Whelen Traffic Advisor controller with red power switch, functio…

Close-up of a Whelen Traffic Advisor control head with a red POWER rocker switch (HIGH/OFF/LOW), a FUNCTION knob labeled LEFT/RIGHT/SPLIT/FLASH, and a row of amber DIRECTION INDICATOR LEDs; a Galls StreetThunder XL200 unit sits above.

AI caption June 2003 · Photo 3 of 26