Ключевые слова: access, authorization, automatic, barrier, boundary, business, card, closed, control, detector, door, electric, electronic, enter, entrance, entry, equipment, exit, gate, gateway, metal, metallic, metro, modern, nobody, open, pass, passage, passageway, passenger, platform, protection, public, red, safety, security, shiny, sign, station, steel, stop, subway, symbol, system, technology, ticket, tourniquet, transportation, turnstile, way,