Ключевые слова: access, accessibility, airport, allowed, automatic, barrier, boundary, business, card, center, city, closed, control, door, doorway, electronic, enter, entrance, entry, exit, gate, gateway, hall, leaving, line, machine, metro, modern, nobody, open, passage, portal, public, railroad, security, sign, speed, station, stop, subway, symbol, system, technology, ticket, tourniquet, transportation, turning, turnstile, underground, verification,