Ключевые слова: allow, background, blue, blue sky, car, change, city, cloud, color, concept, control, controler, controller, crossroad, danger, go, green, isolated, light, object, ready, red, road, safe, safety, semaphore, sign, signal, sky, stop, stoplight, street, symbol, traffic, traffic light, traffic lights, trafficlight, transportation, travel, urban, warning, way, yellow,