Interpretation ID: nht81-2.20

DATE: 05/06/81

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: J. G. Frail

TITLE: FMVSS INTERPRETATION

TEXT:

U.S. Department of Transportation National Highway Traffic Safety Administration

May 6, 1981 NOA-30

Mr. John G. Frail P.O. Box 581 Bronxville, New York 10708

Dear Mr. Frail:

This is in reply to your letter of April 9, 1981, to this agency asking, with respect to Motor Vehicle Safety Standard No. 108, "whether the minimum edge to edge separation distance between lamp and tail or stop lamp of 4 inches is measured outside of the lamp or inside of the lamp." You have asked this question in behalf of an "OEM supplier" in Germany.

The requirement in Table IV of Standard No. 108 is that the minimum edge to edge separation distance between a turn signal lamp and a tail or stop lamp be 4 inches while the turn signal lamps themselves must have a minimum separation distance of 9 inches between their centerlines. (Your design is somewhat confusing as it depicts centerlines of stop lamps and turn signal lamps at 9 inches.) We interpret this as meaning the minimum separation distance between the edge of lighted area to be 4 inches, as depicted in "B" in your design. Of course, final responsibility for compliance with this requirement rests on the vehicle manufacturer rather than the equipment manufacturer.

Sincerely,

Original Signed By

Frank Berndt Chief Counsel

John G. Frail Post Office Box 581 Bronxville, New York 10708

April 9, 1981

U.S. Department of Transportation National Highway Traffic Safety Administration Washington, D.C. 20590

Re: FMVSS 108 interpertation.

Gentlemen:

The attachment from the Federal Motor Vehicle Safety Standards and Regulations from ULO-WERK of West Germany questions the following:

The contents of the attachment are that of Table III & Table IV (Part 571; S 108 11/12). They are interested, as illustrated by the client, the interpertation as to whether the minimum edge to edge separation distance between lamp and tail or stop lamp of 4 inches is measured outside of the lamp or inside of the lamp.

They have not specified their concern other than being OEM suppliers. This question may have risen as a result of two manufacturers supplying the lamp for one vehicle. The outside ornamentation of the lamp may be the question resulting in how one should measure the distance. Also, if we assume the distance is basically for light output of the lamp (night time driving) they may have a reasonable question.

So that I may inform our client, please advise in writing the proper interpertation of the subject specification as to wether the measurement of 4 inches regarding the distance between tail-stop-lamp and indicator lamp will be measured at the inside or outside of the spare lens.

Please forward your answer to my above post office box address at your earliest convenience.

Very truly yours,

John G. Frail

Attachment Omitted