
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: 24099.ztvOpen Ms. Karen Benedix Dear Ms. Benedix: This is in reply to your letter of February 21, 2002, with reference to Federal stop lamp requirements. You have asked for specific requirements "for the number of brake lamps and also the amount of illumination required for each lamp" on passenger cars. Original and replacement equipment stop lamps must comply with Title 49, Code of Federal Regulations, Section 571.108 (Federal Motor Vehicle Safety Standard No. 108, Lamps, Reflective Devices, and Associated Equipment. Table III of Standard No. 108 requires a vehicle to be equipped with at least two stop lamps, one on each side of the vertical centerline, as far apart as practicable, and a center high-mounted stop lamp. The two lower-mounted stop lamps may be supplemented by additional stop lamps (which must be functionally and operationally similar to the required ones, and must not impair the effectiveness of the required stop lamps). The center high-mounted stop lamp must remain a single lamp and cannot be supplemented with an additional lamp. Table III requires that the lower-mounted stop lamps be designed to conform with SAE Standard J586 FEB84, which has been incorporated by reference into Standard No. 108 and contains photometric requirements for these lamps. Table III requires that the center high-mounted stop lamp be designed to conform with SAE Standard J186a, September 1977, except that the photometric requirements for the center lamp are those of Figure 10 of Standard No. 108. I hope that this answers your question. Sincerely, Jacqueline Glassman ref:108 |
2002 |
ID: 2409yOpen Mr. Larry F. Wort, Chief Dear Mr. Wort: This is in reply to your letter of March 27, l990, to Taylor Vinson of this Office with respect to Federal requirements for front side marker lamps on trucks. The Ford C-CT Series Cab is equipped with a reflex reflector (apparently mounted on the door, to judge by the Exhibit A that you enclosed), but does not have a separate front side marker lamp. Ford states that it uses "the roof mounted corner marker lamps to satisfy the side marker lamp requirements", and that they satisfy photometry and all other Federal requirements. You have asked whether "the top of the cab clearance light [may] be used to fulfill the requirements for front side market lights. . . on cab over engine vehicles." The answer is yes. Federal Motor Vehicle Safety Standard No. l08, Lamps, Reflective Devices, and Associated Equipment, does not prohibit combining the front side marker lamp with any other lamp, and prohibits a front clearance lamp only from being optically combined with a front identification lamp (section S5.4, formerly S4.4). Although, under Table II of Standard No. l08, Location of Required Equipment, a front side marker reflector may not be mounted higher than 60 inches from the road surface, there is no corresponding limitation on the mounting height of front side marker lamps, which would preclude it from being located on top of the cab. The marker lamp must be located "as far to the front as practicable", and the agency generally defers to the manufacturer's discretion in determining whether a location is practicable, unless it is clearly erroneous. Judging by the location of the combination clearance-side marker lamp shown in Exhibit A that you enclosed, we have no reason to question Ford's decision to locate the lamp there. I hope that this answers your question. Sincerely, Stephen P. Wood Acting Chief Counsel /ref: 108 d:4/25/90 |
1990 |
ID: 24100.ztvOpen Mr. Mac Yousry Dear Mr. Yousry: This is in reply to your e-mails of February 21 and 22, 2002, to Taylor Vinson of this Office. You referenced S5.1.1.18 of Federal Motor Vehicle Safety Standard No. 108, which states that a backup lamp is not required to meet minimum photometric values at each test point specified in Table 1 of SAE Standard J593c if the sum of the candlepower measured at the test points within each group listed in Figure 2 of Standard No. 108 is not less than the group totals specified in that figure. You have tested a backup lamp that exceeds the 300 cd maximum at test point H-V by 80 cd, but meets the group total requirements, and ask whether the lamp is acceptable. The answer is no. Tables I and III of Standard No. 108 require back up lamps to be designed to conform with SAE Standard J593c, which is incorporated by reference in Standard No. 108. Under the SAE Standard, when one or more back up lamps are used, the maximum intensity at any point in each lamp must not exceed 300 cd. The SAE standard establishes 22 discrete test points. Figure 2 of Standard No. 108 clusters these test points into six groups and totals the minimum photometric value of each test point in the group for a group total. If a manufacturer tests a back up lamp for photometric conformance and the lamp does not meet the minimum value specified at any one of the 22 test points, under S5.1.1.18, the lamp will pass the photometric test if the value measured at the failed test point, when added to the measured value of other test points in the group, results in a total that equals or exceeds the total required for the group as a whole. But Figure 2 in no way affects the limitation of 300 cd imposed by SAE Standard J593c. I hope that this answers your question. Sincerely, Jacqueline Glassman ref:108 |
2002 |
ID: 24101Open Ben Wood, Jr. Dear Mr. Wood: This is in response to your fax of February 12, 2002, in which you asked about the National Highway Traffic Safety Administration's (NHTSA) regulations governing vehicle identification numbers (VINs). In your fax, you stated that your company imports and sells four-wheel off-road vehicles. You also stated that although you have installed VINs on your off-road vehicles according to NHTSA's VIN requirements in 49 CFR Part 565, a State regulatory agency has determined that your VINs are in error because they do not comply with the State's regulations regarding VINs. You asked several questions concerning the role of NHTSA, the Consumer Product Safety Commission (CPSC), and the States in regulating VINs. The issues raised by your questions are addressed below. NHTSA is authorized by statute to regulate "motor vehicles." The term "motor vehicle" is defined as "a vehicle driven or drawn by mechanical power and manufactured primarily for use on the public streets, roads, and highways . . ." 49 U.S.C. 30102(a)(6). Accordingly, only vehicles that are operated on the public streets, roads, and highways, as one of their primary uses, are considered to be motor vehicles, and vehicles which are solely used "off-road" are excluded. Assuming that your vehicles are solely used off-road, our regulations, including those concerning VINs, do not apply to them. The CPSC does have jurisdiction over off-road vehicles. However, I regret that I cannot provide you with information about their regulations. For more information on the CPSC's regulations regarding off-road vehicles, you may contact Mark Ross of the CPSC at (301) 504-0580, extension 1188. The States may regulate the VINs of off-road vehicles. You may wish to contact the individual States and/or a private attorney about State regulation of VINs. If you have any questions regarding NHTSA's VIN requirements for motor vehicles, please feel free to contact Dion Casey of my staff at (202) 366-2992. Sincerely, Jacqueline Glassman ref:565 |
2002 |
ID: 2410yOpen Mr. Jerry W. Mooney Dear Mr. Mooney: This is in reply to your letter of March 29, 1990, with respect to your investigation of the importation of l7 M151A2 military jeeps from Canada. The jeeps were imported as "parts" rather than as vehicles, shipped intact inside containers "and covered with parts." You have asked three questions: 1. "We are of the understanding that a list does not exist naming certain vehicles as being noncomplying. If not, what is the procedure to determine if a vehicle complies to DOT standards?" Your understanding is correct; no list of nonconforming vehicles exists. No procedure per se exists to determine if a vehicle meets DOT standards. However, under the National Traffic and Motor Vehicle Safety Act, each motor vehicle must bear the permanently-affixed certification of its manufacturer that it complies with all Federal motor vehicle safety standards that applied to it on its date of manufacture. The presence of the certification label gives rise to the presumption that the vehicle meets DOT standards, and vehicles offered for importation bearing the certfication label are admitted into the United States as complying vehicles. 2. "We are of the understanding that the M151A2 does not comply to DOT standards. What makes it a noncomplying vehicle?" The M151A2 jeep was not certified as conforming to Federal standards. The lack of certification raises a presumption of nonconformance with all standards. Whether it did, in fact, meet some or all of those standards is a question to which we do not have the answer. 3. "Does the fact that the M151A2 was manufactured for DOD make it a noncomplying vehicle?" No. Under the regulations of this agency, no Federal motor vehicle safety standard applies to a vehicle manufactured for, and sold directly to, the Armed Forces of the United States, in compliance with contractual specifications. Although this relieves the manufacturer of the legal obligation of compliance, he may nevertheless choose to manufacture his vehicle in conformance with one or more standards. As I said in response to your second question, we have no knowledge as to the M151A2's state of compliance with any Federal motor vehicle safety standard. I hope that this is responsive to your questions. Although the importation of these vehicles appears to be a violation of the regulations of this agency (the failure to file a declaration), it is only a technical one, since no Federal motor vehicle safety standard applied to the jeeps at the time of their manufacture. Nevertheless, we are concerned about the safety implications of this importation. For many years, the Department of Defense, with the encouragement of this agency, has maintained the policy that all M151 vehicles must be scrapped at the end of their useful military life in a manner such that they cannot be reassembled for use on the public roads. Over the years, these vehicles have exhibited a tendency to roll over, even when operated by drivers specifically trained in their correct usage. Consequently, it has been deemed in the interests of safety to ensure that they will not be operated by untrained drivers on the public roads. While exportation of unscrapped M151s to Canada initially removed the threat to safety in the United States, their importation into this country renews that threat. Thus, we support your investigative efforts. We understand that, under Customs procedures, merchandise entered fraudulently may be redelivered for export, or seized by Customs. If the vehicles are seized, we recommend their export or destruction, rather than disposal by sale at auction or by use by Customs personnel in the performance of their duties. Sincerely,
Stephen P. Wood Acting Chief Counsel ref:Import d:4/25/90 |
1990 |
ID: 24115.rbmOpenMr. William Gest Dear Mr. Gest: This responds to your request for clarification of the responsibilities set forth in 49 CFR 595.7(e)(5) regarding certain disclosure requirements related to vehicle modifications made for a person with a disability. Among the requirements set forth in this section is a statement of the load carrying capacity of the vehicle if it has been reduced by more than 100 kilograms (220 pounds). You are specifically interested in determining whether the disclosure requirement applies to vehicle alterers, i.e., persons or companies that modify a vehicle prior to its first retail sale. The short answer to your question is that alterers do not have to specifically disclose a reduction in load carrying capacity that is the result of their alterations. They do, however, have to take adequate load carrying capacity into account when they determine whether the alterations have changed a vehicle's gross vehicle weight rating (GVWR). By way of background, the National Highway Traffic Safety Administration (NHTSA) administers a statute requiring that motor vehicles manufactured for sale in the United States or imported into the United States be manufactured so as to reduce the likelihood of motor vehicle crashes and of deaths and injuries when crashes do occur. We refer to that statute as the Vehicle Safety Act. It is codified at 49 U.S.C. 30101, et seq. One of the agencys functions under the Vehicle Safety Act is to issue and enforce Federal motor vehicle safety standards (FMVSSs). These standards specify safety performance requirements for motor vehicles and/or items of motor vehicle equipment. Manufacturers of motor vehicles must certify compliance with all applicable safety standards and permanently apply a label to each vehicle stating that the vehicle complies with all applicable FMVSSs and providing the GVWR. NHTSA's regulations impose certain requirements on those who alter a vehicle that has been previously certified by a manufacturer but not yet sold in good faith for purposes other than resale. Alterers are considered to be manufacturers and are responsible for ensuring that the vehicle continues to meet all applicable federal safety standards when delivered to the first retail customer. Alterers must determine whether their modifications could affect the vehicle manufacturer's certification of compliance and, if so, must apply a label adjacent to the original manufacturer's certification label stating that the vehicle, as altered, conforms with all applicable standards. Alterers must also determine whether their modifications affect the manufacturer's stated GVWR, gross axle weight rating (GAWR), and vehicle type. If such a change has been made, the alterer must specify the new GVWR, GAWR, or vehicle type in a manner consistent with the capability of the vehicle to comply with applicable standards and operate at higher weight rating and/or as a different type of vehicle. NHTSA expects both manufacturers and alterers to assign GVWR and GAWRs that reflect the manufacturer's or alterer's good-faith evaluation of how the vehicle's braking, load bearing items (including tires), suspension, steering, and drive train components will react to the vehicle's weight, size, cargo-carrying capacity and intended use. The term GVWR is defined in 49 CFR 571.3 as "the value specified by the manufacturer as the loaded weight of a single vehicle." The GVWR informs vehicle owners how heavily the vehicle may be safely loaded. It also affects the vehicle's loading and other test conditions for the performance tests to ascertain whether the vehicle complies with applicable safety standards. The only express regulatory limitation on the GVWR that manufacturers may assign to their vehicles is set forth in 49 CFR 567.4(g)(3), which provides that the assigned GVWR "shall not be less than the sum of the unloaded vehicle weight, rated cargo load, and 150 pounds times the vehicle's designated seating capacity." "Unloaded vehicle weight" is defined in 49 CFR 571.3 as "the weight of a vehicle with maximum capacity of all fluids necessary for operation of the vehicle, but without cargo, occupants, or accessories that are ordinarily removed from the vehicle when they are not in use." Although the term "rated cargo load" is not defined by regulation, generally it is the GVWR of the vehicle minus the combined weight of the occupied designated seating positions (150 pounds times the total number of designated seating positions) and the unloaded vehicle weight. Those who modify a completed vehicle after the first retail sale are considered to be repair businesses by NHTSA and are typically called "modifiers" by the industry. The Vehicle Safety Act prohibits manufacturers, distributors, dealers, or motor vehicle repair businesses from knowingly making inoperative any part of a device or element of design installed on or in a motor vehicle or motor vehicle equipment that is in compliance with any applicable federal motor vehicle safety standard. NHTSA may assess a civil penalty to enforce this provision. NHTSA may also, through regulation, exempt a person or business from the prohibition if it decides that an exemption is consistent with motor vehicle safety and the Vehicle Safety Act. On February 27, 2001, NHTSA published a final rule setting forth a limited exemption from the make inoperative prohibition for businesses or individuals who modify vehicles for persons with disabilities (66 Federal Register 12638; Docket No. NHTSA-01-8667). This exemption is codified in 49 CFR Part 595, subpart C. Only portions of some Federal motor vehicle safety standards are covered by the exemption. An underlying premise of Part 595 is that the individual for whom the modifications were made is unlikely to realize that the vehicle, as modified, may no longer meet all applicable FMVSS and may have a different load carrying capacity than listed in the owner's manual or on a tire placard. These vehicle changes could have an effect on the overall performance of the vehicle. Accordingly, we determined that vehicle modifiers who decide to take advantage of the exemption set forth in 49 CFR Part 595 should be required to provide the customer with certain safety information and place a permanent label on the vehicle. The language for the label is set out in 49 CFR 595.7(d), and a detailed breakdown of the required information is contained in 49 CFR 595.7(e). One of the required pieces of information is the vehicle's load carrying capacity when it has been reduced by 100 kilograms (220 pounds) or more. This requirement was intended to address circumstances in which the load carrying capacity has been reduced as a result of the modification. Although the term "load carrying capacity" was not specifically defined in the February 2001 final rule, the term was intended to convey the same meaning as vehicle capacity weight, as defined in FMVSS No. 110, Tire selection and rims. "Vehicle capacity weight" is defined in that standard as the rated cargo and luggage load plus 68 kilograms (150 pounds) times the vehicle's designated seating capacity, i.e, the number of designated seating positions. The vehicle capacity weight for passenger cars is stated on a placard located on the glove compartment door or an equally accessible location. For other vehicles, such as vans, vehicle capacity weight and/or rated cargo load and luggage values may be stated on a label voluntarily affixed by the vehicle manufacturer or alterer or in the owner's manual. If no information is provided, a vehicle's load carrying capacity prior to modification is its GVWR minus its unloaded weight. Likewise, the term "available load capacity" means that load carrying capacity that remains after the modifications are completed. For a comprehensive discussion regarding the determination of "reduction in load carrying capacity," see the enclosed letters to Mark S. Lore and Kenneth Conaway, dated April 25, 2002. Should you require any additional information or assistance, please contact Rebecca MacPherson, of my staff, (202) 366-2992 or at the address given above.
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2002 |
ID: 2411yOpen Mr. Charles M.A. Saedt Dear Mr. Saedt: This is in reply to your letter of April 8, l990, with respect to your intended exportation of a Volkswagen manufactured to conform to European specifications. You are a member of the Dutch armed forces, and you will be in the United States until June 1991. You understand that you will need to get an exemption when you import the car into the United States. As Taylor Vinson of this Office explained to you on April 10, at the port of entry you will be required to execute a Form HS-7, a declaration form covering the importation of your car into the United States. It appears that you are eligible to mark Box 12, and to import the vehicle under the declaration that you are a member of the armed forces of a foreign country on assignment in the United States. You must attach a copy of your official orders to this form. When this is done, there should be no problem in importing your car. You also represent by marking Box 12 that you are importing the vehicle for your own personal use and on a temporary basis, that you will not sell the vehicle to any person in the United States, and that you will export the vehicle upon departing the United States at the conclusion of your tour of duty. Sincerely, Stephen P. Wood Acting Chief Counsel ref:59l d:4/25/90 |
1990 |
ID: 2412yOpen Mr. Charles M.A. Saedt Dear Mr. Saedt: This is in reply to your letter of April 8, l990, with respect to your intended exportation of a Volkswagen manufactured to conform to European specifications. You are a member of the Dutch armed forces, and you will be in the United States until June 1991. You understand that you will need to get an exemption when you import the car into the United States. As Taylor Vinson of this Office explained to you on April 10, at the port of entry you will be required to execute a Form HS-7, a declaration form covering the importation of your car into the United States. It appears that you are eligible to mark Box 12, and to import the vehicle under the declaration that you are a member of the armed forces of a foreign country on assignment in the United States. You must attach a copy of your official orders to this form. When this is done, there should be no problem in importing your car. You also represent by marking Box 12 that you are importing the vehicle for your own personal use and on a temporary basis, that you will not sell the vehicle to any person in the United States, and that you will export the vehicle upon departing the United States at the conclusion of your tour of duty. Sincerely, Stephen P. Wood Acting Chief Counsel ref:59l d:4/25/90 |
1990 |
ID: 2413yOpen Mr. Anthony T. Greenish Dear Mr. Greenish: Your letter of February 19, 1990, to the Department has been referred to this Office for reply. You are contemplating buying a car in Europe and importing it when you return to the United States in July. You have in mind the BMW 324d and the Honda Accord 1.6 LX, and ask for information "as to how these cars rate as to motor vehicle safety standards." BMW does not offer the 324d for sale in the United States, and we assume that the Honda you mentioned was also produced for the European market. This means that these vehicles are not certified as complying with all applicable Federal motor vehicle safety, bumper, and theft prevention standards. Because of the difficulties you would entail in attempting to import an uncertified vehicle, we recommend that you purchase a vehicle certified by its original manufacturer for the American market. As you know, many European manufacturers have a factory delivery program for U.S. tourists. That way you can ensure that your car meets 100% of Federal requirements. If you nevertheless wish to pursue the idea of buying and importing a passenger car not certified by its original manufacturer to meet the Federal motor vehicle safety standards, you should be aware of some recent changes in law. Because of new regulations which were mandated by Congress and became effective January 31, l990, such a vehicle may not be imported unless the National Highway Traffic Safety Administration has determined that that specific model and model year is capable of conversion to meet the standards. Importation of the vehicle is also subject to the requirement that it be imported either by a person who has been approved by this agency as a Registered Importer and will be responsible for converting the vehicle to meet the standards, or by a person who has a contract with a Registered Importer. In either instance, a bond in an amount equal to l50% of the entered value of the vehicle as determined by the U.S. Customs Service must be given to ensure performance of the conversion work. We anticipate that the effect of these stringent regulations will be to convince many prospective importers not to buy vehicles intended for markets other than the United States. Sincerely, Stephen P. Wood Acting Chief Counsel ref:59l d:4/25/90 |
1990 |
ID: 2414yOpen Ms Margaret Schmock Dear Ms Schmock: This is in reply to your FAX of March 6, l990, with respect to the relationship between Federal Motor Vehicle Safety Standard No. l08, and "CAC Title 13, Article 9". You have indicated that CAC requires a headlamp adjustment range in the horizontal of at least +/- 4 degrees, whereas Standard No. l08 requires a horizontal adjustment range of not less than 2.5 degrees. You have asked whether Bosch headlamps still must have an adjustment range of +/-4 degrees in the horizontal although Standard No. l08 has been changed. We understand that "CAC" refers to "California Administrative Code". The effect of the preemption provisions of the National Traffic and Motor Vehicle Safety Act is to prohibit California from adopting and enforcing a minimum horizontal headlamp adjustment range greater or less than 2.5 degrees. Thus, a State requirement that a headlamp have a horizontal range of +/- 4 degrees is invalid because it differs from a corresponding Federal requirement. We are unable to answer your further questions with respect to the California code, and suggest that, for further information you write Department of Motor Vehicles, State of California, 2415 First Avenue, Sacramento, California 95818, ATTN: Mr. A. A. Pierce, Director (FAX 916-732-7854). Sincerely, Stephen P. Wood Acting Chief Counsel ref:l08 d:4/25/90 |
1990 |
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.