
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: 13439.drnOpen Mr. Donald E. Moore Dear Mr. Moore: This responds to your request for an interpretation whether a truck's "vernier hand throttle" (VHT) that is not used in driving the vehicle, must meet the "hand operated control" requirements of Standard No. 101 Controls and displays. As explained below, the answer is no. In your letter, you stated that the VHT is used in trucks to power vocational applications, such as dump trucks or cement mixers that power a hydraulic pump, providing energy to a hydraulic motor or ram. The VHT is used only when the vehicle is stationary or moving at a very low speed. You further wrote that the people using the VHT are usually professionals, who perform these tasks daily. You further wrote that the VHT is placed under the steering column. When in the normal seated position, the driver cannot see the VHT, but can operate it with difficulty. You explained that in its location, the VHT can be operated either from the ground where the operator can easily monitor the auxiliary equipment powered by the VHT, or from the driver's seat. The VHT is placed out of the way of the driver's knees, where it may interfere with driving controls. Your letter concluded that if NHTSA determines the VHT to be a "hand throttle" as defined in Standard No. 101, your company would have difficulty meeting Standard No. 101 by placing a label in a meaningful location where the driver can both see the label, and have the label be adjacent to the VHT. You further stated your belief that identifying the VHT as a "throttle" may imply that the VHT is meant to regulate road speed while driving, which the VHT does not do. Standard No. 101's purpose, stated at S2, makes clear the Standard is intended to apply to controls and displays used in the driving task: The purpose of the standard is to ensure the accessibility and visibility of motor vehicle controls and displays and to facilitate their selection under daylight and nighttime conditions, in order to reduce the safety hazards caused by the diversion of the driver's attention from the driving task, and by mistakes in selecting controls. You have explained how the VHT, although called a "throttle," is not the same as a throttle used to regulate road speed while driving. Since it is not a control used in the driving task, and is not a "hand throttle" specified in S5.1 Location, the VHT need not meet Standard No. 101. I hope this information is helpful. If you have any other questions, please contact Dorothy Nakama of my staff at this address or by telephone at (202) 366-2992. Sincerely, John Womack ref:101 |
1997 |
ID: 13441.ztvOpen Mr. Kevin Imagawa Dear Mr. Imagawa: This letter replies to your letter of December 20, 1996, to Bob Shelton of this agency, as supplemented by your letters of January 9 and January 14, 1997, to this Office. You describe the subject of your letters as a "battery-operated DC-motor-driven bicycle." You have told us that you plan to market this machine and asked whether "49 USC Chapter 301 (Motor Vehicle Safety) and 49 CFR Parts 390 & 571 are applicable to this kind of product or not." You tentatively concluded "that only CPSC has the mandatory safety requirements for a bicycle. . . ." If we understand your letters correctly, the battery provides the same amount of torque as the torque provided by a rider pedaling the bicycle up to a speed of 14.9 mph, at which point the motor cuts off and 100% of the torque is provided by the driver. The motor also shuts off whenever the driver stops pedaling. First, the regulations at 49 CFR Part 390 are those of the Federal Highway Administration (FHWA). The FHWA only regulates motor vehicles that are used for commercial purposes in interstate commerce. Your vehicle would not be operated in interstate commercial ventures and these regulations would not apply to you. A "motor vehicle" as defined under 49 USC Chapter 301 is one that is "driven or drawn by mechanical power . . . ." With respect to your design, the vehicle would be driven primarily by muscular power, with a mechanical assist. At no point does the motor alone drive the bicycle. It assists the prime mover, muscular power, and does not drive the bicycle in the absence of muscular power. We have therefore concluded that your bicycle design with power assist is not a motor vehicle as defined by 49 U.S.C. Chapter 301 and is not subject to it or to 49 CFR Part 571. I enclose a letter of February 16, 1993, to Mr. J.C. Townley, which explains our views in somewhat greater detail. You also asked whether "a driver's license is required by law when a bicycle is provided with a continuous (without pedaling) motive power exceeding a certain speed limit (Ex. 14.9 mph) or of more than 5 horse power." I am sorry that we cannot answer this question for you. Each State has its own requirements for licensing the operation of motor vehicles within its borders. We are unable to advise on the laws of the States, and suggest that you contact the Department of Motor Vehicles in each State where you intend to market your product. If you have any further questions, you may call Taylor Vinson of this Office (202-366-5263). Sincerely, John Womack Acting Chief Counsel Enclosure ref:571 d:5/2/97 |
1997 |
ID: 13472-2.pjaOpen Mr. Garry Bowhall Dear Mr. Bowhall: This responds to your letter asking whether your belted-bottom trailers are "special purpose vehicles" under Federal Motor Vehicle Safety Standard No. 224, Rear Impact Protection. I apologize for the delay in responding. The answer to your question is no. After January 1998, Standard 224 will require most trailers and semitrailers weighing over 10,000 pounds to be fitted at the rear with an underride guard. Excluded from Standard 224 are "special purpose vehicles." A special purpose vehicle is defined in S4 of the standard as "a trailer or semitrailer having work-performing equipment . . . that, while the vehicle is in transit, resides in or moves through the area that could be occupied by the horizontal member of the rear underride guard . . . ." (Emphasis added.) Your letter and its enclosed brochures and video explain that you manufacture trailers that discharge their contents by means of a moving belt on the trailer floor that pushes the contents to the rear of the trailer. Your underride guards are currently located 24 inches forward of the vehicle's rear extremity, and you believe that having to locate the guard 12 inches closer to the rear extremity, as will be required by Standard 224, would render your vehicles unusable. Your vehicle does not meet the definition of a special purpose vehicle. The "special purpose vehicle" exclusion does not apply merely because the vehicle has a "special purpose." The exclusion involves the relationship of work-performing equipment to the guard. The conveyor belt on your vehicles at no time passes through the area where the horizontal member of the underride guard would be located. Moreover, even if it did pass through, it would have to do so while the vehicle is in transit. Because your vehicles do not meet the definition of "special purpose vehicles," they are not excluded from Standard 224. Under one of our regulations (49 CFR Part 555), vehicle manufacturers may apply for a temporary exemption from the Federal motor vehicle safety standards. Under Sec. 555.6(a), a manufacturer whose yearly production is not more than 10,000 units may ask for an exemption of up to three years on the basis that compliance would cause it substantial economic hardship and that it has attempted in good faith to comply with the standard from which it has asked to be excused. I have enclosed a copy of Part 555 for your information. Please note that it takes three to four months from the date of submittal before a decision can be made on such an application because it has to be submitted for public comment. If you need further assistance, you may contact Mr. Atelsek of my staff at (202) 366-2992. Sincerely, |
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ID: 13494.ztvOpen Mr. Dion A. DeVan Dear Mr DeVan: This is in reply to your e-mail of January 2, 1997, to this Office. You informed us that you are building a "one-of-a-kind" truck/van, and need information such as how you can get a copy of the National Highway Traffic Safety Administration's "codes," whether you need a manufacturer's license, and how you "go about getting certification for GVWR, Safety, and Emissions?" Under our primary safety statute, 49 U.S.C. Chapter 301, Motor Vehicle Safety, "manufacturer" means any person manufacturing or assembling motor vehicles . Even if someone produces only a single motor vehicle, that vehicle must be certified to conform to all applicable Federal motor vehicle safety standards if its producer intends it to operate on the public roads. The Federal motor vehicle safety standards are found at Title 49 Code of Federal Regulations Part 571. As we are unsure of the final configuration of your "truck/van," you should review the definitions of "truck" and "multipurpose passenger vehicle" under Sec. 571.3(b) to see which is most appropriate to your vehicle. The application section near the beginning of each Federal safety standard will tell you whether that standard applies to multipurpose passenger vehicles and trucks. I enclose an information sheet that will tell you how you may get a copy of Title 49. No Federal license is required to manufacture a vehicle or vehicles, though a manufacturer of vehicles must file a simple identification statement with the agency. Manufacturers must certify compliance of their vehicles with the Federal safety standards on the basis of their own engineering judgment and test data. Certification is achieved through affixing a plaque permanently to the vehicle (49 C.F.R. Part 567), which contains the vehicle's GVWR. The Environmental Protection Agency enforces Federal emissions regulations, and we are unable to advise you as to their applicability to your truck/van. We appreciate your interest in the Federal motor vehicle programs. If you have any further questions, you may call Taylor Vinson of this Office at 202-366-5263. Because of the public interest in our interpretations and our desire to make them available to all interested persons, it is not our policy to reply by e-mail to requests for interpretations. Sincerely, |
1997 |
ID: 13523.drnOpen Mr. Jerome A. Hoover Dear Mr. Hoover: This responds to your request for an interpretation whether a world manufacturer identifier (WMI) assigned to Roadmaster Rail, Inc. (Roadmaster) can continue to identify Roadmaster after Monaco Coach Corporation (Monaco) purchases Roadmaster. Under the facts described below, since Monaco is not assigned a WMI and intends to continue use of the Roadmaster name, Monaco may use Roadmaster's WMI. Your letter states Roadmaster and Holiday Rambler are divisions of Monaco. Roadmaster manufactures incomplete vehicles, and Holiday Rambler and Monaco are final stage vehicle manufacturers. You wrote that "Monaco has full liability for the Roadmaster chassis, and for Monaco and Holiday Rambler motorhomes." In a telephone conversation with Dorothy Nakama of my staff, you explained that Monaco does not manufacture any vehicles in one stage or any incomplete vehicles, and is not assigned a WMI. You stated that before Monaco acquired Roadmaster in 1993, Roadmaster was an independent company, not part of another company. You stated that Monaco does not intend to merge Roadmaster into Monaco but to keep Roadmaster as a separate division, and to advertise Roadmaster as a trade name. You also stated that Holiday Rambler was once an independent company and is assigned its own WMI because it manufacturers trailers and fifth wheels. NHTSA's regulations at 49 CFR Part 565 Vehicle Identification Number Requirements states that the WMI shall "uniquely identify the manufacturer, make and type of the motor vehicle if its manufacturer produces 500 or more motor vehicles of its type annually." (49 CFR section 565.6(a)) In past interpretation letters, NHTSA has interpreted "uniquely identify" to mean that the same WMI cannot be used for two corporate entities if there is a possibility the two entities will be confused. Your case is one of first impression. Unlike similar situations we have addressed, no WMI is assigned to the parent company (Monaco), but each division (Roadmaster and Holiday Rambler) has a separate WMI. You assure us that there are no plans for Monaco to be a one stage vehicle manufacturer or an incomplete vehicle manufacturer (which would require assigning a WMI). Since Monaco itself is not assigned a WMI, and but each of its divisions, Roadmaster and Holiday Rambler has separate WMIs, we agree that Roadmaster and Holiday Rambler may continue to use the WMI assigned to each company. Under the facts described, there would be no confusion as to which corporate entity manufactured the applicable vehicle. Also, separate WMIs for the two divisions make it possible to distinguish between vehicles built by Roadmaster and Holiday Rambler. I hope this information is helpful. If you have any further questions, please contact Dorothy Nakama of my staff at this address or at (202) 366-2992. Sincerely, John Womack Acting Chief Counsel ref:565 3/20/97 |
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ID: 13562.drnOpen Mr. William J. Gordon Dear Mr. Gordon: This responds to your request for an interpretation of how The National Highway Traffic Safety Administrations (NHTSA's) laws apply to a device you wish to manufacture. In a March 12, 1997 letter from Heidi Coleman, NHTSA's Assistant Chief Counsel for General Law, your letter to NHTSA was granted confidential treatment of all information, except for the device's description as a "speed limiting device for passenger automobiles and light trucks." A discussion of our standards follows below. By way of background, NHTSA is authorized to issue safety standards for new motor vehicles and new items of motor vehicle equipment. This agency does not approve motor vehicles or motor vehicle equipment. Instead, manufacturers are required to certify that their vehicles and equipment meet applicable standards. Also, it is unlawful for dealers to sell motor vehicles or motor vehicle equipment that do not meet applicable standards. Vehicle manufacturers wishing to install your device would be required to certify that their vehicles meet all applicable safety standards with the device installed. While we do not have sufficient information to identify all the standards that might be relevant to your device, I would like to bring two standards to your attention. Among the safety standards your device may affect are those for accelerator control systems (Standard No. 124, Accelerator control systems), and braking (Standard No. 135, Passenger car brake systems), (The safety standards are found in Title 49 of the Code of Federal Regulations, Part 571.) Standard No. 124 establishes requirements for the return of a vehicle's throttle to the idle position when the driver removes the actuating force from the accelerator control, or in the event of a severance or disconnection in the accelerator control system. Standard No. 135 specifies requirements for service brake and associated parking brake systems. While these standards do not preclude the installation of your device on a new vehicle, any vehicle with your device must meet the requirements of these and all other applicable safety standards. No standard would apply to your device to the extent that it is sold as aftermarket equipment. However, Federal law prohibits a manufacturer, distributor, dealer, or motor vehicle repair business from "making inoperative" a vehicle's compliance with any safety standard. Therefore, your device could not be installed by such businesses if the installation adversely affected a vehicle's compliance with any safety standard. The "make inoperative" provision does not apply to modifications made by owners to their own vehicles. However, NHTSA encourages vehicle owners not to degrade the safety of their vehicles. Also, individual states have authority to regulate modifications that a vehicle owner may make to his or her vehicle. We are not able to provide you with information on state laws. You may wish to seek an opinion from the Department of Motor Vehicles in any state in which the device will be sold or used. Finally, your device is considered to be "motor vehicle equipment" under Federal law. This means that the manufacturer of the device would be subject to Title 49 of the U.S. Code, sections 30118-30122, concerning the recall and remedy of products with defects related to motor vehicle safety. If the manufacturer or NHTSA determined that the product contains a safety related defect, the manufacturer would be responsible for notifying purchasers of the defective equipment and remedying the problem free of charge. (This responsibility is borne by the vehicle manufacturer in cases in which your device is installed on a new vehicle by the vehicle manufacturer.) I hope this information is helpful. I am enclosing a general information sheet for new manufacturers which summarizes NHTSA's regulations and explains where to obtain copies of Federal motor vehicle safety standards and other regulations. If you have any more questions about these issues, please feel free to contact Dorothy Nakama at this address or by telephone at (202) 366-2992. Sincerely, John Womack Acting Chief Counsel Enclosure ref:vsa d:3/26/97 |
1997 |
ID: 135cmcOpenMr. David Spurgess Dear Mr. Spurgess: This responds to your letter requesting an interpretation of S7.8 of Federal Motor Vehicle Safety Standard (FMVSS) No. 135.You requested the Agencys concurrence with, or guidance regarding a suggested interpretation.You suggest that S7.8 is intended to require the testing of only a single antilock brake system (ABS) inoperative condition and that it is up to the discretion of the representative conducting the test to ensure that this has been accomplished appropriately.The issues raised by your letter are discussed below. FMVSS No. 135 specifies requirements for service brake and associated parking brake systems for vehicles with a gross vehicle weight rating of 7716 pounds or less.The purpose of the standard is to ensure safe braking performance under normal and emergency driving conditions.Included in FMVSS No. 135 is S7.8, Antilock functional failure, which is part of a series of individual system functional failure tests.The series also includes: S7.7, Stops with engine off; S7.9 Variable brake proportioning system functional failure; S7.10, hydraulic circuit failure; and S7.11, Brake power unit or brake power assist unit inoperative. S7.8 is a performance test conducted with an ABS functional failure simulation.In order to simulate a functional failure S7.8.2(g)(1) includes the following test specification: "Disconnect the functional power source, or any other electrical connector that creates a functional failure." In your letter you state: If a complex electrical control system is the basis for the ABS, it is feasible . . . that there are more then [sic] one electrical inputs into the module that may or may not directly apply to the performance of the ABS. You state further: [T]he purpose of S7.8 is to provide a performance requirement for a single condition of ABS inoperative. . . . [I]t is up to the discretion of the representative conducting the test to ensure that the selection [of which electric connector to disconnect] has been accomplished appropriately to ensure that only the ABS has been disabled and tested. You are correct that S7.8 of FMVSS No. 135 is intended to be performed with a single function failure in the ABS only.In fact, each individual system functional failure test referenced above is intended to verify only the performance of the single failure type to which it directly applies.In the final rule establishing FMVSS No. 135 (60 FR 6411) the Agency clarified that in the antilock functional failure performance test only a single ABS failure is covered.Under S7.8, if the Agency were to test a complex system, such as your letter describes, the Agency would simulate ABS functional failure by disconnecting any electrical connector that creates only an ABS functional failure.The Agency may contact the manufacturer for assistance in determining how to perform this failure and for a procedure that does not impact or has limited impact on other systems. However, when FMVSS No. 135 was established, the Agency recognized the increasing integration of ABS into the service brake system.The Agency noted "if a functional failure of the ABS also affects or degrades the service brake system, no artificial means are [employed] to keep the service brake system intact when that failure is introduced." Therefore, if the electric control system for the ABS is designed such that an ABS failure cannot be isolated and simulated under S7.8 without also affecting some other braking function, then the antilock functional failure requirements must be met with both the ABS failure and the additional braking function failure. I hope you find this information helpful.If you have any further questions please contact Chris Calamita of my office at this address or by phone at (202) 366-2992. Sincerely, Jacqueline Glassman ref:135 |
2002 |
ID: 13622.ztvOpen The Honorable David L. Hobson Attention: Bob Clark Dear Mr. Hobson: This responds to your letter of December 20, 1996, to Ms. Carmen Rivers-Glagola of the Department, on behalf of your constituent, Stephen Reeves of Chillicothe. According to Mr. Reeves' letter to you dated December 12, he seeks "waivers or a change in the law for vehicle length." None of the Federal motor vehicle safety standards, laws, or other regulations of this agency establish limits on the length of a motor vehicle. Federal Highway Administration regulations impose certain length limits on combination vehicles with two or more cargo-carrying units (see 49 CFR 658.23 and Appendix C to Part 658). Most of the states also enforce overall length limits on straight trucks, but we are not conversant with state laws and therefore cannot advise you on this point. We suggest that Mr. Reeves contact the Ohio Department of Motor Vehicles in Columbus to see whether your state has or knows of restrictions of this nature. It should be noted, however, that Mr. Reeves' unwillingness to be specific about the vehicle in question makes it difficult to answer his question precisely. If Mr. Reeves has been misinformed about our regulations, we would be pleased to try to clarify the matter for him. He may telephone Taylor Vinson of the Office of Chief Counsel at (202) 366-5263. Sincerely, John Womack Acting Chief Counsel ref:571 d:4/14/97 |
1997 |
ID: 13705cos.coOpen Mr. Terry Emerson Dear Mr. Emerson: This responds to your December 6, 1996 letter asking for confirmation that S5.2.3.2 of Standard 213, "Child Restraint Systems," does not apply to booster seats. Your question relates to a petition for exemption for inconsequential noncompliance that Cosco submitted in July 1996 with the understanding, which you now believe to be incorrect, that S5.2.3.2 applies to those seats. Because you now believe S5.2.3.2 does not apply, you believe there is no noncompliance at issue and wish to withdraw the petition. You are correct that the booster seats are not subject to S5.2.3.2. S5.2.3.2, which requires that surfaces contacting a dummy's head must be covered with energy absorbing foam, applies by way of S5.2.3.1 to child restraint systems (other than child harnesses) that are recommended for children whose masses are less than 10 kg (weighing less than 22 lb). Those restraints are infant-only and convertible restraints. You state that the booster seats in question are recommended for children whose masses are from 13.6 kg to 27 kg (weighing 30 to 60 lb).(1) Given that recommended range for the boosters, S5.2.3.2 does not apply. We consider your petition to be withdrawn, as you request, and will take appropriate steps to close the action. If you have any questions, please contact Deirdre Fujita of my staff at (202) 366-2992. Sincerely, John Womack ref:213 1. This accords with S5.5.2(f) of Standard 213, which prohibits booster seats from being recommended for children whose masses are less than 13.6 kg. |
1997 |
ID: 13720.mlsOpen Mr. Gunnar Almen Dear Mr. Almen: This responds to your request for an interpretation of Federal Motor Vehicle Safety Standard (FMVSS) No. 105, Hydraulic Brake Systems (49 CFR 571.105). You stated that as the national testing agency for vehicles imported into Sweden, you need to know U.S. regulations for asbestos free brake linings. By way of background information, the National Highway Traffic Safety Administration (NHTSA) is authorized under Title 49, Chapter 301 of the U.S. Code to issue FMVSSs that set performance requirements for new motor vehicles and new items of motor vehicle equipment. NHTSA does not approve or certify any vehicles or items of equipment, as is the practice in Europe. Instead, Chapter 301 establishes a "self-certification" process under which each manufacturer is responsible for certifying that its products meet all applicable safety standards. The agency has used this authority to issue FMVSS No. 105, which specifies requirements for hydraulic service brake and associated parking brake systems. This Standard does not contain any provision requiring or prohibiting asbestos free brake linings. While most brake linings are asbestos free, some brake linings sold in the aftermarket have asbestos. Please note that the United States Environmental Protection Agency (EPA) has issued rules prohibiting the use of asbestos brakes. We have forwarded your letter to Mr. Mike Matthiesen, Chemical Management Division, Office of Pollution Prevention and Toxics, EPA, 401 M Street, SW, Washington DC 20460. He should be able to explain how EPA's rules apply to asbestos brakes. I hope you find this information helpful. If you have any other questions, please contact Marvin Shaw of my staff at this address or by phone at (202) 366-2992. Sincerely,
Chemical Management Division Office of Pollution Prevention and Toxics, EPA, 401 M Street, SW, Washington DC 20460 ref:105 |
1997 |
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.