Smart cards that can be used across a variety of public transport is becoming popular in places that see a huge turnout of tourists. In London, travellers can use the Oyster Card to travel on bus, Tube, tram, DLR, London Overground, TfL Rail, Emirates Air Line, River Bus services and most National Rail services in London. The Singapore Tourist Pass allows travellers to the island nation to enjoy unlimited travel on its basic bus services, MRT and LRT trains for the valid duration of the card. Hong Kong has gone one step further with its Octopus Card which is a stored-value electronic card that can be used for most public transport, as well as purchases in convenience stores, fast food shops, supermarkets, cake shops, vending machines and more.
