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: nht93-2.40OpenDATE: March 31, 1993 FROM: John Womack -- Acting Chief Counsel, NHTSA TO: Samuel Kimmelman TITLE: None ATTACHMT: Attached to letter dated 3-11-93 from Samuel Kimmelman to Chief Counsel, NHTSA (OCC 8407); Also attached to letter dated 11-1-89 from Stephen P. Wood to Samuel Kimmelman TEXT: In reply to your letter of March 11, 1993, I confirm that Mr. Wood's letter to you of November 1, 1989, remains in force as an interpretation of Motor Vehicle Safety Standard No. 108. When the hazard warning lamp system is activated, the front lamps in the system must continue to operate when the stop lamps are activated and override the rear lamps in the system. |
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ID: nht93-2.41OpenDATE: March 31, 1993 FROM: John Womack -- Acting Chief Counsel, NHTSA TO: Philip Trupiano --Auto Enterprises, Inc. TITLE: None ATTACHMT: Attached to letter dated 3-18-93 from Philip Trupiano to Taylor Vinson (OCC 8417) TEXT: This responds to your FAX of March 18, 1993, to Taylor Vinson of this Office. You seek an interpretation of provisions of 49 CFR Parts 591 and 592. You have supplemented your letter by FAXing us on March 23, 1993, a letter from Ford Motor Company dated September 17, 1992, and a copy of a work order from the Louisville Truck Centre in Canada dated September 30, 1992. Auto Enterprises is a Registered Importer (RI) under Part 592. It has contracted to represent a person who wishes to import a 1984 Ford 9000 heavy duty truck of Canadian manufacture. The truck would be imported across the border shared by North Dakota and Manitoba. The truck appears to have been manufactured as a chassis cab in the United States, and subsequently completed as a truck in Canada. Ford's letter states that the completed vehicle will comply with 18 Federal Motor Vehicle Safety Standards, that it "was designed to meet FMVSS 108 as fully as possible for the vehicle configuration as delivered at the assembly plant", and that to comply "with FMVSS 121 it may be necessary to do the following: Add a quick release valve. Eliminate the control line to the limiting valve. Use 6 or 8 hose from foot control to quick release valve." The work order from Louisville Truck Centre states that "(t)he necessary changes have been made to comply with safety standard FMVSS 121" in accordance with Ford's letter." We assume, of course, that Ford's letter identifies the truck in question as your letter did not convey the VIN of the vehicle. You wish to proceed as follows and ask for our concurrence under Parts 591 and 592. Because of the distance involved in driving the truck to Michigan and back (approximately 4,000 miles), you wish to facilitate entry by mailing Auto Enterprise's RI certification label to its customs broker at the contemplated port of entry to be affixed there. Appropriate photographs of the certification would be taken and submitted to NHTSA as part of the RI conformance package required for bond release. During the period before release of the bond, the truck would be in the custody of the importer. However, because the truck cannot be registered in North Dakota without a copy of the bond release letter, the importer would be effectively prohibited from licensing it for use. The truck involved was not originally manufactured to conform to all applicable Federal motor vehicle safety standards. It may not have been completed to meet the lighting standard. In addition, modifications were recently made with the intent of conforming it to the U.S. standard on air brakes for trucks. While Ford's letter is informative, it falls short of a manufacturer's certification of compliance. Although the vehicle could in fact now conform to all applicable Federal Motor Vehicle Safety Standards, that fact must be verified by Auto Enterprises as the applicable RI, and its certification of that fact provided to NHTSA. This agency's initial interpretation of The Imported Vehicle Safety Compliance Act of 1988 was that it forbade conformance work to be performed outside the United States, but that conformance work could be performed in the United States either by the RI or its agent. However, Part 592 as adopted reflects a modified view. It allows conformance work outside the U.S. subject to verification by the RI. As NHTSA stated in the preamble to the final rule (54 FR at 40084) a principal obligation of the RI is "(1) to bring those vehicles into compliance, or to demonstrate that they have been brought into compliance before importation." Further, as NHTSA noted at 40086, after consideration of comments it did not adopt "those aspects of the proposal that countenanced delegation of conformance responsibilities to an agent." In light of the above, we do not believe that Auto Enterprises can, in good faith, affix its certification of compliance to the Canadian truck without verifying its compliance, and we do not believe that it can delegate that task to the Customs Broker who would thereby become its agent for this purpose. With respect to whether the importer may have custody of its vehicle, The Safety Compliance Act appears to require that it is the RI who has custody, for it clearly states that RIs shall not release custody of any motor vehicle for which they have responsibility (15 U.S.C. 1397(c)(3)(E)(i)) until after they certify approval and have been notified by NHTSA that the conformance bond is released. Given the possibility that the truck in question may be in de facto compliance with the safety standards, and in recognition of the practical problems involved, we suggest that Auto Enterprises send an employee to inspect the vehicle on the day that it is entered under bond. If your employee concludes that the truck apparently now conforms to Standards Nos. 108 and 121, as well as remaining in compliance with the 18 other applicable standards, (s)he may then affix the certification of compliance. When this is done, your employee may complete and FAX the compliance documentation to NHTSA. We will endeavor to accord this submission priority treatment so that, if it is in order, we can release the bond without delay, probably within one workday. In the interim, the truck would be in the custody of your employee. We believe that this course of action would meet both the law and your practical concerns. |
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ID: nht93-2.42OpenDATE: March 31, 1993 FROM: Michael Love -- Manager, Compliance, Porsche Cars North America, Inc. TO: Mary Versailles -- Office of Chief Counsel, NHTSA TITLE: Request for Interpretation ATTACHMT: Attached to letter dated 7-8-93 from John Womack to Michael Love (A41; Std. 208; Std. 209; Std. 210; Part 571) TEXT: Under provisions of 49 CFR 571.208 S 4.1.4.2, integral Type seat belts are required at rear outboard seating positions of passenger cars. "Designated seating position" is defined in 571.3(b) as a location capable of accommodating a 5th percentile adult female. In certain instances, rear seats can at certain times meet the definition of designated seating position and other times not. For example, a seat with a folding seat back may be a seating position with the seat back in the up position and not with the seat back folded forward over the seat base. Another example of this could be if a platform or other device has several positions, one of which covers the seat so as to remove the necessary room to meet the designated seated position criteria. Porsche's interpretation of such situations where a seat sometimes meets the designated seating position criteria is as follows: - When the seat meets the criteria, then seat belts must be provided according to the requirements of 571.208. In addition, those belts, since required by 571.208, must also meet the requirements of 571.209 and 571.210. - When the seat does not meet the criteria, then seat belts are no longer required by 571.208. Any seat belts provided in this situation must no longer meet requirements of 571.208, 209 or 210. Porsche requests NHTSA's concurrence with this interpretation. If you should have any questions, please contact me at 702/3483198. |
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ID: nht93-2.43OpenDATE: April 2, 1993 FROM: T. Kouchi -- Director, Stanley Electric Co., Ltd. TO: Paul Jackson Rice -- Chief Counsel, Department of Transportation, NHTSA TITLE: Automotive Tail & Stop Lamps Using Light Emitting-diodes (LEDs) ATTACHMT: Attached to letter dated 4-26-93 from John Womack to T. Kouchi (A41; Std. 108) TEXT: Thank you for your answer to our questions regarding the above subject by your letter of December 30, 1992. In your answer, there is your view that any device that contains more than three lighted sections, or LEDs, need only comply with the requirements prescribed for three lighted sections. According to your view, we consider that the lamps having three lighted sections described in the attached drawing No. 1 & No. 2 need only comply with the photometric requirements prescribed for three lighted sections. So, we would like to have your opinion if our idea is appropriate. Your kind answer will be highly appreciated.
Attached to Drawings No. 1 and No. 2 of LEDs. (Drawings omitted.) |
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ID: nht93-2.44OpenDATE: April 5, 1993 EST FROM: :Linda Roberson -- President, Body Safety Kids Club, Inc. TO: NHTSA TITLE: None ATTACHMT: Attached to letter dated 6-25-93 from John Womack to Linda Roberson (A41; Std. 213; VSA 102); Also attached to letter dated 2-25-92 from Paul Jackson Rice to Phil Gray (VSA 108(a)(2)(A)); Also attached to letter dated 9-6-84 from Frank Berndt to Phillip Ables. TEXT: Dr. Jeff Michael has talked with me this morning, and has very kindly given me your name and information to ask you to consider. I have enclosed two safety harness that I have two patents on. One is to the safety of tethering the child and one is a divisional patent to a safety club and ID system for children. There are several things here that I need information about and I enclosed some information for you to see what the safety club, in the future will evolve into, I hope. My main concern with your council is for safety also when the child is riding in the car. I would like for these children to have a safety device when they are out with their guardian, and also when they are going to or returning from outings, etc. I have also enclosed a little hanging tag which is to be redone for the harness and to hang on for information. I have corrected some mistakes, and I also want to know what I can say when marketing these little harness. For my older grandson, I use the blue harness and I take the shoulder strap and go down through diagonally to keep it out of his hands and to keep it out of his face area. I would like very much for this to be tested. I have used it on him, but thankfully have never had any accident, or quick stops and I wondered if your testing lab and dummy could test this aspect. For the pink harness I have stapled or pinned a replica of a lap seat belt and how it passes through my harness for the 3 year old, before that age, they are in car seats. I say 35 pounds for this age, and approximately 34-40 pounds for the previous shoulder strap. Using the seat belt, I think this harness could also be labeled as an accessory to the seat belt; because when it is so threaded through the child cannot stand up and come out of their position. So many times they just slip out since the seat belt just goes across the lap and you turn around and the child is standing up. A very unsafe situation. I have designed these harness so the child can't remove them, so they can grow with them, and so there is at least an inch on either side of the child waist band allowing for your seat belts and for growth. The pink is a stronger webbing, and this was designed for blind children and hyperactive children and children who need extra strength. The regular harness in the summer material is the manufacturers. I have not started to manufacture the harness for the blind, as I have an improvement patent that is going in and it has lots of accessories on the harness for their needs. I am going to try and write and find out the association where I could get my product tested for the high chair and my accessory belt in conjunction with the harness. If you know of any association on a federal level, please advise me. I also wanted to know if I could get approval from the council on new products to get my harness tested, but I don't know how to do that. I am a nurse anesthetist and I work full time and also for the past two years part time in addition, but I have obtained 3 patents and have been trying to market and get manufacturing, etc. I am so tired and so broke, I just need help, assistance, or guidance. I am going to do a booth with the Governors Hwy. Safety in Asheville 14-16 of this month and I gave them harness (6) for door prices, but only for tethering children in crowds. I do know this works for me and my grandson, but unfortunately they are in Fla. and I can't get their pictures with seat belts. I did some shading and drawings and they are attached, and tried to run a prototype of a shoulder strap and seat belt through the harness to show you how I threaded them. I just don't want to advertise wrong, or to do anything unsafe, or to be sued. I have just been selling these to two little stores and a lot of acquaintances. I have given these little things I printed up, but I put the size 50 lbs. Truly it should be 35-40 lbs. Because the child starts to use these two devices by themselves at this age and weight. Age 3 1/2-4. I also wanted you to look at my little paper that I will be including later for children as a service. My grandson got lost at Disneyworld 3 1/2 year ago for several hours and he had been wearing a wrist harness and he took it off. The lost and found was not for kids so I developed a safety emblem and an ID code and registration card for kids. Right now I am not using the club for record keeping as I can't afford it and I am using the information only as a warranty for the parent for the harness, but someday I would like to help the hwy. and local police to ID children, just from the harness number. My main aspect is to keep them from being lost, or keep them from getting hurt in cars in travel. I would greatly appreciate any help you may give me or direction. Mr. Michael did not advise me to send the harness, but since I am the only employee of this business and I have to do everything, I just don't have the time to keep duplicating myself, and I certainly need help quickly, as I have told people this is something I do. I do not want to advise people wrongly, or harm anyone. Can you put these harness on dummies and try the seat belt and shoulder strap. Then, does this look like the harness can meet these standards you have an accessory to the existing seat belt and or shoulder strap for kids a certain age. What age, or weight do your standards allow children to use the two items mentioned without a car seat? These items go over clothing so they do not have to be fire repellent as they are just like clothes. I always have one side cotton and the other water repellent or nylon to give strength and protection to chest area. I am sure I must meet some sort of performance standards as a safety harness and for you as a safety belt accessory. The harness is better and safer for kids than any existing harness, and I have a patent readying for disabled kids of all kinds. Isn't there anybody who can give me information on a grant or something as I have a very good patent for the existing seat belts, they are not right for children and I just can't afford to pay out anymore or work anymore to get this accomplished. It would certainly help children in travel, we could also eliminate many devices that are sold in conjunction with safety in the high chair, and car to make children more comfortable and safer. I have enclosed some information for your review, I have not yet sent Good Morning America any harness and I certainly did not want to go on the air and say anything about a seat belt and be incorrect. The second letter is from a woman who my sister sold a harness to when she was in London last year because the child kept leaving the parents side at the airport. You see I am in a dilemma and I work on this stuff most of my off time from work. I also think having proof that this was indeed safe would greatly help me to market, not to mention the additional safety of kids; running out into moving cars, getting lost or missing; in cars to keep them in position, and even in high chairs in conjunction with little belts. We have a coloring booklet I am doing now and waiting for pictures to give children and parents instructions on safety and use of the harness. I would greatly appreciate any help you can give me, my phone number is on page one. Any additional information you can think of I would appreciate. I am thanking you most sincerely. P.S. On that sheet for the Safety Club and my club number, if and when I can ever afford to dot this as a service, how will law enforcement personnel know this is available, I still don't have a computer. Maybe this portion could be not for profit???
Attachments: - Body Safety Kids Club, Inc. Sales Brochure and Instruction/Direction Sheet - Diagram of Body Safety Kids Club Vest - Letter dated 3-2-93 from R. T. Sawyer, Director, Biopharm Limited to Liz Davies, Buying Director, MotherCare (Text omitted.) |
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ID: nht93-2.45OpenDATE: April 6, 1993 FROM: Dale Moore -- CIC, Hagan Hamilton Insurance & Financial Services TO: Walter Myers -- Office of Chief Council, NHTSA TITLE: None ATTACHMT: Attached to letter dated 8/2/93 from John Womack to Dale Moore (A41; VSA 103(14); Part 571.3) TEXT: I am an insurance broker representing a local college. We presently provide insurance coverage for their automobiles which are used for transportation of students. One such program involves transportation of high school age students from their homes to the campus and on field trips. This is done with 15 passenger vans which we are told may have to meet federal requirements in order to be leased or purchased from an automobile dealer. We are of the opinion that since this program is not affiliated with the local high school, nor is it strictly academic, that the "school bus" 10 passenger rule does not apply. I should add that the college is privately owned. We will appreciate a ruling as soon as possible because of the financial commitment which has to be made to continue this program. I have enclosed course information to assist you in making your decision.
Attachment Course information on Linfield College and Upward Bound (text omitted). |
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ID: nht93-2.46OpenDATE: April 7, 1993 FROM: Donald W. Vierimaa -- Vice President, Engineering, Truck Trailer Manufacturers Association TO: Dorothy Nakama -- Office of Chief Counsel, NHTSA TITLE: Subject: Vehicle Identification Number (VIN) ATTACHMT: Attached to letter dated 6-29-93 from John Womack to Donald W. Vierimaa (A41; Std. 115; Part 567). TEXT: Section 4.6 of TTMA's Recommended Practice Number 56-91, "Trailer Vehicle Identification Number," states the following: 4.6 Rebuilt Trailers If a rebuilt trailer meets the requirements of 49 CFR 571.7(f) as being newly manufactured, the rebuilder must furnish a new VIN. If the rebuilt trailer is considered not new by this requirement, the VIN of the original trailer shall be used in the legal paperwork, but there is no legal requirement to physically retain the VIN on the trailer. A person has questioned whether the statement that "there is no legal requirement to physically retain the VIN on the trailer" is correct. Please inform us as to whether this statement is correct. It is my understanding that an owner of a motor vehicle is not prohibited from removing a VIN label from his motor vehicle. |
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ID: nht93-2.47OpenDATE: April 8, 1993 FROM: John Womack -- Acting Chief Counsel, U.S. Department of Transportation, NHTSA TO: Jane L. Dawson -- Specifications Engineer, Thomas Built Buses, Inc. TITLE: None ATTACHMT: Attached to letter dated 3-5-93 from Jane L. Dawson to Walter Myers (OCC 8418) TEXT: This responds to your letter of March 5, 1993 asking if an exterior handle is required for emergency exit windows under the recent final rule amending Standard No. 217, BUS WINDOW RETENTION AND RELEASE (November 2, 1992; 57 FR 49413). As explained below, the answer is no. The final rule added a new section S5.3.3.2 to Standard No. 217 which reads: each school bus emergency exit window shall allow manual release of the exit by a single person, FROM INSIDE THE PASSENGER COMPARTMENT (emphasis added). Thus, unlike doors and roof exits, a release mechanism is not required on the outside of emergency exit windows. I hope you find this information helpful. If you have any other questions, please contact Mary Versailles of my staff at this address or by phone at (202) 366-2992. |
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ID: nht93-2.48OpenDATE: April 9, 1993 FROM: Lawrence Hufstedler -- Kesler Research Enterprises, LTD.; Raymond Kesler -- Kesler Research Enterprises, LTD. TO: John Womack -- Acting Chief Counsel, U.S. Department of Transportation, NHTSA TITLE: None ATTACHMT: Attached to letter dated 4-27-93 from John Womack to Lawrence Hufstedler and Raymond Kesler (A41; VSA 108(a)(2)(A); FMVSS 111) TEXT: We would like to thank you for the meeting of April 8, 1993, concerning the Advanced Technology Rear View Mirror Concept. We have been researching and developing this product since 1986. It was indeed a pleasure to come in to your office and introduce you to the concept as well as the actual hardware. Let us take a moment to also thank Mr. Marvin Shaw of your legal department for his guidance and legal expertise in helping us understand the governmental aspect of our improved concept. Also, Mr. Mike Perel from your Research and Development department for his input concerning federal testing procedures. Let us not forget Mr. Rich Van Iderstine and Mr. Pat Boyd, from the office of Rule making. They were able to guide us through positive and enlightening particulars in their area. During the meeting your agency representatives spoke of Federal Motor Vehicle Safety Standard # 111. We would appreciate your written response confirming that FMVSS # 111 states, that a "passenger vehicle weighing under 10,000 lbs. and having a left side and an interior mirror (field of view) that comply with the specifications in the standard may use any mirror of the (OEM) manufacturers or owners choice or, use no mirror at all on the right side of their vehicle. As this matter is of extreme urgency to us, ,we look forward to hearing from you soon. Again, we thank you for your unyielding thoughtfulness of public safety. |
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ID: nht93-2.49OpenDATE: April 13, 1993 FROM: John Womack -- Acting Chief Counsel, U.S. Department of Transportation, NHTSA TO: Carl W. Ruegg -- President, Carlo International, Inc. TITLE: None ATTACHMT: Attached to letter dated 3-29-93 from Carl W. Ruegg to Taylor Vinson (OCC 8512) TEXT: This responds to your letter of March 29, 1993, to Taylor Vinson of this Office. In response to your request for "information and regulations regarding the importation of non-conforming vehicles for research, investigation, studies, demonstrations," I enclose a copy of 49 CFR Part 591, the regulation governing the importation of motor vehicles and equipment subject to the regulations of this agency, and a copy of a final rule published March 8, 1993, that amends the regulations. Sections 591.5(j), 591.6(g) (as amended), and 591.7 (as amended) apply to your inquiry. If you have any questions regarding the interpretation of the regulation or amendments, you may contact Mr. Vinson (202-366-5263). Questions regarding the implementation of the regulations, such as the information deemed acceptable to acquire the agency's pre-entry letter of approval, should be addressed to the Office of Vehicle Safety Compliance. You may contact Clive Van Orden with questions of this nature (202-366-2830). |
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.