Ключевые слова: allow, background, blue, change, check, city, cloud, color, colorful, concept, control, cross, crossroad, drive, environment, go, green, information, junction, light, no, object, protection, ready, recycling, red, safe, safety, semaphore, set, sign, signal, sky, space, stop, street, traffic, transportation, type, urban, warning, way, yellow, yes,