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: nht93-4.19OpenDATE: June 3, 1993 FROM: Kenneth G. Koop -- Risk Control Representative, Intergovernmental Risk Management Agency TO: John Wolmack (Womack) -- Acting Chief Counsel, National Highway Traffic Commission TITLE: Passenger Seat and Airbag Removal ATTACHMT: Attached to letter dated 8/26/93 from John Womack (signature by Kenneth N. Weinstein to Kenneth G. Koop (A41; Std. 207; Std. 208; VSA 108 (a)(2)(A)) TEXT: The Intergovernmental Risk Management Agency is a municipal risk pool serving 60 municipalities in Northeastern Illinois. Several of our member Police Chiefs have inquired as to whether there is a variance procedure that would permit their departments to legally remove the passenger seat and passenger airbag from their police vehicles, and place permanently mounted policing equipment in the seat's place. It is our position that since the passenger seat will be removed, therefore allowing no passenger in that area, the removal of the passenger side airbag should be permitted. We would greatly appreciate specific direction regarding these proposed modifications. |
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ID: nht93-4.2OpenDATE: May 18, 1993 FROM: Richard Muraski -- President/CEO, Equa-Brake TO: John Womack -- Acting Chief General Counsel, NHTSA COPYEE: Armando Mena TITLE: None ATTACHMT: Attached to letter dated 8/5/93 from John Womack (signature by Kenneth N. Weinstein) to Richard Muraski (A41; Std. 121) TEXT: On July 2, 1992, the National Highway Traffic Safety Administration (NHTSA) denied a Petition of Rulemaking on an Air Brake System product presented by the Washington Corporation. The petition would have amended FMVSS Standard No. 121 to require a device that regulates air pressure differential between the two wheels on each axle. This ruling could impact our product, the Equa-Brake System which operates on a similar principal yet different design. Equa-Brake is enclosing a packet on our product and would like an interpretation of this NHTSA action on it. This interpretation is vital to our efforts. Equa-Brake understands that this denial of rulemaking does not prohibit Equa-Brake from installing its product on vehicles through manufacturers dealer or repair businesses provided it does not render the brake system to fall out of compliance with Standard 121. If you have any questions, please contact me at 702-329-7072 or Armando Mena at 703-938-5117. Thank you. Attachment EQUA-BRAKE is a MECHANICAL "auxiliary brake system" that increases brake force and improves brake performance on all vehicles that are equipped with air brakes. Direct benefits of the Equa-Brake "auxiliary brake system" include safer, straighter, shorter (up to 30% shorter) stopping under panic braking situations. Reduced one wheel lock-up coupled with significantly reduced brake drum temperatures (reduced brake fade) allows drivers to maintain control under emergency stopping conditions, virtually eliminating potential jack-knife problems. Under normal braking - the increased brake force permits drivers to maintain their habitual braking patterns with substantially less application pressure. This reduces brake wear and also reduces the tendency for trailer wheels to lock-up - loaded or unloaded. Tire life is extended from 10% to 20% or more by reducing flat spots caused by one wheel lock-up. Additional direct benefits result in lower operating costs by extending brake component life up to 40% or more (some users claim extended brake life significantly exceeding 40%).
Indirect benefits derive from increased driver confidence in the vehicle being driven, along with potential insurance savings that result from a safer vehicle that could avoid costly accidents. Unlike drive line retarders that have proven to be dangerous when activated on wet road surfaces - especially in turns or cornering the driver is always in control of any vehicle equipped with the Equa-Brake "auxiliary brake system". The Equa-Brake "auxiliary brake system" is totally mechanical, does not use any type of electronics, does not require maintenance and is warranteed for five (5) years. It is absolutely fail safe. In the unlikely event any component of the Equa-Brake "auxiliary brake system" should fail, the vehicle brake system will return to factory specifications. Current users include fleets, concrete mixer trucks, fleets of trailers only and fire departments. Users report improved brake performance, extended brake component life and increased driver confidence in the ability to control their vehicle during the braking sequence. |
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ID: nht93-4.20OpenDATE: June 3, 1993 FROM: David L. Degenstein -- Manager, Product Safety & Compliance, Kenworth Truck Company TO: John Womack -- Acting Chief Counsel, NHTSA TITLE: None ATTACHMT: Attached to letter dated 9/7/93 from John Womack to David Degenstein (A41; Std. 101) TEXT: Kenworth Truck Company, a manufacturer of heavy duty Class 7 and 8 trucks and truck tractors, respectfully submits the following request for interpretation of Federal Motor Vehicle Safety Standard (FMVSS) No. 101, Controls and Displays. FMVSS 101 specifies requirements for the location, identification, and illumination of motor vehicle controls and displays. One of the vehicle controls regulated by this standard is the automatic vehicle speed system, or cruise control. Kenworth is in the process of developing a new product that will locate a cruise control switch in a console that is attached to the manual transmission shift lever, adjacent to the shift knob (see the attached photographs). One switch in the console will control the SET and RESUME functions of the cruise control, and the other switches will control the engine brake. The switches are operable by the driver, and the identification is visible to the driver in accordance with S5.1 of Standard No. 101; therefore, Kenworth believes this location to be in compliance. For your information, the switch which controls the ON and OFF function of the cruise control will remain located on the dash panel. Of course, while operating, the cruise control can be disengaged by depressing the brake, or clutch pedal. Illumination requirements for control identifications are specified in S5.3, and listed in Table 1(a), column 4, of Standard No. 101. Accordingly, Automatic - Vehicle Speed control (cruise control) is listed on Table 1(a) and accompanied by the word "yes" under column 4, indicating illumination is required whenever the headlights are activated. Exception to the illumination requirement is allowed provided the control is mounted to the floor, floor console, or steering column. Kenworth requests an interpretation regarding the applicability of the illumination requirement to a transmission shift lever mounted cruise control switch. Kenworth believes this cruise control switch location is similar, relative to driver's accessibility and visibility of the control, to an automobile switch located on a floor console, and therefore, illumination should not be necessary or required. Please confirm that our proposed location for a cruise control switch does not require illumination, and that the location complies with FMVSS No. 101. We look forward to hearing from you concerning our request. In the meantime, if you have any questions or need additional information, please do not hesitate to contact me.
(Attached photos and drawing omitted.) |
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ID: nht93-4.21OpenDATE: June 3, 1993 FROM: Richard Glover -- Director of New Product Development, Evenflo Juvenile Furniture Company, Inc. TO: Deirdre Fujita -- NHTSA TITLE: None ATTACHMT: Attached to letter dated 10/20/93 from John Womack to Richard Glover (A41; Std. 213) TEXT: I had attempted to call you concerning the possibility of including a bar code which could be automatically scanned at the bottom of the Car Seat Registration Card which consumers fill out. This bar code would contain model number, date of manufacturer, and serial number for the product that the card represents. We feel that by adding an automatically scanned bar code section to the card, that it will eliminate the possibility of mis- keying any of this information, in as much as the human element has been removed from the card. We would request a white section to be allowed in the portion of the card which is currently specified to be a 10 percent minimum gray scale background. I have sent you a mock up of the possible location that this bar code may reside in, for your consideration. We have noticed on the cards which are coming back to us at Evenflo so far, that if any postal damage has occurred to the card, that is very likely to occur on the bottom edge of the card. As a result of that, it may be more advantageous to move this white space into the area immediately below the area that the consumer fills in. It would be approximately the same width as the zone that the consumer fills in, and simply be a white space slightly further down into the card. It would leave the gray background around the outside perimeter of the card and would allow us space to openly print the model number, date of manufacture, and serial number in case there were any difficulties in bar code reading. I would appreciate your consideration of this matter. Please advise us, as we are near the point of having to print additional cards at this time, and release printing lots to our printing company are at a rate of 500,000 cards per lot. If this will require a petition for a change in the current rules, please advise me so that we may petition as soon as possible. I remain,
Attachment (Child Restraint Registration Card) omitted. |
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ID: nht93-4.22OpenDATE: June 4, 1993 FROM: John Womack -- Acting Chief Counsel, U.S. Department of Transportation, NHTSA TO: Daniel L. Kokal -- Champagne Imports TITLE: None ATTACHMT: Attached to letter dated 5-8-93 from Daniel L. Kokal to Johnathan Womack (OCC 8624) TEXT: This is in reply to your letter of May 8, 1993, requesting use of continuous surety bonding for importation of nonconforming vehicles under the Registered Importer program. As you have informed us, (c)urrently, single entry bonds are filed with each (nonconforming) vehicle at 150% of the vehicle's value . . . .", and that this is expensive for the importer of Canadian vehicles which "rarely, if ever, require safety modifications to meet U.S. standards." You propose a continuous bond which would cover more than one vehicle, with the same level of value. The example you give is that of a continuous bond of $150,000 which would cover 10 vehicles imported together, each with a value of $10,000 as determined by the U.S. Customs Service, rather than individual bonds for 10 vehicles of $10,000 value, each bond at $15,000. Your specific suggestion is for "the ability to import no more than 15 vehicles under a given continuous bond at 150% total vehicle value." We are unable to implement your suggestion at present. Under 49 CFR 591.8 (a), the safety compliance bond's coverage is restricted to "only one motor vehicle." Thus, rulemaking is required to amend paragraph 591.8 (a) to permit a bond that covers more than one vehicle. In addition, Appendix A to Part 591 will have to be modified; this sets forth the terms of the bond, presently expressed in single-entry terms. As NHTSA is required to reimburse Customs for its costs in processing safety compliance bonds, that agency must necessarily be consulted to determine the impact of such a change on its operations, with a possible change in the bond processing fee imposed under Part 594. However, the Office of Vehicle Safety Compliance will consider the feasibility of rulemaking on this subject. |
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ID: nht93-4.23OpenDATE: June 4, 1993 FROM: Margaret W. Mouzon -- Mouzon Information Services TO: Mary Versailles -- Office of the General Counsel, NHTSA TITLE: None ATTACHMT: Attached to letter dated 7/21/93 from John Womack to Margaret W. Mouzon (A41; Std. 208; VSA 108(b)(1)), letter dated 3/4/93 from John Womack to Robert A. Ernst, and letter dated 1/19/90 from Stephen P. Wood to Linda L. Conrad (Std. 208) TEXT: Could you please describe and provide and interpretation of any federal regulations regarding dealer responsibility for occupant restraint system installations? For example, if a new or used car dealer sells a used car with an occupant restraint system which has been rendered inoperable, for example, a deployed airbag, does the dealer have to restore the restraint system to its original condition before delivering the vehicle to the purchaser? What if the dealer is selling the showroom model or demonstration model of an otherwise "new" vehicle, does the occupant restraint system have to be operable? I would much appreciate a response to these questions. Thank you very much for your assistance. |
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ID: nht93-4.24OpenDATE: June 4, 1993 FROM: James G. O'Neill TO: D. Fujida -- Office of Chief Counsel, NHTSA TITLE: None ATTACHMT: Attached to letter dated 8/5/93 from John Womack (signature by Kenneth N. Weinstein) to James G. O'Neill (A41; Std. 213) TEXT: I was directed to your office by Mr. Dick Jasinski of the equipment branch of safety compliance. I am manufacturing a product that will be attached to a child's car seat. I would like to know if there are any N.H.T.S.A. requirements the product must meet. The sketch will give you an idea of its function.
Attachment Sketch omitted. |
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ID: nht93-4.25OpenDATE: June 7, 1993 FROM: Ben F. Barrett -- Associate Director, The Legislative Research Department, State of Kansas TO: Office of Chief Counsel -- NHTSA TITLE: None ATTACHMT: Attached to letter dated 7/1/93 from John Womack to Ben F. Barrett (A41; Part 571.3) TEXT: A Kansas school district recently has expressed its desire to use a 15-passenger vehicle, which I believe generally is categorized as a "bus," to transport students to and from school or to and from school-related activities. But, the district does not want to cause these vehicles to meet the additional safety requirements of a "school bus." However, it is my understanding that if such a vehicle is used to transport students, it is under the federal law of a "school bus." Our state law, among other things, defines a "school bus" as a motor vehicle designed for transporting more than ten passengers in addition to the driver. The suggestion is that the state law be amended so as to exclude the 15-passenger vehicles from the state's "school bus" definition. No doubt, proposals of this type previously have been called to your attention. It would be helpful to us to obtain your comments concerning the consequences of such legislation, both with respect to any federal sanctions that might relate to this type of nonconformity and to liability or other issues that might merit attention. Thank you for your assistance. |
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ID: nht93-4.26OpenDATE: June 7, 1993 FROM: K. Aubrey Hottell -- Smith and Robson, Inc. TO: John Womack -- Acting Chief Counsel, NHTSA TITLE: None ATTACHMT: Attached to letter dated 7/21/93 from John Womack to K. Aubrey Hottell (A41; Std. 208) and letter dated 1/19/90 from Stephen P. Wood to Linda L. Conrad (Std. 208) TEXT: This letter is to request a Letter of Interpretation regarding air bag replacement, air bag indicator light functioning, and any requirements or recommendations for indicator lights to be functional upon resale of a vehicle. As I understand, once an air bag is discharged, an indicator light will illuminate to show that the bag needs replacement. Please send this to me at the address above. Thank you, in advance, for your assistance. |
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ID: nht93-4.27OpenDATE: June 7, 1993 FROM: Willaim (William) C. Longo -- Chief Executive Officer, Ram Off Road Accessories TO: Office of the Chief Consel, NHTSA TITLE: None ATTACHMT: Attached to letter dated 9/29/93 from John Womack to William C. Longo (A41; Std. 208) TEXT: Ram Off Road Accessories is a manufacturer of aftermarket tubular steel bolt on products such as Grille/Brush Guards, Side Bars and Bumpers. Most of our products attach to existing bodywork on the intended application, but with more vehicles being equipped with the Supplementary Restraining Systems (SRS) we are concerned about the possible liabilities involved with marketing our products. Especially, would a permanent disclaimer affixed to the product as well as disclaimers on all printed material be sufficient? How can we determine what lengths are necessary to limit our liability as well as inform the consumer of the product's intended use. I have written this letter as brief as is possible, but if more information is necessary or if it needs to be addressed to another department, please let me know. Thank you in advance for your attention to this matter. |
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.