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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 771 - 780 of 2066
Interpretations Date
 search results table

ID: nht91-3.32

Open

DATE: April 29, 1991

FROM: Paul Jackson Rice -- Chief Counsel, NHTSA

TO: Eric G. Hoffman -- Russell & Hoffman, Inc.

TITLE: None

ATTACHMT: Attached to letter dated 3-26-91 from Eric G. Hoffman to Harry Thompson (OCC 5892)

TEXT:

This responds to your letter of March 26, 1991, addressed to Mr. Harry Thompson, asking about a private school's use of "mini-vans which are designed to carry more than 10 passengers." Your letter was referred to our office for reply. You stated that the school has become aware of the National Traffic and Motor Vehicle Safety Act (Safety Act) and is concerned whether the operation of the vans is in compliance with applicable regulations under the Act. You asked a number of questions related to that concern.

I am pleased to have this opportunity to clarify the operation of Federal law as it applies to school buses. The National Highway Traffic Safety Administration (NHTSA) defines "school bus" as a motor vehicle designed for carrying 11 or more persons, including a driver, and sold for transporting students to and from school or school-related events. Therefore, the vehicles refered to in your letter would be considered school buses under federal law.

The National Highway Traffic Safety Administration (NHTSA) has issued Federal motor vehicle safety standards applicable to all new school buses. These standards impose obligations on the manufacturers and sellers of new motor vehicles, not upon the subsequent users of these vehicles. It is a violation of Federal law for any person to sell as a school bus any new vehicle that does not comply with all school bus safety standards. If your client believes that they have been sold noncomplying vehicles, and that the dealer knew of their intended use, the school should contact NHTSA's Office of Vehicle Safety Compliance, at the address given above, and inform them of the apparent violation of Federal law.

Without violating any provision of Federal law, a school may use a vehicle to transport school children, even if the vehicle does not comply with Federal school bus regulations. This is so because the individual States have authority over the activities of a user of a school bus. Since the various questions you ask assume that the Safety Act regulates users of school buses, we are unable to provide specific answers to those questions. To determine whether the private school your firm represents may use noncomplying vans, you must look to state law.

I must emphasize NHTSA's position that a vehicle meeting Federal school bus regulations is the safest way to transport students. I encourage the school your firm represents to give its most careful consideration to the possible consequences of transporting students in vehicles that do not comply with these regulations.

I hope you find this information helpful. If you have further questions, please contact Mary Versailles of my staff at this address or by telephone at (202) 366-2992.

ID: aiam3371

Open
Mr. Stephen E. Mulligan, International Harvester, 401 North Michigan Avenue, Chicago, IL 60611; Mr. Stephen E. Mulligan
International Harvester
401 North Michigan Avenue
Chicago
IL 60611;

Dear Mr. Mulligan: This is in response to your letter of October 1, 1980, in which you as whether compliance with 49 CFR 567, Certification, will satisfy the requirements of S4.3 of Federal Motor Vehicle Safety Standard No. 115, 49 CFR 571.115.; Section 4.3 of Federal Motor Vehicle Safety Standard No. 115 require that the vehicle identification number (VIN) 'appear clearly and indelibly upon either a part of the vehicle other than the glazing that is not designed to be removed except for repair or upon a separate plate or label which is permanently affixed to such a part.' S4.3.1 requires each character to appear in a capital, sans serif typeface. In the case of passenger cars and trucks of 10,000 pounds or less GVWR, each character must have a minimum height of 4 mm. S4.4 specifies that the VIN for passenger cars and trucks of 10,000 pounds or less GVWR shall be located within the passenger compartment.; Section 567.4 of Part 567, Certification (49 CFR 567), requires tha the certification label be permanently affixed to the vehicle, and display the vehicle identification number. Consequently, for all vehicles except passenger cars and trucks of 10,000 pounds or less GVWR, compliance with S 567.4 of Part 567 would also effect compliance with S4.3 of Standard No. 115 so long as capital, sans serif typeface was used.; Sincerely, Frank Berndt, Chief Counsel

ID: aiam0678

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

Dear Mr. Lundstrom: This is in reply to your letter of March 28, 1972, requestin elaboration of a statement made in the preamble to Motor Vehicle Safety Standard No. 125, Warning Devices. You asked that the NHTSA identify the specific data it used in determining that with respect to wide angle positioning of the device, a lower minimum candlepower than that required by the E.C.E. Provides adequate protection.; As I said in my letter to you of March 27, 1972, in response to similar request, a large amount of material has been placed in this public docket as background for the rulemaking action. All of this material has been carefully studied by the NHTSA, and together with the expertise and judgment of NHTSA personnel, relied on in reaching the decisions involved in issuing this standard. In informal rulemaking proceedings, the decisions are based on the total weight of the agency's knowledge, not on particular items of information.; I will comment, however, that some of the materials relating to th passage that you quoted were submittals from Chrysler Corporation (Nr. 147) and the California Highway Patrol (Nr. 143), and the University of California report on triangle reflector performance (General Reference Nr. 17, Attachment 2).; Sincerely yours, Robert L. Carter, Acting Associate Administrator Motor Vehicle Programs;

ID: aiam0938

Open
Mr. Bernard P. O'Meara, Center for Auto Safety, 800 National Press Building, Washington, DC 20004; Mr. Bernard P. O'Meara
Center for Auto Safety
800 National Press Building
Washington
DC 20004;

Dear Mr. O'Meara: Thank you for your letter of 29 November, 1972, concerning allege non-compliance of the Defect Information Report regarding Volkswagen Windshield Wipers, submitted by Volkswagen of America on October 12, 1972, with the requirements of NHTSA's Defect Reports Regulations, 49 CFR Part 573. We agree that Volkswagen has failed to supply information required by Sections 573.4(c)(2) and 573.4(c)(6) of the Regulation, specifically, the months of manufacture of the affected vehicles and a chronology which includes warranty claims, field service bulletins, and other such information. We are contacting Volkswagen to determine why the Company has failed to furnish that information and to attempt to obtain it. We also agree with your conclusion that 100% of 1948-1969 Volkswagens are potentially affected by the windshield wiper defect. However, Volkswagen's statement that 'no information is available' as to either the total number of such vehicles operating in the United States, or the percentage potentially affected satisfies the disclosure requirement of the regulation (49 CFR 573.4(c)(3, 4)).; We cannot agree, however, with your remaining assertions o non-compliance with the Regulations. While the Volkswagen Information Report is lacking in detail and is a poor example of an informational communication, it does contain minimal responses to the enumerated requirements of the Regulations.; Thank you for your interest in motor vehicle safety. Sincerely, Lawrence R. Schneider, Chief Counsel

ID: aiam1470

Open
Mr. William A. Goichman, Rozner and Yorty, Suite 1808, 10960 Wilshire Boulevard, Los Angeles, CA 90024; Mr. William A. Goichman
Rozner and Yorty
Suite 1808
10960 Wilshire Boulevard
Los Angeles
CA 90024;

Dear Mr. Goichman: This responds to your March 26, 1974, request for information on sea belt regulations as they concern reclining passenger seats.; Federal Motor Vehicle Safety Standard No. 208, *Occupant Cras Protection,* requires passenger cars to be equipped with seat belt assemblies, but it does not contain performance requirements to regulate the effectiveness of the belt assembly with the seating system in the reclining position.; Federal Motor Vehicle Safety Standard No. 207, *Seating Systems* specifies minimum safety requirements for motor vehicle seats. The requirements of the standard are based on conventional seat designs that normally incorporate a seat back angle of approximately 25 degrees rearward inclination from the vertical. Standard No. 207 requires that reclining seats be tested in their most upright position and does not require seats to be tested in the reclining position.; The National Traffic and Motor Vehicle Safety Act of 1966 preempt state motor vehicle safety regulations which are not identical to the Federal standards with regard to the same aspect of performance and therefore any state law would be identical to Standards Nos. 207 and 208 on these aspects of performance (15 U.S.C. S 1392 (d)).; The engineering staff is not aware of any studies in the area of sea belts and reclining seats.; Yours truly, Richard B. Dyson, Assistant Chief Counsel

ID: aiam2866

Open
Mr. Robert B. Kurre, Director of Engineering, Wayne Corporation, P. O. Box 1447, Industries Road, Richmond, IN 47374; Mr. Robert B. Kurre
Director of Engineering
Wayne Corporation
P. O. Box 1447
Industries Road
Richmond
IN 47374;

Dear Mr. Kurre: This responds to your recent letter asking whether Safety Standard No 208, *Occupant Crash Protection*, does require side- facing seats in multipurpose passenger vehicles to comply with one of the options under paragraph S4.2.2, since the side-facing seats in question would be considered designated seating positions. If a manufacturer chooses to install seat belts under one of the options of that paragraph, the seat belt assemblies must comply with Safety Standard No. 209, *Seat Belt Assemblies*, and Safety Standard No. 210, *Seat Belt Anchorages*.; Safety Standard No. 210 does exempt side-facing seats from its strengt requirements, but all other requirements of the standard would be applicable. However, we strongly recommend that belt anchorages for side-facing seats be of at least equivalent strength to anchorages for forward and rearward facing seats, since the strength specifications are only minimum performance requirements. Side-facing seats were excepted from the strength requirements specified in the standard because the forces acting on side-facing seats are different from those acting on forward or rearward facing seats and the requirements and procedures were specifically developed for these latter seats.; Please contact this office if you have any further questions. Sincerely, Joseph J. Levin, Jr., Chief Counsel

ID: aiam2225

Open
Mr. Clarence J. Baudhuin, 24040 Killion Street, Woodland Hills, CA 91364; Mr. Clarence J. Baudhuin
24040 Killion Street
Woodland Hills
CA 91364;

Dear Mr. Baudhuin: This is in response to your January 29, 1976, letter to Secretar Coleman, concerning problems with your 22 foot Executive 'MINI' Motorhome.; SS 567.4(g)93) and 567.5(a)(5) of 49 CFR Part 567, *Certification* provide that a motor vehicle's Gross Vehicle Weight Rating (GVWR) shall; >>>not be less than the sum of the unloaded vehicle weight, rated carg load, and 150 pounds times the vehicle's designated seating capacity.<<<; Your letter and its enclosures indicate that your vehicle's weight i 9180 pounds, its designated seating capacity is six, and the GVWR specified by Executive is 9000 pounds. From this information, there appears to be a violation by Executive of Part 567. In addition, the possibility that the rear axle may be overloaded under normal conditions of use may constitute a defect related to motor vehicle safety. I have forwarded your letter to our Office of Standards Enforcement for such further action as may be appropriate.; Please note that a final-stage manufacturer is not automaticall prohibited from certifying a GVWR that differs from that specified by the chassis manufacturer. For the purposes of the Federal motor vehicle safety standards and regulations, Executive is free to certify a lower GVWR, provided the above-cited constraint is observed.; The remaining questions presented in your letter are not matters ove which we have jurisdiction, and probably are most appropriately handled by a private attorney.; Sincerely, Frank A. Berndt, Acting Chief Counsel

ID: aiam1735

Open
Mr. Robert A. Danis, Carlton Manufacturing Company, 1152 High Street, Central Falls, Rhode Island 02863; Mr. Robert A. Danis
Carlton Manufacturing Company
1152 High Street
Central Falls
Rhode Island 02863;

Dear Mr. Danis: This is in response to your letter of October 23, 1974, requesting ou comments on your West Coast type mirror (which includes a ground-in convex spot mirror) and information on Federal regulations for spot mirrors in general.; Standard No. 111, *Rearview Mirrors*, provides minimum performanc requirements for rearview mirrors on passenger cars and multipurpose passenger vehicles. According to the standard, the outside rearview mirror required to be placed on the driver's side of the vehicle must be furnish the driver with a specified field of view to the rear of substantially unit magnification. As long as the mirror is capable of satisfying these field view requirements, the inclusion of a convex spot mirror no the plane mirror (as with the West Coast mirror) is not prohibited by the standard. If your West Coast type mirror is capable of providing the required view of substantially unit magnification independent of its convex spot mirror, it will comply with the standard.; The recent notice proposing to amend the rearview mirror standard (Ma 1, 1974, 39 FR 15143), does not alter the above described permissible use of West Coast type mirrors. No requirements for spot mirrors are contained in the Federal motor vehicle safety standards.; We appreciate your interest. Yours truly, Richard B. Dyson, Acting Chief Counsel

ID: aiam1580

Open
Mr. Raymond E. Jones, Project Engineer, Dura Corporation, Fords Mill Road, Paris, KY 40361; Mr. Raymond E. Jones
Project Engineer
Dura Corporation
Fords Mill Road
Paris
KY 40361;

Dear Mr. Jones: This responds to Dura Corporation's July 24, 1974, questions whethe S5.6 of Standard No. 121, *Air brake systems*, requires parking brakes on air suspension liftable axles, and whether the 'no lockup' requirements of the standard apply to a liftable axle on a 'tandem axle rig'.; The parking brake performance options of S5.6 do not require parkin brakes on an air suspension liftable axle such as you describe. S5.6.2 requires only that the parking brakes installed on a vehicle meet minimum performance levels. S5.6.1 requires parking brake retardation force on 'an axle other than a steerable front axle'. We do not consider this requirement to apply to an axle which is not on the ground when the parking brake system is activated.; The standard's 'no lockup' requirement (S5.3.1) applies to >>>'any wheel at speeds above 10 mph except for . . . (b) Lockup of wheels on nonsteerable axles other than the two rearmos nonliftable, nonsteerable axles on a vehicle with more than two nonsteerable axles.<<<; Under this provision, if a vehicle has two nonliftable, nonsteerabl axles at the rear which do not lock up (such as an antilock-equipped tandem axle rig) it may be equipped with a liftable nonsteerable axle which does not meet the 'no lockup' requirements.; Yours truly, Richard B. Dyson, Acting Chief Counsel.

ID: aiam1744

Open
Mr. J. W. Kennebeck, Manager, Emissions, Safety & Development Dept., Volkswagen of America, Inc., Englewood Cliffs, NJ 07632; Mr. J. W. Kennebeck
Manager
Emissions
Safety & Development Dept.
Volkswagen of America
Inc.
Englewood Cliffs
NJ 07632;

Dear Mr. Kennebeck: This responds to Volkswagen's December 11, 1974, request fo confirmation that the deletion of the ignition interlock requirement from Standard No. 208, *Occupant crash protection*, does not have the effect of prohibiting installation of an interlock device in a vehicle which meets the requirements of S4.1.2.; Volkswagen will utilize a passive belt system in satisfaction of th requirements of S4.1.2. Passive belts are subject to specific belt assembly requirements of S4.5.3.3. These requirements were recently modified by deletion of the requirement for a belt interlock system (39 FR 38380, October 31, 1974), and passive belt assemblies must now conform to S7.1 (Adjustment), S7.2 (Latch mechanism), and S7.3 (Seat belt warning system).; Your interpretation of these requirements is correct. The Federal moto vehicle safety standards are minimum performance requirements with which each vehicle to which they are applicable must comply. They do not, however, prohibit installation of additional safety devices. As a practical matter, of course, additional devices could not be installed if that installation had the effect of causing the required systems not to comply.; The NHTSA agrees than (sic) an interlock system is important fo ensuring use of a passive belt system.; Yours truly, Richard B. Dyson, 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.