Interpretation ID: 1983-2.5

TYPE: INTERPRETATION-NHTSA

DATE: 05/11/83

FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA

TO: Truck-Lite Co. Inc. -- John E. Bennett, Director, Research & Engineering

TITLE: FMVSS INTERPRETATION

TEXT:

Mr. John E. Bennett Director - Research & Engineering Truck-Lite Co., Inc. 310 East Elmwood Avenue Falconer, New York 14733

Dear Mr. Bennett:

This in response to your letter of April 12, 1983, asking for interpretation of paragraph S4.6(b) of Motor Vehicle Safety Standard No. 108.

This paragraph states in pertinent part that "means may be provided to flask...side marker lamps for signalling purposes." You have first asked whether the rear side marker can be made to flash. You have also asked whether this language may be interpreted as allowing both front and rear side marker lamps to be flashed. The answer to both questions is yes. In the absence of restrictive language, paragraph S4.6 may be interpreted as allowing flashing of either front or rear side marker lamps, or both sets of lamps.

You have also asked whether, where the rear side marker and taillamp used the same optical source ("minor filament of a 1157 or similar bulb"), it is acceptable to have an overriding signal lamp is actuated. The answer is yes. The standard's prohibition against optical combinations (paragraph S4.1.1) does not preclude this design.

We hope that this answers you questions.

Sincerely,

Frank Berndt Chief Counsel

April 12, 1983

Attention: Office of Chief Counsel (Room 5219)

Subject: Request for interpretation of an element of FMVSS-108

Dear Sir:

In our endeavor to continue the advancements of vehicle lighting devices, which is a continuing assignment within our company, and offer specialized products to our customers with inherent benefits to the consumers, we have under consideration a new product which requires an interpretation of Section S4.6 Item (b), FMVSS-108, before we finalize our programs.

This section (S4.6) of FMVSS-108 requires.. "when activated:

a. Turn signal lamps, hazard warning signal lamps, and school bus warning lamps shall flash; and b. All other lamps shall be steady burning, except that means may be provided to flash headlamps and side marker lamps for signalling purposes."

Our questions are in reference to the rear side marker lamp and item (b) above. They are stated as follows:

a. Can the rear side marker be made to flash? Is Section S4.6, Item (b) to be interpreted as both front and rear side marker lamps may be flashed for signalling purposes? We know of only one current production (Jeep CJ) vehicle which the rear side marker lamp might be so viewed.

b. In a design where the rear side marker function and the rear tail lamp use the same optical source (minor filament of a 1157 or similar bulb), is it acceptable to have an overriding-flashing signal visible through the rear side marker lens when the signal lamp is actuated?

We are attempting to market a new product within the near future and do not wish to proceed until the above is cleared. Therefore we would appreciate your response to your questions as soon as possible.

Kindly accept our thanks for your prompt attention to this request. Do not hesitate to contact me if I can be of additional assistance.

Sincerely,

TRUCK-LITE CO., INC.

John E. Bennett Director - Research & Engineering JEB:h cc: R. Kotsi