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: nht94-1.54OpenTYPE: Interpretation-NHTSA DATE: February 14, 1994 FROM: Lawrence A. Beyer -- Attorney at Law TO: Z. Taylor Vinson -- Office of Chief Counsel, NHTSA TITLE: None ATTACHMT: Attached to letter dated 3/7/94 from John Womack to Lawrence A. Beyer (A42; Std. 108) TEXT: This letter requests an opinion letter from your office concerning the re-importation of a certified vehicle. My client wishes to re-import vehicles which were certified by the original manufacturer and purchased in the U.S. These vehicles would then be modified and sent back to the U.S. The vehicles in question are motorcycles which would then have a shell pl aced around it. The frame would be slightly modified and seating lowered to incorporate the design. However, my client would not knowingly render inoperative wholly or in part any device or element of design installed in accordance with the FMVSS. On November 16, 1992, your office issued a letter regarding this matter. Please advise me if this letter is still your interpretation. |
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ID: nht94-1.55OpenTYPE: Interpretation-NHTSA DATE: February 14, 1994 FROM: Gary D. March -- Director, Illinois Department of Transportation, Division of Traffic Safety TO: John Womack -- Acting Chief Counsel, NHTSA TITLE: Docket No. 88-21; Notice No. 3; 57 FR 49413, November 2, 1992 ATTACHMT: Attached to letter dated 3/24/94 from John Womack to Gary D. March (A42; Std. 217) TEXT: On November 2, 1992, NHTSA published a Final Rule which revised the minimum requirements for school bus emergency exits and improved access to school bus emergency doors. I am sure you would agree that the purpose of this rulemaking was to enhance the s afety of children being transported in school buses. The Docket states that this Final Rule is effective May 2, 1994. We at the Illinois Department of Transportation interpret this Docket to mean school buses manufactured on or after May 2, 1994 must c omply with these new standards. In September of 1993, we were asked the following question by a school bus distributor here in Illinois: Does the vehicle's "date of manufacture" correspond to the vehicle's chassis completion date or the vehicle's body completion date? In essence, he asked when do manufacturers have to comply with this Docket? On September 27, 1993, Ms. Catherine Allen of my staff spoke to Mr. David Elias of NHTSA and asked him the above question. He indicated the date of manufacture is correlated to the vehicle's date of completion. The vehicle's date of completion correspo nds to the date when the body and chassis are combined to form a completed vehicle. Therefore, we interpreted that answer to mean vehicles "combined" on or after May 2, 1994 must comply with this Docket. On February 2, 1994, Ms. Allen spoke to Ms. Jane Dawson of Thomas Built Buses and asked if school buses manufactured on or after May 2, 1994 would meet the new standards. She replied, "Only if the chassis was manufactured on or after May 2, 1994." She indicated multi-stage manufacturers have the option of choosing the chassis manufacture date, the body manufacture date or a date in- between for the effective date of new standards. On February 3, 1994, Ms. Allen spoke to Mr. Charles Hott of NHTSA and asked him the same question. He confirmed what Ms. Dawson had said. Therefore, according to Mr. Hott's interpretation, a school bus which clearly displays a June 1994, or later, date of manufacture will not need to meet the standards of Docket 88-21 if the chassis was completed prior to May 2, 1994. Since we have received two different interpretations from Mr. Elias and Mr. Hott, we are asking for an official interpretation from the agency. Currently, school districts are in the process of taking bids on buses that will be delivered and perhaps have bodies mounted after May 2, 1994 to chassis manufactured prior to May 2, 1994. Therefore, I am sure you can understand the necessity of a prompt and official interpretation by your office. If you need any additional information from us, please contact Mr. Larry Wort at 217/782-4974 or Ms. Catherine Allen at 217/785-1181. I will appreciate your expeditious response. |
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ID: nht94-1.56OpenTYPE: Interpretation-NHTSA DATE: February 14, 1994 FROM: Daniel T. Mason -- Product Development Engineer, Automotive Division, Avery Dennison TO: Barbara Gray -- Office of Market Incentives, NHTSA TITLE: None ATTACHMT: Attached to letter dated 4/8/94 from John Womack to Daniel T. Mason (A42; Part 541) TEXT: The purpose of this letter is to ask for a ruling of the footprint requirements of the parts marking legislation, 541-Federal Motor Vehicle Theft Prevention Standard. I am a Product Development Engineer working under Cliff Nastas for Avery Dennison. My question refers to the footprint feature of the label that appears under a UV light in the substrate after the label (illegible words). Both Avery Dennison and (illegible word) supply parts marking labels to the automotive industry. Both have a florescent agent that migrates into the substrate once applied. Would a label that substitutes a florescent copy of the VIN instead of the whol e footprint of the label be in compliance to the federal legislation? Please inquire for a ruling on this. I will follow up this letter with a phone call to discuss any questions you may have in the next couple weeks. |
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ID: nht94-1.57OpenTYPE: Interpretation-NHTSA DATE: February 14, 1994 FROM: Lawrence A. Beyer, Esq. TO: Z. Taylor Vinson, Esq. -- Office of Chief Counsel, NHTSA/DOT TITLE: None ATTACHMT: Attached to letter dated 4/11/94 from John Womack to Lawrence A. Beyer (A42; Part 591; Part 592) TEXT: This letter requests an opinion latter from your office concerning a determination made my OVSC regarding the importation of vehicles from Canada. OVSC has allowed the importation of vehicles which conform to Canadian safety standards, and U.S. safety standards with the exception of "minor labeling requirements." These vehicles must be for the owner's personal use. OVSC has interpreted "personal use" to exclude importations of vehicles by corporations for their corporation's personal use. For example, an individual moving to the U.S. would be allowed to import a vehicle, provided he had a statement from the manufa cturer that the vehicle complied with all FMVSS with the exception of labeling. However, a company moving to the U.S. with the identical vehicle and letter would be required to import the vehicle through the R.I. program, under bond, etc. I agree that if the company was importing the vehicle for resale, the R.I. program is necessitated. I do not understand the distinction OVSC makes between individual personal use and corporate personal use. Please provide me with an interpretation to settle this issue.
ATTACHMENT PERMANENT IMPORTATION OF CANADIAN VEHICLES PERSONAL USE (Not included - vehicles owned by business or used in commerce) If an individual has a letter from the manufacturer stating that a Canadian vehicle was manufactured to comply with the U.S. Federal motor vehicle safety, bumper and theft prevention standards (FMVSS), except minor labeling: a. A letter is provided by our agency that it is satisfactory to import the vehicle under the Box 2 category on the declaration statement (Form HS 7). b. The HS-7 form must be completed with Box 2 checked and a copy of the manufacturers letter and our correspondence must be attached. c. If a manufacturers letter isn't available - a registered importer must be used. FOR SALE Such vehicles have to be imported by a registered importer (The RI is not necessarily the owner. If the vehicle manufacturer provides a letter that the vehicles comply except for minor labelling, we will require: a. An HS-7 form indicating the registered importer (RI) as the importer of records. A Box 3 entry will be required. b. A compliance package showing any modifications that were required including photos of the speedometer and Canadian certification label, DOT bond, and payment of appropriate fees. c. Warranty Insurance Policy MANUFACTURERS LETTERS Since we have previously made a determination about Canadian vehicles that was published in the Federal Register, if a manufacturers letter is not available, the process also falls into a Box 3 category. We will require all of the items listed above. I f a Canadian vehicle was built on or after September 1, 1989, if it is not on our approved-eligible vehicle list, and if the MANUFACTURER DOES NOT INCLUDE AUTOMATIC RESTRAINTS THAT COMPLY WITH STANDARD NO. 208, or any other crash survivability standard, a petition will be required and it will have to be entered as a Box 3 (formerly allowed for determination under Box 7). HOWEVER If the vehicle is equipped with the necessary automatic restraints and other modifications required to meet U.S. Federal motor vehicle safety standards but the manufacturers letter is not available, the RI DOES NOT have to petition if it can verify ident icality with a car certified by its original manufacturer to meet the U.S. Standards by part numbers, drawings etc. |
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ID: nht94-1.58OpenTYPE: Interpretation-NHTSA DATE: February 14, 1994 FROM: Richard Kreutziger -- Executive Director, New York State Business Distributor Ass'n, Inc. TO: Walter Myers -- Attorney Advisor, NHTSA TITLE: None ATTACHMT: Attached to letter dated 3/28/94 from John Womack to Richard Kreutziger (Std. 217; USA 103(d)); Also attached to letter dated 2/20/87 from Erika Z. Jones to Martin V. Chauvin TEXT: I am following up on the fax that I sent to you dated January 12, 1994. As of this date - I have not received a response, to the question that was raised during our verbal conversation, and which I requested a formal written response in the aforementioned fax. Will greatly appreciate your follow-up with the written formal response. Another question has developed pertaining to the implementation of FMVSS 217 (amended). New York State school bus regulations - Chapter VI transportation regulations - article 3 safety part 721 requires two side emergency doors on vehicles of greater th an 67 pupil capacity. New York State also - in the past has required the side emergency doors to be "to the rear of center of the passenger compartment?" - they have just recently amended their regulations to conform t the FMVSS as to location "as near center of passenger compartment" - and have also in my reading have required both the left and right side emergency doors in center - BUT not in the same body section. The question is raised by some of the manufacturers/distributors - can the right side emergency door be located to the rear of the passenger compartment?
TEXT OF RICHARD KREUTZIGER'S 1/12/94 FAX TO WALTER MYERS: In a follow-up to our morning phone conversation of this date, I hereby formally request a written response (preferably by fax) to the point of discussion in reference to the ability of any individual state agency to require that an entity other than a p olitical sub-division of the state (such as a school district) had only to meet the requirements/standards/regulations of NHTSA and not added individual state regulations, even if such regulations exceed the federal standards. Example: "ABC" Central School - is required in their purchase of a school bus to transport students to and from home to school - and/or to transport students to school sponsored events - such vehicle must meet the prescribed FMVSS and to further meet the individual state regulations that exceed the FMVSS. "XYZ" Bus Company - has a contract with "DEF" school district to transport the school pupils of the district to and from home to school, and/or school sponsored events. Because this entity is not a political sub-division the state enforcement agency relating to school bus regulations can not mandate that this private enterprise meet the state regulations that exceed the FMVSS - the only requirements for this private entity and their school buses are those that are mandated b y FMVSS. I hope my interpretation of our phone conversation, reflects your |
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ID: nht94-1.59OpenTYPE: INTERPRETATION-NHTSA DATE: February 14, 1994 FROM: Donald P. Green TO: U.S. Department of Transportation -- NHTSA TITLE: None ATTACHMT: Attached To Letter Dated 6/9/94 From John Womack To Donald Green (A42; Std. 109; 120) TEXT: Gentlemen: I am seeking official professional advice regarding the use of passenger radial tires on recreational--pull type--trailers. I have made numerous inquiries to various tire dealers and in nearly every case they have refused to consider the installing of passenger radial tires on a trailer, stating that this tire's construction with a soft sidewall could cause an uncontrollable swaying condition that could result in a serious accident. They would only install special trailer tires or light truck tires that have stiff sidewalls and are designed to operate at higher pressures resulting in a harder ride but stable condition. I had the misfortune, in an emergency situation, allowing a professional tire dealer to install a set (4) passenger radials (P215-75R15) on a 1989 trailer, since they did not have one tire to match the F78-15ST "C" rating tires that were supplied with th e trailer from the manufacturer. The result was that several months later I became the victim of an upset of the trailer and the towing vehicle, that was triggered by a cross-following wind that caused the soft sidewall tires to squish to one side, forcing the tow vehicle into the adjoi ning left lane of a two lane divided highway. When I attempted to correct the tow vehicle the trailer reversed its attitude, overcame the Reese anti-sway systems and went into a horrifying jackknifing that ended with both trailer and tow vehicle overtur ned. My passenger and I were using lap and shoulder harnesses and escaped without injury. No other vehicles were involved. The 1990 GMC Suburban received $ 8,000.00 damage, the trailer was cashed out by the insurance company. I have checked with the dealer that installed the passenger radials and he claims no responsibility or negligence, saying tires were of correct size and load carrying capacity, and that there is no regulation, local, state or federal, that prohibits inst alling radial passenger tires on a trailer. It does seem odd that this application is allowed since it seems to be the opinion of most tire dealers that the use of these tires on trailers is a hazard to both the driver of the tow vehicle and other appro aching or passing vehicles. I do not believe that I was an isolated case, and have since heard of similar accidents happening from the same cause. Your advice and reply would be appreciated. Sincerely yours, |
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ID: nht94-1.6OpenTYPE: INTERPRETATION-NHTSA DATE: 01/01/94 EST FROM: Frances J. Chamberlain TO: John Womack -- NHTSA TITLE: NONE ATTACHMT: Attached to 2/6/95 letter from Philip R. Recht to Frances J. Chamberlain (A43; VSA 102(4)) TEXT: I am writing in regards to car accessory regulations. I have been working on a design that would attach to the back side of the drivers and passengers seat. I have researched the regulations contained in Title 49 (Transportation) of the Code of Federal Regulations and (Parts 500-599) by the National Highway Traffic Safety Administration. Are there regulations as to the distance that must be clear between the back side of the drivers seat and the back seat? This is an emergency accessory and could also be kept under the seat. I am trying to find an interior space of the automobile to att ach or store this unit. Once again I would like to attach this unit to the back side of the front seat and would appreciate any help you may be able to offer as I put together the final component. If you need further information I may be reached at 1-206-658-0579. That is my residence. I am working on this project currently and would appreciate your response. Sincerely, |
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ID: nht94-1.60OpenTYPE: INTERPRETATION-NHTSA DATE: February 14, 1994 FROM: March, Gary D. -- Director, Illinois Department Of Transportation, Division Of Traffic Safety TO: Womack, John -- Acting Chief Counsel, NHTSA TITLE: Docket No. 88-21; Notice No. 3 57 FR 49413, November 2, 1992 ATTACHMT: Attached To 10/01/94 (EST.) Letter From John Womack To Gary D. March (A42; STD. 217; Part 586) TEXT: On November 2, 1992, NHTSA published a Final Rule which revised the minimum requirements for school bus emergency exits and improved access to school bus emergency doors. I am sure you would agree that the purpose of this rulemaking was to enhance the s afety of children being transported in school buses. The Docket states that this Final Rule is effective May 2, 1994. We at the Illinois Department of Transportation interpret this Docket to mean school buses manufactured on or after May 2, 1994 must c omply with these new standards. In September of 1993, we were asked the following question by a school bus distributor here in Illinois: Does the vehicle's "date of manufacture" correspond to the vehicle's chassis completion date or the vehicle's body completion date? In essence, he asked when do manufacturers have to comply with this Docket? On September 27, 1993, Ms. Catherine Allen of my staff spoke to Mr. David Elias of NHTSA and asked him the above question. He indicated the date of manufacture is correlated to the vehicle's date of completion. The vehicle's date of completion correspo nds to the date when the body and chassis are combined to form a completed vehicle. Therefore, we interpreted that answer to mean vehicles "combined" on or after May 2, 1994 must comply with this Docket. On February 2, 1994, Ms. Allen spoke to Ms. Jane Dawson of Thomas Built Buses and asked if school buses manufactured on or after May 2, 1994 would meet the new standards. She replied, "Only if the chassis was manufactured on or after May 2, 1994." She i ndicated multi-stage manufacturers have the option of choosing the chassis manufacture date, the body manufacture date or a date in-between for the effective date of new standards. On February 3, 1994, Ms. Allen spoke to Mr. Charles Hott of NHTSA and asked him the same question. He confirmed what Ms. Dawson had said. Therefore, according to Mr. Hott's interpretation, a school bus which clearly displays a June 1994, or later, date of manufacture will not need to meet the standards of Docket 88-21 if the chassis was completed prior to May 2, 1994. Since we have received two different interpretations from Mr. Elias and Mr. Hott, we are asking for an official interpretation from the agency. Currently, school districts are in the process of taking bids on buses that will be delivered and perhaps hav e bodies mounted after May 2, 1994 to chassis manufactured prior to May 2, 1994. Therefore, I am sure you can understand the necessity of a prompt and official interpretation by your office. If you need any additional information from us, please contact Mr. Larry Wort at 217/782-4974 or Ms. Catherine Allen at 217/785-1181. I will appreciate your expeditious response. |
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ID: nht94-1.61OpenTYPE: Interpretation-NHTSA DATE: February 15, 1994 FROM: Thomas D. Turner -- Manager, Engineering Services, Blue Bird Body Company TO: George Entwistle -- Office of Vehicle Safety Compliance, NHTSA TITLE: NEF-31GEn/NCI 3302 ATTACHMT: Attached to letter dated 4/8/94 from John Womack to Thomas Turner (A42; Std. 131); Also attached to letter dated 1/26/83 from Frank Berndt to Thomas D. Turner TEXT: Last Week I received by FAX an advanced copy of NCI 3302 concerning an apparent non-compliance of stop arms with strobe lights to FMVSS 131 Section S6.2.2, "Flash Rate." Blue Bird is forwarding a copy of NCI 3302 to our supplier of stop arms, Specialty Manufacturing Company in Pineville, North Carolina, so that they can determine if a non-compliance exists. In studying the requirements of S5.3, a question has arisen. S5.3 Conspicuity states "The stop signal arm shall comply with either S5.3.1 or S5.3.2, or both." Some of the stop arms we install are reflectorized and have strobe lights. Based on NCI 3302 , it appears that the strobe lights do not comply with S6.2.2, so these stop arms do not comply with the "S5.3.2" or the "both" option of Section S5.3. However, these stop arms fully comply with the S5.3.1 option of Section S5.3; and the use of the stro be lights could be considered as optional lighting, not required by FMVSS 131 and therefore not required to meet the requirements of S6.2. NOTE: As a general rule, supplemental lighting is permitted by Standard No. 108 as long as it does not "impair the effectiveness of lighting equipment" required by the standard. (See attached letter from Chief Counsel dated January 2 6, 1983.) It is our understanding that a stop signal arm that fully complies with the requirements of S5.3.1 has satisfied the requirements of S5.3 Conspicuity, even if it has optional strobe lights installed that do not meet S5.3.2. WE REQUEST CONFIRMATION THAT THE OVSC CONSIDERS A REFLECTORIZE STOP SIGNAL ARM THAT FULLY COMPLIES WITH S5.3.1 AS COMPLIANT WITH S5.3 WITH OR WITHOUT STROBE LIGHTS INSTALLED. Your immediate response is needed so that we can proceed with work on our response to NCI 3302. |
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ID: nht94-1.62OpenTYPE: INTERPRETATION-NHTSA DATE: February 17, 1994 FROM: Karl-Heinz Ziwica -- General Manager, Environmental Engineering, BMW of North America, Inc. TO: Barbara A. Gray, Office of Market Incentives, NHTSA, U.S. Department of Transportation TITLE: NONE ATTACHMT: Attached to letter dated 8/9/94 from Barry Felrice to Karl-Heinz Ziwica (Part 543) TEXT: Dear Ms. Gray: This letter is to inform the agency that beginning with the 1995 model year, BMW will be utilizing the 7-carline parts marking exemption granted by the NHTSA on October 9, 1986 (51 CFR 3633). As was explained to you by Mr. James C. Patterson of my staff on February 7, 1994, there have been three updates to the anti-theft device previously approved on the 7-carline. Accordingly, BMW requests that the NHTSA determine these updates constitute de minimus changes to the 7-carline's anti-theft device. The following paragraphs describes the updates: 1. The remote device has become an integral component within the vehicle key and is the actuator for the alarm system. This change is identical to the change that BMW made on the 8-carline anti-theft device, which NHTSA has already determined to be de m inimus (NHTSA letter from Mr. Barry Felrice to K.-H. Ziwica dated 10/04/93). 2. The monitoring circuits for radio theft and glove box entry, now, monitor glass breakage to further ensure the security of the entire occupant compartment, rather than, the individual components. All other monitoring (e.g. doors, hood, trunk, etc.) h as remained as when the device was previously approved. 3. The anti-theft device's siren has been changed to a 112db siren. If further information is needed or you have any questions regarding this matter, please contact Mr. Patterson on (201) 573-2041. |
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.