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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 12951 - 12960 of 16517
Interpretations Date

ID: 77-5.2

Open

TYPE: INTERPRETATION-NHTSA

DATE: 12/12/77

FROM: AUTHOR UNAVAILABLE; Joseph J. Levin Jr.; NHTSA

TO: Gould; Reichert & Strauss

TITLE: FMVSR INTERPRETATION

TEXT: This confirms the substance of your November 2, 1977, meeting with Roger Tilton of my staff concerning the applicability of the new Federal school bus safety standards to common carriers used in urban and rural transportation.

You indicated in that meeting that you thought that the effect of the Urban Mass Transportation Administration's grant program to rural transit authorities would be to phase out the standard yellow school bus in favor of transporting children on rural transit buses. This situation would result in the avoidance of the Federal school bus regulations.

It is the opinion of the National Highway Traffic Safety Administration (NHTSA) that buses used by rural transportation districts to transport school children do not qualify for the limited exception from the school bus safety standards accorded to urban transportation common carriers.

The agency has traditionally excluded urban common carrier buses from the school bus requirements to allow transportation of school children on existing urban transportation facilities. The agency has never extended this exclusion to rural common carrier buses. In our notice on the redefinition of school bus (40 FR 60033) the NHTSA indicated that only urban transit buses would fall within the ambit of this limited exception. By that action, the agency intended to avoid the artificial development of rural transportation authorities that would result in the avoidance of the Federal school bus regulations.

In another comment you criticized the agency's adoption of a "use definition" for the applicability of the school bus regulations since the application of such definition depends upon the sales transaction to establish the intended use of the vehicle. You allege that enforcement of regulations dependent upon the sales transaction cannot be achieved.

The agency adopted the "use definition" for the regulation of school buses as a result of a Congressional directive in the Motor Vehicle and School Bus Safety Amendments of 1974 (Pub. L. 93-492). Congress defined school bus in a manner that requires the use of a vehicle to be considered. Accordingly, the agency must employ the "use definition" in regulating school buses. The NHTSA does not agree that the new regulations are unenforceable as a result of this regulatory approach. Enforcement of these regulations will be as vigorous as the enforcement of any other NHTSA regulation.

ID: 77-5.20

Open

TYPE: INTERPRETATION-NHTSA

DATE: 12/30/77

FROM: AUTHOR UNAVAILABLE; S. P. Wood for J. J. Levin, Jr.; NHTSA

TO: Nissan Motor Co., Ltd.

TITLE: FMVSS INTERPRETATION

TEXT: This responds to your October 4, 1977 letter asking whether Standard No. 118 Power-Operated Window Systems, prohibits the operation of power windows when the ignition key is in the "Accessories" position.

Standard No. 118 requires only that power windows be inoperable when the key is in the "off" position or is removed from the lock, with certain exceptions outlined in S3. It is permissible for the windows to operate normally when the key is in the "Accessories" position.

SINCERELY,

NISSAN MOTOR CO., LTD.

October 4, 1977

Joseph J. Levin Office of the Chief Counsel NHTSA

This letter is to ask for your interpretation concerning FMVSS 118 "Power-operated Window Systems".

S.3 of that standard requires that no power-operated window or partition shall be movable when the ignition key is in an off position or is removed from the lock.

In the case of the 5-position ignition switch as shown in the attachment, should the power-operated windows not be movable when the ignition key is in an "Acc" (Accessories) position?

Thank you for your attention to the above matter. We look forward to hearing your reply of the above in the near future.

Tokio Iinuma Staff Safety -- ENGINEERING OFC. OF NORTH AMERICA

Ignition switch

The 5-position ignition switch is located on the right side of the steering column. The switch includes the antitheft steering lock device and also controls the ignition system and most of the electrical equipment:

"LOCK" Normal parking position The ignition key can be inserted and removed at the "LOCK" position only. The steering can be locked by turning the key to the "LOCK" position, removing it, and rotating the steering wheel until the locking plunger clicks into position.

To unlock the steering, insert the key and turn it to the "OFF" position. For easier key operation when unlocking, rotate the steering wheel slightly to relieve pressure on the steering lock.

"OFF"

This position permits turning the engine off without locking the steering wheel.

"ACC" (Accessories)

This position allows you to use all the electrical accessories controlled by the switch.

"ON" Normal operating position

This position turns on the ignition system and electrical circuits.

"START"

This position starts the engine. After the engine has started, release the key. It will automatically return to the "ON" position.

(Graphics omitted)

ID: 77-5.21

Open

TYPE: INTERPRETATION-NHTSA

DATE: 12/30/77

FROM: AUTHOR UNAVAILABLE; J. J. Levin, Jr.; NHTSA

TO: W. G. Milby

TITLE: FMVSS INTERPRETATION

TEXT: This responds to your November 14, 1977, letter asking about the applicability of the requirements of Standard 217, Bus Window Retention and Release, to roof exits which use lexan or other glazing materials as part of their structure.

You first ask whether these exits would be required to comply with the standard's window retention test. Section S5.1 of the standard requires that each piece of window glazing and each surrounding window frame comply with the requirements of the window retention test. Since the lexan to which you refer is glazing material, a structure using such material would be required to comply with the window retention test.

In a second question, you ask whether this type of exit can employ a release mechanism that consists of a gasket filler strip. This gasket releases the exit when pulled, by a single force, in a direction perpendicular to the exit. Since the application of force required to release the exit is in the proper direction as established by S5.3.2 of the standard, the exit would appear to comply with the exit release requirements as long as the release mechanism is within the correct force application zone and requires the proper amount of energy to effect its release.

ID: 77-5.3

Open

TYPE: INTERPRETATION-NHTSA

DATE: 12/12/77

FROM: AUTHOR UNAVAILABLE; Joseph J. Levin Jr.; NHTSA

TO: COBEC Brazilian Trading & Warehousing Corp. of the U.S.

TITLE: FMVSR INTERPRETATION

TEXT: This is in reply to your letter of September 20, 1977, to Mr. Armstrong of this agency regarding the Puma kit car import program. Although your letter is not clear, you appear to be seeking an interpretation as to the applicability of our regulations to the Puma and its proper classification for import into the United States.

FACTS

Our opinion is based upon the factual representations made in your letter, in the advertising brochure issued by Puma Kit Cars, Inc., and an article "Brazilian Puma" by Thos. L. Bryant which appeared in the October 1977 issue of Road & Track (pp. 112-13). As we understand it, Pumas are shipped to the United States both as complete vehicles and in kit form. The completed vehicles are imported and sold by a Kansas firm. The kit vehicles on the other hand are imported by COBEC and sold to Puma Kit Cars, Inc. for further sale to individual purchasers.

The manufacturing operations that occur to the Puma kit car before it is exported are reported by Road & Track as:

"For normal production, Puma [Brazil] buys the [new VW] floorplan assemblies from the factory and removes 10 in. from its length . . . . All cables and fluid lines are removed and replaced with shorter versions. The modified chassis is then fed into the assembly line and if the final unit is to be sold locally, a finished car emerges from the other end. For those slated for export to the U.S. a few steps are left out. These consist of the installation of the front and rear ends and the engine. Aside from these omissions the completed cars are identical."

The completeness of the initial manufacturing process is highlighted in the Puma Kit Car Inc., brochure:

The Puma kit car is complete in every sense of the word: body, special floor pan, wiring, gas tank, rear torsion, steering wheel, tinted safety glass, roll up windows and plush upholstery. All you require in addition to the Puma kit is a VW ball joint front end, swing axle transmission, VW or Porsche engine, wheels, tires, and a battery."

The missing components are available from Puma Kit Car according to the brochure:

"In addition to the basic Puma Kit, complete factory engines, front end assemblies including disc brakes and brand new transaxle assemblies are available. You can assemble a new Puma car from off the shelf factory parts." CLASSIFICATION OF THE PUMA KIT CAR FOR IMPORTATION

COBEC commercial invoices of July 1977 show that Puma kit cars have been identified as "Replacement Body GTE for Volkswagen 1966" and "Replacement Chassis for Volkswagen 1966." The merchandise appears invariably identified as replacement equipment for 1966 Volkswagens.

As the Federal motor vehicle safety standards did not apply to passenger cars and equipment until January 1, 1968, it appears that COBEC is attempting to argue that the merchandise is not subject to Federal regulation under the National Traffic and Motor Vehicle Safety Act. But generally Federal standards covering replacement equipment apply as of the date the equipment is manufactured. Therefore, any item of motor vehicle equipment supplied in the Puma kit that is covered by a Federal motor vehicle safety standard (e.g. headlamps, glazing) must comply with it.

RESPONSIBILITY OF COBEC AS IMPORTER OF THE PUMA KIT CARS

If an equipment item does not comply, Pumas must be entered pursuant to 19 CFR 12.80(b)(2)(iii) as nonconforming motor vehicle equipment that will be brought into compliance before being offered for sale, and COBEC is responsible for submission of compliance documentation under 19 CFR 12.80(b)(2)(iii).

I hope that this is responsive to your request.

SINCERELY,

September 20, 1977.

Francis Armstrong, Director Office of Standards Enforcement Motor Vehicle Programs NHTSA, U.S. Department of Transportation

RE: PUMA KIT CAR IMPORT PROGRAM

With reference to the above-mentioned program we would like to express our opinion that these kits are in every way incomplete cars and, therefore, we so classified them on your Special Customs Invoice.

As per your request and for your own evaluation we enclose pictures as well as the following pertinent technical data about our kit car.

1. Our kit car consists of:

- fiber glass body shell,

- metal floor pan,

- AS1 safety glass (U.S. approved windshield),

- AS2 tempered glass, side and rear windows, - full set of dash control instruments,

- one set of seal beam headlights, (General Electric), U.S. made,

- one set of tale lights (U.S. approved).

2. Optional items:

- Seats and safety steering wheel.

3. Our vehicles do not include the following items:

- wheels,

- tires,

- front and rear axle,

- differential,

- transmission,

- motor,

- suspension components,

- steering components,

- break components,

- gas system,

- heating system.

These kits are intended to the sale to "DO IT YOURSELF MECHANIC" who in turn might have an old Volkswagen. By using components of the vehicle and the kit car it is possible to assemble. Within a time frame of 80 hrs., a small personal 2 (two) passenger car.

Please note that all of the service is accomplished by the owner himself. We feel that this explanation is sufficient for all your requirements, however, in case you need any additional information please do not hesitate to contact us.

Thank you for your prompt attention to this matter, since as of this moment we have ceased all current shipments into the U.S. until your final decision has been reached.

COBEC BRAZILIAN TRADING & WAREHOUSING CORP. OF THE U.S.

Egon Poisl Assistant Treasurer

(Graphics omitted) (Graphics omitted)

ID: 77-5.4

Open

TYPE: INTERPRETATION-NHTSA

DATE: 12/12/77

FROM: AUTHOR UNAVAILABLE; Joseph J. Levin Jr.; NHTSA

TO: Motor Coach Industries Inc.

TITLE: FMVSR INTERPRETATION

TEXT: This is in reply to your letter of October 27, 1977, with respect to distribution of a service bulletin on the subject of "New Generator Control and Low Air Switch Setting." As your inconsequentiality petition is now pending (Docket No. IP77-14) you have asked whether you may "hold further actions or procedures on [the] two items [discussed] pending the outcome" of the petition.

The NHTSA does not advise manufacturers to withhold corrective action while inconsequentiality petitions are pending. That decision must be made by the manufacturer as an independent exercise of its judgment. However, a company that has filed an inconsequentiality petition is not required to notify and remedy pursuant to the National Traffic and Motor Vehicle Safety Act until such time as its petition has been denied. Your service bulletin does not fulfill the requirements of 49 CFR Part 577 and if you issue it now, in the event of the denial of the petition you would be required to notify all owners of vehicles which remain uncorrected.

ID: 77-5.5

Open

TYPE: INTERPRETATION-NHTSA

DATE: 12/16/77

FROM: AUTHOR UNAVAILABLE; Joseph J. Levin Jr.; NHTSA

TO: Lowe Machine Company

TITLE: FMVSR INTERPRETATION

TEXT: This responds to your October 12, 1977, letter asking what regulations apply to you in your capacity as an alterer of motor vehicles.

The National Highway Traffic Safety Administration (NHTSA) promulgates safety standards for motor vehicles. The agency requires persons who alter motor vehicles prior to their first purchase for purposes other than resale to attach a label to each vehicle indicating that it continues to comply with all applicable safety standards. Therefore, if the modification that you intend to perform occurs prior to the first purchase of the vehicle for purposes other than resale, you would be required to attach such a label. I am enclosing a copy of Part 567, Certification (Volume 49 of the Code of Federal Regulations, Part 567) which addresses the responsibilities of vehicle alterers.

If you modify vehicles after their first purchase for purposes other than resale, then you need not attach a certification or alterer's label. However, section 108(a)(2)(A) of the National Traffic and Motor Vehicle Safety Act of 1966 (the Act) (15 U.S.C. 1381 et seq.) prohibits any repair business, dealer, distributor, or manufacturer from rendering inoperative any device or element of design installed on a vehicle in compliance with a safety standard. If your manufacturing operation affected the compliance of any aspect of the vehicle with safety standards in effect on the date of the vehicle's manufacture, you would be in violation of the Act and subject to civil penalties prescribed thereunder.

ID: 77-5.6

Open

TYPE: INTERPRETATION-NHTSA

DATE: 12/16/77

FROM: AUTHOR UNAVAILABLE; Joseph J. Levin Jr.; NHTSA

TO: Burley; Smiertka; Swank and Misko P.C.

TITLE: FMVSR INTERPRETATION

TEXT: This responds to your September 6, 1977, letter asking whether the requirements of the National Highway Traffic Safety Administration (NHTSA) apply to your client, an alterer of motor vehicles. From the description in your letter, it appears that your client intends to alter previously certified vehicles to make them accessible to the handicapped. You ask what, if any, regulations would apply to this alteration.

There are no safety standards applicable to the installation of the devices to which you refer. Your client's responsibility for purposes of compliance with the regulations of the NHTSA would be to ensure that he does not affect the compliance of previously certified vehicles.

If your client modifies certified vehicles prior to their first purchase for purposes other than resale, he would be responsible for ensuring that they continue to comply with all applicable motor vehicle safety standards. The applicable regulation, Part 567, Certification (49 CFR Part 567.7), requires that he attach an alterer's label to each vehicle indicating that the vehicle continues to comply with the safety standards.

If your client modifies vehicles after their first purchase for purposes other than resale, he would not have to attach an alterer's label to them. However, he would not be allowed to render inoperative any device or element of design installed in the vehicle in compliance with a motor vehicle safety standard (Section 108(a)(2)(A) of the National Traffic and Motor Vehicle Safety Act of 1966 (15 U.S.C. 1397). Thus, whatever manufacturing operation was performed by your client, it would be necessary for him to ensure that all aspects of the vehicle covered by motor vehicle safety standards remain in compliance with those standards.

ID: 77-5.7

Open

TYPE: INTERPRETATION-NHTSA

DATE: 12/20/77

FROM: AUTHOR UNAVAILABLE; J. J. Levin, Jr.; NHTSA

TO: General Motors Corporation

TITLE: FMVSS INTERPRETATION

TEXT:

Mr. David Martin Director of Automotive Safety Engineering General Motors Technical Center Warren, Michigan 48090

Dear Mr. Martin:

Please find enclosed a copy of a recent interpretation of Standard No. 121, Air Brake Systems, that may be relevant to your company's compliance efforts. The interpretation clarifies that service brake control modulation by the driver is permissible in evaluating compliance of a vehicle with S5.3.1 of the standard.

Joseph J. Levin, Jr. Chief Counsel

cc: Mr. W. E. Whitner

1-3-78 - LCL,RAR,DAM,RLL,DPD,GSB, RJD,MRB,CTT,JWS,RAW,WLW,JLM,WCC,DPR

DEC 20, 1977

Mr. Donald P. Weiher Chief Project Engineer - Safety AM General Corporation 32500 Van Born Road Wayne, Michigan 48184

Dear Mr. Weiher:

This responds to AM General's December 12, 1977, request to know whether modulation of the service brake control is permissible during stopping distance tests of an air-braked vehicle's compliance with S5.3.1 of Standard No. 121, Air Brake Systems. Modulation would be employed to prevent lockup of wheels above 10 mph, as required by S5.3.1. The other questions in your letter will be answered separately.

Section 5.3.1 does not limit the type of brake application that may be employed. When a test procedure or condition is not specified, the manufacturer is free to conduct that aspect of the test in any reasonable manner.

In this case, the standard requires compliance in one out of six attempts, which is intended to increase the test driver's familiarity with the vehicle for test purposes. Driver modulation occurs in the real world and is, in the agency's view, a reasonable procedure by which to demonstrate compliance. The normal skill of a test driver is anticipated in compliance testing.

Joseph J. Levin, Jr. Chief Counsel

ID: 77-5.8

Open

TYPE: INTERPRETATION-NHTSA

DATE: 12/21/77

FROM: AUTHOR UNAVAILABLE; J. J. Levin, Jr.; NHTSA

TO: Lucas Industries

TITLE: FMVSS INTERPRETATION

TEXT: This responds to Lucas Industries' November 1, 1977, request that the upcoming passive restraint requirements of Standard No. 208, Occupant Crash Protection, be amended to provide alternative compliance by means of installation of active lap and shoulder belts equipped with an ignition interlock system.

Section 125 of the National Traffic and Motor Vehicle Safety Act (the Act) provides in relevant part that "No Federal motor vehicle safety standard may . . . provide that a manufacturer is permitted to comply with such standard by means of . . . any safety belt interlock system." (15 U.S.C. 1410b(b)(1)). It is the agency's opinion that this provision operates as a strict prohibition on amendments of Standard No. 208 that would have the effect of permitting compliance by provision of an ignition interlock system. This opinion is confirmed by Conference Report language on @ 125 which states:

No matter what procedure is followed, the conference substitute prohibits the re-establishment of the safety belt interlock system or continuous buzzer as a mandatory or optional motor vehicle safety standard. H.R. Rep. 93-1452, 93rd Cong. 2d Sess at 45 (1974).

In view of this statutory prohibition, Lucas Industries' request for amendment of the upcoming requirements of Standard No. 208 cannot be considered by the agency.

SINCERELY,

Lucas Industries Inc

NOVEMBER 1, 1977

The Administrator National Highway Traffic Safety Administration

Subject Petition - Passenger Car Occupant Restraint

The Lucas Electrical Company Limited of Great Britain is, like ourselves, a subsidiary of Lucas Industries Limited.

Lucas Electrical, supported by us, feel that there should be an option to the passive restraint systems mandated in the early 1980's. We believe that, for some people, lap and shoulder belts with ignition interlock would provide a more acceptable alternative to the passive restraint systems presently being planned, and we ask that this option be considered.

A copy of the Lucas Electrical statement is attached.

A J Burgess Vice President (Technical)

cc: JAMES J. BLANCHARD -- HOUSE OF REPRESENTATIVES

AUGUST 22, 1977

Passive Restraint Systems - USA

Now that a regulation has been published requiring progressive introduction of passive restraint systems on new vehicles, it seems to us that the seat belt - ignition interlock system should be reconsidered.

This system had the blessing of NHTSA in terms of safety, who were unsuccessful in their attempts to prevent its withdrawal as a legal requirement in the USA. However, now that passive restraints can be anticipated the reasons for withdrawal of the interlock vanish, based as they were on avoiding the imposition of a requirement which was unpopular in some quarters. Should such a system be re-introduced, there would be no question of imposing it, and free choice could be exercised by any prospective buyer.

Thus, bearing in mind the undoubted safety potential of such a system, we propose that it be re-introduced based on the original technical requirements of NHTSA.

ID: 77-5.9

Open

TYPE: INTERPRETATION-NHTSA

DATE: 12/21/77

FROM: AUTHOR UNAVAILABLE; J. J. Levin, Jr.; NHTSA

TO: Office of Standards Enforcement

TITLE: FMVSS INTERPRETATION

TEXT: I have received your November 8, 1977, memorandum questioning the applicability of the performance requirements in Section S5.4 of Standard No. 217 to knock-out rear windows. You suggest that these requirements may apply only to push-out windows, not knock-out windows.

It is our interpretation that the requirements of the standard apply to both push-out and knock-out windows. We realize that this may create some difficulty for purposes of conducting compliance testing since knock-out windows must be reinstalled in order to conduct subsequent tests upon them. Nonetheless, the window should be required to comply with the standard.

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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