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: nht93-1.5OpenDATE: January 8, 1993 FROM: Paul Jackson Rice -- Chief Counsel, NHTSA TO: Eugene Berk -- Food and Drug Administration, Center for Devises and Radiological Health, Office of Compliance and Surveillance TITLE: None TEXT: This follows up on telephone conversations between you and Deirdre Fujita of my staff about a letter you received from the Medical Device Inspection Company (MDI) concerning the "Tumble Forms LifeSeat." While much of the information in the letter is subject to a claim of confidentiality, Ms. Carolann Kotula-Cook of MDI told us that we can provide, for purposes of a letter that will be placed in the public docket, the following description of the LifeSeat. The LifeSeat is described by MDI as "a safety seat designed to protect children who are riding in emergency medical vehicles. The seat is designed to be secured to the ambulance stretcher or cot... (and) may also be secured to the vehicle's captain's chair." You ask whether the LifeSeat is a "child restraint system" regulated by Federal Motor Vehicle Safety Standard No. 213, "Child Restraint Systems." As discussed below, the answer is yes. Standard No. 213 specifies requirements for child restraint systems used in motor vehicles and aircraft, to reduce the number of children killed or injured in motor vehicle crashes and in aircraft. The term "child restraint system" is defined in S4 of the standard as "any device except Type I or Type II seat belts, designed for use in a motor vehicle or aircraft to restrain, seat, or position children who weigh 50 pounds or less." As described in MDI's letter, the LifeSeat meets the child restraint system definition, since it is designed to restrain or seat a child in a motor vehicle. Under the National Traffic and Motor Vehicle Safety Act, each child restraint system that is sold in or imported into the United States must be certified as complying with Standard No. 213. Since the LifeSeat is a child restraint system, it must be certified as complying with Standard No. 213. We informed Ms. Kotula-Cook that it appears the LifeSeat would not comply with some of Standard No. 213's requirements. We have sent her a copy of the standard, and an information sheet for manufacturers of motor vehicles and motor vehicle equipment. The information sheet describes manufacturers' responsibilities under Federal law for manufacturing vehicles and items of equipment, such as the responsibility to ensure these products do not have any safety-related defects. Ms. Kotula-Cook said that MDI will be contacting us directly for more information about Standard No. 213 and these responsibilities. We are returning the copy of MDI's letter you provided us. If you have any questions, please call Ms. Fujita at (202) 366-299. |
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ID: nht93-1.50OpenDATE: February 26, 1993 FROM: Vincent Schulze -- Chief, Motor Carrier Inspection and Investigation, State of New Jersey, Department of Transportation TO: Ron Havelar -- Office of Motor Carrier Standards, Federal Highway Administration COPYEE: D. Webb TITLE: RE: FMVSS No. 217 Bus Emergency Exits MC 83-93 ATTACHMT: Attached to letter dated 6-2-93 from John Womack to Vincent Schulze (A41; Std. 217). TEXT: Questions have arisen as to the interpretation of a position of FMVSS 217 pertaining to emergency exits on buses. This office has always defined an emergency exit on a bus as a window or door that must open PERPENDICULAR to the surface of a bus, such as a car door, for example. A bus company has presented a bus to this Department for inspection which has side windows that SLIDE OPEN as opposed to opening PERPENDICULAR to the bus surface. This office has rejected the bus for not meeting the requirements of FMVSS 217 (S5.4) which states that the push-out window or other emergency exit shall ... be manually extendable ..... My question is this -- can a bus meet the requirements of FMVSS 217 by having side sliding windows? Thank you for your anticipated response.
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ID: nht93-1.6OpenDATE: January 13, 1993 EST FROM: Paul Jackson Rice -- Chief Counsel, NHTSA TO: Guy Boudreault TITLE: None ATTACHMT: Attached to letter dated 11/01/92 (EST) from Guy Boudreault to U.S. Dept. of Transportation; U.S. Senate Committee on Science, Commerce & Transportation; U.S. NHTSA; National Transportation Safety Board; U.S. Office of Motor Carriers TEXT: This responds to your letter expressing concerns about certain working conditions that you have experienced as a driver of a commercial vehicle, and asking about rules and regulations that apply to the adjustment of brakes on commercial vehicles. I am pleased to have this opportunity to respond to you. By way of background information, this agency, the National Highway Traffic Safety Administration, is authorized by the National Traffic and Motor Vehicle Safety Act to issue Federal motor vehicle safety standards applicable to new motor vehicles and motor vehicle equipment. We have issued a number of safety standards that apply to heavy vehicles, including ones on brakes and lighting. This agency does not have the authority to regulate the use of motor vehicles. Your letter concerns in-service safety requirements for commercial vehicles and drivers, rather than safety requirements that apply to new motor vehicles. Within the U.S. Department of Transportation, the Federal Highway Administration, Office of Motor Carriers, has the authority to issue motor carrier safety regulations for interstate motor carriers and drivers. Ordinarily I would refer your letter to that agency; however, your letter indicates that you sent the same letter to the Office of Motor Carriers as you sent to this agency. I hope this information is helpful. If you have any questions about NHTSA's safety standards, please feel free to contact Marvin Shaw of my staff at this address or by telephone at (202) 366-2992. |
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ID: nht93-1.7OpenDATE: 01/13/93 FROM: JAMES L. VASKO TO: NHTSA TITLE: NONE ATTACHMT: ATTACHED TO LETTER DATED 2-11-93 FROM JOHN WOMACK TO JAMES L. VASKO (A40; STD. 108) TEXT: Brake lights are a very important part of the automobile. I have a Patent Pending on an invention called "FRONT BRAKE LIGHT SYSTEM". By utilizing the present turn signal lights without necessity and expense of adding new, complicated aparatus, but utilizes only the present lights and circuitry to notify the driver and or pedestrian in front of the vehicle that the vehicle is in braking mode. My 23 years experience as a Fremont Firefighter has proven over and over again, if this has been incorporated in all vehicles 30 years ago, thousands of accidents, injuries and deaths could have been prevented, not to mention, the millions of dollars Insurance Companies would have saved. I am interested in opening a dialogue with you and I will answer any questions you may have. This system will make driving safer and more predictible for every one, and we will be saving our own family and friends lives daily. The "FRONT BRAKE LIGHT SYSTEM" IS A WIN WIN SITUATION, MEANING, A WIN FOR THE CONSUMER, AUTOMAKER AND INSURANCE COMPANY. As it stands now, embodiments suggested by other patents in the field are expensive and require considerable hardware compared to my state of the art simple method. Looking forward to your response. |
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ID: nht93-1.8OpenDATE: January 13, 1993 FROM: John B. White -- Industry Standards & Government Regulations, Michelin TO: General Counsel -- NHTSA COPYEE: P. Jones -- Michelin TITLE: None ATTACHMT: Attached to letter dated 4-27-93 from John Womack to John B. White (A41; Std. 109; Std. 119) TEXT: From time to time we receive requests from various customers or potential customers for copies of the tests that we performed to certify that our tires comply with Federal Motor Vehicle Safety Regulations. Implied in these requests is that NHTSA requires manufacturers to perform the tests contained in the various standards (FMVSS 109, 119 and Part 575) in order to comply with those standards. Furthermore, some of these requests, including one recently from the Department of Defense, have indicated that these test results, along with test tires, are submitted to NHTSA who then provides the certification. We would appreciate it if you would clarify this situation. Your prompt reply will be appreciated. |
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ID: nht93-1.9OpenDATE: January 14, 1993 FROM: Jay Lee -- President, Pacific Agritrade Inc. TO: Jackson Rice -- NHTSA, Department of Transportation TITLE: None ATTACHMT: Attached to letter dated 3-26-93 from John Womack to Jay Lee (A40; Std. 208; VSA 108(a)(2)(A)) TEXT: We would like to import air bags for cars and light trucks from Korea. This air bag can be installed very easily and we are interested in having this product tested by your department. Please advise us on what procedures we need to take to have this product tested and approximately how long it will take. We are also interested in knowing what we can claim after we pass your tests. |
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ID: nht93-2.1OpenDATE: 03/01/93 FROM: THOMAS C. BALOGA -- MANAGER, SAFETY ENGINEERING, MERCEDES - BENZ TO: JOHN WOMACK -- ACTING CHIEF COUNSEL, NHTSA COPYEE: JERRY SONOSKY -- HOGAN & HARTSON TITLE: LONGER SEAT BELT FOR OVER-SIZE MERCEDES-BENZ OWNER ATTACHMT: ATTACHED TO LETTER DATED 3-10-93 FROM JOHN WOMACK TO THOMAS C. BALOGNA (A40; VSA 108 (a)(2)(A); STD. 209) TEXT: This refers to my telephone discussion with Ed Glancy on March 1, 1993 concerning a longer seat belt. Mercedes-Benz of North America, Inc. has been contacted by the owner of a Mercedes-Benz car who cannot use the driver-side seat belt because of his large body size (approx. 500 lbs). Since our special order 12 inch longer belt is still too short, our factory has supplied a 30 inch longer-than-standard seat belt for installation in this man's car. The extra-long belt assembly will not comply with the following aspects of Standard 209: - seat belt will not completely roll-up into B-pillar due to excessive webbing on spool; - seat belt not tested for retraction spring durability therefore may not pass the retractor cycle test; - no certification label is attached. We ask that you please advise us as soon as possible whether NHTSA will, under these circumstances, exercise appropriate discretion in non-enforcement of Standard 209 for this special seat belt installation. This discretion would be similar to Chief Counsel interpretations concerning non-enforcement of Standards when special equipment for handicapped drivers is installed. Without this action from you, the man will not be protected by a seat belt. We know that requests for extra long seat belts are likely to continue and we ask that you please advise us whether Mercedes-Benz of North America, Inc. needs to advise you of each and every special installation or whether it is sufficient for us to keep appropriate records of the VIN etc. It is our intention to advise the owner to have the original belt re-installed before selling the car. Thank you for your quick response. |
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ID: nht93-2.10OpenDATE: March 8, 1993 FROM: John Womack -- Acting Chief Counsel, NHTSA TO: Fredd Scheys -- President S.C.C. CARAT Inc. TITLE: NONE ATTACHMT: Attached to 1/27/95 letter from Philip R. Recht to Fredd Scheys (A43; Sec. 1397(b)(2); Also attached to 1/25/95 fax from Fredd Scheys to John Womack; Also attached to 11/16/92 letter from Paul Rice to Fredd Scheys TEXT: Dear Mr. Scheys: This responds to your FAX of March 2, 1993, to Taylor Vinson of this Office. You have heard that Paul Jackson Rice is no longer Chief Counsel of this agency and you request confirmation that his letter to you of November 16, 1992, remains valid. The opinion rendered you approximately 4 months ago remains unchanged and valid. For your information, once an interpretation has been issued by this Office, it remains in effect regardless of who may be Chief Counsel. Generally, an interpretation is affected only if the statute or regulation upon which it is based is amended. The interpretation furnished you was based upon the National Traffic and Motor Vehicle Safety Act and 49 CFR Part 567. Neither the Act nor Part 567 has been amended since November. Sincerely, |
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ID: nht93-2.11OpenDATE: March 9, 1993 FROM: D. E. Dawkins -- Director, Vehicle Compliance and Safety Affairs, Chrysler Corporation TO: John Womack -- Acting Chief Counsel, NHTSA TITLE: Re: NHTSA Letter of February 18, 1993 Regarding the Chrysler Corporation Petition to Manufacture 10 Chesapeake Consortium Electric Vehicles ATTACHMT: Attached to letter dated 3-24-93 from John Womack to Dale E. Dawkins (A40; Part 555) TEXT: This letter responds to your referenced letter and the subsequent phone conservation with Mr. Len Blazic of my staff on March 1, 1993. Chrysler Corporation desires to manufacture ten Chesapeake Consortium Electric Vehicles (CCEV'S) that would have no discernable safety differences to the electric TEVan vehicles, which have already been granted exemption from three MVSS's. All compliance aspects of this program remain unchanged from that of the TEVan program. The only difference between the two programs of electric vehicle development is the propulsion motors and transmissions, as were outlined in our December 16, 1992 letter. We believe that this will satisfy your need for additional information. |
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ID: nht93-2.12OpenDATE: 03/10/93 FROM: JOHN WOMACK -- ACTING CHIEF COUNSEL, NHTSA TO: THOMAS C. BALOGA -- MANAGER, SAFETY ENGINEERING, MERCEDES-BENZ OF NORTH AMERICA, INC. COPYEE: JERRY SONOSKY -- HOGAN & HARTSON TITLE: NONE ATTACHMT: ATTACHED TO TELEFAX MEMORANDUM DATED 3-1-93 FROM THOMAS C. BALOGA TO JOHN WOMACK (OCC 8353) TEXT: This responds to your letter asking whether the National Highway Traffic Safety Administration (NHTSA) will exercise its discretion not to institute enforcement proceedings with respect to a special seat belt installation in a Mercedes-Benz car owned by a man who weighs approximately 500 pounds. You stated that the owner cannot use the driver-side seat belt because of his large body size and that your special order 12-inch longer belt is still too short. You indicated that your factory has supplied a 30-inch longer seat belt, but that the extra-long belt assembly will not comply with the following aspects of Standard No. 209: --the seat belt will not completely roll up into the B-pillar due to excessive webbing on the spool; --the seat belt has not been tested for retraction spring durability and therefore may not pass the retractor cycle test; --no certification label is attached. As you are aware, our agency is authorized to issue Federal motor vehicle safety standards that set performance requirements for new motor vehicles and items of motor vehicle equipment. Manufacturers are required by the National Traffic and Motor Vehicle Safety Act (Safety Act) to certify that their products conform to our safety standards before they can be offered for sale. Manufacturers, distributors, dealers and repair businesses modifying certified vehicles are affected by @ 108 (a) (2) (A) of the Safety Act. It prohibits those businesses from knowingly rendering inoperative any elements of design installed on a vehicle in compliance with a safety standard. In certain limited situations in the past where a vehicle must be modified to accommodate the needs of a person with a particular disability, NHTSA has stated that it would consider certain violations of Safety Act provisions as purely technical ones justified by public need, and that it would not institute enforcement proceedings. This is to advise you that we will take this position for the specific factual situation cited above, as we equate the special needs of a 500 pound individual with the needs associated with a disability. I note that we expect manufacturers to provide complying seat belts that are appropriate for the normal range of occupant sizes, including large persons. Mercedes-Benz appears to do this, as it provides a (presumably complying) special order 12-inch longer belt for large persons. We recognize that a 500 pound individual is outside the normal range of occupant sizes. You stated that requests for extra long seat belts are likely to continue and asked whether Mercedes-Benz needs to advise NHTSA of each and every special installation or whether it is sufficient to keep appropriate records of the VIN. I note that if the agency was presented again with the same factual situation, we would expect to make the same decision. However, we would want to be advised of each such special installation. One of the factors behind our position is the special nature of the factual situation. If Mercedes-Benz wanted to provide extra long seat belts on a routine basis, we would expect it to provide a design that fully complies with Standard No. 209. |
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.