Ключевые слова: because, city, crossing, crossroad, danger, direction, europe, european, public, public transport, public transportation, red, road, road sign, roadsign, safety, security, sign, signal, stop, street, streetcar, symbol, traffic, traffic sign, train, tram, tram crossing, tram line, tram roadsign, tram xing, transport, transportation, urban, urbanism, warning, way, xing,