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
| Interpretations | Date |
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ID: nht91-4.19OpenDATE: June 12, 1991 FROM: Paul Jackson Rice -- Chief Counsel, NHTSA TO: Michael L. Harmon -- President, Classic Interiors TITLE: None ATTACHMT: Attached to letter dated 2-14-91 from Michael L. Harmon to Paul J. Rice (OCC 5721) TEXT: This responds to your letter asking whether Standard No. 213, Child Restraint Systems, permits the installation of a built-in child restraint system (i.e., a child restraint system that is an integral part of the vehicle) in a multipurpose passenger vehicle (MPV), and if so, what requirements apply. As discussed below, a child restraint system built into an MPV would fall within the definition of "child restraint system" in Standard No. 213 and would therefore have to comply with all the provisions of the standard that are generally applicable to child restraint systems. Since such a restraint would not be portable, it would not have to meet any requirement that is, by its own terms, or those of the compliance test procedure for that requirement, specifically applicable to "add-on child restraint systems" only. Since it would be built into an MPV instead of a passenger car, it would not have to meet any requirement that is, for the same reasons, specifically applicable to "built-in child restraint systems" only. The following sections of Standard No. 213 contain requirements that would apply to a child restraint built into an MPV: S5.2.1 (head support surface), S5.2.2 (torso impact protection), S5.2.4 (protrusion limitation), S5.4 (belts, buckles and webbing), and S5.7 (flammability). The principle requirements of the standard that would not apply are those in S5.1.1 relating to dynamic performance. In view of the importance of the dynamic performance requirements for ensuring the safety of child restraint systems, we intend to begin rulemaking to apply those requirements to all built-in systems, not just to those installed in passenger cars. In the meantime, we suggest that manufacturers of such systems for MPVs carefully consider whether the systems provide protection comparable to that provided by built-in child restraint systems in passenger cars.
You should also be aware that the National Traffic and Motor Vehicle Safety Act (15 U.S-C- 1381-1431) imposes responsibilities on manufacturers of motor vehicles and motor vehicle equipment regarding safety-related defects. Manufacturers are responsible for ensuring that the vehicles and equipment they manufacture are free from safety-related defects and can perform their intended function safely. If the manufacturer or the agency determines that a safety-related defect (or noncompliance with an FMVSS) exists, the manufacturer is obligated under S151 et seq. of the Act to notify purchasers of its product and remedy the problem without charge. Manufacturers who fail to provide notification of or remedy for a defect or noncompliance may be subject to a civil penalty of up to $1,000 per violation. LEGAL ANALYSIS Standard No. 213 applies to child restraint systems for use in motor vehicles and aircraft. See section S3. The term "child restraint system" is defined as "any device except Type I or Type II seat belts, designed for use in a motor vehicle or aircraft to restrain, seat, or position children who weigh 50 pounds or less." See section S4. A child restraint system that is an integral part of an MPV would come within this definition. Some of Standard No. 213's requirements apply generally to "child restraint systems," i.e., without regard to whether a child restraint system is built-in or add-on or whether, if it is built-in, it is installed in a car or other type of vehicle. Since a child restraint system which is an integral part of an MPV comes within the definition of "child restraint system," it is required to meet all such requirements unless excepted. The following sections of Standard 213 contain requirements which apply generally to "child restraint systems": S5.2.1 (head support surface), S5.2.2 (torso impact protection), S5.2.4 (protrusion limitation), S5.4 (belts, buckles and webbing), and S5.7 (flammability). In a number of instances, however, particularly with respect to dynamic performance, Standard No. 213 either specifies separate requirements for "add-on child restraint systems" and "built-in child restraint systems," or provides a test procedure for these two types of child restraint systems only. The standard defines "add-on child restraint system" without respect to the type of vehicle to which it might be added, i.e., as "any portable child restraint system." The term "built-in child restraint system" is defined more restrictively, as "any child restraint system which is an integral part of a passenger car." (Emphasis added.) A child restraint system which is an integral part of an MPV does not come within either of these definitions, since such a restraint is neither portable nor a part of a passenger car. Therefore, Standard No. 213's requirements for "add-on child restraint systems" and "built-in child restraint systems," do not apply to a child restraint system which is an integral part of an MPV. Similarly, those requirements for which the standard specifies a test procedure for "add-on child restraint systems" and "built-in child restraint systems" only do not apply to a child restraint system which is an integral part of an MPV. I hope this information is helpful. Please contact us if you have further questions. |
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ID: aiam2736OpenHoward Sturtz, M.D., 1479 Ygnacio Valley Road, Walnut Creek, California 94598; Howard Sturtz M.D. 1479 Ygnacio Valley Road Walnut Creek California 94598; Dear Dr. Sturtz: Mr. Ralph Nader forwarded to me your letter dated November 23, 1977 concerning your difficulty in determining whether your 1977 Ford Econoline van is equipped with an energy absorbing steering column.; Ford Econoline vans are equipped with conventional steering column that are not energy absorbing. Federal Motor Vehicle Safety Standards No. 203, *Steering Control Impact Protection*, and No. 204, *Steering Control Rearward Displacement*, are currently only applicable to passenger cars, so manufacturers are not required to have energy absorbing steering columns on van vehicles. Ford has not voluntarily equipped its vans with such steering systems.; The National Highway Traffic Safety Administration shares your concer in this subject. As a matter of fact, the agency has initiated high priority rulemaking proceedings to extend the applicability of Several passenger car standards, including Standards 203 and 204, to both vans and light trucks.; Please let me know if you would like further information on automotiv safety matters.; Sincerely, Howard J. Dugoff, Deputy Administrator |
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ID: aiam2599OpenMr. R.G. Wilkins, Product Safety & Reliability Analyst, Grove Manufacturing Company, Shady Grove, Pennsylvania 17256; Mr. R.G. Wilkins Product Safety & Reliability Analyst Grove Manufacturing Company Shady Grove Pennsylvania 17256; Dear mr. Wilkins: This responds to your February 17, 1977, letter, concerning Nationa Highway Traffic Safety Administration's (NHTSA) tire labeling requirements contained in Standard No. 120, *Tire Selection and Rims for Motor Vehicles Other Than Passenger Cars*. You address the situation in which it is not practicable to affix the information label to the door.; Location of vehicle certification labels and tire information labels i governed by Part 567.4(c). This section provides that the primary location of the required labels is either the hinge pillar, door-latch post, or door edge that meet the door-latch post, next to the drivers seating position, or if none of these locations is practicable, to the left side of the instrument panel. Further, if none of the above locations is practicable, you may request an alternate location from the agency. I am enclosing a copy of Part 567 explaining how to request an alternate location for the information label.; Sincerely, Joseph J. Levin, Jr., Chief Counsel |
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ID: aiam0040OpenMr. A. Nathan Darby, 810 Blanco Street, Austin, TX 76703; Mr. A. Nathan Darby 810 Blanco Street Austin TX 76703; Dear Mr. Darby:#Thank you for your letter of December 17, 1967, to th National Highway Safety Bureau, concerning the installation of dual controls on passenger cars.#The present Federal Motor Vehicle Safety Standards do not prohibit the installation of dual controls provided none of the requirements specified by the standards are eliminated or adversely affected by such installation. In other words, if a dealer or manufacturer modifies a conforming vehicle, then he assumes the responsibility for the vehicle's certification. We enclose a complete set of standards now in effect for your information.#In the event that dual steering controls and other controls are provided on driver training vehicles, the applicability of the appropriate standards is confined to the primary controls. For example, under Standard No. 101, the person seated behind the secondary steering control need not be able to reach all controls.#We trust this information will be of assistance to you in your desire to comply with existing safety standards.#Sincerely, Joseph R. O'Gorman, Acting Director, Office of Performance Analysis, Motor Vehicle Safety Performance Service; |
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ID: aiam2506OpenMr. Karl-Heinz Ziwica, Manager, Safety Engineering, BMW of North America, Inc., Montvale, New Jersey 07645; Mr. Karl-Heinz Ziwica Manager Safety Engineering BMW of North America Inc. Montvale New Jersey 07645; Dear Mr. Ziwica: This is in response to your January 17, 1977, letter concerning th requirements of Safety Standard No. 111, *Rearview Mirrors*, For passenger cars. You requested confirmation of your interpretation that the standard specifies no requirements for outside rearview mirrors on the passenger's side of the vehicle when the inside rearview mirror meets S5.1.1 of the standard.; Your interpretation is correct. If the inside rearview mirror of passenger car meets the specified performance requirements, the vehicle is not required to be equipped with an outside rearview mirror on the passenger's side. However, a manufacturer is free to equip its vehicles with outside right-hand mirrors, either plane or convex, if he choses(sic).; You should note that each passenger car whose inside rearview mirro does not meet the field of view performance requirements of Paragraph S5.1.1 must have an outside rearview mirror of unit magnification installed on the passenger's side of the vehicle.; Sincerely, Frank Berndt, Acting Chief Counsel |
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ID: aiam0596OpenMr. E. G. Allison, Purchasing Agent, Lempco Industries, Inc., Metals Division, S. Main Street, New Lexington, OH 43764; Mr. E. G. Allison Purchasing Agent Lempco Industries Inc. Metals Division S. Main Street New Lexington OH 43764; Dear Mr. Allison: This is in reply to your letter of January 18, 1972, on the subject o an automobile dealer's obligations regarding seatbelts in new cars.; Motor Vehicle Safety Standard No. 208 requires seatbelts to b installed at all seating positions. Under the requirements of the National Traffic and Motor Vehicle Safety Act, which we administer, it is a violation of the law to sell a vehicle that does not conform to an applicable standard. A dealer may not, therefore, sell an automobile that does not have the required number of seatbelts.; Although the act does not prevent the purchaser of a vehicle fro removing the belts, after he has completed the purchase, we strongly advise him to leave the belts in and to wear them. A dealer who removes the belts after he has sold the vehicle does not violate the law, but he does his customer a disservice.; Sincerely, Richard B. Dyson, Assistant Chief Counsel |
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ID: aiam2436OpenMr. Warren M. Heath, Commander, Engineering Section, Department of California Highway Patrol, P.O. Box 898, Sacramento, California 95804; Mr. Warren M. Heath Commander Engineering Section Department of California Highway Patrol P.O. Box 898 Sacramento California 95804; Dear Mr. Commander Heath: This responds to your September 16, 1976, question whether any Federa regulation required that the maximum load rating assigned to a passenger car tire be reduced by approximately 10 percent in calculating its maximum load rating for use on a multipurpose passenger vehicle (MPV), truck, or bus.; The answer to your question is yes. Standard No. 120, *Tire Selectio and Rims for Motor Vehicles Other than Passenger Cars*, became effective September 1, 1976, and provides for the reduced maximum load rating you describe. Section S5.1.2 of the standard provides in part that '[w]hen a tire listed in [the passenger car tire standard] is installed on a multipurpose passenger vehicle, truck, bus, or trailer, the tire's load rating shall be reduced by dividing by 1.10 before calculating the sum [that must at least equal the axle system's gross axle weight rating].' A copy of the standard, with subsequent amendments, is enclosed for your information.; Sincerely, Frank A. Berndt, Acting Chief Counsel |
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ID: aiam2603OpenMr. R. G. Wilkins, Product Safety & Reliability Analyst, Grove Manufacturing Company, Shady Grove, PA 17256; Mr. R. G. Wilkins Product Safety & Reliability Analyst Grove Manufacturing Company Shady Grove PA 17256; Dear Mr. Wilkins: This responds to your February 17, 1977, letter concerning Nationa Highway Traffic Safety Administration's (NHTSA) tire label requirements contained in Standard No. 120, *Tire Selection and Rims for Motor Vehicles Other Than Passenger Cars*. You address the situation in which it is not practicable to affix the information label to the door.; Location of vehicle certification labels and tire information labels i governed by Part 567.4(c). This section provides that the primary location of the required labels is either the hinge pillar, door-latch post, or door edge that meets the door-latch post, next to the drivers (sic) seating position, or if none of these locations is practicable, to the left side of the instrument panel. Further, if none of the above locations is practicable, you may request an alternate location from the agency. I am enclosing a copy of Part 567 explaining how to request an alternate location for the information label.; Sincerely, Joseph J. Levin, Jr., Chief Counsel |
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ID: aiam2635OpenMr. Paul F. Bennett, Chief Engineer, Utility Trailer, Manufacturing Co., P.O. Box 1299, City of Industry, CA 91744; Mr. Paul F. Bennett Chief Engineer Utility Trailer Manufacturing Co. P.O. Box 1299 City of Industry CA 91744; Dear Mr. Bennett: This responds to your May 20, 1977, letter asking whether your propose certification labels comply with the requirements of Part 567, *Certification*.; The National Highway Traffic Safety Administration (NHTSA) does no issue advance approvals of compliance with Federal safety standards or regulations. We will, however, issue an opinion of whether your labels appear to comply with the regulations. The labels you submitted appear to comply with all but one of the requirements of Part 567 and Standard No. 120, *Tire Selection and Rims for Motor Vehicles Other Than Passenger Cars*. On your certification labels, you listed the symbol 'W/' before the rim information. This symbol should be dropped from the label. Further the rim size designation should use the symbol 'x' between the diameter and width. Information supplied on a certification label must be provided in the form detailed in Part 567.; Sincerely, Joseph J. Levin, Jr., Chief Counsel |
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ID: aiam2604OpenMr. Byron A. Crampton, Manager of Engineering Services, Truck Body and equipment Association, Inc., 5530 Wisconsin Avenue, N.W., Washington, D.C. 20015; Mr. Byron A. Crampton Manager of Engineering Services Truck Body and equipment Association Inc. 5530 Wisconsin Avenue N.W. Washington D.C. 20015; Dear Mr. Crampton: This responds to your April 6, 1977, letter asking whether two propose labels satisfy the requirements for certification and information labels found in 49 CFR Part 567, *Certification*, and Standard No. 120, *Tire Selection and Rims for Motor Vehicles Other Than Passenger Cars*.; The National Highway Traffic Safety Administration (NHTSA) does no issue advance approval of compliance by manufacturers with motor vehicles safety standards or regulations. The agency, however, will give an informal opinion as to whether your sample labels appear to comply with NHTSA regulations. From the illustrations you present, it appears that you have closely followed the format suggested in our regulations, and therefore, the labels seem to comply with the agency's requirements. Section S5.3(b) of Standard No. 120 permits the use of both labels when affixed in accordance with Part 567.4(b)-(f).; Sincerely, Joseph J. Levin, Jr., 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.