Ключевые слова: adult, behavior, box, cab, car, challenge, city, competition, convert, district, driver, driving, employment, engineer, explore, focused, future, labor, life, man, move, parking, permit, pov, profession, railroad, rigor, rush, security, serious, sofia, standards, station, steam, test, track, trade, traffic, train, tram, transportation, travel, urban, visibility, walking, windshield,