Interpretation ID: nht68-3.1

DATE: 05/17/68

FROM: AUTHOR UNAVAILABLE; David A. Fay; NHTSA

TO: Berliner Motor Corporation

TITLE: FMVSS INTERPRETATION

TEXT: Thank you for your letter of April 10, 1968, addressed to Mr. William H. Risteen, concerning the requirement for headlamp dimmer switches as specified in Federal Motor Vehicle Safety Standard No. 108.

Paragraph S3.4.1 of Standard No. 108 requires that a means for switching between lower and upper headlamp beams shall be provided in accordance with SAE Recommended Practice J564a or J565a. This general requirement is applicable to all vehicles, including motocycles, that are required, by Standard No. 106, to be equipped with lower and upper bean headlamps, even though SAE Recommended Practice J564a is addressed only to passenger cars.

Thank you for writing.