Ключевые слова: accident, architecture, bologna, building, careful, caution, central, central station, city, clean, danger, europe, european, fall, floor, hazard, interior, italia, italy, maintenance, modern, nobody, plastic, precaution, public, railway, risk, safety, sign, signal, slip, slippery, station, style, symbol, tourism, train, train station, transport, transportation, travel, urban, waiting, warning, wet, yellow,