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: 9556Open Mr. Adam A. Freund Dear Mr. Freund: This responds to your letter addressed to the attention of Walter Myers of my staff in which you asked whether Table II of Federal Motor Vehicle Safety Standard (FMVSS) No. 119, New pneumatic tires for vehicles other than passenger cars, contains certain errors. You pointed out in your letter that Table I of FMVSS 119 specifies a plunger diameter of 5/16 inch for motorcycles, and 3/4 inch for 12-inch or smaller rims other than motorcycles. Table II, on the other hand, leaves blank the plunger diameter space in the motorcycle column, but lists 5/16 inch plunger diameter in the 12-inch or smaller rim column. You indicated your belief that the inconsistency is due to a typographical error in those columns of Table II and asked us to confirm your interpretation. Your observation is correct. A November 13, 1973 rule adopting Tables I and II (38 FR 31299) (copy enclosed) specifies the 5/16-inch diameter plunger for motorcycle tires, and the 3/4- inch diameter plunger for 12-inch or smaller tires and 17.5- inch or smaller light truck tubeless tires. Accordingly, the plunger diameter for the motorcycle column in Table II should read 5/16. Similarly, the 12-inch or smaller column in the current Table II is in error in specifying a plunger diameter of 5/16 inch. The correct plunger diameter for that column in Table II should be 3/4 inch to correspond with the plunger diameter specified for 12-inch or smaller rims in Table I. Thank you for bringing this error to our attention. The agency will issue a correction to avoid any further confusion. Sincerely,
John Womack Acting Chief Counsel ref:119 d:4/12/94 |
1994 |
ID: nht94-6.37OpenDATE: April 12, 1994 FROM: John Womack -- Acting Chief Counsel, NHTSA TO: Adam A. Freund -- Manager, Testing Services, Standards Testing Laboratories, Inc. (Massillon, OH) TITLE: None ATTACHMT: Attached to letter dated 1/10/94 from Adam A. Freund to Walter Myers (OCC 9556) TEXT: This responds to your letter addressed to the attention of Walter Myers of my staff in which you asked whether Table II of Federal Motor Vehicle Safety Standard (FMVSS) No. 119, New pneumatic tires for vehicles other than passenger cars, contains certain errors. You pointed out in your letter that Table I of FMVSS 119 specifies a plunger diameter of 5/16 inch for motorcycles, and 3/4 inch for 12-inch or smaller rims other than motorcycles. Table II, on the other hand, leaves blank the plunger diameter space, in the motorcycle column, but lists 5/16 inch plunger diameter in the 12-inch or smaller rim column. You indicated your belief that the inconsistency is due to a typographical error in those columns of Table II and asked us to confirm your interpretation. Your observation is correct. A November 13, 1973 rule adopting Tables I and II (38 FR 31299) (copy enclosed) specifies the 5/16-inch diameter plunger for motorcycle tires, and the 3/4-inch diameter plunger for 12-inch or smaller tires and 17.5- inch or smaller light truck tubeless tires. Accordingly, the plunger diameter for the motorcycle column in Table II should read 5/16. Similarly, the 12-inch or smaller column in the current Table II is in error in specifying a plunger diameter of 5/16 inch. The correct plunger diameter for that column in Table II should be 3/4 inch to correspond with the plunger diameter specified for 12-inch or smaller rims in Table I. Thank you for bringing this error to our attention. The agency will issue a correction to avoid any further confusion. |
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ID: 1983-1.24OpenTYPE: INTERPRETATION-NHTSA DATE: 03/11/83 FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA TO: J.V.R. Enterprises -- Robert A. Wirffel TITLE: FMVSS INTERPRETATION TEXT:
Mr. Robert A. Wirffel J.V.R. Enterprises 8511 No. Canterbury Avenue Sun Valley, California 91352 Dear Mr. Wirffel: This in reply to your letter of February 6, 1983, to Mr. Vinson of my staff regarding the legality under Federal Motor Vehicle Safety Standard No. 108 of your "Safe-T-Signal" directional indicator. The signal, and 8-inch amber arrow, is located under the right side of a semi-trailer, approximately at mid point, and is intended to warn vehicles in the adjacent right traffic lane that the semi-trailer makes wide right turns. The system supplements the trailer's existing turn signal, as we understand it. There is nothing in Standard No. 109 that prohibits use of your system as it does not appear to impair the effectiveness of the lighting equipment, such as turn signals, required by Standard No. 108 as original equipment. However, you must insure that it is permitted in States in which the device is likely to be used. We note the statement in your letter that the amber arrow is "D.O.T. approved" and in your descriptive sheet as well, plus the statement that is "conforms to applicable federal motor vehicle standards (C.H.P approved) ." This is legally incorrect, as the U.S. Department of Transportation does not "approve" lighting equipment , nor does Standard No. 108 specify requirements with which a supplementary turn signal system must conform. If you wish to assure prospective purchasers that Federal requirements as "Permissible under Federal Motor Vehicle Safety Standard NO., 108." Sincerely,
Frank Berndt Chief Counsel |
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ID: 2643oOpen Mr. Billy S. Peterson Dear Mr. Peterson: This is in reply to your letter of September 23, 1987, with respect to positioning of rear mounted lamps and reflectors in accordance with Federal Motor Vehicle Safety Standard No. l08. Your client has designed a vehicle in which the backup lamps and rear reflex reflectors would be mounted on the deck lid, and you have asked whether there are any current or contemplated prohibitions that would preclude this design. The lamps in question will be mounted on a rigid part of the vehicle as required by paragraph S4.3.1 of Standard No. l08, and the deck lid will be closed and the lamps and reflectors in full view under normal operating conditions. The visibility requirements of lamps and reflectors in Standard No. l08 are predicated on the normal driving or closed deck lid position. Since the use of motor vehicles, including driving with deck lids open or otherwise having the lamps and reflectors obscured by a particular load on the vehicle is under the jurisdiction of the individual States, we do not anticipate rulemaking on this subject. Thus this design is not prohibited by Standard No. l08. Sincerely,
Erika Z. Jones Chief Counsel ref:l08 d:1/28/88 |
1988 |
ID: aiam2478OpenMr. Joseph E. Papelian, Department of Police, Detroit, MI 48226; Mr. Joseph E. Papelian Department of Police Detroit MI 48226; Dear Mr. Papelian: This is in response to your letter of November 9, 1976, asking whethe Federal regulations permit manufacturers to equip police vehicles with 'push bumpers' and with bullet-proof shields located between the front and rear seating compartments.; Standard No. 215, *Exterior Protection*, establishes requirements fo the impact resistance and the configuration of front and rear vehicle surfaces of passenger cars. This standard does not prohibit 'push bumpers' and manufacturers are free to equip passenger cars with any bumper design they choose as long as the requirements of Standard No. 215 are met.; Standard No. 205, *Glazing Materials*, specifies requirements fo glazing for use in motor vehicles, including the permissible locations for the various types of glazing. The standard permits bullet-resistant glazing to be used anywhere in a motor vehicle, provided such glazing meets specified performance requirements. Therefore, vehicle manufacturers are permitted to equip vehicles with the bullet-proof shields mentioned in your letter if such shields are constructed with glazing that conforms to the requirements in Standard No. 205.; You also asked whether the police department or a business coul install the equipment in question. If the equipment is installed after the first sale of the vehicle for purposes other than resale, the Federal safety standards would no longer be applicable under the National Traffic and Motor Vehicle Safety Act (15 U.S.C. S 1397(b)(1). However, S 108(a)(2)(A) prohibits, with one exception, manufacturers, distributors, dealers, and motor vehicle repair businesses from knowingly rendering inoperative a safety device or element of design that has been installed in compliance with a motor vehicle safety standard.; Therefore, whether or not a business could install the equipmen depends on the nature of the business. If the business is a 'motor vehicle repair business', it can only install the 'push bumpers' and shields if such installation does not knowingly render inoperative devices or elements of design installed in the vehicle in compliance with applicable safety standards. Section 108(a)(2)(A) defines 'motor vehicle repair business' as any person who holds himself out to the public as in the business of repairing motor vehicles or motor vehicle equipment for compensation.; I have enclosed copies of Standard No. 205 and Standard No. 215. I hav underscored the pertinent sections of Standard No. 205 (and the ANS Z26 standard incorporated by reference in Standard No. 205) for your information.; Sincerely, Frank A. Berndt, Acting Chief Counsel |
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ID: aiam2477OpenMr. Joseph E. Papelian, Department of Police, Detroit, MI 48226; Mr. Joseph E. Papelian Department of Police Detroit MI 48226; Dear Mr. Papelian: This is in response to your letter of November 9, 1976, asking whethe Federal regulations permit manufacturers to equip police vehicles with 'push bumpers' and with bullet-proof shields located between the front and rear seating compartments.; Standard No. 215, *Exterior Protection*, establishes requirements fo the impact resistance and the configuration of front and rear vehicle surfaces of passenger cars. This standard does not prohibit 'push bumpers' and manufacturers are free to equip passenger cars with any bumper design they choose as long as the requirements of Standard No. 215 are met.; Standard No. 205, *Glazing Materials*, specifies requirements fo glazing for use in motor vehicles, including the permissible locations for the various types of glazing. The standard permits bullet-resistant glazing to be used anywhere in a motor vehicle, provided such glazing meets specified performance requirements. Therefore, vehicle manufacturers are permitted to equip vehicles with the bullet-proof shields mentioned in your letter if such shields are constructed with glazing that conforms to the requirements in Standard No. 205.; You also asked whether the police department or a business coul install the equipment in question. If the equipment is installed after the first sale of the vehicle for purposes other than resale, the Federal safety standards would no longer be applicable under the National Traffic and Motor Vehicle Safety Act (15 U.S.C. S 1397(b)(1). However, S 108(a)(2)(A) prohibits, with one exception, manufacturers, distributors, dealers, and motor vehicle repair businesses from knowingly rendering inoperative a safety device or element of design that has been installed in compliance with a motor vehicle safety standard.; Therefore, whether or not a business could install the equipmen depends on the nature of the business. If the business is a 'motor vehicle repair business', it can only install the 'push bumpers' and shields if such installation does not knowingly render inoperative devices or elements of design installed in the vehicle in compliance with applicable safety standards. Section 108(a)(2)(A) defines 'motor vehicle repair business' as any person who holds himself out to the public as in the business of repairing motor vehicles or motor vehicle equipment for compensation.; I have enclosed copies of Standard No. 205 and Standard No. 215. I hav underscored the pertinent sections of Standard No. 205 (and the ANS Z26 standard incorporated by reference in Standard No. 205) for your information.; Sincerely, Frank A. Berndt, Acting Chief Counsel |
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ID: nht78-4.18OpenDATE: 03/20/78 FROM: AUTHOR UNAVAILABLE; J. J. Levin, Jr.; NHTSA TO: Nebraska Dept. of Motor Vehicles COPYEE: R. TILTON; ARMSTRONG; HITCHCOCK TITLE: FMVSS INTERPRETATION TEXT: This responds to your January 16, 1978, letter asking several questions about the applicability of the school bus regulations to school buses manufactured after April 1, 1977, transporting 10 or more students to or from school or related events. You first ask whether these buses must be painted yellow and have school bus lighting and markings. The answer to your question is yes. Any vehicle that transports 10 or more students to or from school or related events is a school bus and must have the painting, marking, and lighting of a school bus. Your second question is whether smaller school buses (vans) are permitted to have van-type seats or must comply with the requirements of Standard No. 222, School Bus Passenger Seating and Crash Protection. A vehicle that transports 10 or more students must comply with all of the Federal school bus regulations, including the seating standard. |
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ID: nht74-1.38OpenDATE: 01/03/74 FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA TO: Truck-Lite Company TITLE: FMVSS INTERPRETATION TEXT: This is in reply to your letter of December 20, 1973, concerning the placement of rear identification lamps on the header of Fruehauf trailers. I enclose a copy of a recent exchange of correspondence between Fruehauf and this agency on this question which I believe is in point. It is our view that if a lamp is available which may be installed in a narrow header area, the upper location is "practicable" even though the lamps may not be the one specified by the vehicle's purchaser. Yours truly, ATTACH. December 20, 1973 Larry Schneider -- Chief Counsel, National Highway Traffic Safety Administration Subject: Placement of Rear Identification Lights Dear Mr. Schneider: We have a customer at the present time who finds it impractical to mount the three rear red identification light at the high level. Due to the special high door construction on the dry van, the upper door header does not lend itself to the installation of the standard lights that are now used on his equipment. These trailers are being manufactured by Fruehauf Corporation, and the present quantity is 400 trailers. In consideration of the large number of containers that are now on the highways with no upper lights and the hardship involved in endeavoring to place improvised lights at this level, we are requesting an opinion from your office as a guide for our future action. Thank you very much for your consideration. Yours very truly, TRUCK-LITE COMPANY; H. A. Sage, Director -- Research Development Enclosure CC: R. V. Tarr; J. J. Vicario |
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ID: nht92-7.21OpenDATE: April 30, 1992 FROM: Timothy C. Murphy -- Chairman, TSEI Engineering Committee (Lights), Transportation Safety Equipment Institute TO: Paul Jackson Rice -- Chief Counsel, NHTSA TITLE: Re: Request for Interpretation ATTACHMT: Attached to letter dated 5/27/92 from Paul J. Rice to Timothy C. Murphy (A39; Std. 108) TEXT: In adopting the definition of "effective projected luminous lens area," NHTSA declined to adopt the SAE language dealing with lens parts, "even if they do not contribute significantly to the total light output." The agency went on to state, "(t)o be fully effective the lamp must project light in an appropriate manner. (Federal Register, p. 50182-4 Vol. 55, No. 234/Dec. 5, 1990). On behalf of the Transportation Safety Equipment Institute (TSEI)* I would like to obtain an interpretation whether the lens leg of various lamp assemblies may be included in the calculation of 75 square centimeters or 11.625 square inches. Figure 1 attached graphically shows that the last optic against the lens leg projects light outward beyond the lens leg and yet the light may be beneficial to meeting the twenty degree outward test points for stop, tail, turn lamps. Therefore I would conclude that this light, although low in intensity due to its distance from the filament, may be significant as far as meeting the photometric requirements of the lamp. I request a ruling from NHTSA on how the agency would interpret the use of lens rims or legs to fulfill the 75 square centimeters requirements. * TSEI is a non-profit trade association, representing North American manufacturers of vehicle safety equipment, including headlighting and signal lighting products, rearview mirrors, reflex reflectors, emergency lighting and other safety equipment for emergency, service and related vehicles and emergency warning triangles. Attachment Figure 1 omitted. |
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ID: kroger.ztvOpenMr. Richard C. Kroger Dear Mr. Kroger: This is in reply to your letter of April 15, 2003, addressed to David "Comen" (Coleman), which we received on May 5. You seek clarification as to whether you are subject to the TREAD Acts early warning reporting (EWR) requirements set out in Subpart C of 49 CFR Part 579. Your company manufactures trucks exclusively for the United States Army. You asserted that feedback reports you receive from the Army on your trucks are usually "purposely vague and prevent any meaningful review or truck evaluation." In the event that negative information might be received regarding a trucks performance, you pointed out that furnishing us with this information could result in an enemy gaining knowledge that it could put to tactical use. You argued that "it would seem that the intent of the Act (protecting the consumer public at large) is inapplicable to our situation." The National Truck Equipment Association (NTEA) recently observed that under 49 CFR 571.7(c), vehicles manufactured for, and sold directly to, the military need not comply with the Federal motor vehicle safety standards. NTEA asked whether such vehicles should be counted as part of a manufacturers production and included in reporting of warranty claims, consumer complaints, field reports, etc. We replied on May 14, 2003, that:
By "some trucks," we mean trucks that are the counterparts of trucks that a manufacturer produces for non-military use. Thus, reports would not be required under the EWR rules for military personnel carriers. On the other hand, reports would be required for pickup trucks, vans, and sedans that have civilian counterparts. You have informed us that your company does not produce trucks for civilian applications. In other words, there are no civilian counterparts. Based on this information, we do not consider your company subject to the EWR requirements. If you have any questions, you may phone Taylor Vinson of this Office (202-366-5263). Sincerely, Jacqueline Glassman Ref:579 |
2003 |
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.