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
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ID: 1982-1.17OpenTYPE: INTERPRETATION-NHTSA DATE: 02/18/82 FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA TO: Consumer and Technical Affairs, Woodhill Permatex TITLE: FMVSS INTERPRETATION TEXT: This responds to your recent letter concerning a product you manufacture which is used to repair breaks in automobile windshields. You ask whether such a repair product would conflict with any present motor vehicle safety standards. The National Highway Traffic Safety Administration has issued Federal Motor Vehicle Safety Standard No. 205 which specifies performance and location requirements for glazing materials used on motor vehicles (copy enclosed). This standard would not apply to a repair product such as you describe, however. There is no Federal regulation which would prohibit the use of such a product or process in the repair of windshields which have previously been installed in vehicles and damaged in use. Using such a material or process in a new windshield which may require repair as a result of damage sustained, for example, in shipment could cause the windshield to fail to meet the performance requirements of Safety Standard No. 205, which would be the responsibility of the person selling the windshield. Therefore, we do not recommend use of windshield repair kits prior to the first purchase of a new windshield by a consumer. Please contact Hugh Oates of my staff if you have any further questions. Sincerely, ATTACH. January 26, 1982 Legal Counsel -- National Highway Traffic Safety Administration Dear Sir: We are manufacturers and marketers of maintenance, service and repair products for the professional and the do-it-yourselfer for use around the home and in the repair of vehicles. It has come to our attention that there exists a need to develop a product to repair stone damaged and bulls eye breaks in automobile windshields. My question is whether or not such a repair product would conflict with any present motor vehicle safety standards. Your prompt counsel would be appreciated since we are beginning to formulate plans for our next fiscal year. Very truly yours, Robert J. Carter -- Director, Consumer and Technical Affairs, WOODHILL PERMATEX |
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ID: 1982-1.39OpenTYPE: INTERPRETATION-NHTSA DATE: 04/02/82 FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA TO: American Transportation Corporation TITLE: FMVSR INTERPRETATION TEXT: This responds to your February 27, 1982, letter asking whether a vehicle which transports 10 or fewer persons could be classified as a bus if it is built with a traditional bus body. The vehicle transports fewer persons than normal, because it is designed for wheelchair occupants. The answer to your question is no. The classification of a vehicle as a bus or a multipurpose passenger vehicle for the purposes of the Federal motor vehicle definitions of "bus" and "multipurpose passenger vehicle" in 49 CFR 571.3. A vehicle that transports the number of persons that you mentioned in your letter must be classified as a multipurpose passenger vehicle. The fact that the vehicle is designed as a bus has no relevance to its classification. The controlling factor is passenger capacity. Since the vehicle would be a multipurpose passenger vehicle, it would be required to comply with all of the standards applicable to those vehicles. This would include complaince with Standard No. 206, Door Locks and Door Retention Components. SINCERELY, February 27, 1982 Office of Chief Counsil United States Department of Transportation National Highway Traffic Safety Admn. Dear Sir: American Transportation Corporation manufacturers buses used on both school buses and as transit buses. One of the small (under 10,000# GVWR) buses, when equipped for transporting non-ambulatory passengers in wheel chairs could reduce the passenger capacity to 10 persons or less. Since the bus body does not change, could this bus still be classified as a bus and not a multipurpose passenger vehicle (MPV)? If the classification should have to be MPV, would the entrance door and the special access door to the loading and unloading lift have to meet the performance requirements of FMVSS 206 for door locks and door retention components? We would appreciate very much an early reply. Thank you in advance for your consideration. E. M. Ryan, Sr. Project Engineer-Specifications CC: TERRY HARRELL |
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ID: 1982-2.16OpenDATE: 06/23/82 FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA TO: Grebe; Gross; Jensen & Peek; P.C. -- J. Mack Shively TITLE: FMVSS INTERPRETATION TEXT: Grebe, Gross, Jensen & Peek, P.C. 1530 S.W. Taylor Street Portland, Oregon 97205
This is in response to your letter of May 11, requesting our views as to the applicability of vehicle identification number requirements and certification label requirements to a semi-trailer to be manufactured by Cranston Diversified Industries. This trailer would have three interchangeable sections.
You are correct in your interpretation of the manner in which our requirements would be applied to the trailers in question. Only one vehicle identification number and one certification label are required. Affixing the label to the left side of the front section would be consistent with our regulations.
Sincerely,
Frank Berndt Chief Counsel Office of Chief Counsel RE: Manufacturer Identification Cranston Diversified Industries, Inc.
Dear Sirs:
My client, Cranston Diversified Industries, Inc., is currently negotiating with the patent holder to construct a semi-trailer which can be converted from a "flat" to a "drop center" trailer configuration. The design utilizes interchangeable front, rear, and center sections.
I have concluded that pursuant to 49 C.F.R ampersand 571.155, Standard No. 115, S4.1, each vehicle manufactured requires only one vehicle identification number. I have also concluded that the label to be attached to each trailer should be affixed to the left side of the front section (the hitch structure) and that only one label is required pursuant to 49 C.F.R. ampersand 567.4(d). Please advise me as to whether my interpretation of your Regulations is correct. I have enclosed a copy of the Letters Patent of the United States issued for the trailer which include a detailed description of its structure.
Thank you very much for your attention to this matter. Sincerely,
J. Mack Shively JMS:vs Enclosures cc: Cranston Diversified Industries, Inc. |
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ID: 1982-2.23OpenDATE: 07/23/82 FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA TO: Ron Gustafson TITLE: FMVSS INTERPRETATION TEXT: This responds to your letter of June 28, 1982, asking about requirements applicable to child restraints sold in the United States as well as any necessary permits or licenses. You also asked about any U.S. testing organizations, procedures or standards for child restraints. All child restraints sold in the U.S. must conform with the minimum performance requirements of Federal Motor Vehicle Safety Standard No. 213, Child Restraint Systems. The standard also sets out the test procedures that are used to measure the performance of child restraints. There are no other performance requirements or test procedures applicable to child restraints. I am enclosing a copy of the standard. You are not required to obtain a permit or license from this agency prior to selling a child restraint in the U.S., nor are you required to obtain approval from any U.S. testing organization. As a manufacturer of motor vehicle equipment, you are required by Part 566, Manufacturer Identification, of our regulation to submit certain identifying information to the agency. I have enclosed a copy of Part 566. In addition, you would be required by the National Traffic and Motor Vehicle Safety Act (15 U.S.C. @ 1392 et seg.) to certify that your child restraint complies with all applicable Federal Motor Vehicle Safety Standards. Under the Act, you would also be responsible for conducting a notification and remedy campaign for any safety-related defect in your product. I am enclosing a copy of the Act, which defines your responsibilities as a manufacturer. If you have any further question, please let me know. ENCLS. June 28, 1987 Furudals Bruks Kursinternat 790 70 FURUDAL Sweden National Highway Safety Administration To Whom it May Concern: I am interested in receiving information concerning rules, regulations, requirements, procedures for testing, etc. concerning child safety seats in automobiles. There is interest in introducing a such a product in the USA. Therefore I would like to know of any minimum requirements (re: design, construction, materials, etc.) as well as any permits or licenses regarding those requirements. Also if there are any US testing organizations, procedures, or standards for this type of product please inform me. Thank you. Ron Gustafson RON GUSTAFSON |
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ID: 1982-3.26OpenTYPE: INTERPRETATION-NHTSA DATE: 11/30/82 FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA TO: CAPACITY OF TEXAS INC. TITLE: FMVSS INTERPRETATION TEXT:
Dear Mr. Wright:
This responds to your letter of October 11, 1982, concerning regulations specifying the type of steering system required in vehicles. In particular, you asked if a mechanical link is required in the steering system or whether a hydraulic system is acceptable. As explained below, a manufacturer can use either a mechanical or hydraulic system to meet the requirements of the applicable Federal Motor Vehicle Safety Standards.
There are two Federal Motor Vehicle Safety Standards that apply to vehicle steering systems: Standard No 203, Impact Protection for the Driver Steering Control System, and Standard No. 204, Steering Column Rearward Displacement. Both standards, copies of which are enclosed, establish performance requirements to protect the driver from steering column-related injuries in a crash. Any type of steering system, either mechanical or hydraulic, can be used as long as it meets the applicable requirements of those standards. If you have any further questions please let me know. Sincerely,
Original Signed By Frank Berndt Chief Counsel
Frank Berndt Chief Counsel National Highway Traffic Safety Administration Room 5219 400-7th Street Southwest Washington, D.C. 20590
I have been investigating all regulations pertaining to the type of steering required in vehicles for (trucks, tractors) highway and off-highway use.
It is my understanding there is no type of regulations requiring a mechanical link in the system, and that a straight hydraulic system is acceptable.
I contacted Steve Oesch, from your department and he researched the issue and found no reference to the type of system allowed. I would appreciate a letter from you confirming that there are no regulations or requirements that require any certain type of steering arrangement.
Thank you, Sincerely yours,
Gene Wright Vice-President, Manufacturing CAPACITY OF TEXAS, INC. |
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ID: 1983-1.1OpenTYPE: INTERPRETATION-NHTSA DATE: 01/01/83 EST. FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA TO: Mr. Richard R. Kelm -- Manager of Automotive Glass Replacement Services, Libby-Ownes - Ford Company TITLE: FMVSS INTERPRETATION TEXT: This responds to your letter of September 24, 1983, regarding the certification and marking requirements for glazing under S6 of Safety Standard No. 205, Glazing Materials. You stated that you are interested in "out-sourcing some of your replacements auto glass requirements" to other manufacturers and sought clarification on four points concerning glazing identification. Section 6 of Standard No. 205 deals specifically with the certification and marking requirements for glazing materials. The standard incorporates by reference the American National Standard "Safety Code for Safety Glazing Materials for Glazing Motor Vehicles Operating on Land Highways," Z26.6-1966 (ANS Z26). You ask whether it is permissible under National Highway Traffic Safety Administration (NHTSA) regulations to allow another manufacturer, using its own DOT code mark, to put an LOF trademark and logo on its glass. Section 6 of ANS 226 states that a manufacturer shall mark safety glazing materials with its own "distinctive designation or trademark." The purpose behind these markings was to aid in the tracing of glazing materials and the enforcement of applicable standards. Your letter states that the other manufacturer will place their DOT code mark on the safety glass. Since the other manufacturer is using its own DOT code mark, the tracing and enforcement policies will not be circumvented. Therefore, under these circumstances, the use of LOF's logo and trademark is not violative of Standard No. 205. Further, you ask whether another glass manufacturer can use LOF's "M" number on his glass with LOF's permission. As long as the model number is an accurate description of the specified glazing material being produced, the other manufacturer may use it. Lastly, you ask if the name of the country of manufacture must appear on the safety glass if not manufactured in the United States. The standard does not mandate that the country of manufacture be marked on the safety glazing materials. Original Signed by Frank Berndt, Chief Counsel
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ID: 1983-1.14OpenTYPE: INTERPRETATION-NHTSA DATE: 02/07/83 FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA TO: Empire Construction Co. Inc. -- H.J. Lindekugel, Consultant TITLE: FMVSS INTERPRETATION TEXT:
Mr. H. J. Lindekugel Consultant Empire Construction Co., Inc. East 10310 Montgomery Box 11012 Spokane, Washington 99211
Dear Mr. Lindekugel:
This responds to your recent letter asking if the rim marking requirements of Safety Standard No. 120, Tire Selection and Rims for Motor Vehicle Other Than Passenger Cars, apply to "remanufactured truck wheels." They do not.
Section S5.2 of Standard No. 120 sets forth rim marking requirements applicable to all new rims manufactured on and after September 1, 1977, and designed for use on motor vehicles other than passenger cars. Remanufactured wheels are considered used wheels instead of new wheels for purpose of Standard No. 120, and so are not subject to the rim marking requirements.
Should you need any further information or have any further questions in this area, please contact Mr. Steve Kratzke of my staff at (202)426-2992.
Sincerely, Original Signed by Frank Berndt
Attention: Attorney for Rulemaking
Re: DOT number for remanufacturing process
Greetings: This writer was referred to you by Lauretta Carlson, Highway Safety Program Area Director, National Highway Traffic Safety Administration, Seattle, WA.
The point of inquiry is whether or not a DOT identification number is necessary for a re-manufactured truck wheel, not a repaired wheel. The review made with Lauretta Carlson showed no such standards as a pre-requisite. She sent me a copy of the Code of Federal Regulations, 57-119 and 57-120 which confirmed her judgement she suggested this letter.
Please advise the writer if the position she has taken is correct. Very Truly Yours,
H. J. Lindekugel, Consultant |
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ID: 1983-2.7OpenTYPE: INTERPRETATION-NHTSA DATE: 05/17/83 FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA TO: Eaton Limited TITLE: FMVSS INTERPRETATION TEXT: This responds to your recent letter asking a question concerning Safety Standard No. 106, Brake Hoses. You note that there is an ambiguity in the formula referenced in paragraph S8.3.2(e) of that standard as set forth in the Code of Federal Regulations. Specifically, you ask whether the entire fraction that is specified is multiplied by "100" or whether only the denominator of the fraction is multiplied by "100". The correct formula is as follows: (W3-W4) - (W1-W2) / (W1-W2) X 100 The formula as specified in the Code of Federal Regulations should, therefore, include additional brackets around the fraction, separating the fraction from the "X 100" figure. We will notify the Federal Register concerning this error. I hope this has clarified any misunderstanding you may have had. Sincerely, ATTACH. APRIL 11, 1983 Office of Vehicle Safety Standards, Crash Avoidance Division, National Highway Traffic Safety Administration, Dear Sirs, I have been comparing Federal Motor Vehicle Safety Standard number 106-74, Brake Hoses, with the Code of Federal Regulations - Title 49 - S571,106 - Standard 106 - Brake Hoses. I would draw your attention to paragraph S8.3.2(e) ref calculation of the percentage increase in volume. In 106-74 the formula is given as:- Percent of increase = (W3-W4) - (W1-W2) / (W1-W2) x 100 In S571,106 the formula is given as:- Percent of increase = [(W3-W4) - W1-W2)] / (W1-W2) x 100 This could be interpreted as:- Percent of increase = [(W3-W4) - (W1-W2)] / (W1-W2) x 100 which is not the same as the formula given in 106-74. This, I believe, could lead to problems. I enclose the appropriate pages from the standards mentioned with the paragraph highlighted in red. I should be pleased to receive your comments as we are endeavouring to get a potential supplier of hoses to comply with S.571.106. Yours faithfully, N. COPE Standards Engineer -- EATON LIMITED TRUCK COMPONENTS OPERATIONS |
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ID: 1983-3.17OpenTYPE: INTERPRETATION-NHTSA DATE: 10/28/83 FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA TO: Nissan Motor Co. Ltd. -- Shizuo Suzuki TITLE: FMVSS INTERPRETATION TEXT:
This is in response to your September 23, 1982, letter regarding the applicability of Federal Motor Vehicle, Safety Standard No. 118, Power-Operated Window Systems, to power sunroofs. The agency apparently has never previously addressed this question. Standard 118 specifies requirements only for power-operated window and partition systems. A power sunroof would be considered neither a "window" nor a "partition" and therefore would not be subject to the standard. Our standard was intended to apply to the typical power side windows and the power tailgate window of station wagons. The reference to "partitions" in the standard was adopted as part of the July 23, 1970, final rule establishing Standard 118 and was intended to assure that power-operated interior partitions, such as might be used in a taxi or a limousine, would comply. Although Standard 118 does not apply to power sunroofs, we strongly recommend that safety precautions along the lines of those established in that standard be incorporated in power sunroof designs. It appears possible that the types of accidents which the standard was intended to prevent could also occur as a result of the unsupervised operation of power sunroofs.
If you have any further questions to this matter, please contact us. Sincerely,
Original Signed by Frank Berndt Cheif Counsel
Mr. Frank A. Berndt Chief Counsel National Highway Traffic Safety Administration Room 5219 Nassif Building Washington, D.C. 20590
Dear Mr. Berndt: We sincerely request information concerning the interpretation of Federal Motor Vehicle Safety Standard No. 118: "Power Operated Window Systems" (49 CFR Part 571).
Nissan's question is whether or not the requirements of MVSS 118 are applicable to a power-operated sunroof.
Thank you in advance for your prompt attention to this inquiry. We are looking forward to an expeditious reply.
Sincerely,
Shizuo Suzuki Washington Representative Safety |
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ID: 1984-3.35OpenTYPE: INTERPRETATION-NHTSA DATE: 10/31/84 FROM: AUTHOR UNAVAILABLE; FRANK BERNDT; NHSTA TO: H.K. Porter Company, Inc. TITLE: FMVSS INTERPRETATION TEXT:
Mr. A. F. Netzer Hose Development Manager H.K. Porter Company, Inc. 1301 W. Sandusky Avenue Bellefontaine, Ohio 43311
Dear Mr. Netzer:
This responds to your September 19, 1984 letter to Mr. Vern Bloom of the National Highway Traffic Safety Administration (NHTSA) concerning Federal Motor Vehicle Safety Standard No. 106, Brake Hoses. Your letter was referred to this office for our reply. You asked whether Standard No. 106 would permit the manufacture of an air brake hose for use with permanently attached end fittings when the size of the hose is not listed in Table III of that standard. The answer to your question is yes. Table III of Standard No. 106 specified dimensional requirements for air brake hose intended for use with reusable end fittings. The table does not limit the sizes of hoses used with permanent fittings. He wish to emphasize that all other requirements applicable to air brake hoses which are found in Standard No. 106 would apply to your air brake hoses.
Sincerely,
Frank Berndt Chief Counsel
September 19, 1984
Mr. Vern Bloom U.S. Department of Transportation NHTSA NRM11 CAD 400 7th Street, Southwest Washington, D.C. 20590 Dear Sir:
We, as air brake hose manufacturers, have been requested by several customers to produce an air brake hose having an inside diameter as listed under SAE J1402 table "A" specification for permanently attached fittings. We find that the DOT 106 specification table "III" does not list a hose diameter for permanently attached fitting and would like to know if we would have any problems if we manufactured a hose with the dimensions as listed in SAE J1402 table "A".
Thank you very much, I remain
Very truly yours,
A. F. Netzer Hose Development Manager AFN/jah |
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.