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: aiam4740OpenTimothy A. Kelly, President Salem Vent International, Inc. P.O. Box 885 Salem, VA 24153; Timothy A. Kelly President Salem Vent International Inc. P.O. Box 885 Salem VA 24153; "Dear Mr. Kelly: This responds to your request for an interpretation o Federal Motor Vehicle Safety Standard (FMVSS) No. 217, Bus Window Retention and Release as it applies to roof exits. You asked four specific questions which I have addressed below. First, you asked for confirmation that the only specification in Standard No. 217 concerning the size of roof exits is the requirement that the exit be able to accommodate an ellipsoid with a major axis of 20 inches and a minor axis of 13 inches pushed horizontally through the exit opening. Your understanding is not entirely correct. The ellipsoid requirement to which you refer, set forth in S5.4.1 of Standard No. 217, is the only provision in the standard that specifies a minimum size requirement for roof exit openings. Although there is no maximum size limit, you should be aware that S5.2 of Standard No. 217 provides that, in determining the total unobstructed openings for emergency exit provided by a bus, no emergency exit, regardless of its area shall be credited with more than 536 square inches of the total area requirement. Thus, if a roof exit is larger than 536 square inches, only 536 square inches will be counted for the exit in determining whether the bus complies with the unobstructed openings requirement of S5.2 of Standard No. 217. Second, you asked for confirmation that Standard No. 217 does not permit the use of escape hatches or ventilators in the roof of school buses as a substitute for any of the emergency exits required on school buses by S5.2.3 of Standard No. 217. This understanding is correct. Additionally, you should be aware that the agency has a longstanding position that any emergency exits, including any roof exits, installed on a school bus in addition to the emergency exits required by S5.2.3 must conform to the requirements of Standard No. 217 for emergency exits installed on buses other than school buses. See the enclosed July 6, 1979 interpretation to Robert Kurre on this issue. Third, you asked for confirmation that Standard No. 217 permits the use of roof exits as a substitute for the rear exit door on buses other than school buses. This statement is not entirely correct. S5.2.1 of Standard No. 217 requires the use of a rear exit door on all non-school buses with a GVWR of more than 10,000 lbs., except where the configuration of the bus precludes the installation of an accessible rear exit. In that case, S5.2.1 requires the installation of a roof exit in the rear half of the bus in lieu of the rear exit. This substitution of a roof exit for a rear exit door is allowed only where the bus design precludes the use of a rear exit (such as on rear-engine buses). It is not an option allowing the substitution of a roof exit for the rear door in any design. Fourth, you asked whether the addition of more than one roof exit on a non-school bus would allow a manufacturer to delete any other required exits in addition to the rear door. It is possible that increasing the total exit space on the bus by adding roof exits could enable a manufacturer to reduce the number or size of other emergency exits on the bus and still comply with the unobstructed openings requirement of S5.2. You should be aware that exit space provided by roof exits is not counted in determining compliance with the requirement in S5.2 that 40 percent of the total unobstructed openings be located on each side of the bus. Whether this substitution of additional roof exits could be made on any particular non-school bus would depend upon whether the bus complied with the exit space and location requirements of S5.2.1 (if the bus has a GVWR of more than 10,000 pounds) and the applicable requirements of S5.2.2 (if the bus has a GVWR of 10,000 pounds or less). I hope you have found this information helpful. Please do not hesitate to contact David Greenburg of my staff at (202) 366-2992 if you have any further questions or need additional information. Sincerely, Stephen P. Wood Acting Chief Counsel Enclosure"; |
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ID: aiam1542OpenMr. John Gostomski, President, Hellstar Corporation, 1600 N, Chestnut, Wahoo, NE 68066; Mr. John Gostomski President Hellstar Corporation 1600 N Chestnut Wahoo NE 68066; Dear Mr. Gostomski: This is in reply to your letter of June 17, 1974, requesting furthe information on the applicability of Federal safety standards to auxiliary fuel tanks.; Standard No. 301 does not apply directly to auxiliary or extra-capacit fuel tanks. However, it does apply to motor vehicle fuel systems. Therefore, if an auxiliary of extra-capacity tank is installed in the fuel system of a vehicle that is subject to the performance requirements of Standard No. 301, *before* its first purchase for purposes other than resale, causing that fuel system not to be in compliance with the standard, the person installing the tank or offering the vehicle for sale would be in violation of S108(a)(1) of the National Traffic and Motor Vehicle Safety Act. Since Standard No. 301 becomes applicable to trucks with a GVWR of 6,000 pounds or less on September 1, 1976, the fuel systems of such trucks will have to meet the performance requirements of the standard as of that date.; The fact that a customer may have ordered the auxiliary o extra-capacity tank to be installed in the vehicle he is purchasing does not affect the installer's responsibilities under the Act. he would still be in violation of Standard No. 301 if the tank were installed prior to the first purchase causing the fuel system to be in noncompliance.; Auxiliary and extra-capacity fuel tanks are not subject to regulatio under Standard No. 301 where they are installed *after* the first purchase of the vehicle for purposes other than resale. However, the auxiliary and extra-capacity tanks are subject to the section of the National Traffic and Motor Vehicle Safety Act that authorizes the Secretary of Transportation to make a determination as to whether of not an item of motor vehicle equipment contains a safety-related defect. In the event that such a determination is made, the manufacturer may be compelled to notify purchasers of the hazard.; If the installation of the fuel tank occurs *before* the first purchas of the vehicle for purposes other than resale, the installer must affix to the vehicle an additional certification label stating the alterer's name, the date of the alteration completion, and that the vehicle conforms to all applicable safety standards in effect on a date no earlier than the manufacturing date of the original vehicle, and no later than the date the alterations were completed.; We appreciate your interest. Yours truly, Richard B. Dyson, Assistant Chief Counsel |
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ID: aiam1057OpenMr. Ralph L. Finley, 12476 Dover Court, Saratoga, CA 95070; Mr. Ralph L. Finley 12476 Dover Court Saratoga CA 95070; Dear Mr. Finley: Thank you for your letter of March 8, 1973, in which you reques information regarding safety standards or restrictions pertaining to rumble seat installation. The installation you have made and contemplate merchandising falls into the aftermarket category.; Aftermarket seat assemblies installed in vehicles, after the sale o such vehicles is consummated, are not required to comply with Federal Motor Vehicle Safety Standard No. 207, Seating Systems. However, it is reasonable to expect that those who manufacture, sell, and install aftermarket seats will make them at least as strong as required by the standard, and will install seat belt systems to help prevent ejection and other injuries.; I am enclosing a copy of our Summary Description of Standards an Federal Motor Vehicle Safety Standard No. 207 for your information and retention. I appreciate your interest in motor vehicle safety.; Sincerely, Robert L. Carter, Associate Administrator, Motor Vehicl Programs; |
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ID: aiam4255OpenMr. William Wallace, Assistant Manager, Chemical Commodities, New York City Transit Authority, 25 Jamaica Avenue, Brooklyn, NY 11207; Mr. William Wallace Assistant Manager Chemical Commodities New York City Transit Authority 25 Jamaica Avenue Brooklyn NY 11207; Dear Mr. Wallace: Thank you for your letter of June 19, 1985, concerning how ou regulations would affect the use of certain glazing materials in buses. You explained that the Transit Authority has recently contracted to have several hundred buses rehabilitated. As a part of that work, the side glazing of the buses was replaced with glazing that contained the following markings, 'Lexan, MR 5000 sheet, ANSI Z 26-1, Camplas, NY.'; Subsequent to receipt of your letter, we received additiona information from General Electric, the manufacturer of Lexan, concerning the glazing material used in the side windows of your buses. According to General Electric, the Lexan glazing material used in these windows can meet all of the performance requirements set in Standard No. 205 for 'AS-5' glazing materials. The glazing material apparently was not marked as 'AS-5' material. As discussed below, if the only markings on the glazing are the markings you described in your letter, the glazing apparently does not comply with the marking requirements of Standard No. 205, *Glazing Materials*.; Standard No. 205 specifies performance and location requirements fo glazing used in new vehicles and glazing sold as replacement equipment. (The various types of glazing are designated as 'items' in the standard.) Plastic glazing materials, such as Lexan, can be used in a number of different locations in a bus depending on which performance requirements the glazing meets. If the plastic glazing meets the requirements set for AS-5 glazing materials, it can be used in any window in a bus, except for the windshield, the windows to the immediate right and left of the driver, and the rearmost windows, if used for driving visibility.; In addition to setting performance requirements for different items o glazing, the standard requires glazing materials to contain certain markings. The marking requirements of S6 of the standard vary depending on the intended use of the glazing and the person that is marking the glazing. At a minimum, the standard requires the glazing to be marked with the AS number (which indicates that the material meets the performance requirements set for that 'item' of glazing material), a model number and the manufacturer's logo. The information you provided about the markings on the glazing installed in your buses indicates that the glazing does not have an AS number marked on it.; Any glazing sold for use in a motor vehicle must conform to th applicable requirements of Standard No. 205. Since there appears to be an apparent noncompliance, we have been in contact with General Electric to obtain further information about this possible noncompliance. Our regulations do not preclude the Transit Authority from operating a vehicle with noncomplying glazing materials, however, you should check with State authorities to determine the effect of New York law on operating these buses.; Thank you for bringing this matter to the attention of the agency. I you need further information, please let me know.; Sincerely, Erika Z. Jones, Chief Counsel |
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ID: aiam3590OpenMr. Terry W. Braden, President, Kamlot Marketing Inc., 4311 East 104th Street, Tulsa, OK 74136; Mr. Terry W. Braden President Kamlot Marketing Inc. 4311 East 104th Street Tulsa OK 74136; Dear Mr. Braden: This responds to your recent letter requesting information concernin the type of seat belts which must be used in the driver and passenger seats of a Ford van F150. Your company is apparently converting these vehicles by adding 'plush' seats and a rear sofa.; Paragraph S4.2.2 of Safety Standard No. 208, *Occupant Cras Protection*, (49 CFR Part 571) specifies that trucks with a GVWR of 10,000 pounds or less shall meet the same requirements of the standard that are specified for passenger cars. This would include the Ford van to which you refer. Paragraph S4.1.2.3 of the standard specifies that passenger cars must be equipped with a Type 2 seat belt assembly (non-detachable lap and shoulder belt) at each front outboard designated seating position. At all other seating positions, either a Type 1 belt assembly (lap belt only) or a Type 2 assembly must be used. Therefore, the vans that you are converting must have Type 2 belts in the two front seating positions and must have either Type 2 or Type 1 belts in the rear seating positions. The only exception to this requirement is that a forward control van manufactured prior to September 1, 1981, was permitted to have either Type 1 or Type 2 belts in front outboard seating positions. I gather from your letter that the vans you are converting were manufactured after that date and would not qualify under this exception.; You should also note that the sofa you are installing in the rear o the van would likely qualify as having three designated seating positions and would have to have three sets of seat belts (Type 1/lap belts). I assume the sofa has three seating positions since your letter states the van is a 7-passenger vehicle.; Please contact Hugh Oates of my staff if you have any furthe questions.; Sincerely, Frank Berndt, Chief Counsel |
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ID: aiam1407OpenMr. Joseph P. O'Sullivan, Office of the Attorney General, State of Kansas, State Capitol Building, Topeka, KS 66612; Mr. Joseph P. O'Sullivan Office of the Attorney General State of Kansas State Capitol Building Topeka KS 66612; Dear Mr. O'Sullivan: This is in reply to your letter of January 30, 1974, concerning th application of the Federal odometer law to certain automobile (sic) operated by the Kansas State Department of Education. The cars in question are equipped with special odometers whose use normally requires the disconnection of the original equipment odometers.; The question posed by the Department of Education is whether thi practice violates the Federal law and whether the Department must keep the special odometer in the car when selling it. Our reply is that the Department is not violating the Federal law, and that while it must make certain disclosures when it sells the cars, it need not leave the special odometers installed.; Sections 404 and 405 of the Motor Vehicle Information and Cost Saving Act (15 U.S.C. 1981) (sic) make it unlawful for a person to disconnect an odometer with the intent to change the number of miles it indicates (section 404) and for a person with the intent to defraud to operate a vehicle with an inoperative odometer (section 405).; With respect to section 404, it does not appear that the Departmen will be changing the indicated mileage. With respect to section 405, it is apparent that the Department has no fraudulent intent in operating the vehicles with the standard odometers disconnected. We therefore find that the Department's practice does not violate the odometer law and may be continued.; We suggest that in executing the disclosure statement required b Section 408 of the Act, the Department should indicate that the indicated mileage is in error. Although section 408 does not require disclosure of the true mileage, we regard full disclosure to be in the public interest and therefore recommend that the Department also include the true mileage on the disclosure statement. By doing this, it will avoid any appearance of deceptive intent.; Yours truly, Richard B. Dyson, Assistant Chief Counsel |
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ID: aiam4605OpenMr. Garry O. McCabe 37 E. Cotton Hill Rd. New Hartford, CT 06057; Mr. Garry O. McCabe 37 E. Cotton Hill Rd. New Hartford CT 06057; "Dear Mr. McCabe: Earlier this year you wrote to the Federal Highwa Administration (FHWA) asking for information concerning your plans to field test a 'rapid fueling system' on an existing truck fleet. The FHWA has asked us to review your letter with regard to the regulations we administer. I expect that the FHWA will contact you directly with information concerning their regulations. By way of background, the National Highway Traffic Safety Administration (NHTSA) is authorized to issue Federal motor vehicle safety standards (FMVSS's) applying to the manufacture of new motor vehicles and items of motor vehicle equipment. NHTSA is not authorized to certify or approve motor vehicles or motor vehicle equipment for compliance with our FMVSS's. Instead, under the National Traffic and Motor Vehicle Safety Act (copy enclosed), each manufacturer of a motor vehicle or item of motor vehicle equipment is responsible for certifying that its products meet all applicable safety standards. (A general information sheet describing manufacturer's responsibilities under the Vehicle Safety Act is enclosed.) There is currently no FMVSS that is directly applicable to parts of the fuel system retrofitted to a used motor vehicle. FMVSS No. 301, Fuel System Integrity (copy enclosed), applies only to completed new motor vehicles. (The standard applies to trucks with a gross vehicle weight rating of 10,000 pounds or less.) If the rapid fueling system were installed as original equipment on new vehicles, the vehicle manufacturer would have to certify that the entire fuel system, with your product installed, satisfies the requirements of FMVSS No. 301. Also, if the item is added to a new motor vehicle prior to its first sale, the person who adds the system would be an alterer of a previously certified motor vehicle and would be required to certify that, as altered, the vehicle continues to comply with all of the safety standards affected by the alteration. If the rapid fueling system is installed on a used vehicle by a business such as a garage or repair shop, the installer would not be required to attach a certification label. However, the installer would have to make sure that he or she did not knowingly render inoperative the compliance of the vehicle with any safety standard, including Standard No. 301. This is required by /108(a)(2)(A) of the Vehicle Safety Act. The prohibition of /108(a)(2)(A) does not apply to individual vehicle owners who alter their own vehicles. Thus, under Federal law, they may install or remove any items of motor vehicle equipment regardless of its effect on compliance with Federal motor vehicle safety standards. However, the agency encourages vehicle owners not to remove or otherwise tamper with vehicle safety equipment if the modification would degrade the safety of the vehicle. Although Standard No. 301 would not directly apply to rapid fueling systems installed on used vehicles, you should be aware that manufacturers of motor vehicle equipment, which would include your product, are subject to the requirements in sections 151-159 of the Vehicle Safety Act concerning the recall and remedy of products with defects relating to motor vehicle safety. If you or NHTSA determines that a safety-related defect exists, you must notify purchasers of your product and remedy the problem free of charge. (Note that this responsibility is borne by the vehicle manufacturer in cases in which the system is installed on a new vehicle by or with the express authorization of that vehicle manufacturer.) Any manufacturer which fails to provide notification of or remedy for a defect may be subject to a civil penalty of up to $1,000 per violation. We suggest that you contact the Environmental Protection Agency to see whether the EPA has any type of emissions requirements that might affect the manufacture and installation of the rapid fueling system. The general telephone number for the EPA is (202) 382-2090. I hope this information is helpful. Please contact my office if you have further questions. Sincerely, Stephen P. Wood Acting Chief Counsel Enclosures"; |
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ID: aiam0646OpenMr. Gorou Utsunomiya, Chief, Liaison Engineer, Toyo Kogyo Detroit Office, 3841 Mystic Valley Dr., Bloomfield Hills, MI 48013; Mr. Gorou Utsunomiya Chief Liaison Engineer Toyo Kogyo Detroit Office 3841 Mystic Valley Dr. Bloomfield Hills MI 48013; Dear Mr. Utsunomiya: This is in response to your letter of March 16, 1972, in which you as whether the definition of 'unloaded vehicle weight' is the same as that for ''curb weight' plus optional parts,' and whether the definition of 'gross vehicle weight' is the same as that for 'maximum loaded vehicle weight.'; The two sets of definitions are expressed in substantially differen terms. The new terms, 'unloaded vehicle weight' and 'gross vehicle weight rating' are more general than the older ones. The newer terms also eliminate some ambiguities in the definitions based on 'curb weight,' such as just what is meant by 'standard equipment,' and whether other vehicle fluids besides fuel, oil, and coolant should be included. Further, GVWR is a rating, not necessarily identical to any scale weight although some constraints have been placed on it in our Certification regulations (S567.4(g)(3)).; Thus, although the two sets of definitions are somewhat similar i their application, they are different enough that each must be interpreted and used in its own terms.; Yours truly, Richard B. Dyson, Assistant Chief Counsel |
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ID: aiam1954OpenMr. John M. Whalen, Platz & Thompson, 183 Main Street, Lewiston, Maine 04240; Mr. John M. Whalen Platz & Thompson 183 Main Street Lewiston Maine 04240; Dear Mr. Whalen: This is in response to your letter of May 13, 1975 requesting information concerning standards that relate to the installation of campers on pick-up trucks and the modification of such pick-up trucks to accommodate the camper bodies.; With regard to camper manufacture, your client must meet th requirements of Standard No. 126, *Truck-camper loading*, if he manufactures slide-in campers. In addition, since your client in engaged in the modification of a pick-up trucks, he should be aware, not only of the certification and multistage vehicle manufacturing regulations (49 CFR Parts 566, 567, and 568), but of all safety standards that are applicable to that type of vehicle (39 CFR Part 571).; If the pick-up trucks on which your client installs the campers are ne (have not yet been sold for purposes other than resale), your client would have to comply with the safety standards and the certification regulations in altering the truck-camper for sale. If the pick-up trucks are used vehicles, Section 108 of the National Traffic and Motor Vehicle Safety Act as amended(Pub. L. 93-492) prohibits the rendering inoperative of any system installed in compliance with an applicable motor vehicle safety standard. For this reason, your client should be aware of the motor vehicle safety standards that apply to pick-up trucks.; I have enclosed a sheet entitled 'Where to Obtain Motor Vehicle Safet Standards and Regulations' which will direct you to the proper source for procuring copies of the relevant standards and regulations.; Sincerely, James C. Schultz, Chief Counsel |
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ID: aiam3969OpenHouston N. Tuel, Jr., Esq., Coder & Tuel, Suite 172, 8801 Folsom Boulevard, Sacramento, CA 95826; Houston N. Tuel Jr. Esq. Coder & Tuel Suite 172 8801 Folsom Boulevard Sacramento CA 95826; Dear Mr. Tuel: This responds to your letter of February 4, 1985, inquiring about th applicability of 49 CFR Part 566, *Manufacturer Identification*, and 49 CFR Part 573, *Defect and Noncompliance Reports*, to your client, Stockton Dodge. I regret the delay in our response.; You asked whether Stockton Dodge, as a vehicle alterer, would b considered a manufacturer under the statutory definition of 'manufacturer' in the National Traffic and Motor Vehicle Safety Act as amended, 15 U.S.C. 1391, *et seq.* (the Act). Based on the information given, the answer is yes.; You state that Stockton Dodge purchases previously certified Dodge van from Chrysler Corporation and converts them into school buses which are intended to be sold directly to school districts. The modifications made by your client include adding seats, strengthening the roof structure, and adding required warning lights and emergency equipment. You state that Stockton Dodge will certify the altered vehicles according to the requirements of 49 CFR Part 567.7, as complying with all Federal motor vehicle safety standards applicable to school buses.; Stockton Dodge sent a letter to the Administrator, dated March 7, 1985 stating that, beginning February 15, 1985, its school bus division would become a final-stage manufacturer. Stockton Dodge stated that they would purchase Dodge B350 vans from Chrysler Corporation which school bus options and would add equipment to alter these vehicles to Type 2 school buses, weighing under 10,000 GVWR. Under our regulations, your client is not considered a final-stage manufacturer because the definition of final-stage manufacturer in 49 CFR Part 568 applies to a person who finishes an incomplete vehicle.; This agency considers Stockton Dodge an alterer of previously certifie motor vehicles, as indicated in your letter, who must comply with the certification requirements of 49 CFR 567.7. Your client's alterations change the vehicle type from a multipurpose van to a school bus and affect components necessary for compliance with safety standards. For these reasons, Stockton Dodge is a manufacturer within the meaning of the Act, as stated above. Stockton Dodge's letter dated March 7, 1985, contains the information required to be submitted under 49 CFR Part 566, *Manufacturer Identification*. The agency will consider this letter as the manufacturer identification for Stockton Dodge as an alterer.; This agency has also determined that an alterer is considered manufacturer for the purposes of notification and recall for defects or noncompliance under the Act and is subject to the requirements of 49 CFR Part 573, *Defect and Noncompliance Reports*.; Please note that, under paragraph S4.1 of Standard No. 115, *Vehicl Identification Number--Basic Requirements* (VIN), Stockton Dodge, as the alterer, should use the VIN assigned by Chrysler Corporation, the original manufacturer of the vehicles.; If you have any further questions, please let me know. Sincerely, Jeffrey R. Miller, Chief Counsel |
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.