Interpretation ID: 1982-2.40

DATE: 08/16/82

FROM: AUTHOR UNAVAILABLE; C. M. Price; NHTSA

TO: Ichikoh Industries, Ltd.

TITLE: FMVSS INTERPRETATION

TEXT:

AUG 16 1982

AIR MAIL

Mr. Fukuo Takata, Manager Certifications Regulations Section Ichikon Industries, Ltd. 80 Itado, Isehara City Kanagawa 259-11 JAPAN

Dear Mr. Takata:

This is in reference to your letter of June 30, 1982, to Mr. Elliott of this agency concerning the effective luminous lens area of a front turn signal lamp under Federal Motor Vehicle Safety Standard (FMVSS) No. 108 with respect to three proposed designs.

We assume that you wish to know what is the effective projected luminous lens area for a front turn signal on vehicles less than 80 inches in overall width. The SAE Standard No. J588e, "Turn Signal Lamps," which you quote, imposes no additional requirements for a two compartment front turn signal lamp. Thus, it appears that so long as you meet the minimum of 3.5 square inches for a single compartment lamp, your proposed designs (Case 1 and 2) meet the necessary requirements of FMVSS No. 108. Case 3 would not conform as neither of the two section compartments meets the 3.5 square inch minimum.

Sincerely,

Courtney M. Price Associate Administrator for Rulemaking

L57/30 June 30, 1982

Mr. Marx Elliott Program Manager Rulemaking National Highway Traffic Safety Administration 400 Seventh Street, S.W. Washington, D.C. 20590 U.S.A.

Subject: Effective projected luminous area of Front Turn Signal Lamp

Dear Mr. Elliott,

We would like to inquire as follows. FMVSS 108 references SAE J588e for turn signal lamps, and SAE J588e prescribe Effective Projected Luminous Area as follows.

SAE J588e

3.2 The effective projected luminous area of a single compartment lamp measured on a plane at right angles to the axis of a lamp must be at least 8.0 sq in. for a rear lamp and at least 3.5 sq in. for a front lamp.

3.3 If a multiple compartment lamp or multiple lamps are used to meet the photometric requirements of a rear turn signal lamp, the effective projected luminous lens area of each compartment or lamp shall be at least 3 1/2 sq. in. provided the combined area is at least 8 sq in.

That is, in the case of front turn signal lamp, section 3.2 provide that Effective Projected Luminous Area should be more than 3.5 sq in.

But when we want to take into account of two compartments of front turn signal lamp, may we understand that the following cases are acceptable for FMVSS 108.

*Insert artwork

Condition of Effective Projected Luminous Area

Area A Area B A + B

Case 1 >/3.5 in.2 >/3.5 in.2 >/3.5 in.2

Case 2

Case 3 < 3.5 in.2 <>/3.5 in.2

We await your early reply.

Very truly yours, ICHIKOH INDUSTRIES, LTD.

Fukuo Takata, Manager Certifications Regulations Section