Ключевые слова: allow, ambergris, background, blue, change, city, color, colorful, concept, control, cross, drive, environment, go, green, highway, isolated, junction, lamp, light, no, object, ready, rejection, safety, saphenous, semaphore, set, sign, signal, sky, space, stop, stoplight, street, symbol, the cloud, the road, the transportation, traffic, trafficlight, transport, travel, tsar, urban, warning, way, white, yellow, yes,