Interpretation ID: 1984-1.9

TYPE: INTERPRETATION-NHTSA

DATE: 02/02/84

FROM: AUTHOR UNAVAILABLE; Barry Felrice; NHTSA

TO: Yamaha Motor Corporation

TITLE: FMVSS INTERPRETATION

TEXT:

Michael J. Schmitt, Counsel Yamaha Motor Corporation, USA 6555 Katella Avenue Cypress, CA 90630

Dear Mr, Schmitt:

This is in response to your letter asking for an interpretation, of the permissibility of using two type 2A1 headlamps mounted symmetrically disposed about the vertical centerline of the motorcycle.

Federal Motor Vehicle Standard (FMVSS) No. 108, "Lamps, Reflective Devices, and Associated Equipment states in S4.1.1.34 that a motorcycle may be equipped with one of the following headlamp systems, one of which is the "A" type neadlamp system described as follows:

Type 1A1 or Type 1A . . . . 1 lamp and either Type 1A1 or Type 2A . . . . 1 lamp

The standard is specified this way because the 2A1 lamp is a lower beam lamp and the 1A1 is an upper beam lamp. While the 2A1 lamp does have an "upper beam", photometrically it provides only "fill-in" light. The 1A1 lamp provides the high output upper beam. It is not possible to achieve safe upper beam light using only the 2A1 lamp, regardless of how many are used. Therefore, your proposed headlighting application would not be permitted by FMVSS No. 108.

Sincerely, Barry Felrice Acting Associate Administrator for Rulemaking

November 21, 1983

Mr. Charles Kaehn Head, Lighting and Visibility Group National Highway Traffic Safety Administration 400 Seventh Street, S.W. Washington, D.C. 20590

RE: FMVSS 108

Dear Mr. Kaehn,

Yamaha would like to incorporate a headlamp system featuring two type 2A1 headlamps. The lamps will be symmetrically disposed about the vertical centerline of the motorcycle. Is such a system permissible? We appreciate your assistance and response in this matter.

Sincerely,

Michael J. Schmitt Counsel

MJS/ts

cc: Shin Kubono