Ключевые слова: background, billet, blue, brussels, bus, cards, concept, journey, lille, london, luxembourg, metro, metro ticket, mobile, mobility, multiple tickets, oyster card, paper, paper tickets, paris, pass, pay, payment, plastic, plastic cards, plastic tickets, prepaid, public, public transport, public transportation, subway, subway map, symbol, ticket, tram, transport, transport card, transportation, travel, trip, tube, white,