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: aiam2677OpenMr. James Tydings, Thomas Built Buses, Inc., 1408 Courtesy Road, P.O. Box 2450, High Point, NC 27261; Mr. James Tydings Thomas Built Buses Inc. 1408 Courtesy Road P.O. Box 2450 High Point NC 27261; Dear Mr. Tydings: This responds to your September 15, 1977, letter asking severa questions pertaining to Standard No. 222, *School Bus Passenger Seating and Crash Protection*, and Standard No. 217, *Bus Window Retention and Release*.; You first ask whether side-facing seats installed in school buses fo purposes of transporting handicapped or convalescent passengers are exempted from the requirements of Standard No. 222. The answer to your question is yes. these seats are not considered school bus seats' as that term is defined in S4 of the standard. The remaining forward-facing seats installed in the same bus, however, would be required to comply with all of the requirements of the standard.; In a related matter, you ask what your responsibility would be should non-handicapped passenger use a handicapped passenger seat. The National Highway Traffic Safety Administration (NHTSA) realized when it adopted the limited seating exception applicable to seats for the handicapped that these seats might on occasion be used by non-handicapped passengers. The agency is continuing to study such problems in order to ensure that buses designed to accommodate handicapped passengers provide a sufficient level of safety for all individuals they routinely transport. Standard No. 222 does not place a responsibility upon school bus users to permit only handicapped students to sit in side-facing seats. Of course, any passenger seated in such a seat will not benefit from the protection provided by forward-facing seats that meet the requirements of the Federal standard.; In a final question, you ask whether the position of a wheelchair i close proximity to the rear emergency exit of a bus would violate S5.4.2.1(a) of Standard No. 217. The NHTSA will measure the opening using the described parallelepiped device as the vehicle is constructed in its unloaded condition. Since the wheelchair would not be present when the vehicle was in its unloaded condition, your location of the wheelchair would not violate the standard.; Sincerely, Joseph J. Levin, Jr., Chief Counsel |
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ID: aiam3965OpenMr. Tom Cooney, Executive Editor, Tire Review, 11 South Forge Street, Akron, Ohio 44304; Mr. Tom Cooney Executive Editor Tire Review 11 South Forge Street Akron Ohio 44304; Dear Mr. Cooney: This responds to your letter to Mr. Steve Kratzke of my staff, askin several questions about the removal of the DOT numbers from the sidewall of tires. In a February 5, 1985 telephone conversation with Mr. Kratzke, you stated that the answers to all of your questions except number 7 should address the situation only for tire dealers and distributors. With that limitation, I have set forth below the answers to each of your questions in the order presented in your letter.; 1. *Under what circumstances, if any, may a DOT number be removed fro a passenger car tire?*; There are no circumstances in which a tire dealer or distributor ca legally remove a DOT number from a passenger car tire. It is unclear when you refer to a 'DOT number' whether you are referring to just the tire identification number required to be on every new and retreaded tire by 49 CFR Part 574, or that identification number together with the DOT symbol. The DOT symbol is required to appear on all new tires for highway use and retreaded passenger car tires as a certification by the manufacturer or retreader that the tire fully complies with the applicable Federal safety standard.; In any case, Standard No. 109, *New pneumatic tires - passenger cars (49 CFR S571.109) applies to all new pneumatic tires for use on passenger cars manufactured after 1948. Section S4.3.1 requires that the symbol DOT be on the tire, and section S4.3.1 requires that the tire identification number be on the tire. Section 108(a)(2)(A) of the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1397 (a)(2)(A)) specifies '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 an...item of motor vehicle equipment in compliance with an applicable Federal motor vehicle safety standard...' By removing the DOT identification number, a dealer or distributor would be knowingly rendering inoperative an element of design on the tire which is included on the tire in compliance with Standard No. 109. Section 109 of the Safety Act (15 U.S.C. 1398) specifies a penalty of up to $1000 for each violation of Section 108. This agency would consider each tire from which the DOT number had been removed to be a separate violation.; 2. *If the answer to question 1 is none, is there any situation in which a passenger car tire can b sold for farm or off- road use provided that the DOT number has been removed?*; There is no situation in which a passenger car tire with the DOT numbe removed can be sold for any purpose. Section S6 of Standard No. 109 reads as follows:; S6 *Nonconforming tires*. No tire that is designed for use on passenge cars and manufactured on or after October 1, 1972, but does not conform to all the requirements of this standard, shall be sold, offered for sale, introduced or delivered for introduction into interstate commerce, or imported into the United States, for any purpose.; A passenger car tire without the DOT number does not conform to al requirements of the standard, so its sale for any purpose is expressly prohibited. A violation of this section would subject the seller to a potential penalty of up to $1000 for each nonconforming tire sold.; 3. *Under what circumstances can tires for use on motor vehicles othe than passenger cars have the DOT number removed and the tires sold for off-road or farm use only?*; This is really a two part question. Again, there are *no* circumstance in which a tire dealer or distributor can legally remove the DOT number from these tires. Standard No. 119, *New pneumatic tires for motor vehicles other than passenger cars* (49 CFR 571.119) applies to these tires. Section S6.5(a) requires the DOT symbol to be on those tires, while section S6.5(b) requires the tire identification number to be on the tires. Section 108(a)(2)(A) of the Safety Act prohibits tire dealers and distributors for removing those symbols from the tire, and the penalty for removing those symbols is up to $1000 for every tire from which the symbols are removed.; Section 108(a)(2)(A) also prohibits manufacturers from removing DO numbers from tires and then selling the tires to distributors as tires for off-road use. It is theoretically possible that a tire dealer or distributor could acquire a small quantity of tires from which the DOT number had been removed by a party other than a manufacturer, distributor, dealer, or motor vehicle repair business. Assuming that a tire dealer or distributor did acquire some of these tires from which the DOT number had been removed, the tires could be sold for off-road use only. This is because Standard No. 119 has no comparable provision to section S6 of Standard No. 109. However, these tires may never legally be sold for used on the public roads (15 U.S.C. 1397(a)(1)(A)). A tire dealer or distributor who acquires tires from which the DOT number has been removed would be well advised to have some written statement to that effect on the sales slip. The purpose of such statement would be to prove that it was not the tire dealer or distributor who removed those numbers. When selling these tires for off-road use, the dealer or distributor should have some means of proving that he or she sold these tires with the caveat that they could only be used off-road. Either of your suggestions in question 4 (noting off-road use only on the sales slip or having the customer sign a document that the tires will only be used off-road) would be helpful for the dealer or distributor.; 4. *If a tire can be sold as described in Question 3, what must a tir distributer or dealer do to sell a tire?*; As noted above, either of your suggestions would be helpful for th dealer or distributor selling tires exclusively for off-road use. What the dealer must be able to do when selling these tires is show that he or she was not selling tires which do not comply with Standard No. 119 for use on the public roads.; 5. *If a tire in Question 4 is sold with no-highway use intended an the customer uses it on the highway, will the tire dealer or distributor be held in violation of the provision provided he met the requirements for noting that the tire was sold for non-highway use only?*; If a tire dealer or distributor can show that he or she did not remov the DOT numbers from the tires and that he or she sold the tires with the express understanding that the tires could not be used on the public roads, the dealer or distributor would not have violated any Federal requirements.; 6. *Is it possible that if the tire in Question 5 fails on the highwa and causes property or personal injury as a result that the tire dealer or distributor could be held liable for the damages or injuries? Even if he did not mount the tire on a rim for the customer?* This is a question of state law, which I cannot answer. However, I can say that it would be helpful for the dealer or distributor to have some proof that the customer was clearly told that these tires did not comply with the applicable Federal safety standard and could not be used on the public roads.; 7. *Who, if anyone, is allowed to remove DOT numbers?* a) A tire manufacturer may remove DOT numbers from its tires, as a wa of showing those tires do not satisfy the applicable standard Once a manufacturer does this, this tires may not legally be sold.; b) A retreader may remove the DOT numbers on the casing he or she i retreading. The retreader is generally required to mark its own identification number on each tire it retreads.; c) Once a tire has been sold for purposes other than resale, any perso or entity, *other than a manufacturer, distributor, dealer, or motor vehicle repair business,* may remove any or all markings from the tire.; 8. *If a retreader is allowed to remove DOT numbers, is he required t replace the removed number with his assigned DOT shop code number?*; Generally speaking, the retreader is required to permanently mark tire identification number on the sidewall of each tire it retreads. 49 CFR 574.5 specifies: 'Each tire retreader...shall conspicuously label one sidewall of each tire he retreads by permanently molding or branding into or onto the sidewall...a tire identification number...' There are two minor exceptions to this provision. A tire retreader who retreads tires for his own use is not required to mark a tire identification number on those tires. Also tires which are retreaded exclusively for mileage contract purchasers are not required to bear the retreader's tire identification number if the tire contains the phrase 'for mileage contract use only' molded into or onto the tire sidewall. In all other instances, a retreader must mark its tire identification number on each tire it retreads.; 9. *Tire definition: since many tire sizes and styles are use interchangeably from passenger cars to light trucks and vans, especially mini-vans, how will the DOT decide whether Standard No. 109 or 119 applies to a case of DOT number removal and subsequent sale for off-road use?*; In the process of certifying their tires, manufacturers indicat whether that tire size is designated primarily for use on passenger cars or primarily for use on light trucks and multipurpose passenger vehicles (vans). This is occasionally done by an individual manufacturer for a particular tire size, but is most often done through the publications of standardization organizations. (A standardization organization is a voluntary association composed of representatives of each of the member tire companies. The purpose of these standardization organization is to establish and promulgate sound engineering standards for tires, rims, and their allied parts.) The agency uses these listings to determine whether a tire is certified for compliance with Standard No. 109 or No. 119. If you have any questions about particular tire sizes, you may wish to contact the American standardization organization, The Tire an Rim Association, at 3200 West Market Street, Akron, Ohio 44313.; 10. *Since DOT requires certain information to appear on the sidewal of the tire, whether passenger car or other type, what, if anything can be removed from the sidewall?*; A tire dealer or distributor can never legally remove any of th required information from the sidewall of tires. In the case of passenger car tires, the following information is required to appear on the sidewall: The size designation, maximum permissible inflation pressure, maximum load rating, the generic name of each cord material used in the plies of the tire, the actual number of plies in the sidewall and in the tread, the words 'tubeless' or 'tube type', the word 'radial' if the tire is a radial tire, the DOT symbol, the name of the manufacturer or the brand name, and the identification number. In the case of tires for use on motor vehicles other than passenger cars, the following information is required to appear on the sidewall: the DOT symbol, the tire identification number, the tire size designation, the maximum load rating and corresponding inflation pressure, the speed restriction of the tire if 55 mph or less, the actual number of plies and the composition of the ply cord material in the sidewall and in the tread, the word 'tubeless' or tube type', the word 'regroovable' if the tire is designed for regrooving, the word 'radial if the tire is a radial tire, and the letter designating the load range of the tire. Removal of any of these required items of information by a tire dealer or distributor would be a violation of section 108(a)(2)(A) of the Safety Act, as explained above in my answer to Question 1.; 11. a.*If a dealer is removing DOT numbers from tires then sellin those tires to a distributor who sells them to another dealer for resale to the customer, who is in violation of the Federal requirements?*; The answer to this question depends on whether the tires are for use o passenger cars or other motor vehicles. If the tires are passenger car tires, both dealers and the distributor have violated Federal requirements. The dealer removing the DOT numbers has violated Section 108(a)(2)(A) of the Safety Act, as explained in the answer to Question 1 above. The distributor and dealer selling tires which do not comply with the requirements of Standard No. 109 have violated section 108(a)(1)(A) of the Safety Act, as explained in the answer to Question 11.b below.; If the tires are for other motor vehicles, the dealer removing the DO numbers has violated section 108(a)(2)(A) of the safety Act. If the tire distributor and the dealer selling the tires to a customer can show that neither one removed the DOT numbers and that the tires were sold with the express understanding that they could not be used on the public roads, neither has violated any Federal requirement.; b. *If a customer buys tires with no DOT number and takes them t another dealer for mounting on his car, is that dealer in violation of Federal requirement because he mounted the tires, even though he did not sell them?*; Since this question deals with passenger car tires, a dealer mountin tires without DOT number would be in violation of Federal law. Section 1089a)(1)(A) of the Safety Act specifies, ' No person shall manufacture for sale, offer for sale, or introduce or deliver for introduction in interstate commerce, or import into the Unite States, any motor vehicle or item of motor vehicle equipment manufactured on or after the date any applicable Federal motor vehicle safety standard takes effect under this title unless it is in conformity with such standard...' A tire is an item of motor vehicle equipment, and a passenger car tire without DOT numbers is not in compliance with Standard No. 109. We have stated in previous interpretations that the use of noncomplying tires on pubic roads is an introduction of those tires in interstate commerce, and therefore a violation of this provision of the law. A dealer mounting noncomplying tires on a passenger car would also be considered to be introducing those tires into interstate commerce, and, therefore, also in violation of this provision.; 12. *Please sum up the intent of Standards No. 109 and 119 and indicat if the tire dealer or distributor has an obligation to report to DOT any tire dealer who is removing DOT number and/or other required sidewall information and then selling these tires. Also indicate how this would be done and what steps would follow?*; Standards No. 109 and 119 are intended to provide the tires purchase with necessary information for the safe operation of those tires on the purchaser's vehicle. Tire dealers and distributors cannot remove this information from the sidewall of the tires.; A tire dealer or distributor does not have a legal obligation to repor violations of these requirements, although we would appreciate if they did so. NHTSA prefers reports of violation to be in writing and addressed to: NHTSA, Office of Vehicle Safety Compliance, 400 Seventh Street, S.W., Washington, DC 20590. If for some reason the report cannot be made in writing, a person who suspects a violation of the requirements should telephone Mr. James Gilkey at (202) 426- 2834. When the agency learns of a violation, normal enforcement procedures are begun. First, the agency investigates to see if the allegations of violations are true. If the investigation concludes that there are violations, proceedings to collect the civil penalties are instituted against the violator. As noted above, a tire dealer or distributor removing DOT number from tires would face penalties of up to a maximum of $800,000 if the dealer or distributor had removed the DOT number for 800 or more tires.; If you have any further questions on this subject please contact Mr Kratzke a the above address or by telephone at (202) 426-2992.; Sincerely, Jeffrey R. Miller, Chief Counsel |
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ID: aiam1958OpenHonorable G. William Whitehurst, House of Representatives, Washington, DC 20515; Honorable G. William Whitehurst House of Representatives Washington DC 20515; Dear Mr. Whitehurst: A reply to your inquiry of June 5, 1975, concerning grade labellin regulations for new passenger car tires was transmitted to you on June 13 by Mr. James H. Cromwell of the Department of Transportation. Mr. Cromwell also referred your inquiry to me for additional comments.; As you are undoubtedly aware, the original impetus for th establishment of a uniform quality grading system for motor vehicle tires was provided by the National Traffic and Motor Vehicle Safety Act of 1966, which established this agency. The Congress, cognizant of the problems which beset the consumer when he attempts to make an informed choice of motor vehicle tires based on the relative merits of tire brands, included a specific Section 203 in the aforementioned Safety Act of 1966 which states that, 'In order to assist the consumer to make an informed choice in the purchase of motor vehicle tires . . .the Secretary shall . . . prescribe by order, and publish in the 'Federal Register*, a uniform quality grading system for motor vehicle tires.'; The benefits of such a system, while difficult to quantify, represen an enormous potential since some 200,000,000 motor vehicle tires are produced per year and are presently sold to consumers without adequate quantitative measures of their performance. It is expected that, by facilitating increased and more meaningful competition, the quality grading information will enable the tire consumer to obtain more value per dollar than he has in the past. The rule will enable the consumer to judge relative tire performance from a simple grading system, and thereby select a tire which provides him with the optimum solution to his driving needs.; For your review and information, I am enclosing a copy of the Unifor Tire Quality Grading Standards (UTQGS) which was issued in the *Federal Register* dated May 28, 1975. The rule provides quantitative grading measures for three important tire properties -- i.e., treadwear, traction, and temperature resistance.; I trust the above information satisfies your needs. Should you have an further questions, I shall be glad to attempt to provide answers.; Sincerely, Robert L. Carter, Associate Administrator, Motor Vehicl Programs; |
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ID: aiam4609OpenMr. H. Hasegawa Automotive Lighting Engineering Control Section Stanley Electric Co. Ltd.; Mr. H. Hasegawa Automotive Lighting Engineering Control Section Stanley Electric Co. Ltd.; FAX 03-792-0007 (Japan) Dear Mr. Hasegawa: This is in reply to your FA letter of May 22, l989, to Richard Van Iderstine of this agency. You have two questions with respect to the amendment to Standard No. l08 published on May 9, l989 (Docket No. 85-15, Notice 8). Your first question is the effective date of paragraph S7.7.5.1.(a), which you point out was not previously a requirement of Standard No. l08. You suggest the need for a delayed effective date (but give no reason why one may be needed). Paragraph S7.7.5.1(a) will be effective June 8, l989. Although the requirement is a new one (the restriction on motion of a headlamp when an external aiming device is applied to it), it was proposed as part of the December 29, l987 NPRM, and no comments received indicated a need for a delayed effective date. Your supposition is correct, S7.5.5.1 will apply to all headlamps with an external aiming system, including those incorporating replaceable bulbs. Your second question relates to paragraph S7.7.5.l(b), and you ask 'whether the requirement of '0.1 in. max.' will be determined, either during the test or after the test'. In pertinent part, subsection (b) states 'nor shall the lamp recede more than 0.1 in. (2.5 mm) after being subjected to an inward force....' This means that the measurement is determined after the test. Sincerely, Stephen P. Wood Acting Chief Counsel /; |
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ID: aiam3138OpenMr. K. W. Schang, Director, Vehicle Safety Programs, American Motors Corporation, 14250 Plymouth Road, Detroit, MI 48232; Mr. K. W. Schang Director Vehicle Safety Programs American Motors Corporation 14250 Plymouth Road Detroit MI 48232; Dear Mr. Schang: This responds to your letter of October 11, 1979, requesting ou opinion concerning the proper designated seating capacity of the rear seat in your 1981-model AMC Spirit.; You state that the planned 1981 Spirit rear seat will hav approximately 43 inches of hip room. The amended definition of designated seating position specifies that any position likely to be used as a seating position while the vehicle is in motion will be considered a designated seating position, and includes a caveat that bench or split-bench seats having greater than 50 inches of hip room shall have not less than three designated seating positions. Since the hip room in the rear seat of the 1981 Spirit will be well below the 50-inch caveat in the amended definition, and since you state that the rear seat will be contoured for two persons with distinct recessed areas for each person's buttocks, we conclude that this particular seat would qualify as a two-passenger seat. Under the definition, whether a particular position is 'likely to be used' is determined by the overall seat configuration and design and vehicle design. Given the limited amount of hip room and the configuration of the planned 1981 Spirit rear seat, it is not likely that more than two persons will occupy the seat.; Sincerely, Frank Berndt, Chief Counsel |
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ID: aiam4307OpenRobert A. Rogers, Director, Automotive Safety Engineering, Environmental Activities Staff, General Motors Corporation, General Motors Technical Center, 30400 Mound Road, Warren, MI 48090-9015; Robert A. Rogers Director Automotive Safety Engineering Environmental Activities Staff General Motors Corporation General Motors Technical Center 30400 Mound Road Warren MI 48090-9015; Dear Mr. Rogers: This responds to the letter (USG 2496) from Mr. David Martin concernin how the penetration resistance requirements of Standard No. 205, *Glazing Materials*, would apply to a piece of glazing that has two plys. I regret the delay in our response and hope the following discussion answers the questions raised by General Motors.; The letter explained that the glass manufacturing industry i continuing to develop new types of windshields to reduce facial lacerations. It further explained that a new type of glazing, referred to in the letter as '2-ply' glazing, has been developed which 'differs from the traditional High Penetration Resistant (HPR) windshield and the first generation antilacerative windshields in that it consists of one 'outer' glass ply and an 'inner' plastic laminate.'; The letter stated that there is a question about certifying an item o 2-ply glazing to the requirements of the penetration resistance test (Test No. 26 in ANS Z26.1) that is incorporated in Standard No. 205. In that test, a flat glass sample is supported in a wooden frame and must not allow a 5-pound steel ball to pass through it when the ball is dropped onto the supported sample from a height of 12 feet.; The letter further explains that, >>>When an HPR sample is laid on the wooden frame and the ball i dropped onto it, it cracks and bends somewhat but it is sufficiently rigid so as to remain on the text fixture frame and allow the test to measure its ability to resist penetration of the ball. However, when a 2-ply sample is tested in the traditional manner to Test No. 26, it cracks and bends sufficiently so that the glass test sample falls through the test frame. Thus, the test does not evaluate the ability of the sample to resist penetration of the ball, as is the stated intent of the test. On the other hand, if the traditional test method is appropriately adapted (such as clamping) to retain the 2-ply sample in the test frame, the test does, in fact, serve its intended purpose.'<<<; The letter requests the agency to adopt, by interpretation, modification of the test procedure to permit the retention of a piece of 2-ply glazing in the test frame.; Based on the information you have provided the agency, it appears tha the test procedure used in the penetration resistance test is not appropriate for the newly developed 2-ply windshield. As correctly noted in General Motor's letter, the purpose of the test is to determine whether an item of glazing has satisfactory penetration resistance. Because of (sic) 2-ply glazing material has more flexibility than conventional HPR glazing, the 2-ply material merely flexs (sic) and drops through the wooden test frame when it is struck by the steel ball. Thus, it is not possible to evaluate the penetration resistance of the 2-ply material in the same manner as conventional HPR glazing.; I do not, however, believe that the agency can adopt, b interpretation, a change in the test procedure you have requested. At present, the test procedure provides that the test sample is to be supported in a square wooden frame. The frame, as depicted in Figure 1 of ANS Z26.1, is made so that there is a 7/16 inch lip around the inside edge of the frame. The glass sample is placed inside the frame and supported by the lip during the drop test. The test procedure does not provide for clamping or otherwise holding the sample in place during the drop test.; To address the problem you have raised and to ensure objectivity in th drop test procedure, the agency believes it is necessary to amend the standard to establish uniform requirements for providing additional support to 2-ply glazing materials during the drop test. We will treat the General Motors letter as a petition for rulemaking to amend the standard to set a new test procedure for the impact resistance test. In considering possible amendments, we will carefully examine the work we understand is being done by the International Standards Organization on the clamping of test samples for the drop test.; If you have any further questions, please let me know. Sincerely, Erika Z. Jones, Chief Counsel |
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ID: aiam2379OpenMr. A. F. Hulverson, Vice President, Engineering, Fruehauf Division, Fruehauf Corporation, 10900 Harper Avenue, P.O. Box 238, Detroit, MI 48232; Mr. A. F. Hulverson Vice President Engineering Fruehauf Division Fruehauf Corporation 10900 Harper Avenue P.O. Box 238 Detroit MI 48232; Dear Mr. Hulverson: This responds to your August 17, 1976, question whether the 'no lockup requirement of S5.3.1 of Standard No. 121, *Air Brake Systems*, requires wheel sensors on both axles of a tandem axle system in those cases where the 'no lockup' performance is provided by means of an antilock system. Sections S5.3.1 (trucks and buses) and S5.3.2 (trailers) specify that the vehicle shall, under various load, road surface, and speed conditions, be capable of stopping; >>>. . .without lockup of any wheel at speeds above 10 mph, except for: (a) Controlled lockup of wheels allowed by an antilock system. . . (b)<<< This basic requirement is stated in performance terms, permitting manufacturer to choose any brake system design that will ensure that the wheels do not lock up under the specified conditions.; The exception to the 'no lockup' requirement set forth above permit 'controlled lockup of wheels allowed by an antilock system.' Manufacturers demonstrated, during the course of rulemaking, that properly functioning antilock systems might be designed to allow wheel lockup for a fraction of a second, and that antilock design should not be inhibited by a prohibition on all lockup. The agency made the 'controlled lockup' exception a part of the standard (36 FR 3817, February 27, 1971) and has subsequently interpreted the term to permit manufacturers latitude in the design of their systems.; In compliance with the basic requirement, most manufacturers hav equipped each axle of a vehicle with a valve to regulate the air pressure that applies the brakes, sensors at each wheel to send a signal when a wheel is locking up, and a logic module that receives the signals and instructs the valve when to release air pressure to prevent lockup ('axle-by-axle control'). Recently, some manufacturers have simplified their systems by utilizing only one valve and logic module to modulate the air supply to both axles of the typical tandem axle system found on many trucks and trailers ('tandem control'). Two approaches to wheel sensor placement have been used for tandem control systems. If it is possible to predict which of the two axles will lock first during braking, sensors may be placed on this axle only, knowing that reduced air pressure in response to a signal from the 'sensed' axle will also release the brakes on the 'unsensed' axle. In other cases, where it is not possible to predict which axle will lock first, tandem control systems may have sensors on all four wheels of the tandem.; In November 12, 1974, and March 7, 1975, letters of interpretation t Dana Corporation, the NHTSA confirmed that a manufacturer may choose the number of wheel speed sensors and logic modules that he includes in his antilock system. Thus, tandem control is not prohibited by the standard, regardless of the number of wheel speed sensors provided. When Dana asked if lockup on the unsensed axle of a single-axle sensor system would qualify for the 'controlled lockup' exception of the requirement, the agency said that it would not, reasoning that the logic module would not exert effective control over the lockup of the unsensed axle without benefit of input signals from wheels on that axle. Therefore, according to the Dana interpretation, the unsensed axle in a single-axle sensor system could not be allowed to lock at all, even momentarily, during the service brake stopping test. No data of actual performance was submitted with the Dana letter.; Your letter argues that the NHTSA's interpretation of 'controlle lockup' (to Dana Corporation) creates an anomalous and unjustified restriction on the use of 'tandem control.' Your submission, and data received by the agency from other interested persons, demonstrate that the Dana interpretation does not adequately reflect the degree of control which a single-axle sensor system actually can exert over the unsensed axle of a tandem system. Based on analysis of the submitted data, it appears that the amount of lockup permitted on unsensed axles is closely controlled by the available antilock systems. While there is a measurable difference in stopping performance between 'axle-by-axle' control and 'tandem control,' the standard already permits either of these means to satisfy the requirements. When the narrower question of the performance difference between sensors on one or both axles is analyzed, it is apparent that virtually no difference exists in the stopping distance of vehicles equipped these two ways. The effective lateral stability available during a stop also appears comparable regardless of placement of sensors on one or both axles. A technical report summarizing these findings will be placed in the public docket as soon as possible.; For this reason, and based on review of test data unavailable at th time of the Dana interpretation, the agency concludes that its interpretation of 'controlled lockup' in response to the question posed by Dana should be, and is hereby, withdrawn. It is the agency's interpretation that the 'controlled lockup' exception is not dependent on the number or location of sensors used in an antilock installation.; Sincerely, Frank A. Berndt, Acting Chief Counsel |
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ID: aiam0344OpenMr. Donald W. Taylor, Product Techniques Section Manager, SAAB-Scania of America, Inc., 100 Waterfront Street, New Haven, CT 06506; Mr. Donald W. Taylor Product Techniques Section Manager SAAB-Scania of America Inc. 100 Waterfront Street New Haven CT 06506; Dear Mr. Taylor:#This is in reply to your petition of March 12, 1971 for amendment of Motor Vehicle Safety Standard No. 101, *Control Location, Identification, and Illumination*.#You petitioned that the abbreviation for the defroster control identification be changed from 'DEF' to 'DEFR.' In the preamble to the reconsideration and amendment of Standard No. 101, (36 F.R. 8269, May 4, 1971), a copy of which I enclose, this agency noted that additional identifying words or symbols are permissible if they do not conflict with the required or permissible words and symbols set out in Standard No. 101. In our opinion your use of 'DEFR' would create no conflict.#You also petitioned that certain controls located below the drivers H point and available to all passengers be exempted from the control identification illumination requirement. The recent amendment to Standard No. 101 no longer required illumination of all heating and air conditioning controls, but only those that direct air directly upon the windshield. We believe this may be responsive to your petition.#Finally, you asked that we define our position on bilingual control identification. Identification in a language other than English is permissible, in the language of the preamble to the recent amendment, 'as long as the additional words . . . do not conflict with the required words . . .'#We hope this answers your questions.#Sincerely, Robert L. Carter, Acting Associate Administrator, Motor Vehicle Programs; |
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ID: aiam3991OpenMr. John A. Pachuta, Director, Bureau of Motor Vehicles, Commonwealth of Pennsylvania, Department of Transportation, Harrisburg, PA 17122; Mr. John A. Pachuta Director Bureau of Motor Vehicles Commonwealth of Pennsylvania Department of Transportation Harrisburg PA 17122; Dear Mr. Pachuta: Thank you for your letter of July 16, 1985, concerning Federal odomete disclosure requirements. You enclosed sample copies of the revised Pennsylvania Certification of Title (form MV-4 9-84 ) and the Dealer Assignment Covering a Vehicle Acquired and Held for Resale (form MV 9-82 ), to demonstrate that the signature of a purchaser is required in such transactions.; We appreciate Pennsylvania's efforts to assure purchasers' signature on title documents bearing odometer disclosures, as required by the Federal odometer statute (Title IV of the Motor Vehicle Information and Cost Savings Act) and the implementing regulations (49 CFR Part 580). Because the Bureau of Motor Vehicles requires the 'Dealer Assignment' form as an attachment to the Certificate of Title, no additional odometer disclosure statement is necessary if the vehicle is transferred within Pennsylvania.; However, if a vehicle is either retailed or wholesaled to a out-of-state purchaser, a separate odometer statement must still be executed, to assure that the purchaser acknowledges the odometer reading at the time of transfer, as required by 49 CFR S 580.4(e).; For your reference, I have enclosed copies of documents concerning a actual vehicle transfer from Pennsylvania to an out-of-state dealer which did not provide for a purchaser's signature. In that case, the seller (We Try Harder, Inc.) sold the vehicle to a Massachusetts dealer (J&R Whlsle), which in turned assigned the vehicle on a Massachusetts reassignment form. A later odometer reading was disclosed and acknowledged by a subsequent dealer-purchaser in New Jersey, but neither the Pennsylvania title nor the Massachusetts from provided for a signature to demonstrate that the intervening dealer-purchaser was aware of the odometer reading, as required by our regulations.; If it is not practical at this time to revise the Pennsylvania title t include the purchaser's signature prior to assignment or reassignment to an out-of-state party, I urge you to remind such transferors to issue a separate odometer disclosure statement.; Please feel free to contact Ms. Judith Kaleta of this offic (202/426-1834) if you have any questions concerning applicable Federal odometer disclosure requirements.; Sincerely, Jeffrey R. Miller, Chief Counsel |
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ID: aiam2683OpenMr. Donald H. Carter, 300 W. 11th Street, Reno, NV 89503; Mr. Donald H. Carter 300 W. 11th Street Reno NV 89503; Dear Mr. Carter: This is in response to your letters of August 24, 1977, and October 8 1977, concerning your Ford F-150 pickup truck.; The November 1976 date on your truck's certification label refers onl to the date of actual manufacture of the vehicle, not its model year. Virtually all manufacturers, including Ford, utilize a model year which does not correspond to the calendar year. Typically, for American manufacturers, this model year begins on September 1 of the previous calendar year, i.e., model year 1977 began on September 1, 1976. Manufacturers usually begin manufacture of their vehicles as early as July in order to have sufficient vehicles in their showrooms by the September start of the model year.; All Federal motor vehicle safety standards specify a date on whic their requirements become effective. Thus, a manufacturer must indicate by the certification label that its vehicles are in compliance with all Federal standards in effect on the date of the vehicles' manufacture. Whether a vehicle is marketed as a particular model year vehicle depends upon the manufacturer's own marketing practice. The certification date does not represent the model year date.; Finally, your first letter stated that your vehicle was ordered o November 4, 1976, with a 3 month delivery interval. Every manufacturer produces a large number of vehicles before there are orders for a specific vehicle, and maintains them in various storage locations around the country. When the manufacturer receives an order from a dealership for a specific vehicle, it will first determine whether it already has such a vehicle in stock, and if it does, it will ship that vehicle rather than specially manufacture a new vehicle.; However, if there is no identical vehicle in stock, it will manufactur one specifically for that order, which can take from a few days to several months to program into the assembly line and produce. As a dealership has no way to know in advance whether the vehicle it ordered is in stock or will have to be specially manufactured, it will often state a delivery date that anticipates the longest possible delay which would result from special manufacture. There is thus no reason for concern over the fact that your vehicle was manufactured in the same month it was ordered. Either Ford had such a vehicle in stock, or was able to manufacture one with very little delay.; I hope that this letter has answered your concerns. Sincerely, Joseph J. Levin, Jr., Chief Counsel |
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.