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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 15731 - 15740 of 16490
Interpretations Date

ID: aiam0446

Open
Mr. H.W. Gerth, General Manager, Product Engineering and Service, Mercedes Benz of North America, Inc., 158 Linwood Plaza, Port Lee, NJ 07024; Mr. H.W. Gerth
General Manager
Product Engineering and Service
Mercedes Benz of North America
Inc.
158 Linwood Plaza
Port Lee
NJ 07024;

Dear Mr. Gerth: This is in reply to your letter of August 20, 1971, in which you aske whether the shoulder belt anchorages installed by Mercedes in its heavy trucks (over 10,000 GVWR) must meet the strength requirements of Standard No. 210, even though the standard does not require shoulder belt anchorages in vehicles over 10,000 pounds GVWR.; It is our opinion that because these anchorages are not required to b installed, they are not required to meet the strength requirements of Standard No. 210. You may therefore continue to use plastic covers on the anchorages and need not render them unusable.; Please advise us if you have further questions. Sincerely, Lawrence R. Schneider, Chief Counsel

ID: nht92-8.6

Open

DATE: April 3, 1992

FROM: Herr Spingler -- Entwicklung Lichttechnik Systeme, Robert Bosch GmbH

TO: Richard van Iderstine -- Office of Rulemaking, NHTSA

TITLE: None

ATTACHMT: Attached to letter dated 5/29/92 from Paul J. Rice to Herr Spingler (A39; Std. 108)

TEXT:

For a new Porsche-car, we have decided to develop a headlamp as shown in the attached drawing. The lowbeam will be provided by an ellipsoid, the highbeam by a parabola. When highbeam is on, both bulbs will be on simultaneonsly.

My question is:

Will this headlamp meet the FMVSS-108-requirements concerning the location on a car?

Thanks in advance for a quick answer.

ID: nht93-2.14

Open

DATE: March 11, 1993

FROM: Samuel Kimmelman

TO: Chief Counsel, NHTSA

TITLE: None

ATTACHMT: Attached to letter dated 3-31-93 from John Womack to Samuel Kimmelman (A41; Std. 108); Also attached to letter dated 11-1-89 from Stephen P. Wood to Samuel Kimmelman

TEXT: Enclosed is a copy of a letter dated Nov. 1, 1989 from NHTSA, signed by the then Acting Chief Counsel Stephen P. Wood.

In the next to last paragraph Mr. Wood states that NHTSA requires the front hazard waning lamps must continue to operate even when the stop lamps are activated.

Does NHTSA continue to hold to the requirement as put forth in Mr. Wood's letter or has this requirement been revised?

ID: aiam1558

Open
Mr. Steve A. Spretnjak, Excel Industries, 1003 Industrial Parkway, Elkhart, IN 46514; Mr. Steve A. Spretnjak
Excel Industries
1003 Industrial Parkway
Elkhart
IN 46514;

Dear Mr. Spretnjak: This is in reply to your letter of June 28, 1974, requesting the statu of a proposed amendment published January 9, 1971 (36 F.R. 327), to Motor Vehicle Safety Standard No. 205, 'Glazing Materials,' that would have required markings specified for windshields to appear in each windshield's lower left-hand corner.; This proposed requirement was not adopted. Other requirements propose by this notice, however, were adopted by a subsequent notice published June 21, 1972 (37 F.R. 12237), which amended Standard No. 205. The preamble of this notice referred to the agency's action on the proposed requirements for marking location. A further notice was issued on November 11, 1972 (37 F.R. 24035), which responded to petitions for reconsideration of the amendments of June 21, 1972. Copies of the notices of June 21 and November 11, 1972, are enclosed.; There are presently no requirements regarding the location of marking for motor vehicle glazing materials.; Yours truly, Richard B. Dyson, Acting Chief Counsel

ID: nht91-5.20

Open

DATE: August 9, 1991

FROM: David L. Kulp -- Manager, Fuel Economy Planning & Compliance, Environmental and Safety Engineering Staff, Ford Motor Company

TO: Orron E. Kee -- NHTSA

TITLE: Reference: Deletion of Off-Highway Data from the Pre-Model and Mid-Model Reports

ATTACHMT: Attached to letter dated 10-23-91 from Paul Jackson Rice to David L. Kulp (A38; Part 523; Part 537)

TEXT:

Ford requests your concurrence to discontinue the reporting of off-highway data as listed in S537.7(c)(5) for light-duty trucks that otherwise comply to the light-duty truck definition in S523.5(a). Per a telephone conversation between you and Ms. Peg Gutmann of my staff on July 19, 1991, the off-highway data is only required for automobiles that a manufacturer wishes to classify as a light-duty truck per the provisions of S523.5(b).

Please contact Ms. Gutmann at (313) 337-5367 if you have any questions or concerns.

ID: aiam0113

Open
Mr. Warren M. Heath, Commander, Engineering Section, Department of California Highway Patrol, P.O. Box 898, Sacramento, CA 95804; Mr. Warren M. Heath
Commander
Engineering Section
Department of California Highway Patrol
P.O. Box 898
Sacramento
CA 95804;

Dear Mr. Heath: Your letter of August 19, 1968, addressed to Mr. David A. Fay, of th National Highway Safety Bureau has been forwarded to my office for reply.; The original list of definitions of vehicles was published in th Federal Register as part of a Notice of Proposed Rule Making dated December 3, 1966. Comments were requested from interested parties. Subsequently, the definition of a multipurpose vehicle was added to the Federal Motor Vehicle Safety Standards in response to a number of comments received from industry requesting a different category for certain utility vehicles. Under the previous classification, there were a number of special purpose vehicles which did not fit into any single category. It was agreed that certain types of motor vehicles, such as Dune Buggies, the Carryall, Travelall, Compact Van, Jeep Wagoneer, Ford Bronco, and Scout type vehicles comprised a hybid (sic) class of motor vehicle which possessed the characteristics of more than one of the motor vehicle categories previously established. The 'special features' include such items as 4-wheel drive amphibious equipment. Due to the differences in body construction, load time requirements, and general vehicle purpose, it was not considered reasonable to require those dual purpose vehicles designed to carry ten persons or less to meet all of the passenger car requirements, as would have been required by the Notice. For those reasons, the new category of 'multipurpose passenger vehicle' use (sic) added to Section 245(b).; Your interest in the automotive safety program of the Federal Highwa Administration is greatly appreciated.; Sincerely, Eugene B. Laskin, Acting Director, Office of Standard Preparation, Motor Vehicle Safety Performance Service;

ID: aiam3284

Open
Charles M. Kneip, Vehicle Services Division, Department of Motor Vehicles, Lincoln, NE 68509; Charles M. Kneip
Vehicle Services Division
Department of Motor Vehicles
Lincoln
NE 68509;

Dear Mr. Kneip: This is in response to your letter of May 7, 1980, in which you aske whether the proposed Nebraska certificate of title may be used as a substitute for the Federal odometer disclosure form required by 49 CFR Part 580.; The Nebraska title differs from the minimum Federal requirements i that there is no certification that the odometer reading reflects the actual mileage or the mileage over 99,999 miles, or is not the actual mileage. The buyer is not required to sign the Nebraska title as he is the Federal form (sic). In addition, your title does not refer to the legal consequences of a false disclosure. If you can make these additions, the Nebraska title will satisfy the Federal requirements.; For your information, I have enclosed a copy of the *Federal Register notice which discusses the short form odometer disclosure that States may use on their titles to satisfy Federal requirements, a letter to Maryland in which we indicate that formal approval by NHTSA is not necessary if the title contains the specified information, and sample titles that the NHTSA has approved.; If you need any further inforamtion, please do not hesitate to contac us.; Sincerely, John Womack, Assistant Chief Counsel

ID: aiam1415

Open
Mr. G. M. Hespeler, Manager, Safety Engineering, Mercedes-Benz of North America, Inc., One Mercedes Drive, Montvale, NJ 07645; Mr. G. M. Hespeler
Manager
Safety Engineering
Mercedes-Benz of North America
Inc.
One Mercedes Drive
Montvale
NJ 07645;

Dear Mr. Hespeler:#This is in reply to your letter of January 21, 1974 which requested interpretation of Federal Motor Vehicle Safety Standard No. 104, 'Windshield Wiping and Washing Systems.'#The wiped area as stated in S4.1.2, is to be evaluated as a percentage of areas A, B, and C 'of the windshield.' This means that areas A, B, and C are evaluated in 'unwrapped view,' rather than in the form of a projection of the windshield's surface.#Sincerely, E.T. Driver, Director, Office of Operating Systems, Motor Vehicle Programs;

ID: aiam3767

Open
Mr. Lee Jay Mandell, President, LJM Associates, Inc., 22030 Lanark Street, Canoga Park, CA 91034; Mr. Lee Jay Mandell
President
LJM Associates
Inc.
22030 Lanark Street
Canoga Park
CA 91034;

Dear Mr. Mandell: This is in response to your letter of October 19, 1983, discussing lighting product that you have developed and asking for 'the approval of the DOT or at least to insure that no active disapproval would be forthcoming.'; Your device utilizes the body panel between the left and right rea lights to emphasize braking, right and left turns, hazard flashing, and backing up. Roughly, your device operates by lights spreading from the center of the panel outward, in either or both directions.; We think that there is great potential for confusion that this devic could create since it is so unlike anything seen before on a motor vehicle. In the stopping mode the driver following will see the steady light of the stop lamp at the edge of the vehicle, but also the dynamic lights of your device spreading out from the center. The same dynamic light spread is seen but is meant to indicate something entirely different when both turn signal lamps are operating simultaneously in the hazard warning mode. Thus, the potential for impairment of the required lighting equipment exists.; Generally, we do not favor any lights on the rear of a vehicle that ar not required by the Federal lighting standard.; Sincerely, Frank Berndt, Chief Counsel

ID: aiam0260

Open
Mr. Louis C. Lundstrom, Director, Automotive Safety Engineering, General Motors Engineering Staff, General Motors Technical Center, Warren, MI 48090; Mr. Louis C. Lundstrom
Director
Automotive Safety Engineering
General Motors Engineering Staff
General Motors Technical Center
Warren
MI 48090;

Dear Mr. Lundstrom: This is in reply to your letter to Mr. Toms of October 15, 1970, i which you asked whether General Motors could provide one consumer information document to fleet purchasers of motor vehicles, rather than putting a booklet in each car as is done in the usual case.; The answer is yes. 49 CFR 575.6(a) requires that the information b provided 'to that purchaser', 'at the time a motor vehicle is delivered' to him. It does not require that the information be in the vehicle, or that there be one booklet per vehicle.; We are pleased to be of assistance. Sincerely, Rodolfo A. Diaz, Acting Associate Director, Motor Vehicl Programs;

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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