Interpretation ID: nht91-2.5

DATE: February 28, 1991

FROM: Z. Taylor Vinson -- Senior Staff Attorney, NHTSA

TO: Files: Interps. Std. 108; Redbook (3)

TITLE: Re Interpretation Letter to Oshkosh

TEXT:

On February 14, 1991, John Calow, Senior Safety Engineer, Oshkosh Truck Corp. (414-255-9151 ext. 2038) telephoned me about the agency's letter of January 16, 1991, with respect to override of the stop signal by the turn signal.

Our letter assumed that turn signals and hazard warning signals (which operate through the turn signal lamps) have a common circuit, and implied that the hazard signals must also override the stop signals when stop signals are optically combined with turn signals. Mr. Calow asked whether the override would be required if the hazard signal were on a separate circuit. I informed him that the override would not be required because the SAE requirement relates only to turn signal lamps.