Interpretation ID: 1984-3.42

DATE: 11/21/84

FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA

TO: U.S. Suzuki Motor Corp.

TITLE: FMVSS INTERPRETATION

TEXT:

U.S. Department of Transportation

Mr. John B. Walsh Head, Regulations & Emissions Laboratory Government Relations Department U.S. Suzuki Motor Corp. 3251 East Imperial Highway Brea, California 92621

Dear Mr. Walsh:

This is in reply to your letter of October 31, 1984, to Mr. Vinson of this office, asking for confirmation of a 1972 agency interpretation of Motor Vehicle Safety Standard No. 108, Lamps, Reflective Devices, and Associated Equipment.

In pertinent part, Table III of Standard No. 108 requires that, at a minimum, a motorcycle be equipped with one taillamp, one stop lamp, and four turn signal lamps. Table IV directs that the stop lamp and taillamp be placed on the vertical centerline, and that the turn signal lamps be placed on each side of the vertical centerline with a minimum edge to edge separation distance of 4 inches between the turn signal lamp "and tail or stop lamp." Table IV expressly permits dual stop and taillamps "symmetrically disposed about the vertical centerline." No express exception is made to the 4-inch spacing requirement if dual stop or taillamps are installed, raising the question whether the minimum distance must be maintained no matter what the rear lighting configuration may be.

You have called to our attention an interpretation of July 1, 1972, that Motor Vehicle Programs of this agency provided Stanley Electric Company Ltd. In that instance the proposed rear lighting configuration consisted of two combination stop, turn signal, and taillamps placed on either side of the vertical centerline. The agency opined that the minimum separation distance was not applicable to combination lamps when there was "no tail or stop lamp mounted on the vertical centerline." You have asked for confirmation that this remains the agency's view.

As you have pointed out Suzuki's proposed design of a unit combining amber turn signal lamps with red stop and taillamps is similar to current passenger car practice where the minimum distance requirement does not exist. Therefore, this will confirm that the minimum edge to edge separation distance of 4 inches between turn signals and stop and taillamps applies when single stop and taillamps are installed on the vertical centerline, but not when dual stop and taillamps are installed on either side of the centerline.

Sincerely,

Frank Berndt Chief Counsel

U.S. SUZUKI MOTOR CORPORATION

October 31, 1984

Mr. Taylor Vinson Room 5219 Office of Chief Counsel, NOA-30 National Highway Traffic Safety Administration 700 Seventh Street, SW Washington, DC 20590

Dear Mr. Vinson:

Subject: Request for Confirmation of Interpretation -FMVSS 108

As we discussed by telephone on 31 October, this is to request confirmation that a July 1972 interpretation of FMVSS 108 applies to the motorcycle rear lighting configuration described below.

Table IV of FMVSS 108 requires that motorcycle rear turn signals be separated by 9 inches or more (centerline to centerline, and that minimum edge to edge distance from the turn signal to the tail or stop lamp be 4 inches or more. These requirements contemplate the typical motorcycle rear lighting configuration of a centrally located combination tail lamp/stop lamp and separate turn signal lamps on each side of the tail/stop lamp.

For some of today's wider motorcycles, however, we are contemplating a different rear lighting configuration, shown roughly in the enclosed sketch. This configuration would consist of a single lamp unit located near the outer edge of each side of the rear of the motorcycle. The inboard part of the lamp would be a red tail lamp/stop lamp combination, and the outboard part of the lamp would be an amber turn signal lamp. Turn signal lamp separation would typically be more than 24 inches, far exceeding the 9 inch minimum required by FMVSS 108, and providing clear indication of the direction of an intended turning maneuver. In essence, this rear lighting configuration is comparable to current practice in passenger car rear lighting.

In 1972, NHTSA indicated that

the minimum edge to edge separation distance of 4 inches is not applicable when the functions of tail, stop and turn are combined in a single lamp on each noneside of the motorcycle with no tail or stop lamp mounted on the vertical centerline.

A copy of this interpretation is enclosed for your reference. Based on this interpretation, Suzuki has designed a configuration as shown in the sketch. We would ask you to confirm that the 1972 interpretation would apply to the configuration shown, in recognition that it is meaningless to require a 4 inch separation distance where it is impossible because of the combined construction of the rear lamp units.

We would greatly appreciate your prompt attention to this request.

Sincerely,

U.S. SUZUKI MOTOR CORP.

John B. Walsh Head, Regulations & Emissions Laboratory Government Relations Department

JW:ej

Enclosure "SKETCH INSERT HERE"

July 1972 N41-34 Mr. H. Miyazawa Director, Automotive Lighting Engineering Department Stanley Electric Co., Ltd. 2-9-13, Nakameguro, Meguro-ku Tokyo 153, Japan Dear Mr. Miyazawa: This is in reply to your letter of July 5 concerning the requirements for stop and turn signal lamps on motorcycles. The answers to the questions you asked follow -- Question 1.

According to FMVSS 108 Table IV, it says, "minimum edge to edge separation distance between lamp and tail stop lamp is 4 inches." However, in the case of the above sketch where tail lamp, stop lamp and turn signal lamp are combined in one, can we ignore the above requirements of Table IV? The answer is yes; the minimum edge to edge separation distance of 4 inches is not applicable when the functions of tail, stop and turn are combined in a single lamp on each side of the motorcycle with no tail or stop lamp mounted on the vertical centerline. Question 2. Suppose the above lamp arrangement is acceptable, must each stop lamp meet the Class A turn signal lamp (red) -- SAE J575d, Table 1? Or, is complying the said requirements with the total of two lamps acceptable? The two stop lamps cannot be considered as multiple lamps, since it is required that the stop lamp be extinguished on the side when the turn signal is flashing. Each of the stop lamps must therefore meet the Class A photometric values specified in Table 1 of SAE J575d. Sincerely, Charles A. Baker for E. T. Driver, Director Office of Operating Systems, Motor Vehicle Programs