor vehicle equipment manufactured or imported for sale in the United States must comply with all applicable safety standards. Manufacturers of motor vehicles must certify compliance of their products in accordance with 49 CFR Part 567, C ertification.

Each safety standard applies to specified "types" of motor vehicles and/or motor vehicle equipment. Motor vehicles are classified into the following types: passenger cars, multipurpose passenger vehicles, trucks, buses, trailers and motorcycles. A defi nition for each motor vehicle type is set forth at 49 CFR Part 571.3.

The two January 1988 notices propose to amend Standard No. 214, Side Door Strength, to upgrade its test procedures and performance requirements. Those amendments, like the current version of Standard No. 214, apply only to passenger cars.

A person who stretches a completed passenger car prior to its first sale to a consumer is considered a vehicle alterer under NHTSA's certification regulation. Part 567.7, Requirements for Persons Who Alter Certified Vehicles, requires alterers to certify that the vehicle, as altered, complies with all applicable safety standards. One issue which sometimes arises when a vehicle is altered is whether it remains the same "type" of vehicle after the alteration, and thus subject to the same standards. We w ould assume ordinarily that the "stretching" of a passenger car would not change the vehicle's classification. Under this assumption, an alterer who stretches a passenger car would be required to certify that the stretched vehicle continues to meet all standards applicable to passenger cars, including Standard No. 214. Thus, in this situation, the proposed amendments would apply to stretch limousines.

I note that it is conceivable that an alterer may be able to demonstrate, depending on the nature of the overall alterations, including alterations other than stretching, that a passenger car which is stretched has changed classification and is considere d a multipurpose passenger vehicle or bus instead of a passenger car. If this were the case, the alterer would be required to certify that the vehicle complies with all standards applicable to the vehicle type for which it is now classified. This would not include Standard No. 214, since, as indicated above, that standard applies only to passenger cars.

A person who stretches a used passenger car is not considered a vehicle alterer and is not required to certify that the modified vehicle continues to meet applicable safety standards. However, manufacturers, distributors, dealers, or motor vehicle repai r businesses modifying a used vehicle are prohibited by section 108(a)(2)(A) of the Safety Act from knowingly rendering inoperative any device or element of design installed on or in a motor vehicle or item of equipment in compliance with an applicable F ederal motor vehicle safety standard.

I hope this information is helpful.

ENCLOSURES

ID: aiam3756

Open
Mr. P. T. Miller, 90 W. 79th Avenue, Liberty Square, P.O. Box G, Merriville, IN 46410; Mr. P. T. Miller
90 W. 79th Avenue
Liberty Square
P.O. Box G
Merriville
IN 46410;

Dear Mr. Miller: The Department of Commerce has forwarded your letter of September 27 1983, to Mr. Vinson of this office, for our reply. You have asked about Federal standards for motorcycle headlamps in connection with your investigation of an accident in Indiana involving a motorcycle reputedly equipped with 'a custom light approximately 2 1/2' by 5 '...smaller than a stock light.' Indiana Law requires that motorcycles be equipped with headlamps meeting Federal standards.; The principal Federal standard on motorcycle headlighting is SA Standard J584a, incorporated by reference in 49 CFR 571.108, Motor Vehicle Safety Standard No. 108. The standards do not list permissible sizes for motorcycle headlamps that are not sealed beam, specifying only that the light emitted comply with requirements at various photometric test points. Thus, the small size of the lamp in question is not indicative that it failed to meet Federal motorcycle requirements.; However, we are not aware that motorcycle headlamps are available i rectangular sizes smaller than those used on passenger cars, i.e., 4 inches by 6 inches. Perhaps the lamp in question was intended by its manufacturer for use as a driving lamp on passenger cars, its size is consistent with that type of lamp. But without further information I'm afraid we can be of no greater asistance (sic).; Sincerely, Frank Berndt, Chief Counsel

ID: aiam3326

Open
Mr. Patrick J. O'Connor, P.O. Box 905, 10 East Court Street, Doylestown, PA 18901; Mr. Patrick J. O'Connor
P.O. Box 905
10 East Court Street
Doylestown
PA 18901;

Dear Mr. O'Connor: This responds to your letter of July 2, 1980, requesting informatio regarding manufacturing standards for front bucket seats on passenger cars. Specifically, you ask if there are any standards that were applicable to 1969-model Mustangs, particularly with respect to the pivot pin brackets on seats in these vehicles.; The initial Federal Motor Vehicle Safety Standards were issued in 196 and became effective January 1, 1968. Included in these initial standards was Standard No. 207, *Anchorages of Seats--Passenger Cars* (copy enclosed). Standard No. 207 specifies performance requirements in terms of overall seat strength. You will note that there are no requirements for specific components of the seat, however, such as pivot pin brackets. The Federal safety standards are generally specified in terms of performance requirements which allow manufacturers to use any designs they choose. If the Mustang with which you are concerned was manufactured on or after January 1, 1968, the manufacturer would have had to certify that the vehicle was in compliance with all applicable safety standards, including Standard No. 207.; I am also enclosing a copy of Safety Standard No. 207 as it i currently written, since the standard has been amended several times since it was first issued. I hope you will find this information helpful.; Sincerely, Frank Berndt, Chief Counsel

ID: aiam5367

Open
Mr. Fred Carr, Engineer Utilimaster 65266 State Road 19 P. O. Box 585 Wakarusa, IN 46573-0585; Mr. Fred Carr
Engineer Utilimaster 65266 State Road 19 P. O. Box 585 Wakarusa
IN 46573-0585;

"Dear Mr. Carr: This responds to your question asking whether Federa Motor Vehicle Safety Standard No. 211, Wheel nuts, wheel discs, and hub caps, applies to 'motor vehicle equipment relating to light duty, medium duty, and heavy duty trucks or truck manufacturers.' As explained below, Standard No. 211 does not apply to trucks, or truck equipment. S2. Application of Standard No. 211 states the following: This standard applies to passenger cars, multipurpose passenger vehicles, and passenger car and multipurpose passenger vehicle equipment. 'Multipurpose passenger vehicle' is defined at 49 CFR 571.3 as a motor vehicle designed to carry 10 persons or less, which is constructed either on a truck chassis or with special features for occasional off-road operation. Since Standard No. 211 applies only to passenger cars, multipurpose passenger vehicles, and their equipment, Standard No. 211 does not apply to trucks, or truck equipment. 'Truck' is defined at 49 CFR 571.3 as a motor vehicle designed primarily for the transportation of property or special purpose equipment. Accordingly, manufacturers of trucks or truck equipment are not required to certify their trucks and truck equipment to the requirements of Standard No. 211. I hope this information is helpful. If there are any further questions, please contact Dorothy Nakama of my staff at (202) 366-2992. Sincerely, John Womack Acting Chief Counsel";

ID: nht68-1.24

Open

DATE: 05/09/68

FROM: SIGNATURE UNAVAILABLE; NHTSA

TO: Counihan, Casey and Loomis

TITLE: FMVSS INTERPRETATION

TEXT: Thank you for your letter of March 4, 1968, to Mr. Edwin L. Slagle, concerning Federal Motor Vehicle Safety Standard No. 205.

Standard No. 205 requires that glazing materials manufactured for use in passenger cars, multipurpose passenger cars, multipurpose passenger vehicles, trucks, buses, and motorcycles for sale in the United States on or after January 1, 1968, meet the requirements of ASA standard 226.1966. In addition, passenger cars, multipurpose passenger vehicles, trucks, buses, and motorcycles manufactured on or after January 1, 1968, for sale in the United States, must contain glazing materials that meet the requirements of ASA Standard 226.1-1966.

The following information is offered in answer to your qeustions:

Q. "We would appreciate your advice as to whether under Section (sic) 205, our members may install windshields manufactured prior to January 1, 1968, and containing a plastic interlayer of 0.015" subsequent to January 1, 1968?"

A. Yes, preformed or presized windshields manufactured prior to January 1, 1968, of 0.015 plastic interlayer may be used as replacement glass in used vehicles after January 1, 1968.

Q. "We would also appreciate your advice as to whether the fact that a glass dealer cuts a windshield to size from material manufactured prior to January 1, 1968, would alter your answer to our first question."

A. A dealer who cuts a windshield to size is considered a manufacturer, hence after January 1, 1968, 0.015 plastic interlayer

[Page 2 Is Missing.]

ID: aiam1726

Open
Mr. Robert L. Donnelly, Secretary, Armstrong Rubber Company, New Haven, Connecticut 06507; Mr. Robert L. Donnelly
Secretary
Armstrong Rubber Company
New Haven
Connecticut 06507;

Dear Mr. Donnelly: This responds to your letter of May 30, 1975, concerning the standard applicable to a tire which you manufacture and sell with the designation L78-15LT, Load Range C.; You are mistaken in your assumption that a station wagon is classifie as a multi-purpose passenger vehicle. Because it is constructed neither on a truck chassis nor with special features for occasional off-road operation, a station wagon is a passenger car rather than a multi-purpose passenger vehicle.; If, despite this misunderstanding, the L78-15LT tire in question i designated by you as primarily intend for use on lightweight trucks or multi-purpose passenger vehicles, then it is a light truck tire subject to Federal Motor Vehicle Safety Standard No. 119, *New Pneumatic Tires for Vehicles Other than Passenger Cars*.; Because a station wagon is a passenger car, Standard No. 110 require that its original equipment tires comply with Standard No. 109. Standard No. 110 is not applicable to used cars, so there is no prohibition on the use of the L78-15LT tire as replacement equipment on a station wagon. However, because the informational placard on a station wagon would suggest to its owner the use of inflation pressures which are dangerously inadequate for light truck tires, we do not wish to encourage the sale of such tires as replacement equipment for use on station wagons.; Sincerely, Frank A. Berndt, Acting Chief Counsel

ID: aiam0265

Open
Mr. B. Borisoff, Consulting Engineer, 5403 Blanco Avenue, Woodland Hills, CA 91364; Mr. B. Borisoff
Consulting Engineer
5403 Blanco Avenue
Woodland Hills
CA 91364;

Dear Mr. Borisoff: Reference is made to your letter of October 14, 1970 to Secretary Volp regarding our Consumer Information publication.; Concerning your comments on stopping distance, the wording used on pag 4 is the exact wording of this regulation. The category 'Stopping distance in feet with emergency brakes (partial service brake system)' is a generalization of the regulatory wording meant to convey the sense of this requirement to a consumer who may have no engineering background. The paragraph on page 193 paraphrases the regulatory wording. The title 'Partial Failure on One System' is, again, meant to convey the meaning to an otherwise uninformed consumer. I trust this clarifies the situation for you.; The reason many motorcycles are not listed is the fact that the dat was not received in time to be included in the book. I am enclosing copies of the data available for U.S. made motorcycles as you requested.; Volume 2, covering the 1971 makes and models will be availabl approximately November 15, 1970 and can be obtained from the Government Printing Office at a cost of $2.00. In addition two (2) new Consumer Aid publications entitled 'BRAKES - A Comparison of Braking Performance for 1971 Passenger Cars' and 'TIRES - A Comparison of Tire Reserve Load for 1971 Passenger Cars' will also be available at a cost of $.40 each.; Many thanks for your kind words and your interest in our motor vehicl safety program.; Sincerely, Rodolfo A. Diaz, Acting Associate Director, Motor Vehicl Programs;

ID: aiam1550

Open
Mr. George R. Semark, Safety Engineer-Vehicles, Transportation Equipment Group, Vehicle Development Center, Sheller-Globe Corporation, 2885 St. Johns Avenue, Lima, OH 45804; Mr. George R. Semark
Safety Engineer-Vehicles
Transportation Equipment Group
Vehicle Development Center
Sheller-Globe Corporation
2885 St. Johns Avenue
Lima
OH 45804;

Dear Mr. Semark: This is in response to your letter of May 15, 1974, requesting tha vehicles which seat 10 persons or less, but are of the same base design as buses specifically designed as school buses, be classified as school buses regardless of their intended use.; The vehicles that would be affected by the reclassification you reques are currently categorized as multipurpose passenger vehicles, since they provide seating positions for 10 persons or less. In general, the multipurpose passenger vehicle category is subject to more stringent safety requirements than either the bus or the school bus categories. Further, additional standards are becoming effective for multipurpose passenger vehicles in the near future as part of the NHTSA's overall plan to extend the requirements presently applicable to passenger cars. Thus, multipurpose passenger vehicles can expect increasingly higher safety performance levels, comparable to those of passenger cars.; Vehicles used to transport handicapped children should not b reclassified in such a way as to reduce the number or the stringency of the requirements to which they are subject.; On the basis of the above reasons, the NHTSA has concluded that th vehicles about which you are petitioning should not be reclassified as school buses and your petition is therefore denied.; Sincerely, Robert L. Carter, Associate Administrator, Motor Vehicl Programs;

ID: aiam3405

Open
Mr. James J. Schultz, Severy, Incorporated, 2233 El Segundo Boulevard, El Segundo, CA 90245; Mr. James J. Schultz
Severy
Incorporated
2233 El Segundo Boulevard
El Segundo
CA 90245;

Dear Mr. Schultz: This responds to your recent letter asking whether a 4-wheel driv pickup truck must comply with Safety Standard No. 216, *Roof Crush Resistance*. You also ask whether the definitions of vehicle classification under Federal regulations are mutually exclusive.; The application section of Safety Standard No. 216, section 3 specifies that the standard applies to passenger cars. This means that the standard applies *only* to passenger cars. Therefore, the standard does not apply to a pickup truck.; The definitions of the basic vehicle classifications found in 49 CF Part 571.3 are mutually exclusive. If a vehicle falls within the definition of a 'truck,' the vehicle is not also within the definition of a 'passenger car.' The definition of a passenger car does not specifically exclude trucks because the definition is based on the function of the vehicle. Thus, a passenger car is defined as a motor vehicle designed for carrying persons. A truck, on the other hand, is defined as a vehicle designed primarily for the transportation of property or special purpose equipment. Since a pickup is designed primarily for carrying property and not persons, it is a truck and not a passenger car. Each motor vehicle has a certification label attached to its door which specifies the vehicle's classification.; I hope this has clarified any questions you had concerning vehicl classification under the Federal Motor Vehicle Safety Standards.; Sincerely, Frank Berndt, Chief Counsel

ID: aiam2037

Open
Mr. Robert L. Donnelly, Secretary, Armstrong Rubber Company, New Haven, Connecticut 06507; Mr. Robert L. Donnelly
Secretary
Armstrong Rubber Company
New Haven
Connecticut 06507;

Dear Mr. Donnelly: This responds to your letter of may 30, 1975, concerning the standard applicable to a tire which you manufacture and sell with the designation L78-15LT, Load Range C.; You are mistaken in your assumption that a station wagon is classifie as a multi-purpose passenger vehicle. Because it is constructed neither on a truck chassis nor with special features for occasional off-road operation, a station wagon is a passenger car rather than a multi-purpose passenger vehicle.; If, despite this misunderstanding, the L78-15t tire is question i designated by you as primarily intended for use on lightweight trucks or multi-purpose passenger vehicles, the it is a light truck tire subject to Federal Motor Vehicle Safety Standard No. 119, *New Pneumatic Tires for Vehicles Other than Passenger Cars*.; Because a station wagon is a passenger car, Standard No. 110 require that its original equipment tires comply with standard No. 109. Standard No. 110 is not applicable to used cars, so there is no prohibition on the use of the L78-15LT tire as replacement equipment on a station wagon. However, because the informational placard on a station wagon would suggest its owner the use of inflation pressures which are dangerously inadequate for light truck tires, we do not wish to encourage the sale of such tires as replacement equipment for use on station wagons.; Sincerely, Frank A. Berndt, Acting Chief Counsel

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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