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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 1111 - 1120 of 2914
Interpretations Date

ID: nht89-3.43

Open

TYPE: INTERPRETATION-NHTSA

DATE: 11/21/89

FROM: MICHAEL S. KMIECIK

TO: NHTSA

TITLE: NONE

ATTACHMT: ATTACHED TO LETTER DATED 05/30/90, DN A35 STD 215, FROM STEPHEN P. WOOD -- NHTSA TO MICHAEL S. KMIECIK; Alpha I GTO, Ferrari on Rice (article omitted)

TEXT: I would like to purchase several of these kits and produce a few cars for resale. I need an interpretation of Safety Standard 581. If Datsun is produced before Sept. 1, 1976 are used does this kit meet the requirements of Safety Standard 215. Also cou ld you please send me a copy of Safety Standard 215 and Safety Standard 108.

ID: nht73-1.38

Open

DATE: NOVEMBER 23, 1973

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

TO: Mr. James C. Martin

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of November 9 to the U. S. Department of Transportation concerning the operation of 4-way flashers and brake lights on a 1972 Toyota.

Since there is no requirement that the hazard warning signal (4-way flashers) be capable of operating independently of the stop signal, it is permissible for the stop signal to override the hazard warning signal. In fact, these signals on most passenger cars and multipurpose passenger vehicles manufactured in the United States operate similarly.

ID: nht89-1.76

Open

TYPE: INTERPRETATION-NHTSA

DATE: APRIL 18, 1989

FROM: WILLIAM SHAPIRO -- MGR., PRODUCT COMPLIANCE, VOLVO CARS OF NORTH AMERICA TO: ERIKA Z. JONES -- CHIEF COUNSEL, NHTSA

TITLE: REQUEST FOR INTERPRETATION, OUR LETTER JULY 11,1988

ATTACHMT: ATTACHED TO LETTER DATED 4-16-90 TO WILLIAM SHAPIRO FROM STEPHEN P. WOOD; (A35; STD. 210). ALSO ATTACHED TO LETTER DATED 7-11-88 TO ERIKA Z. JONES FROM WILLIAM SHAPIRO.

TEXT:

Enclosed is a copy of our July 11, 1988 letter re: FMVSS 210.

We would appreciate your reply as soon as possible because our engineering department is awaiting an answer.

Thank you for your attention.

Enc.

ID: nht80-1.41

Open

DATE: 03/26/80

FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA

TO: David Williams

TITLE: FMVSR INTERPRETATION

TEXT: I would like to clarify my remarks of March 17, 1980, with respect to the applicability of Federal motor vehicle safety standards to imported vehicles.

In that letter I implied that there was a prohibition against importing cars that didn't meet Federal standards and that such vehicles had to comply with standards in effect on the date of importation. Actually, a nonconforming vehicle may be imported under bond if it will be brought into compliance within 120 days of entry with all applicable standards in effect on the date of its manufacture.

ID: nht71-5.33

Open

DATE: 12/27/71

FROM: R. L. CARTER -- NHTSA; SIGNATURE BY E. DRIVER

TO: American Safety Belt Council

TITLE: FMVSS INTERPRETATION

TEXT: Thank you for your letter of December 3, 1971, regarding seat belt buckle requirements.

Your interpretation that push-button buckles are not mandatory on seat belts offered for sale as replacement parts after January 1, 1972, is correct. Federal Motor Vehicle Safety Standard No. 208, Occupant Crash Protection, specifies that seat belts, installed in passenger cars after January 1, 1972, must have latch mechanisms that release by push-button action. It does not apply to replacement belts.

If we can be of further assistance, please do not hesitate to contact us.

ID: nht90-1.47

Open

TYPE: INTERPRETATION-NHTSA

DATE: FEBRUARY 19, 1990

FROM: ANTHONY T. GREENISH -- U.N.D.P.

TO: U.S. DEPT. OF TRANSPORTATION

TITLE: NONE

ATTACHMT: ATTACHED TO LETTER DATED 4-25-90 TO ANTHONY P. GREENISH FROM STEPHEN P. WOOD; (A35; PART 591) TEXT:

I am presently contemplating purchasing a car in Europe and importing it when I return to the United States in July 1990. The two models I have in mind are:

1. The BMW model 324 d Diesel

2. The Honda model Accord 1.6 Ix

Any information you can provide as to how these cars rate as to motor vehicle safety standards would be very welcome.

ID: nht89-3.41

Open

TYPE: INTERPRETATION-NHTSA

DATE: NOVEMBER 21, 1989

FROM: MICHAEL S. KMIECIK

TO: NHTSA

TITLE: NONE

ATTACHMT: ATTACHED TO LETTER DATED APRIL 8, 1990 TO MICHAEL S. KMIECIK FROM STEPHEN P. WOOD; (A35; VSA 108(a)(2)(A); GRAPHICS OMITTED. TEXT:

I would like to purchase several of these convertible kits and produce a few cars for resale. I need to know the safety standards that apply to convertibles 1978 and older. I would also request an interpretation as to whether this conversion kit meets these standards. The main safety features of this kit seem to be:

1. reinforce windshield pillar with steel.

2. 1 in. steel tubing welded to shock towers.

3. 2 x 3 x 1-1/2 in. channel iron over the original unibody frame rails.

ID: nht93-1.9

Open

DATE: January 14, 1993

FROM: Jay Lee -- President, Pacific Agritrade Inc.

TO: Jackson Rice -- NHTSA, Department of Transportation

TITLE: None

ATTACHMT: Attached to letter dated 3-26-93 from John Womack to Jay Lee (A40; Std. 208; VSA 108(a)(2)(A))

TEXT: We would like to import air bags for cars and light trucks from Korea. This air bag can be installed very easily and we are interested in having this product tested by your department.

Please advise us on what procedures we need to take to have this product tested and approximately how long it will take.

We are also interested in knowing what we can claim after we pass your tests.

ID: nht67-1.15

Open

DATE: 02/27/67

FROM: AUTHOR UNAVAILABLE; William Haddon, Jr. M.D.; NHTSA

TO: Edward K. Kennedy, Esq.

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter of February 10, 1967.

Motor Vehicle Safety Standard No. 105 applies only to new passenger cars manufactured January 1, 1968, or later. Although the National Traffic Safety Agency intends to issue additional standards in the future that apply to items of motor vehicle equipment, most of the initial Motor Vehicle Safety Standards issued January 31, 1967, apply to vehicles only, as the application paragraph of each standard specifies.

Please do not hesitate to call upon us if we can be of further service to you.

ID: aiam4477

Open
Mr. Joseph F. Mikoll Vice President Transportation Equipment Corp. 712 North Van Buren Way Hopkins, MN 55343; Mr. Joseph F. Mikoll Vice President Transportation Equipment Corp. 712 North Van Buren Way Hopkins
MN 55343;

"Dear Mr. Mikoll: This responds to your recent request for confirmatio of your understanding that school buses with a gross vehicle weight rating (GVWR) of 10,000 pounds or less would comply with the existing requirements of the safety standards if those buses were equipped with a new occupant protection device your company is considering producing. As explained below, this device could not be installed in small school buses as a substitute for safety belts at those seating positions. Assuming those seating positions are equipped with safety belts, the seating positions could also be equipped with this device if the addition of the device does not prevent the safety belts from complying with the requirements of the safety standards. The new device you are considering producing is a 'safety bar.' This bar consists, in part, of two curved metal poles in planes that are parallel to the longitudinal centerline of the bus. These curved poles are joined by three cross members that are parallel to the seat and are covered with padding. The padded surface is angled at the top slightly back from the vertical. The curved metal poles are attached to the outside of the seat in front of the seat whose occupants will be protected by the 'safety bar,' so that the padded surface extends over the entire width of the seat whose occupants it is designed to protect. When the seat whose occupants are to be protected by this 'safety bar' is unoccupied, the padded surface rests approximately on the latitudinal centerline of the seat. When an occupant wishes to be seated, he or she must lift the 'safety bar' and then sit down. The 'safety bar' will then rest on the occupant's thighs. Additionally, a special strap that resembles a very long seat belt assembly must be fastened around the safety bar to hold it in position in the event of a crash. The crash protection requirements for school buses with a GVWR of 10,000 pounds or less are set forth in S5(b) of Standard No. 222, School Bus Passenger Seating and Crash Protection (49 CFR /571.222). That section provides that these school buses must be capable of meeting the requirements of Standard No. 208, Occupant Crash Protection (49 CFR /571.208) as it applies to multipurpose passenger vehicles, at all seating positions other than the driver's seat. The requirements of Standard No. 208 that apply to multipurpose passenger vehicles with a GVWR of 10,000 pounds or less are set forth in section S4.2 of Standard No. 208. That section specifies that multipurpose passenger vehicles with a GVWR of 10,000 pounds or less shall meet the requirements specified for passenger cars in either S4.1.2.1, S4.1.2.2, or S4.1.2.3 of Standard No. 208. Each of these three subsections of S4.1.2 requires each rear designated seating position to be equipped with a safety belt. S4.1.2 gives manufacturers the option of substituting a protection system 'that requires no action by vehicle occupants' for a safety belt at any or all rear designated seating positions. Your proposed 'safety bar' requires two specific actions by vehicle occupants, i.e., lifting the bar so that the seat can be occupied and buckling the strap to hold the bar in place. Therefore, the 'safety bar' could not be considered a protection system that 'requires no action by vehicle occupants,' for the purposes of S4.1.2 of Standard No. 208. Accordingly, each rear designated seating position in small school buses equipped with this 'safety bar' must also be equipped with safety belts. Assuming that these seating positions were equipped with safety belts, the installation of 'safety bars' in small school buses would be a voluntary action on the part of the school bus manufacturer. NHTSA has said in several prior interpretation letters that the systems or components installed in addition to required safety systems are not required to meet Federal safety standards, provided that the additional components or systems do not destroy the ability of required systems (the safety belts in this case) to comply with the Federal safety standards. If this is the case, the 'safety bars' could be provided as a supplement to safety belts on small school buses. To install these 'safety bars' in any new school bus, the manufacturer would have to certify that a bus with the 'safety bars' installed complied with the impact zone requirements set forth in S5.3 of Standard No. 222. Thus, if any part of the 'safety bar' was within the head protection zone or leg protection zone, the 'safety bar' would have to be certified as complying with the applicable requirements of S5.3. Additionally, the manufacturer would have to certify that the school buses with these 'safety bars' installed complied with Standard No. 217, Bus Window Retention and Release (49 CFR /571.217). Standard No. 217 requires school buses to be equipped with emergency exits of a minimum size. This means the 'safety bars' could not obstruct emergency exits located adjacent to seats. If you decide to manufacture these 'safety bars,' your company will be a manufacturer of motor vehicle equipment within the meaning of the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1381 et seq.). As such, you will have several responsibilities, including the responsibility specified in sections 151-159 of the Safety Act (15 U.S.C. 1411-1419) to conduct a notification and remedy campaign if your company or the agency determines either that the safety bar contains a defect related to motor vehicle safety or that it does not comply with an applicable safety standard. A copy of an information sheet is enclosed, which describes briefly this and other statutory and regulatory responsibilities of manufacturers and explains how to obtain copies of our regulations. Please let me know if you have any further questions or need additional information. Sincerely, Erika Z. Jones Chief Counsel Enclosure";

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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