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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 7441 - 7450 of 16514
Interpretations Date
 search results table

ID: nht91-6.46

Open

DATE: November 1, 1991

FROM: Paul Jackson Rice -- Chief Counsel, NHTSA

TO: Ronald Van Campenhout -- US Liaison Officer, ABC Coach/Van Hool

TITLE: None

TEXT:

This responds to your letter of August 29, 1991, asking for an interpretation of Motor Vehicle Safety Standard No. 108 as it applies to a situation you recently encountered in Florida.

You state that "one of our client's coaches was stopped by a DOT-inspector and a compliance-audit with FMVSS-standards was performed." According to the DOT inspector, "the third, centrally mounted, rear stoplight needs to be illuminated, not only when the brake pedal gets activated, but also whenever the coach is parked with the engine running at high idle speed . . . ." It is your interpretation that the center light "should only come on when pressure is applied to the brake pedal."

Standard No. 108, Lamps, Reflective Devices, and Associated Equipment, is the Federal motor vehicle safety standard (FMVSS) that applies to the center highmounted stop lamp. Standard No. 108 does not require that the center highmounted stop lamp be activated when a vehicle is parked with the engine running at idle. In fact, S5.5.4 of Standard No. 108 specifies that the center lamp shall be activated only upon application of the service brakes. Thus, your interpretation is the correct one.

There are other anomalies reported in your letter that I would like to address. First, Standard No. 108 does not require buses manufactured before September 1, 1993, to be equipped with a center highmounted stop lamp (and, after that date, only buses with a GVWR less than 10,000 pounds and less than 80 inches in overall width must be so equipped). Apparently, the inspector was not informed that the requirement for certain buses to be equipped with center highmounted stop lamps does not take effect for nearly two more years. Second, this agency has no inspectors performing compliance audits of vehicles in service. We surmise that your coach may have been inspected by either the Florida State DOT, or the U.S. DOT's Federal Highway Administration (FHWA) for compliance with the Motor Carrier Safety Regulations. The FHWA, which concurs in this letter, does not require in its Motor Carrier Safety Regulations or elsewhere that stop lamps on a bus be illuminated when the service brakes are not being applied, even if the vehicle is idling.

ID: nht91-6.47

Open

DATE: November 1, 1991

FROM: John C. Buonora -- Director, The City of New York Police Department, Motor Transport Division

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

TITLE: None

ATTACHMT: Attached to letter dated 12-3-91 from Paul Jackson Rice to John C. Buonora (A38; VSA 108(a)(2)(A))

TEXT:

As per our telephone conversation regarding the removal of the operating handle for the reclining mechanism of the 1991 Chevrolet police car split bench seat, I am requesting a written determination stating whether or not the removal of the operating handle violates the seat safety standard and any possible NYPD legal liability in the event of an accident.

Your cooperation in this matter is appreciated.

ID: nht91-6.48

Open

DATE: November 1, 1991

FROM: Sandra Mesh-Witucki -- Paralegal, McGraw, Borchard, & Martin

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

TITLE: Gettel

ATTACHMT: Attached to letter dated 12-10-91 from Paul Jackson Rice to Sandra Mesh-Witucki (A38; Std. 208)

TEXT:

In recapping our telephone conversation, this case involves a 1987 Chevrolet Cargo Van Conversion which was involved in an accident in which a vehicle driven northbound in the same southbound lane struck the van head-on.

Allegedly, a rear seat passenger suffered a spinal fracture from the lap belt.

I have enclosed the requested information: GBWR weight of 4,138 before conversion; invoice of the original manufacture; invoice of original purchase.

I have not been able to get a weight or weight estimate for the van following conversion.

Please forward a certified copy of all rules/standards applicable to this van both before and after conversion, and any other information you feel may be of assistance.

If any fee is involved in procuring this information, pleas forward your bill which will be paid promptly.

If there are any questions or more information is needed, please call.

Thank you.

ID: nht91-6.49

Open

DATE: November 1, 1991 EST

FROM: Joe S. Brito -- President, Preferred Custom Concepts Inc.

TO: Paul Jackson Rice -- NHTSA

TITLE: None

ATTACHMT: Attached to letter dated 01/07/92 (est) from Paul Jackson Rice to Joe S. Brito (A39; Std. 208)

TEXT:

This letter comes to you in hopes that you might be able to set many rumors to rest. We at Preferred Custom Concepts manufacture dash and door trim kits, overhead consoles, floor consoles as well as other accessories that are sold as aftermarket bolt-ons by custom shops or installed by people in the Truck and Van conversion industry.

The recent changes that have occured in the Truck and Van conversion industry regarding seats and seat belt restraints has also sparked rumors that this new laws will also regulate the use of wood in the interior of a converted vehicle.

We have yet to receive any official notification of any such changes nor have we seen or read any written material on this subject. Therefore, you can see our reason for this letter. Could you tell us, are there laws that are regulating the use of wood in custom interiors? If so what are these laws? Can you send me copy of any regulations that govern same? If not where might I be able to obtain a copy of these illusive documents.

We would greatly appreciate any and all help you may be able to offer us in solving this problem. Thank you.

ID: nht91-6.5

Open

DATE: September 19, 1991

FROM: Earl H. Kester -- President, Seatco

TO: Paul Jackson Rice -- Chief Counsel, NHTSA

TITLE: None

ATTACHMT: Attached to letter dated 10-23-91 from Paul Jackson Rice to Earl H. Kester (A38; Std. 208; VSA 108(a)(2)(A))

TEXT:

Seatco is a manufacturer of custom seating for the van, pickup and Surburban market both to bailment pool converters and to aftermarket accounts. My question concerning FVMSS 208 is directed to the aftermarket accounts. These are retail establishments that sell and install accessories on titled vehicles. Our opinion is that 208 compliance includes installing seats in a 1992 vehicle that falls under the 208 envelope. Our competition has taken the position that this is not true. There is a considerable difference in pricing based on a seat that will meet 208 standards and one that will not.

We need a ruling from NHSTA as to the proper position to take on compliance in our industry. The part of the law that we interpreted as compliance is under the section of " not rendering a safety item inoperable". Please respond as soon as possible as we are in grave need of a ruling.

ID: nht91-6.50

Open

DATE: November 1, 1991

FROM: Tadoru Yamamoto -- General Manager, Technical Administration Division, Hino Motors Ltd.

TO: Paul Jackson Rice -- Chief Counsel, NHTSA

TITLE: Questions on the Interpretation of FMVSS 113 "Hood & Latch System"

ATTACHMT: Attached to letter dated 1/13/92 from Paul Jackson Rice to Tadoru Yamamoto (A39; Std. 113)

TEXT:

Hino Motors, Ltd. is a Japanese manufacturer of heavy duty diesel trucks & buses. We export some kinds of trucks & buses to the United States.

We are now developing new model vehicles (cab-over type) which have a front panel. In designing the front panel, we have some questions on the interpretation of FMVSS 113 "Hood & Latch System."

It will be greatly appreciated if you would answer the attached questionnaire by Nov. 20, 1991 at the latest. If possible, we would like to receive your answer by facsimile. Our FAX No. is 011-81-0425-86-5006. I'm looking forward to your reply.

ID: nht91-6.51

Open

DATE: November 1, 1991

FROM: William E. Kenyon -- Mr. K's Original Headsaver, Patented Restraint Systems

TO: Chief Counsel, NHTSA

TITLE: Mr. K Headsaver (A Head Restraint System for Pickup Trucks)

ATTACHMT: Attached to letter dated 1/15/92 from Paul Jackson Rice to William E. Kenyon (A39; Std. 202)

TEXT:

Pursuant to a phone discussion with Dr. Carl C. Clark, NRD-12, I was advised to send this letter and Affidavit to your attention. We are the manufacturers of a universal, retrofit head restraint system for pickup trucks with bench seats.

Our head restraint has been on the market for four years and meets or exceeds the federal Standard 202 as shown in the enclosed Affidavit of Testing. We would like our product to be federally approved as an after-market safety product.

Please advise us at your earliest convenience if we have not met all requirements.

Attachment

AFFIDAVIT Confirmation of Test Results of Mr. K HeadSaver (A head restraint system for pickup trucks)

COUNTY OF MARICOPA) ) STATE OF ARIZONA )

I, William E. Kenyon, the undersigned, being first duly sworn, under oath, depose and say:

1. That I am the inventor and patent holder of US Patent #4,869,448, a Head Restraint for Vehicles.

2. That on the 29th day of October, 1991, a test was conducted of the Mr. K HeadSaver in the presence of your affiant and two witnesses.

3. That the head restraint used in the test is, in fact, the head restraint known as the Mr. K HeadSaver; that the manufacturer has warranted to your affiant that the head restraint does comply with Standard 202.

4. That this test is being conducted to show that the product known as the Mr. K Headsaver is in compliance with the 202 Standard and that said headrest meets the qualifications to be a federally approved aftermarket safety product.

5. That when installed, the headrest is 27.5 inches in height; the two end pads are 11" x 8-1/2"; pads are filled with extra- firm, high-density impact foam and covered with fabric.

6. That the following test was conducted:

US49, S571.101 Standard No. 202; Head restraints, S4.3(b):

(1) The top of the head restraint is 27.5 inches above the seating reference point.

(2) When measured either 2.5 inches below the top of the head restraint or 25 inches above the seating reference point, the lateral width of the head restraint is not less than 10 inches for use with bench seats.

(3) There was no displacement of the rearmost portion of the head form.

S5.2 Compliance with S4.3(b):

a. A test device was placed in accordance with (a).

b. A reference line was established.

C. A 9 inch diameter, 16 lb. spherical head form was used in producing a moment greater than 3,300 in.

lbs.

d. A Load was gradually increased to exceed 200 pounds.

The Mr. K HeadSaver was installed in a 1985 S10 Chevrolet pickup cut-a-way, with bench seats, for testing purposes.

Inspection of the headrest after testing found it to be in the same condition as before testing.

DATED this 29 day of October, 1991.

William E. Kenyon (Notary information is omitted)

ID: nht91-6.6

Open

DATE: September 23, 1991

FROM: Lawrence A. Beyer -- Esq.

TO: Paul Jackson Rice -- Chief Counsel, NHTSA

TITLE: None

ATTACHMT: Attached to letter dated 10-16-91 from Paul Jackson Rice to Lawrence A. Beyer (A38; VSA Sec. 112)

TEXT:

This office, as well as my clients, have been advised by an office of NHTSA that attorneys cannot submit documentation and make declarations on behalf of clients unless they submit formal power of attorney documentation which authorizes such representation.

I have been under the assumption that as an attorney I have the right to fully represent my clients before the federal government. Such representation includes the preparation and submission of completed documentation on their behalf.

Please advise me if, in order to represent my clients, it is NHTSA's policy that I have to provide proof to NHTSA that my statement that I represent a party is true.

Thank you for your time.

ID: nht91-6.7

Open

DATE: September 23, 1991

FROM: Gene Byrd -- Manager, Auto/Truck Div., Legris, Incorporated

TO: Vernon Bloom -- Office of Vehicle Safety Standards, NHTSA

TITLE: Re MOTOR VEHICLE SAFETY STANDARD NO. 106 (D.O.T. FMVSS 571-106 REV. 2/1/85); REFERENCE: SECTION S7.3.8 AIR PRESSURE & SECTION S8.7 AIR PRESSURE TEST

ATTACHMT: Attached to letter 12-5-91 from Paul Jackson Rice to Gene Byrd (A38; Std. 106)

TEXT:

WE REQUEST YOU ASSISTANCE IN CLARIFICATION OF THIS SECTION OF THE SPECIFICATION.

SECTION 7.3.8 READS AS FOLLOWS:

AN AIR BRAKE HOSE ASSEMBLY SHALL CONTAIN AIR PRESSURE OF 200 PSI FOR 5 MINUTES WITHOUT LOSS OF MORE THAN 5 PSI.

OUR QUESTION; IS THERE IS A TABLE THAT DEFINES WHAT THE PROPER LENGTH OF THE AIR BRAKE HOSE ASSEMBLY SHOULD BE FOR TEST PURPOSES?

MR. BLOOM, IF WE HAVE SENT THIS INQUIRY TO THE WRONG DEPARTMENT, WE REQUEST THAT YOU PLEASE FORWARD TO THE CORRECT PERSON.

SHOULD YOU HAVE ANY QUESTIONS OR COMMENTS PLEASE GIVE US A CALL.

WE THANK YOU FOR YOUR COOPERATION WITH THIS INQUIRY.

ID: nht91-6.8

Open

DATE: September 24, 1991

FROM: Wayne Trueman -- Plant Manager, BX-100 International

TO: Marvin Shaw -- Chief Counsel Office, U.S. DOT

TITLE: None

ATTACHMT: Attached to letter dated 9-16-91 from Paul Rice to Wayne Trueman (A38; Std. 121); Also attached to letter dated 7-31-91 from Wayne Trueman to Barry Felrice (OCC 6314)

TEXT:

This is in response to the letter of September 16, 1991 from Chief Counsel Paul Jackson Rice. I would like to thank Mr. Rice, yourself, and the other staff members who provided the information that went into the above letter.

One point that I believe needs clarification is the second sentence of paragraph one (copy enclosed). The BX-100 Brake Equalizer is NOT a valve, and has no impact what so ever on the axle to axle brake application timing. Having these units centrally installed between the brake chambers of EACH braking axle, only effects the air application at the individual axle ends into whose air system they are installed.

Per the Webster's New World Dictionary, a VALVE is: "Any device in a pipe or tube that permits a flow in one direction only, or regulates the flow of whatever is in the pipe, by means of a flap, lid, plug, etc. acting to open or block passage."

The function and intent of the BX-100 Brake Equalizer is simply to absorb brake system application PRESSURE variations. There is no air flow within this system once it is pressurized by the relay or quick release valve which also control the overall braking pressure applied to the brake ends. The only other pressure variations in the system are the various internal and externally induced air spikes. Having the BX-100 Brake Equalizers installed between the brake chambers, absorbs or removes the induced system air pressure variations. These high speed transient pressure variations during braking are normal and are caused by changes in the road surface, out of round brake drums, glazed brake pads, out of adjustment slack adjusters, and a host of other possibilities. The BX-100's absorb these variations and provide a more consistent brake application pressure which results in a decrease of heat production at the brake end and a resulting decrease in wear in all affected components. Since equal pressure is maintained, the driver retains complete control of his vehicle and is able to bring it to a shorter, safer, straight line stop.

Once again, thank you for your time and assistance in answering the various questions that I have submitted to your offices.

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.