Interpretation ID: nht72-2.22
DATE: 02/18/72
FROM: AUTHOR UNAVAILABLE; R. B. Dyson; NHTSA
TO: FMC Corporation
TITLE: FMVSS INTERPRETATION
TEXT: This is in reply to the questions you ask in your letter of January 7 concerning the Federal Motor Vehicle Safety Standards.
In your first question you ask whether a vehicular hazard warning signal operating unit must conform to SAE Recommended Practice J910 specified in Table 1 of Standard No. 106, or to the newer SAE J910s. The answer is J910; the revision J910a cannot become a requirement of Standard No. 103 without ruleasking action by this agency. As of (Illegible Words) has issued no proposal that (Illegible Word) be adopted. You also ask whether hazard lamps at both ends of the vehicle must flash simultaneously. The operating unit is defined in (Illegible Word) as a device "which causes all turn signal lamps to flash simultaneously . . ." This means that all turn signal lamps must flash on the same cycle, and that separate cycles for froat and rear turn signal lamps are not permissible.
In answer to your second question, Standard No. 108 does not yet specify requirements for side turn signal lamps, and thus does not prohibit their use on your motor home. As indicated in our "Program Plan for Motor Vehicle Safety Standards," October 1971, this agency intends to issue a notice in the near future proposing to incorporate requirements for side turn signal lamps in Standard No. 108
Finally you ask whether Standard No. 101 requires illumination (Illegible Words) handlamp switch with park ponition to operate clearance, I.D., and the marker lamps. Standard No. 101 does not require illumination of the headlamp switch, even if the switch does (Illegible Word) is the operation of other lamps whose controls, if separate, would have to be illuminated.