
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: nht90-2.29OpenTYPE: Interpretation-NHTSA DATE: April 25, 1990 FROM: Stephen P. Wood -- Acting Chief Counsel.,NHTSA TO: Dipl.-Ing. H. Westermann -- Hella KG Hueck & Co. TITLE: None ATTACHMT: Attached to letter dated 2-21-90 To Taylor Vinson and From Dipl.- H. Westermann; (OCC 4484); Also attached to letter dated 2- 7-90 To Richard van Iderstine and From Dipl.- H. Westermann. TEXT: This is in reply to your letter of February 21, 1990, to Taylor Vinson of this office, requesting an interpretation of Motor Vehicle Safety standard No. 108 with respect to whether two designs for center highmounted stop lamps (CHMSL) you enclosed are permissible. You wish to know whether tbe ECE definition of "lamp unity" can be applied, and whether the designs form a CHMSL unity in the sense of Standard NO. 108. The question, as we see it, is not whether the ECE definition can be applied, but whether the two designs you submitted would meet the clearly expressed requirements of standard No. 108. The standard requires that there be a single lamp, that it have an effective projected luminous area of not less than 4 1/2 square inches, that its signal be visible through a horizontal angle from 45 degrees to the left to 45 degrees to the right of the longitudinal axis of the vehicle, and that it provide specified minimum photometric values at 13 specific test points. The design represented in Enclosure 1 appears to pass through the center of the lamp, at the H-V test point, thus affecting compliance of the lamp. Measurement at test points can only be determined by photometric testing. The design represented in Enclosure 2 would not comply with the standard. It is, in effect, two lamps mounted symmetrically about the vertical centerline. standard No. 108 requires a single lamp, to be mounted on the vertical centerline. |
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ID: nht90-2.3OpenTYPE: INTERPRETATION-NHTSA DATE: APRIL 8, 1990 FROM: STEPHEN P. WOOD -- ACTING CHIEF COUNSEL, NHTSA TO: HERBERT E. STOEL TITLE: NONE ATTACHMT: LETTER DATED 2-1-90 TO JOHN WOMACK FROM HERBERT E. STOEL ATTACHED; (OCC-4406). ALSO ATTACHED LETTER DATED 12-30-87 TO KEN SIKKEMA FROM HERBERT E. STOEL. TEXT: This is in reply to your letter to John Womack of this office, suggesting that the color of taillamps on motor vehicles be green. The agency is concerned about methods to effectively improve rear lighting and signaling. The issues involved include lamp size, location, operation, combinations and separation, and color. We are learning that changes in lamp function, operation, and c olor should be approached in a conservative fashion, so as not to confuse the operators of other vehicles. With specific respect to use of the color green on rear lighting equipment, we are aware that some research suggests a green/red color scheme may enhance driver performance. In such systems, a green lamp indicates that the accelerator pedal is applied, amber that the foot has been lifted from the accelerator pedal, and red, that the brake is being applied. Some years ago, an experiment was conducted with such a system using transit buses in the D.C. area. The results were inconclusive. Although some research suggests a possible improvement in driver performance with green/red lamps, there are no data addressing the possible driver confusion that might arise from multiple color lighting arrays. Thank you for your suggestion to enhance motor vehicle safety. |
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ID: nht90-2.30OpenTYPE: INTERPRETATION-NHTSA DATE: 04/25/90 FROM: STEPHEN P. WOOD -- NHTSA ACTING CHIEF COUNSEL TO: LARRY F. WORT -- BUREAU OF SAFETY PROGRAMS DIVISION OF TRAFFIC SAFETY ILLINOIS DEPARTMENT OF TRANSPORTATION TITLE: NONE ATTACHMT: LETTER DATED 03/27/90 FROM LARRY F. WORT -- ILLINOIS DEPARTMENT OF TRANSPORTATION TO TAYLOR VINSON -- DOT; OCC 4613; FORD RATIONALE FOR FMVSS 108 COMPLIANCE BY CLARKS GORTA -- FORD DATED 03/19/90 TEXT: This is in reply to your letter of March 27, 1990, to Taylor Vinson of this Office with respect to Federal requirements for front side marker lamps on trucks. The Ford C-CT Series Cab is equipped with a reflex reflector (apparently mounted on the door, to judge by the Exhibit A that you enclosed), but does not have a separate front side marker lamp. Ford states that it uses "the roof mounted corner marker lamps to satisfy the side marker lamp requirements", and that they satisfy photometry and all oth er Federal requirements. You have asked whether "the top of the cab clearance light [may] be used to fulfill the requirements for front side market lights. . . on cab over engine vehicles." The answer is yes. Federal Motor Vehicle Safety Standard No. 108, Lamps, Reflective Devices, and Associated Equipment, does not prohibit combining the front side marker lamp with any other lamp, and prohibits a front clearance lamp only from being optic ally combined with a front identification lamp (section S5.4, formerly S4.4). Although, under Table II of Standard No. 108, Location of Required Equipment, a front side marker reflector may not be mounted higher than 60 inches from the road surface, the re is no corresponding limitation on the mounting height of front side marker lamps, which would preclude it from being located on top of the cab. The marker lamp must be located "as far to the front as practicable", and the agency generally defers to t he manufacturer's discretion in determining whether a location is practicable, unless it is clearly erroneous. Judging by the location of the combination clearance-side marker lamp shown in Exhibit A that you enclosed, we have no reason to question Ford 's decision to locate the lamp there. I hope that this answers your question. |
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ID: nht90-2.31OpenTYPE: INTERPRETATION-NHTSA DATE: 04/25/90 FROM: RAYMOND D. STRAKOSCH -- PRESIDENT SAFETY PREMIUMS TO: JOHN MESSERA -- NHTSA TITLE: AUTOMOBILE TRIANGLE DEVICE AUTOMOBILE TRIANGLE DEVICE ATTACHMT: ATTACHED TO LETTER DATED 06/05/90 FROM STEPHEN WOOD -- NHTSA TO RAYMOND D. STRAKOSCH -- SAFETY PREMIUMS, ON A 35, STD 125 TEXT: One of your associates provided us with a copy of the Motor Vehicle Safety Standard #125 while you were away from the office. The standard was called to our attention since we have marketed for years a Signal Glo Car Mirror warning device, as described in the enclosed literature. Included in those products were two different triangle shapes. One of our customers, who is in the retail automotive trade, has asked us to develop a larger size warning triangle for mounting on a car mirror for possible retail sales. As our triangle gets larger, we wish to make sure that it is not confused with the roadside truck version described in the Standard #125. In addition, we would like to make sure that our instructions for use are clear and in no way conflict with the sta ndard. A sample of our earliest Signal Glo triangle, and our prototype new larger size "Light at Nite" Reflective Auto Triangle are enclosed for your information. We would appreciate any comments or assistance you may be able to give us. [BROCHURE OMITTED] |
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ID: nht90-2.32OpenTYPE: INTERPRETATION-NHTSA DATE: April 25, 1990 FROM: Peter K. Brown -- President, KC HiLites, Inc. TO: Chief Counsel -- NHTSA TITLE: None ATTACHMT: Attached to letter dated 7-2-90 to Peter Brown from Paul J. Rice; (A35; Std. 108) TEXT: I am writing for your comments and approval regarding an Automotive Lighting product that our company intends to market. The headlight systems on many late model vehicles operate differently than in the past. The low beams are extinguished when the high beam units are in use. This was done to reduce the foreground light of the low beams when the high beams are in use. I n actual use, having both systems operating in the high beam mode is superior. With this in mind, I have studied paragraph 5.5.8 of the Federal Register Volume 54, No. 88 dated May 9, 1989. I interpret this to mean that headlights of a specific type, when used in a 4 headlight system, can all be illuminated at the same time on Hig h Beam. The intended packaging, product and retail header card are enclosed for your inspection. I welcome any suggestions or comments that you may have. As these are prototype packages, will you please return them with your comments. Our product catalog is enclosed to give you some idea of our company and products. Thanks for your help. |
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ID: nht90-2.33OpenTYPE: Interpretation-NHTSA DATE: April 26, 1990 FROM: Stephen P. Wood -- Acting Chief Counsel., NHTSA TO: Joan E. Fogelman -- Lund & Pollara, Inc. TITLE: None ATTACHMT: Attached to letter dated 4-2-90 To Taylor Vinson and From Stephen P. Wood; (OCC 4602) TEXT: This is in reply to your FAX of April 2, 1990, to Taylor vinson of this Office, with reference to a 1985 Mercedes-Benz 280SE sedan being imported from the Bahamas temporarily, for the purpose of repair. You have stated that "U.S. Customs wants a reassura nce that they will not be held accountable if for some unforseen happening, this vehicle is not properly exported." Although the new DOT vehicle importation regulations effective January 31, 1990, make no specific provision for temporary importation of a nonconforming motor vehicle for repairs, when such a vehicle is owned by a nonresident of the United States and reg istered in a country other than the U.S., it is acceptable to this agency for the nonresident owner to enter it under the provisions of 49 CFR 591.5(d), the declaration by an importer who provides his passport number and country of issue that he is a non resident importing the vehicle for personal use for a period not to exceed one year and will not sell the vehicle during that time. Such an entry is not accompanied by the new DOT conformance bond, which is required only for entries pursuant to 591.5(f) and (g). I do not know what Customs means by being held "accountable" if the vehicle is not properly exported. You have stated that it will be accompanied by a Customs bond, and I assume that if the terms of that bond are violated Customs will take whatever enfor cement action against the vehicle and its owner is deemed appropriate under the bond. |
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ID: nht90-2.34OpenTYPE: INTERPRETATION-NHTSA DATE: 04/26/90 FROM: KENNETH E. TOMPOR -- AUTO BROKERS AND LEASING LTD TO: STEPHEN P. WOOD -- NHTSA TITLE: IMPORT OF 1985 FERRARI 288 GTO AS OF TODAY, APRIL 26, 1990 ATTACHMT: ATTACHED TO LETTER DATED 04/30/90 FROM STEPHEN P. WOOD -- NHTSA TO KENNETH E. TOMPOR; REDBOOK A35; PART 593; LETTER DATED 06/19/89 FROM KEN TOMPOR -- AUTO BROKERS AND LEASING TO JOSEPH THRASHER -- NEWPORT BEACH POLICE DEPARTMENT TEXT: IN 1988, I PURCHASED FROM A MR. RAYMOND DEANGELO IN LOS ANGELES CALIFORNIA THE ABOVE MENTIONED FERRARI, SERIAL #54245. THE CAR WAS PAID FOR ON OCTOBER 10, 1988 AND WHILE TRANSPORTATION WAS BEING ARRANGED TO MYSELF IN MICHIGAN, MR. DEANGELO REMOVED THE V EHICLE FROM MY LOS ANGELES STORAGE AREA "AS HE CHANGED HIS MIND". THE VEHICLE AND MONIES HAVE NOT BEEN RETURNED, AND AS YOU MAY HAVE GUESSED A LAWSUIT WAS INITIATED. MY COURT CASE AGAINST MR DEANGELO WILL BEGIN TUESDAY, MAY FIRST, IN FEDERAL COURT, AND I NEED AT THAT DATE A LETTER STATING THAT THAT VEHICLE TODAY CANNOT BE BROUGHT INTO THE UNITED STATES LEGALLY. WE ARE SUEING TO GET THE VEHICLE, NOT MONETARY DAMAGES, AND NEED TO SPECIFY THE UNIQUENESS OF IT IN THAT IT CANNOT BE REPLACED LEGALLY TODAY. MR. TAYLOR VINSON HAS GIVEN ME YOUR NAME AND ASSURED ME THAT YOU WOULD BE SO KIND AS TO FURNISH ME WITH A LETTER TO SUBSTAINIATE THIS STATEMENT. I WOULD APPRECIATE FAX-BACK ON MONDAY 4-30, AS CASE BEGINS ON MAY 1, 1990 THANKING YOU IN ADVANCE, I REMAINI N 1988, I PURCHASED FROM A MR. RAYMOND DEANGELO IN LOS ANGELES CALIFORNIA THE ABOVE MENTIONED FERRARI, SERIAL #54245. THE CAR WAS PAID FOR ON OCTOBER 10, 1988 AND WHILE TRANSPORTATION WAS BEING ARRANGED TO MYSELF IN MICHIGAN, MR. DEANGELO REMOVED THE VE HICLE FROM MY LOS ANGELES STORAGE AREA "AS HE CHANGED HIS MIND". THE VEHICLE AND MONIES HAVE NOT BEEN RETURNED, AND AS YOU MAY HAVE GUESSED A LAWSUIT WAS INITIATED. MY COURT CASE AGAINST MR DEANGELO WILL BEGIN TUESDAY, MAY FIRST, IN FEDERAL COURT, AND I NEED AT THAT DATE A LETTER STATING THAT THAT VEHICLE TODAY CANNOT BE BROUGHT INTO THE UNITED STATES LEGALLY. WE ARE SUEING TO GET THE VEHICLE, NOT MONETARY DAMAGES, AND NEED TO SPECIFY THE UNIQUENESS OF IT IN THAT IT CANNOT BE REPLACED LEGALLY TODAY. MR. TAYLOR VINSON HAS GIVEN ME YOUR NAME AND ASSURED ME THAT YOU WOULD BE SO KIND AS TO FURNISH ME WITH A LETTER TO SUBSTAINIATE THIS STATEMENT. I WOULD APPRECIATE FAX-BACK ON MONDAY 4-30, AS CASE BEGINS ON MAY 1, 1990 THANKING YOU IN ADVANCE, I REMAIN |
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ID: nht90-2.35OpenTYPE: Interpretation-NHTSA DATE: April 27, 1990 FROM: Kent D. Smith TO: Stephen P. Wood -- Acting Chief Counsel, NHTSA TITLE: None ATTACHMT: Attached to letter dated 9-10-90 from P.J. Rice to K.D. Smith (A36; Std. 108); Also attached to Federal Register, 49 CFR Ch. V (10-1-89 Edition), pages 137, 138, 139, and 140 (text omitted) TEXT: I appreciated your response to my letter (locater number #4387). In my initial letter to you I described a device that could be used to inform following vehicles that their headlights were blinding you and that they needed to put them on low beam. This device consisted of a button that would activate the backup lights momentarily and would send the same message to the following driver as blinking the headlights up and down does to inform oncoming cars that they needed to dim their lights. At the present time there are three methods that people use to inform following vehicles that their high beam in your rear view mirrors are making it difficult for you to drive. Some try taping their brakelights. This method is not effective because it is more universally accepted to mean that the following driver is tailgating. Another method which was pointed out in the cartoon that you sent me was that you slow down, let the offending driver pass and then put your lights on high and give him a tast e of his own medicine. This may make you feel better but it doesn't take care of the problem when it is happening. The most extreme method, but the one that gets the message across better than the other two, is what many truck drivers have done and in some cases people in private vehicles. In the case of truckers some have attached a spot light to their side mirror and when the following vehicle doesn't dim his lights he gives him a blast in the eyes with the spot light. The message is clear but it' s a dangerous way of putting the point across because of it's blinding effect on the driver of the following vehicle. I realize that my device need not be a mandated part of newly manufactured cars but I believe that it has a place as an option for new cars as well as an after market item. There was some concern on your part that this device "might" impair the effectiv eness of the lighting equipment that Standard No. 108 allows. Over the past number of years there have been several new devices added to the rear lighting system that have been an enhancement and not an impairment. Three of them that I have in mind are the turn signal, the four way emergency lights, and the brake light that is placed in the rear view window. I suppose that at the beginning there was some question as to what they meant but it didn't take the public long to understand the message they were trying to convey. I believe that the public would be equally as fast understanding the message that the "rear high beam awareness light" was trying to convey. A Federal Standard, SAE J593e 4.2, states that "Backup lamps shall not be lighted when the vehicle is in forward motion". I believe that the intent of this law is to force people to repair their backup light system when the lights are stuck in an on pos ition. With my safety device the backup lights would go on and off in a matter of a second or two so it would seem to me that the spirit of this law would not be violated. I feel that this would be a safe way of eliminating an annoying problem (high beams in your rear view mirrors) that up to now has not been resolved. What steps would have to be taken in regards to this SAE Standard that would permit me to test market this product? In your legal opinion would I be in violation of any Federal Law by manufacturing and selling this device? I again thank you for your time and patience and look forward to hearing from you in the near future. Please send your reply to: Kent D. Smith 12249 S. 1565 E. Draper Utah 84020 P.S. To save you the time of looking it up I'm enclosing my previous letter sent to your office Jan. 26, 1990. (Locater # 4387) |
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ID: nht90-2.36OpenTYPE: INTERPRETATION-NHTSA DATE: 04/30/90 FROM: STEPHEN P. WOOD -- NHTSA ACTING CHIEF COUNSEL TO: KENNETH E. TOMPOR -- AUTO BROKERS & LEASING LTD. TITLE: NONE ATTACHMT: LETTER DATED 04/26/90 FROM KENNETH TOMPOR TO STEPHEN P. WOOD -- NHTSA; RE IMPORT OF 1985 FERRARI 288 GTO AS OF TODAY, 04/26/90; OCC 4706; LETTER DATED 06/19/89 FROM KEN TOMPOR -- AUTO BROKERS AND LEASING TO JOSEPH THRASHER -- NEWPORT BEACH POLI CE DEPARTMENT TEXT: This is in reply to your FAX of April 26, 1990. You would like a statement from this agency, for purposes of litigation that commences on May 1, that a 1985 Ferrari 288 GTO cannot be legally imported into the United States. Pursuant to amendments made to the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1381 et seq.) by P.L. 100-562, the Imported Vehicle Safety Compliance Act of 1988, a motor vehicle not originally manufactured to conform to the Federal motor veh icle safety standards, cannot, subject to the exception noted below, be imported permanently into the United States on and after January 31, 1990, unless the Administrator of the National Highway Traffic Safety Administration has determined that it is ca pable of being readily modified to conform to all applicable Federal motor vehicle safety standards, or that its safety features comply with or are capable of being modified to comply with all such applicable standards. The Administrator has made no det ermination with respect to the 1985 Ferrari 288 GTO. However, no such determination is necessary if the following criteria are met at the time of importation. The importer's assigned place of employment was outside the United States as of October 31, 1988, and (she) has not had an assigned place of employment between that time and the entry of the motor vehicle. The importer has not previously imported a motor vehicle into the United States before October 31, 1988, that was not in compliance with all applicable Federal motor vehicle safety standards. The importer had acquired (or had entered into a binding c ontract to acquire) the motor vehicle before October 31, 1988. The vehicle must be entered not later than October 31, 1992. Only if an importer meets these criteria may (she) at the present time legally import a nonconforming 1985 Ferrari 288 GTO into the United States (subject, of course, to the obligation to bring it into compliance with the safety standards after its entry ). Sincerely, |
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ID: nht90-2.37OpenTYPE: INTERPRETATION-NHTSA DATE: 05/01/90 FROM: BRAD MAGOR TO: DEPARTMENT OF TRANSPORTATION OFFICE OF VEHICLE SAFETY COMPLIANCE ENFORCEMENT TITLE: NONE ATTACHMT: ATTACHED TO LETTER DATED 06/28/90 FROM PAUL JACKSON RICE -- NHTSA TO BRAD G. MAGOR; A35; PART 591 TEXT: We are moving back to the States (S.C.) from Canada in the near future. Ideally, we would like to buy a truck or van up here to help us with our move, though we don't want to get stuck with a vehicle that we can't use or eventually sell in the States. C ould you give us any information on what features cars or trucks require to meet U.S. safety standards. Do you know if Canada or Canadian cars generally have these items. Thank you very much for this information and your assistance. |
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.