In the earliest days of the automobile, roads was a chaotic experience, with pedestrians, bicycles, horses, and streetcars all competing with motor vehicles for right of way. LED Traffic light first began appearing at intersections in the United States in the 1910s. The first traffic lights only offered stop (red) and go (green), giving drivers no time to react when the light changed, leading to many collisions. The first three-light Traffic Signal light was patented in 1923 by African American inventor Garrett Morgan. The addition of the yellow light gave drivers the warning they needed to prepare for traffic to stop.