Columbia city officals anxiously tested the first new "mechanical signal" on Monday, November 6, 1922. The new device was located at the intersection of Gervais and Sumter. Officials announced that "the green light gives drivers the right of way and the red light calls for a stop". Four officers and a megaphone were available at the intersection to instruct "drivers of all kinds of vehicles."
The State November 6, 1922 p.7