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: nht94-8.16OpenDATE: February 14, 1994 FROM: Richard Kreutziger -- Executive Director, New York State Business Distributor Ass'n, Inc. TO: Walter Myers -- Attorney Advisor, NHTSA TITLE: None ATTACHMT: Attached to letter dated 3/28/94 from John Womack to Richard Kreutziger (Std. 217; USA 103(d)); Also attached to letter dated 2/20/87 from Erika Z. Jones to Martin V. Chauvin TEXT: I am following up on the fax that I sent to you dated January 12, 1994. As of this date - I have not received a response, to the question that was raised during our verbal conversation, and which I requested a formal written response in the aforementioned fax. Will greatly appreciate your follow-up with the written formal response. Another question has developed pertaining to the implementation of FMVSS 217 (amended). New York State school bus regulations - Chapter VI transportation regulations - article 3 safety part 721 requires two side emergency doors on vehicles of greater than 67 pupil capacity. New York State also - in the past has required the side emergency doors to be "to the rear of center of the passenger compartment?" - they have just recently amended their regulations to conform t the FMVSS as to location "as near center of passenger compartment" - and have also in my reading have required both the left and right side emergency doors in center - BUT not in the same body section. The question is raised by some of the manufacturers/distributors - can the right side emergency door be located to the rear of the passenger compartment?
TEXT OF RICHARD KREUTZIGER'S 1/12/94 FAX TO WALTER MYERS: In a follow-up to our morning phone conversation of this date, I hereby formally request a written response (preferably by fax) to the point of discussion in reference to the ability of any individual state agency to require that an entity other than a political sub-division of the state (such as a school district) had only to meet the requirements/standards/regulations of NHTSA and not added individual state regulations, even if such regulations exceed the federal standards. Example: "ABC" Central School - is required in their purchase of a school bus to transport students to and from home to school - and/or to transport students to school sponsored events - such vehicle must meet the prescribed FMVSS and to further meet the individual state regulations that exceed the FMVSS. "XYZ" Bus Company - has a contract with "DEF" school district to transport the school pupils of the district to and from home to school, and/or school sponsored events. Because this entity is not a political sub-division the state enforcement agency relating to school bus regulations can not mandate that this private enterprise meet the state regulations that exceed the FMVSS - the only requirements for this private entity and their school buses are those that are mandated by FMVSS. I hope my interpretation of our phone conversation, reflects your |
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ID: nht94-8.17OpenDATE: February 14, 1994 FROM: Donald P. Green TO: U.S. Department of Transportation -- NHTSA TITLE: None ATTACHMT: Attached To Letter Dated 6/9/94 From John Womack To Donald Green (A42; Std. 109; 120) TEXT: Gentlemen: I am seeking official professional advice regarding the use of passenger radial tires on recreational--pull type--trailers. I have made numerous inquiries to various tire dealers and in nearly every case they have refused to consider the installing of passenger radial tires on a trailer, stating that this tire's construction with a soft sidewall could cause an uncontrollable swaying condition that could result in a serious accident. They would only install special trailer tires or light truck tires that have stiff sidewalls and are designed to operate at higher pressures resulting in a harder ride but stable condition. I had the misfortune, in an emergency situation, allowing a professional tire dealer to install a set (4) passenger radials (P215-75R15) on a 1989 trailer, since they did not have one tire to match the F78-15ST "C" rating tires that were supplied with the trailer from the manufacturer. The result was that several months later I became the victim of an upset of the trailer and the towing vehicle, that was triggered by a cross-following wind that caused the soft sidewall tires to squish to one side, forcing the tow vehicle into the adjoining left lane of a two lane divided highway. When I attempted to correct the tow vehicle the trailer reversed its attitude, overcame the Reese anti-sway systems and went into a horrifying jackknifing that ended with both trailer and tow vehicle overturned. My passenger and I were using lap and shoulder harnesses and escaped without injury. No other vehicles were involved. The 1990 GMC Suburban received $ 8,000.00 damage, the trailer was cashed out by the insurance company. I have checked with the dealer that installed the passenger radials and he claims no responsibility or negligence, saying tires were of correct size and load carrying capacity, and that there is no regulation, local, state or federal, that prohibits installing radial passenger tires on a trailer. It does seem odd that this application is allowed since it seems to be the opinion of most tire dealers that the use of these tires on trailers is a hazard to both the driver of the tow vehicle and other approaching or passing vehicles. I do not believe that I was an isolated case, and have since heard of similar accidents happening from the same cause. Your advice and reply would be appreciated. Sincerely yours, |
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ID: nht94-8.18OpenDATE: February 14, 1994 FROM: March, Gary D. -- Director, Illinois Department Of Transportation, Division Of Traffic Safety TO: Womack, John -- Acting Chief Counsel, NHTSA TITLE: Docket No. 88-21; Notice No. 3 57 FR 49413, November 2, 1992 ATTACHMT: Attached To 10/01/94 (EST.) Letter From John Womack To Gary D. March (A42; STD. 217; Part 586) TEXT: On November 2, 1992, NHTSA published a Final Rule which revised the minimum requirements for school bus emergency exits and improved access to school bus emergency doors. I am sure you would agree that the purpose of this rulemaking was to enhance the safety of children being transported in school buses. The Docket states that this Final Rule is effective May 2, 1994. We at the Illinois Department of Transportation interpret this Docket to mean school buses manufactured on or after May 2, 1994 must comply with these new standards. In September of 1993, we were asked the following question by a school bus distributor here in Illinois: Does the vehicle's "date of manufacture" correspond to the vehicle's chassis completion date or the vehicle's body completion date? In essence, he asked when do manufacturers have to comply with this Docket? On September 27, 1993, Ms. Catherine Allen of my staff spoke to Mr. David Elias of NHTSA and asked him the above question. He indicated the date of manufacture is correlated to the vehicle's date of completion. The vehicle's date of completion corresponds to the date when the body and chassis are combined to form a completed vehicle. Therefore, we interpreted that answer to mean vehicles "combined" on or after May 2, 1994 must comply with this Docket. On February 2, 1994, Ms. Allen spoke to Ms. Jane Dawson of Thomas Built Buses and asked if school buses manufactured on or after May 2, 1994 would meet the new standards. She replied, "Only if the chassis was manufactured on or after May 2, 1994." She indicated multi-stage manufacturers have the option of choosing the chassis manufacture date, the body manufacture date or a date in-between for the effective date of new standards. On February 3, 1994, Ms. Allen spoke to Mr. Charles Hott of NHTSA and asked him the same question. He confirmed what Ms. Dawson had said. Therefore, according to Mr. Hott's interpretation, a school bus which clearly displays a June 1994, or later, date of manufacture will not need to meet the standards of Docket 88-21 if the chassis was completed prior to May 2, 1994. Since we have received two different interpretations from Mr. Elias and Mr. Hott, we are asking for an official interpretation from the agency. Currently, school districts are in the process of taking bids on buses that will be delivered and perhaps have bodies mounted after May 2, 1994 to chassis manufactured prior to May 2, 1994. Therefore, I am sure you can understand the necessity of a prompt and official interpretation by your office. If you need any additional information from us, please contact Mr. Larry Wort at 217/782-4974 or Ms. Catherine Allen at 217/785-1181. I will appreciate your expeditious response. |
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ID: nht94-8.19OpenDATE: February 11, 1994 FROM: Jerry L. Steffy -- Triumph Designs, Ltd. TO: Taylor Vinson -- NHTSA TITLE: None ATTACHMT: Attached to letter dated 3/16/94 from John Womack to Jerry L. Steffy (A42; Std. 108; Part 555) TEXT: Since I faxed you with my question regarding FMVSS 108 and ECE Reg. 20, I received Part 555 of 49 CFR from Luke Loy. 555.5 implies that we could apply for an exemption from FMVSS 108 for this headlamp since there exists "an equivalent overall level of motor vehicle safety." This is of course, if NHTSA recognizes the worthiness of the testing under ECE Reg. 20. This exemption would only be for the first model year as afterwards we will change to a headlamp already FMVSS 108. Can you please confirm for the if this is a route we can employ in this instance? Best regards. 2-10-94 fax from J.L. Steffy to Taylor Vinson: Dear Taylor: Luke Loy suggested that I contact you with a specific query I have. Recently, in Canada, we were able to use ECE Reg. 20 in lieu of FMVSS 108 for a particular headlamp system use. Is it possible to substitute ECE 20 for FMVSS 108 in the states in some instances? Of course the majority of our suppliers fulfill testing according to FMVSS 108 however, there are individual exceptions. Some cases may require significant investment in order to have individual cases comply, so it is important to know. Best regards |
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ID: nht94-8.2OpenDATE: March 7, 1994 FROM: John Womack -- Acting Chief Counsel, NHTSA TO: Lawrence A. Beyer TITLE: None ATTACHMT: Attached to letter dated 2/14/94 from Lawrence A. Beyer to Z. Taylor Vinson (OCC-9662) TEXT: This responds to your FAX of February 14, 1994, to Taylor Vinson of this Office regarding the "re-importation" of used certified motorcycles into the United States after modifications have been performed abroad. These modifications would not involve a "knowingly rendering inoperative" of equipment related to the Federal motor vehicle safety standards. You have asked whether our interpretation of November 16, 1992, "regarding this matter" remains operative. We assume the letter to which you refer is the one addressed to Wolfgang Klamp of Blaine, Washington. Mr. Klamp's wife crossed the border daily in her Canadian-manufactured Ford Tempo to her Canadian place of employment. Because the vehicle was not certified as meeting U.S. safety standards, the U.S. Customs Service had informed her the car would not be admitted in the future without going through the formal entry process for conversion to the U.S. standards. We verified that the Customs Service was acting in accordance with the National Traffic and Motor Vehicle Safety Act, and provided several suggestions. This letter remains our position. However, we fail to understand its relevance to the fact situation you present regarding importation of motorcycles that are certified as meeting the Federal motor vehicle safety standards. We can only surmise that individual Customs officials may be questioning whether the modified motorcycles comply with all applicable U.S. Federal motor vehicle safety standards at the time of entry, notwithstanding the fact that they are certified as complying as of their manufacture. As you know, a motor vehicle offered for importation must comply with the U.S. safety standards at the time of importation (or be converted to those standards after entry), regardless of its state of compliance at the time of its manufacture. We have no regulations under which a manufacturer, distributor, dealer, or motor vehicle repair business may state that it has not knowingly rendered inoperative any device or element of design installed in accordance with a Federal motor vehicle safety standard. However, we would recommend that Customs accept such a statement accompanying an HS-7 Form's declaration of vehicle compliance if it also contained the statement that in the modifier's opinion the vehicle remained in compliance upon completion of the modifications. Alternatively, and relevant to modifications that relate to a safety standard which may not have had to be met initially (i.e. installation of glazing on a motorcycle that was not originally manufactured with a windshield), we suggest that the modifier provide a statement, in writing or on a label affixed to the vehicle, of the kind required of an alterer of a new vehicle, as set forth in 49 CFR 567.7. This statement attests to the continuing compliance of a motor vehicle after modification. Our willingness to accept such a statement should enable Customs to enter the modified motorcycles as conforming vehicles. |
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ID: nht94-8.20OpenDATE: February 10, 1994 FROM: John Womack -- Acting Chief Counsel, NHTSA TO: David Shapiro -- RV Designer Collection, Woodbridge, Inc. TITLE: None ATTACHMT: Attached to letter dated 11/17/93 from David Shapiro to NHTSA Chief Counsel (OCC-9358) TEXT: This responds to your inquiry about the applicability of Standard No. 302, Flammability of Interior Materials to aftermarket products. You state that you are planning to market fabric window coverings such as drapes and fabric bedding such as bedspreads for use in recreational vehicles. In response to your request for confirmation that Standard No. 302 does not apply to aftermarket products, I am pleased to have this opportunity to explain our regulations to you. By way of background information, NHTSA is authorized to issue Federal Motor Vehicle Safety Standards that set performance requirements for new motor vehicles and items of motor vehicle equipment. NHTSA does not, however, approve or certify any vehicles or items of equipment. Instead, the Safety Act establishes a "self-certification" process under which each manufacturer is responsible for certifying that its products meet all applicable safety standards. The agency periodically tests new vehicles and items of equipment for compliance with the standards. In response to your question, there are currently no Federal motor vehicle safety standards (FMVSS's) that directly apply to the products you wish to manufacture. Under the authority of the Safety Act, NHTSA has issued Standard No. 302, which specifies requirements for the flammability resistance of materials in the occupant compartment of new vehicles. However, Standard No. 302 would not apply to your products because that standard applies to new motor vehicles and not to aftermarket items of motor vehicle equipment. I note, however, that there are other Federal requirements that indirectly affect the manufacture and sale of your products. Under the Safety Act, your products are considered to be items of motor vehicle equipment. As a manufacturer of motor vehicle equipment, you are subject to the requirements in S151-159 of the Safety Act concerning the recall and remedy of products with safety related defects. I have enclosed an information sheet that briefly describes those responsibilities. In the event that you or NHTSA determines that your products contain a safety-related defect, you would be responsible for notifying purchasers of the defective equipment and remedying the problem free of charge. I note that even though Standard No. 302 would not apply to your product, the product's flammability characteristics could be relevant to whether it contained a safety related defect. Manufacturers, distributors, dealers, and motor vehicle repair businesses are subject to S108(a)(2)(A) of the Safety Act, which states: "No manufacturer, distributor, dealer, or motor vehicle repair business shall knowingly render inoperative...any vehicle or item of motor vehicle equipment in compliance with an applicable Federal motor vehicle safety standard...." This section would prohibit any manufacturer, distributor, dealer, or repair business from installing your product in used vehicles if the effect of such installation was to render inoperative the compliance of the vehicle with any safety standard, including Standard No. 302. The "render inoperative" prohibition of S108(a)(2)(A) does not apply to the actions of vehicle owners in adding to or otherwise modifying their vehicles or items of motor vehicle equipment. Thus, if your products were placed in vehicles by the vehicle owners, your products would not need to meet any FMVSSs. Nevertheless, in the interest of safety, we suggest you consider conforming your product to a flammability resistance standard equivalent to Standard No. 302. I hope this information is helpful. If you have any further questions about NHTSA's safety standards, please feel free to contact Marvin Shaw of my staff at this address or by telephone at (202) 366-2992. |
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ID: nht94-8.21OpenDATE: February 10, 1994 FROM: John Womack -- Acting Chief Counsel, NHTSA TO: Pat McCue -- Allied Service Systems Manufacturing TITLE: None ATTACHMT: Attached to letter dated 7/15/93 from Pat McCue to Ed Jettner (OCC-8962) TEXT: This responds to your letter to Mr. Ed Jettner of this agency concerning an occupant restraint system you have developed to protect medics and attendants in the back of ambulances. I apologize for the delay in our response. The system consists of a vest worn by the attendant which is attached by a tether strap to the ambulance. During an August 23, 1993 phone call with Mary Versailles of my staff, you explained that the tether straps include retractors which lock during a crash. During this phone call you also stated that the back vest can be attached to two tethers on the vehicle wall adjacent to the bench seat, and that the front of the vest is attached to another tether on the opposite wall. You asked for advice on "how regulations are established and how products are tested to meet standards." The National Traffic and Motor Vehicle Safety Act (the Safety Act) authorizes this agency to issue Federal motor vehicle safety standards applicable to new motor vehicles and new items of motor vehicle equipment. Section 108(a)(1)(A) of the Safety Act prohibits any person from manufacturing, introducing into commerce, selling, or importing any new motor vehicle or item of motor vehicle equipment unless the vehicle or equipment is in conformity with all applicable safety standards. NHTSA does not approve motor vehicles or motor vehicle equipment, nor do we endorse any commercial products. Instead, the Safety Act establishes a "self-certification" process under which each manufacturer is responsible for certifying that its products meet all applicable safety standards. NHTSA has exercised its authority to establish three safety standards that may be relevant to a vest and tether system for ambulance attendants. The first is Standard No. 208, Occupant Crash Protection, which sets forth requirements for occupant protection at the various seating positions in vehicles. Ambulances, which are classified as multipurpose passenger vehicles under our regulations, are required to have safety belts at each designated seating position. The second relevant standard is Standard No. 302, Flammability of Interior Materials. This standard specifies burn resistance requirements for materials used in the occupant compartment of motor vehicles, including ambulances. The third relevant safety standard is Standard No. 209, Seat Belt Assemblies, which sets forth strength, elongation, webbing width, durability, and other requirements for seat belt assemblies. Standards No. 208 and No. 302 apply, with certain exceptions that are not relevant to your product, to vehicles and not directly to items of equipment. Thus, the vehicle manufacturer, and not the equipment manufacturer, is responsible for certifying compliance to these standards. Standard No. 209, however, applies to seat belt assemblies as separate items of motor vehicle equipment, regardless of whether the belts are installed as original equipment in a motor vehicle or sold as replacements. Standard No. 209 defines a "seat belt assembly" as "any strap, webbing, or similar device designed to secure a person in a motor vehicle in order to mitigate the results of any accident, including all necessary buckles and other fasteners, and all hardware designed for installing such seat belt assembly in a motor vehicle." Thus, your vest and tether system would be considered a "seat belt assembly," and the manufacturer of the system would be required to certify that it complies with Standard No. 209 before it could be sold. If the vest and tether system was installed as original equipment by the vehicle manufacturer, the vehicle manufacturer would be required to certify that the vehicle complied with all applicable safety standards with that equipment installed in the vehicle. If the device was added to a new ambulance prior to its first sale, e.g., by the dealer, the person who modified the vehicle 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. I note that in your phone conversation with Ms. Versailles, you stated that your ambulances do have safety belts on the bench seat, however, these do not provide the mobility needed by the attendants when they are caring for a patient. It is our understanding that you intend the vest and tether system to supplement the original safety belts. If your vest and tether system were installed in addition to the safety belts required by Standard No. 208, and provided that the installation did not interfere with the required safety belts, such installation would not affect the compliance of the vehicle with Standard No. 208, since the standard's requirements would be fully met by the original belts. After the first purchase of a vehicle for purposes other than resale, the only provision in Federal law that affects the vehicle's continuing compliance with an applicable safety standard is set forth in section 108(a)(2)(A) of the Safety Act. That section provides that: No manufacturer, distributor, dealer, or motor vehicle repair business shall knowingly render inoperative, in whole or in part, any device or element of design installed on or in a motor vehicle ... in compliance with an applicable Federal motor vehicle safety standard. This provision would prohibit any of the named commercial entities from installing your system if such installation rendered inoperative the compliance of the vehicle with any applicable safety standard. For example, if the material used in your system did not meet the burn resistance requirements of Standard No. 302, installation of the system would render inoperative compliance with that standard. The render inoperative provision does not prohibit owners from modifying their vehicles, even if such modification adversely affects the compliance of the vehicle with safety standards. However, this agency encourages vehicle owners not to make any modifications which would negatively affect the occupant protection systems installed in their vehicles. Also, vehicle modifications by owners may be regulated by state law. In addition to certifying that your vest and tether system complies with Standard No. 209, I urge you to exercise care in evaluating how effective this system would be in an actual crash situation. The original belt system supplied with the vehicle limits the motion of the occupant by keeping the occupant attached to the seat. Your system would have a dual purpose: allowing the attendant sufficient mobility to care for a patient and protecting the attendant in a crash. The tether on your system will not achieve this second purpose if it allows too much motion within the compartment. You may wish to consult a private attorney familiar with the law in the State of Arizona regarding potential liability in tort for your business. I also note that every State provides for some degree of civil liability for consumer products and repair work. I have also enclosed an information sheet that identifies relevant Federal statutes and NHTSA standards and regulations affecting motor vehicle and motor vehicle equipment manufacturers, and explains how to obtain copies of these materials. I hope you find this information helpful. If you have any other questions, please contact Mary Versailles of my staff at this address or by phone at (202) 366-2992. |
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ID: nht95-5.16OpenTYPE: INTERPRETATION-NHTSA DATE: July 2, 1995 FROM: John Womack -- Acting Chief Counsel, NHTSA TO: Vladimir Salita TITLE: NONE ATTACHMT: ATTACHED TO 5/11/95 LETTER FROM JOHN WOMACK TO TERESA THOMPSON; ALSO ATTACHED TO 7/30/93 LETTER FROM JOHN WOMACK TO WAYNE FERGUSON (STD. 108); ALSO ATTACHED TO 5/10/95 LETTER FROM VLADIMIR SALITA TO CHIEF COUNCIL, NHTSA (OCC 10907) TEXT: Dear Mr. Salita: This responds to your letter asking about the applicability of Federal requirements to three inventions you are developing a warning and teaching device for improving driving habits and fuel economy, a deceleration warning light, and a self-adjustable windshield wiper. The first item would "warn drivers by indicating the excessive deceleration, acceleration and dangerous speed at turns by emitting sound signals," and would be mounted on the dashboard. The second item would measure "actual vehicle deceleration" and control "the frequency of light flashing (preferable high-mounted brake light)," to alert the drivers of following vehicles. The third item would control "the rate of windshield wiper sweeps according to the intensity of rain." I am pleased to provide the information you requested. By way of background information, the National Highway Traffic Safety Administration (NHTSA) is authorized to issue Federal Motor Vehicle Safety Standards for new motor vehicles and new items of motor vehicle equipment. This agency does not provide approvals of 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 devices would be required to certify that their vehicles meet all applicable safety standards with the devices installed. While we do not have sufficient information to identify all the standards that might be relevant to your devices, I would like to bring three standards to your attention. Standard No. 201, Occupant Protection in Interior Impact, would be relevant to your dashboard-mounted warning and teaching device. That standard specifies requirements to protect occupants from impact with interior components and could affect where or how the device could be installed in a vehicle. Standard No. 108, Lamps, Reflective Devices, and Associated Equipment, would be relevant to the deceleration warning light. That standard requires, among other things, that all original motor vehicle lighting equipment be steady burning in use, unless the standard provides otherwise. Since the standard does not specify deceleration warning lights as an exception to this requirement, they must be steady burning. Therefore, your added flashing deceleration light could not be installed on new vehicles. Because center high mounted stop lamps (CHMSLs) are not permitted to flash and must be activated only by the service brake, your use of the CHMSL as a deceleration light also is not allowed on new vehicles. I am enclosing copies of two recent letters (addressed to Mr. Wayne Ferguson, July 30, 1993, and Ms. Teresa Thompson, May 11, 1995), which provide a more detailed discussion of requirements relevant to deceleration lights. Standard No. 104, Windshield Wiping and Washing Systems, would be relevant to your self-adjustable windshield wiper. That standard specifies a number of requirements for windshield wiping systems. The standard would not preclude the inclusion of a self-adjustable windshield wiping feature. However, a vehicle manufacturer would need to ensure that the windshield wiping system with such a device met all of the requirements of that standard. No standards would apply to your devices to the extent that they were 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 flashing deceleration light could not be installed by such businesses on used vehicles. If your device affects a CHMSL installed in compliance with Standard No. 108, it could not be installed by the above named businesses. Similarly, your other devices 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 American Association of Motor Vehicle Administrators, 4600 Wilson Boulevard, Arlington, VA 22303. Finally, all three of your devices are considered to be "motor vehicle equipment" under Federal law. This means that the manufacturer 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. You have obviously spent a great of time and effort thinking about how to improve driving safety. We appreciate your efforts in this area and the contributions that inventors such as you make to motor vehicle safety. 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 further questions about lighting requirements, please contact Mr. Taylor Vinson at (202) 366-2992. For further information about other safety standards, please contact Ms. Dorothy Nakama at the same telephone number. Enclosures NHTSA INFORMATION SHEET ENTITLED "INFORMATION FOR NEW MANUFACTURERS OF MOTOR VEHICLES AND MOTOR VEHICLE EQUIPMENT" (TEXT OMITTED) |
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ID: nht95-5.17OpenTYPE: INTERPRETATION-NHTSA DATE: July 5, 1995 FROM: John Womack -- Acting Chief Counsel, NHTSA TO: Milford R. Bennett -- Director, North American Operations Safety, Affairs and Regulations, GM TITLE: NONE TEXT: Dear Mr. Bennett: This responds to General Motors' (GM's) inquiry, raised in a June 16, 1995 meeting with the agency, regarding the test procedures in Federal Motor Vehicle Safety Standard No. 114 for determining whether a vehicle is in the "park" position. Under those procedures, a vehicle is deemed to be in park if it ceases rolling within 150 mm. You were concerned that different methods of measuring this distance could result in some vehicles not complying with the requirement that the vehicle roll less than 150 mm. The short answer to your question is that the test procedure is a "static" measurement procedure. In other words, the agency will not measure the distance that a vehicle has rolled until after the vehicle has completely ceased moving. This agency recently amended Standard No. 114, adding test procedures to determine whether the key can be removed when the transmission is in positions other than the "park" position and that the transmission remains locked in "park" after key removal. (60 FR 30006; June 7, 1995) NHTSA initiated that action in response to a petition from the automotive industry alleging that such a procedure was needed to make the standard objective. Section S4.2.1(a)(3) of the amended standard specifies that "[each] vehicle shall not move more than 150 mm on a 10 percent grade when the transmission or transmission shift lever is locked in "park." To demonstrate that the vehicle is in "park" prior to attempting to remove the key, the test procedures in S5.2(e) and S5.3(b) both state: Drive the vehicle forward up a 10 percent grade and stop it with the service brakes. Apply the parking brake (if present). n1 Move the shift mechanism to the "park" position. Apply the service brakes. Release the parking brake. Release the service brakes . . . Verify that vehicle movement was less than or equal to 150 mm after release of the service brakes. n1 The parenthetical reference occurs only in S5.3(b). In the June 16 meeting with the agency, GM stated that vehicle movement could be measured in two different ways: dynamic or static. GM inquired as to which method NHTSA interpreted the standard as specifying, because the results using these two methods would be different. The "dynamic" method of measuring vehicle movement was described by GM as measuring the maximum play-out of a spool of wire attached to the front bumper after release of the service brakes. The "static" method would measure vehicle movement from a reference point on the wheels after the vehicle has come to a complete stop. Under the dynamic method, a portion of the measured play-out would be due to the "rocking" motion of the vehicle's chassis on its suspension when the transmission engaged. The driveline components would also contribute some movement by temporarily storing some of the kinetic energy of the moving vehicle by flexing and twisting. However, both of these contributions to total rearward movement are temporary, disappearing after the vehicle comes to rest, as in the static measuring method. GM presented test data for certain vehicles and theoretical worst-case calculations of static roll distance on non-production hypothetical vehicles and one test vehicle. The test data showed that dynamic measuring produces larger measurements of roll than does static measuring. NHTSA interprets the limitation on vehicle movement specified in S4.2.1(a)(3) as referring to static movement. The agency did not contemplate using the dynamic method. The agency intends to measure only permanent components of total vehicle movement, using the "static" method. When conducting compliance testing, NHTSA will measure vehicle movement from a reference point such as the wheel centerline position. The starting time for the measurement will be at the moment before the service brakes are released. The ending time of the measurement will be when the vehicle has completely ceased moving, bouncing, and rocking (i.e., until the vehicle is again "static"). This agency believes that its confirmation that the static test method is the proper method should relieve any realistic concerns regarding compliance of the 1996 model year vehicles GM tested, and probably of any future vehicles as well. The actual tests GM conducted in preparation for the meeting with NHTSA all showed static roll distances well within the requirements of Standard No. 114. I hope this information is helpful. If you have any further questions about NHTSA's safety standards, please feel free to contact Paul Atelsek of my staff at this address or by telephone at (202) 366-2992. |
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ID: nht95-5.18OpenTYPE: INTERPRETATION-NHTSA DATE: July 10, 1995 FROM: John Womack -- Acting Chief Counsel, NHTSA TO: Winston Sharples -- President, Cantab Motors, Ltd. TITLE: NONE TEXT: Dear Mr. Sharples We have received the application of Cantab Motors for temporary exemption from Motor Vehicle Safety Standards Nos. 208 and 214. The application meets our procedural requirements, and a Federal Register notice requesting comment is being prepared for publication. We shall inform you when the Administrator has reached a decision on this matter, which we estimate will be between the middle of September and the middle of October. Cantab's previous exemption from Standard No. 208 expired on May 1, 1993. Accordingly, Cantab may be in violation of 49 U.S.C. 30112(a) if it has manufactured for sale and sold vehicles manufactured after that date. Its application states that "[in] the preceding twelve months, Cantab has manufactured nine Morgans for sale in the United States." Within 30 days of your receipt of this letter, please furnish the total number of Morgans that Cantab has manufactured for sale after May 1, 1993, and sold in the United States, between May 1, 1993, and the date of your response. Cantab should be aware that any sales of nonconforming vehicles before a grant of its application may be in violation of 49 U.S.C. 30112(a). If Cantab determines that it has manufactured and sold noncomplying vehicles, then it is required to notify and remedy the noncompliance according to statute. Alternatively, it may file an application for a determination pursuant to 49 CFR Part 556 that its noncompliance is inconsequential to safety. If this application is granted, Cantab would be excused from the statutory requirement to notify and remedy. As a final matter, the application indicates Cantab's belief that it would be exempt from the phase-in requirements of Standard No. 214 for 1995 since only .75 car would be subject to the requirement. Although .75 car is less than one vehicle, the agency rounds up from .50 vehicle in its calculations of compliance. For the same reason, the 1.87 vehicle estimated for 1996 compliance would be two vehicles, not one. The application is sufficient to cover both years. If you have any questions on this matter, you may discuss them with Taylor Vinson of this Office (202-366-5263). |
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.