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 |
|---|---|
ID: 7980Open Mr. Richard Horian Dear Mr. Horian: This responds to your two letters of November 6, 1992, with respect to the allowability under Federal regulations of the "Sudden Brake Indicator Hazard Light." As you describe it, "when a driver engages in hard braking, a circuit activates a separate lighting system to warn other drivers to pay special attention to a potentially hazardous situation." This system will not utilize any of the existing rear lights on a vehicle, and will consist of a single lamp or pair of lamps, either mounted separately, or in the same housing as the center high-mounted stop lamp. The system will be red or amber in color, and either steady burning or flashing. The system is activated only when a predetermined threshold of pressure is reached upon depression of the brake pedal. Supplementary lighting systems such as the one you have described are permissible as original motor vehicle equipment under Federal Motor Vehicle Safety Standard No. 108 Lamps, Reflective Devices, and Associated Equipment if they do not impair the effectiveness of the lighting systems required by the standard, or if there is no provision of the standard that affects them. Paragraph S5.4 of Standard No. 108 specifically prohibits the physical combination of the center highmounted stop lamp with any other lamp or reflective device, thus your system could not be used in a common housing with the center light (see copy of enclosed letter to Mr. S. Suzuki on this subject). However, if the system is mounted separately, under the circumstances you have presented, we do not believe that there would be any direct impairment of the required rear lights, or indirect impairment such as might be created when confusion may result upon simultaneous operation of the supplementary light and any required light. As the letter to Mr. Suzuki indicates, passenger cars manufactured before September 1, 1985, were not required to be equipped with the center lamp. This means that your light could be combined in the same housing as a center lamp intended for installation on vehicles manufactured before September 1, 1985, but it could not be part of a replacement center lamp intended for use on vehicles manufactured subsequently. In addition, with the exception just noted, installation of the system on a vehicle in use would not appear to affect the safety functioning of any safety system necessary for continued conformance of the vehicle, it would appear that your system is acceptable for sale and installation in the aftermarket as well. However, the individual States have the authority to regulate lamps for vehicles in use, and we suggest that you contact the American Association of Motor Vehicle Administrators (AAMVA) for an opinion as to whether the system is permissible under State laws. AAMVA's address is 4600 Wilson Boulevard, Arlington, Va. 22203. Sincerely,
Paul Jackson Rice Chief Counsel Enclosusre ref:108 d.12/7/92 |
1992 |
ID: 7981-2Open Emmett Koelsch Coaches Dear Sir/Madam: Your letter of November 5, 1992 addressed to the Department of Transportation Publications Department was forwarded to this office for response. In your letter you requested a copy of the Federal motor vehicle safety standards pertaining to school buses "and other Transit type vehicles." The Federal motor vehicle safety standards issued by this agency, the National Highway Traffic Safety Administration (NHTSA), apply to all classes and categories of motor vehicles, including passenger cars, trucks, buses of all types including school buses, multipurpose passenger vehicles, and the like. Excluded from the definition of motor vehicles are such vehicles as farm tractors, earth-moving equipment, and other off-road vehicles. For your information, I am enclosing a pamphlet issued by this agency entitled Federal Motor Vehicle Safety Standards and Regulations, which summarizes our safety standards. Also enclosed are copies of two fact sheets issued by this office entitled Information for New Manufacturers of Motor Vehicles and Motor Vehicle Equipment and Where to Obtain NHTSA's Safety Standards and Regulations. You did not elaborate on what was meant by "Transit type vehicles." If you were referring to intercity buses, you should contact the Office of Motor Carrier Standards, Federal Highway Administration, Room 3404, this address for information on their pertinent standards and regulations. For information on intracity buses, you should contact the Federal Transit Administration, Room 9328, this address. Finally, for information regarding implementation of the Americans with Disabilities Act, you should contact the Office of Technical and Information Services, U.S. Architectural and Transportation Barriers Compliance Board, 1331 F Street N.W., Suite 1000, Washington, DC 20004-1111. I hope this information is helpful. If after examining this material you have more specific questions, please feel free to contact Mr. Walter Myers of my staff at this address or by telephone at (202) 366-2992. Sincerely,
Paul Jackson Rice Chief Counsel Enclosures ref:571 d.12/10/92 |
1992 |
ID: 7981Open Emmett Koelsch Coaches Dear Sir/Madam: Your letter of November 5, 1992 addressed to the Department of Transportation Publications Department was forwarded to this office for response. In your letter you requested a copy of the Federal motor vehicle safety standards pertaining to school buses "and other Transit type vehicles." The Federal motor vehicle safety standards issued by this agency, the National Highway Traffic Safety Administration (NHTSA), apply to all classes and categories of motor vehicles, including passenger cars, trucks, buses of all types including school buses, multipurpose passenger vehicles, and the like. Excluded from the definition of motor vehicles are such vehicles as farm tractors, earth-moving equipment, and other off-road vehicles. For your information, I am enclosing a pamphlet issued by this agency entitled Federal Motor Vehicle Safety Standards and Regulations, which summarizes our safety standards. Also enclosed are copies of two fact sheets issued by this office entitled Information for New Manufacturers of Motor Vehicles and Motor Vehicle Equipment and Where to Obtain NHTSA's Safety Standards and Regulations. You did not elaborate on what was meant by "Transit type vehicles." If you were referring to intercity buses, you should contact the Office of Motor Carrier Standards, Federal Highway Administration, Room 3404, this address for information on their pertinent standards and regulations. For information on intracity buses, you should contact the Federal Transit Administration, Room 9328, this address. Finally, for information regarding implementation of the Americans with Disabilities Act, you should contact the Office of Technical and Information Services, U.S. Architectural and Transportation Barriers Compliance Board, 1331 F Street N.W., Suite 1000, Washington, DC 20004-1111. I hope this information is helpful. If after examining this material you have more specific questions, please feel free to contact Mr. Walter Myers of my staff at this address or by telephone at (202) 366-2992. Sincerely,
Paul Jackson Rice Chief Counsel Enclosures ref:571 d.12/10/92 |
1992 |
ID: 7996Open Mr. Rodney T. Nash, P. E. Dear Mr. Nash: This responds to your letter to the Administrator, National Highway Traffic Safety Administration (NHTSA), received in this office on November 18, 1992, and your telephone conversation of November 30, 1992 with Walter Myers of this office, regarding the proper classification of an ambulance. You indicated that Wheeled Coach Industries of Orlando, Florida, a subsidiary of Collins Industries, produces ambulances that are built on truck chassis. You stated that in the past those vehicles have been classified as trucks, but that Ford Motor Company auditors told you that they should be classified as multipurpose passenger vehicles (MPV). You said that you needed to know how to classify ambulances, observing that it appeared to you that the final stage manufacturer was free to choose between the two classifications, truck or MPV. NHTSA has long considered ambulances to be multipurpose passenger vehicles, which are defined in 49 Code of Federal Regulations (CFR) 571.3 as "a motor vehicle with motive power, except a trailer, designed to carry 10 persons or less which is constructed either on a truck chassis or with special features for occasional off-road operation." Your company's ambulances fit this definition very well: they are mounted on a truck chassis and are designed to carry ten persons or less. As you pointed out in your letter, it is true that an ambulance may carry more weight in special equipment than it carries in patients, and it may operate half its life with no patient on board. Nevertheless, NHTSA believes that whether or not a patient is on board or how much equipment is carried, the vehicle is primarily designed for the transportation and/or care of ill or injured persons, as well as the transportation of paramedic personnel to wherever they are needed. This is in contrast to a truck which is defined also in 49 CFR 571.3 as "a motor vehicle with motive power, except a trailer, designed primarily for the transportation of property or special purpose equipment". Thus, although an ambulance carries special purpose equipment, NHTSA believes that the equipment is only ancillary to the primary function of an ambulance which is the transportation of persons. Accordingly, an ambulance falls within the definition of MPV rather than truck. I hope this will help clarify this issue for you. Should you have any further questions in this regard, please feel free to contact Mr. Myers at this address or at (202) 366-2992. Sincerely,
Stephen P. Wood Assistant Chief Counsel for Rulemaking ref:571 d.12/30/92 |
1992 |
ID: 8-29-02JohnsonltrOpenMr. Frank Johnson Dear Mr. Johnson: This responds to your letter, which we received on June 3, 2002, regarding Federal Motor Vehicle Safety Standard ("FMVSS") No. 106, Brake Hoses. Specifically, you ask whether stainless steel braided brake hoses must meet the striping requirements of S5.2.1, Labeling. The answer is yes, unless the hoses are either sold as part of a motor vehicle or manufactured for use only in an assembly whose end fittings prevent the hoses from being installed in a twisted orientation. S5.2.1 requires that "[e]ach hydraulic brake hose, except hose sold as part of a motor vehicle, shall have at least two clearly identifiable stripes of at least one-sixteenth of an inch in width, placed on opposite sides of the brake hose parallel to its longitudinal axis." 49 CFR 571.106. In addition, S5.2.1 provides that "hydraulic brake hose manufactured only for use in an assembly whose end fittings prevent its installation in a twisted orientation in either side of the vehicle, need not" meet the striping requirement. 49 CFR 571.106. You indicate in your letter that Honda is proposing to use stainless steel braided hoses in a "new vehicle program" and you ask whether the outer mesh of these hoses needs to be striped. As indicated above, the requirements of S5.2.1 apply to all hydraulic brake hoses, not only those made of rubber. S5.2.1 does not exclude stainless steel braided brake hoses from the striping requirement. (See also May 12, 1994 letter to Mr. Jim Davis, Russell Performance Products, copy enclosed.) Accordingly, the stainless steel braided hose about which you inquire must be striped unless they meet either of S5.2.1's two exceptions. If you supply brake hoses to Honda and the hoses are only installed on newly-manufacured vehicles, then the hoses would not need to be striped under S5.2.1. However, if Honda were to sell any of the brake hoses as replacement parts, and therefore they are not installed on a new motor vehicle, then they would need to be striped unless they are constructed in such a way or have unique features that would prevent their being installed in a twisted manner when they are put on the vehicle as replacement brake hoses. Finally, we note that the agency has been petitioned by Parker Hannifin to update FMVSS No. 106. NHTSA granted the petition and is now evaluating the issues raised therein. If you are interested in reviewing a copy of this petition, you may access it at the following web address: I hope this information is helpful. If you have any questions, you may contact Robert Knop of this office at (202) 366-2992. Sincerely, Jaqueline Glassman Enclosure
|
2002 |
ID: 8001Open Mr. Guy Mozzicato Dear Mr. Mozzicato: This responds to your telephone conversation with Walter Myers of my staff on November 16, 1992. You explained to Mr. Myers that your company, Meridian, Inc., exports used tires and casings from the United States to other countries. You stated that although your company endeavors to export only good quality tires, other used tire exporters are not so quality-oriented and export defective or otherwise unserviceable tires. You further stated that as a result of such unscrupulous practices, the country of Venezuela has asked you what the requirements are for importation of used tires into the United States. The National Traffic and Motor Vehicle Safety Act of 1966, 15 U.S. Code, 1381 - 1431, as amended (hereinafter referred to as the Safety Act), provides at Section 1397(a)(1)(A): "No person shall . . . import into the United States, any . . . item of motor vehicle equipment manufactured on or after the date any applicable Federal motor vehicle safety standard takes effect . . . unless it is in conformity with such standard . . . ." The effect of that language is to require that motor vehicle tires, whether new or used, manufactured on and after the effective date of applicable Federal safety standards must comply with those standards before they can be imported into the United States. Manufacturers must certify such compliance by molding the symbol "DOT" onto the tire sidewalls. Therefore, to be legally imported into the United States motor vehicle tires must either display the DOT symbol or be accompanied by proof that they were manufactured before the effective date of the applicable safety standards. The only exception to the above requirement is that used truck tires which have less than 2/32 inch of tread remaining and which are being imported for retreading prior to on-road use may be imported without displaying the DOT symbol. This exception is explained in a June 18, 1981 letter addressed to Mr. Roy Littlefield of NTDRA (copy enclosed).
The standards that apply to passenger car tires are Standard 109, New Pneumatic Tires, and Standard 110, Tire Selection and Rims, found at 49 Code of Federal Regulations (CFR) 571.109 and 571.110 respectively. The standards applicable to tires for vehicles other than passenger cars are Standard 119, New Pneumatic Tires for Vehicles Other Than Passenger Cars, 49 CFR 571.119; and Standard 120, Tire Selection and Rims for Motor Vehicles Other Than Passenger Cars, 49 CFR 571.110. Other regulatory requirements pertinent to tires are Standard 117, Retreaded Pneumatic Tires; Standard 129, New Non-Pneumatic Tires for Passenger Cars; 49 CFR Part 569, Regrooved Tires; 49 CFR Part 574, Tire Identification and Recordkeeping; and 49 CFR Part 575, Consumer Information Regulations. For your information, I am enclosing a fact sheet prepared by this agency entitled Where to Obtain NHTSA's Safety Standards and Regulations which explains how and from where the full text of our safety standards and regulations may be obtained. I hope the above information will be helpful to you. If you have any further questions regarding any of these matters, please feel free to contact Mr. Myers at this address or at (202) 366-2992, FAX (202) 366-5830. Sincerely,
Paul Jackson Rice Chief Counsel Enclosure
7NCC-20 WMyers:mar:12/2/92:OCC 8001 Ref: #109#110#119#120 U:\NCC20\INTERP\MIS\8001.WKM Coord: NEF; NRM Interps: 109; 119; Redbook (4) |
|
ID: 8002OpenMr. Wayne Malbon National Tire Dealers and Retreaders Association, Inc. 1250 I Street, NW, Suite 400 Washington, D. C. 20005 Dear Mr. Malbon: This responds to your November 17, 1992 telephone conversation with Walter Myers of this office regarding a shipment of truck tire casings being imported into the United States but held up in customs because the casings do not have the DOT symbols molded onto the sidewalls. You asked for a letter from this office setting forth the requirements for the importation of truck tire casings which do not display the DOT symbol, saying that you would use such a letter to show the U. S. Customs Service (USCS)in order to secure the release of the casings. You will find enclosed a letter from this agency to Mr. Roy Littlefield of NTDRA, dated June 18, 1981, in which we explained at length the requirements for importation of truck tire casings and the rationale behind those requirements. The information contained in that letter is still fully applicable, except that the Bureau of Motor Carrier Safety referred to on page 2 is now the Office of Motor Carrier Standards, Federal Highway Administration. Also, the reference on page 3 to Mr. Harrison Feese of the USCS is no longer valid. Point of contact in USCS is now Mr. Gary Manes, same address, (202) 927-1133; or Mr. Jeff Laxague, same address, (202) 927-0402. I hope the above information will be helpful to you. If you have any further questions, please feel free to contact Mr. Myers at this address or at (202) 366-2992. Sincerely,
Paul Jackson Rice Chief Counsel Enclosure cc: Mr. Jeff Laxague U.S. Customs Service 1301 Constitution Ave., N.W. Room 4119 Washington, D. C. 20229 ref:571#117#119 d.12/11/92 |
1992 |
ID: 8021Open Mr. David M. Hart Dear Mr. Hart: This responds to your letter of November 16 asking for "feedback" on your plan to market a decal called "Flashit" for installation over a center high-mounted stop lamp. I enclose a copy of an agency letter representative of our advice to inquirers on this subject. Though this letter, to David M. Romansky, dates from September 3, 1987, it remains the agency's position today. Should you wish to contact the American Association of Motor Vehicle Administrators on this subject, please note that its new address is 4600 Wilson Boulevard, Arlington, Va. 22203. Sincerely,
Paul Jackson Rice Chief Counsel Enclosure ref:108 d:12/10/92 |
1992 |
ID: 8023-2Open Mr. Terry Wagar Dear Mr. Wagar: This responds to your letter asking about the repair of glazing in in-service motor vehicles that were originally designed to comply with Federal Motor Vehicle Safety Standard No. 205, Glazing Materials (49 CFR 571.205). You were specifically concerned about the safety of a repair process known as "Ultra B-O-N-D" which you explained involves injecting a liquid through a crack in a windshield. The repaired area is then exposed to a lamp, scraped with a razor blade, and cleaned. You explained that after this process is completed, the crack is "not as visible." By way of background information, the National Traffic and Motor Vehicle Safety Act (Safety Act) authorizes the National Highway Traffic Safety Administration (NHTSA) to issue Federal motor vehicle safety standards applicable to new motor vehicles and new motor vehicle equipment. Pursuant to this authority, the agency has issued Standard No. 205, which establishes performance requirements for all windows (called "glazing" in the Standard) in new motor vehicles and for all new replacement windows for motor vehicles. The Federal motor vehicle safety standards do not apply to vehicles and motor vehicle equipment after their first sale to a consumer. The Safety Act does include a provision that prohibits manufacturers, distributors, dealers and motor vehicle repair businesses from "rendering inoperative" any device or element of design installed on or in a motor vehicle in compliance with an applicable Federal motor vehicle safety standard. However, that provision does not require those entities, in repairing a damaged vehicle, to restore it to its original level of performance. The States do have the authority to regulate motor vehicle repairs and the condition of in-service vehicles, and this agency encourages them to take steps to ensure the safe operating condition of vehicles-in-use. (The Federal Highway Administration has in-service requirements for commercial motor vehicles used in interstate commerce.) I regret that we are unable to provide any information concerning the safety of the "Ultra B-O-N-D" process. We suggest that, in developing criteria for the condition of in-use glazing, including the permissibility of certain types of repairs, that you consider such factors as whether particular damage, even after repair, would adversely affect driver visibility, would likely become more serious during normal use (e.g., a small crack becoming a large crack), would reduce the ability of the windshield to retain unrestrained occupants in the vehicle, or would otherwise adversely affect vehicle safety. In addition, if the windshield is so extensively damaged that it cannot be repaired using the "Ultra B-O-N-D" process, and must be replaced, the new windshield should be installed in accordance with the vehicle manufacturer's instructions. In the event of an accident, an improperly installed windshield may allow unrestrained occupants to be ejected from the vehicle with resulting personal injury. I hope this information is helpful. Please feel free to contact Marvin Shaw of my staff at this address or by telephone at (202) 366-2992 if you have any further questions or need additional information. Sincerely, John Womack Acting Chief Counsel
ref:205 d.1/22/93 |
1993 |
ID: 8026-2Open Mr. Bill Dobberteen Dear Mr. Dobberteen: This responds to your letter that requested information about how the regulations administered by this agency would apply to a device you wish to market. According to your letter, your company is developing an overhead storage compartment bin to be secured to the interior roof of a utility vehicle behind its rear seat. In a telephone conversation with Marvin Shaw of my staff, you stated that you anticipate that this product will typically be installed in motor vehicles prior to their first consumer purchase. I am pleased to have this opportunity to explain our regulations to you. By way of background information, NHTSA does not provide approvals of motor vehicles or motor vehicle equipment. Under the National Traffic and Motor Vehicle Safety Act (Safety Act), it is the responsibility of the manufacturer to ensure that its motor vehicles or equipment comply with applicable Federal safety standards. The following represents our opinion based on the facts provided in your letter. NHTSA does not have any safety standards specifically covering a rear overhead storage bin. However, it is possible that the installation of such a product could affect the compliance of a vehicle with some safety standards. All new motor vehicles manufactured for sale in the United States must be certified by their manufacturers as complying with the applicable Federal motor vehicle safety standards. If your storage bin is installed in a new vehicle prior to its first sale to a customer, the person making the installation would be considered a vehicle alterer. Under our certification regulation (49 CFR Part 567), a vehicle alterer must certify that the vehicle as altered continues to comply with all applicable Federal motor vehicle safety standards. Manufacturers, distributors, dealers, or motor vehicle repair businesses modifying a used vehicle are prohibited by Section 108(a)(2)(A) of the Safety Act from knowingly rendering inoperative any safety device or element of design installed on or in a motor vehicle or item of motor vehicle equipment in compliance with an applicable Federal motor vehicle safety standard. Thus, if your storage bin is installed in a used vehicle, any businesses making such installations cannot render inoperative the vehicle's compliance with any of our standards. We also note that manufacturers of motor vehicle equipment have responsibilities under the Safety Act regarding safety defects. Under Sections 151, et seq., of the Safety Act, such manufacturers must notify purchasers about safety-related defects and remedy the product free of charge. In order to determine how installation of your storage bin could affect the compliance of a vehicle with applicable Federal safety standards, you should carefully review each standard, including but not limited to Standard No. 216 which addresses roof crush resistance and Standard No. 302 which addresses the flammability of interior materials. In that regard, I am enclosing for your information a fact sheet titled Information for New Manufacturers of Motor Vehicles and Motor Vehicle Equipment, and a booklet entitled Federal Motor Vehicle Safety Standards and Regulations. I hope this information is helpful. Please feel free to contact Marvin Shaw of my staff at this address or by telephone at (202) 366-2992 if you have any further questions or need additional information. Sincerely,
John Womack Acting Chief Counsel Enclosure ref:VSA#567 d.2/4/93 |
1993 |
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.