Ключевые слова: background, blue, bright, change, cloud, cloud sky, cloudscape, cloudy, color, color image, colorful, communication, concept, control, danger, illuminated, intersection, lamp, light, looking up, low angle view, manufactured object, no people, outdoors, red, red light, red light image, road signal, safety, signal, signal lights, sky, space, stop, stoplight, street light, traffic lamps, traffic light, traffic light photo, warning,