Ключевые слова: accessibility, airport, allowed, automatic, boundary, business, card, closed, contemporary, control, door, doorway, electronic, enter, entering, entrance, equipment, exit, gate, gateway, identity, inside, leaving, locations, machine, metallic, metro, office, open, passage, people, public, railroad, reader, safety, security, sign, station, steel, subway, system, technology, ticket, train, transport, transportation, travel, turnstile, underground, verification,