Ключевые слова: access control, city transit, commuter, commuter transit, emergency signage, no entry, passenger, passenger safety, platform, platform safety, public transit, public transportation, restricted, restricted access, safety icon, safety sign, safety warning, station interior, station sign, subway, subway platform, train station, transit, transit network, transit station, transit system, transportation, travel, travel alert, travel experience, travel guide, travel safety, tube, tube network, tube platform, tube station, underground, underground railway, urban transit, urban transport, warning sign,