E-ticketing

E-ticketing — electronic ticketing — lets people pay for and validate a journey without paper tickets or cash. A rider taps a contactless smartcard, phone or bank card against a reader, and software in the back office works out the fare and deducts it. The ticket becomes data rather than a printed slip.

Agencies adopt it to speed up boarding and cut the cost and theft of handling cash. Hong Kong wrote the template: its Octopus card, launched in 1997 as the world's first contactless transit smartcard, now handles around 15 million taps a day across trains, buses, ferries and shops. Budapest shows the newer, account-based approach — BudapestGO's Pay&Go turns a contactless bank card into a ticket — and in Kigali, AC Group's Tap&Go helped operators recover 30–40% of fare revenue that once leaked away as cash. A shared payment layer like this is usually the first building block of full Mobility-as-a-Service, and it is what lets bus rapid transit riders pay before they board.

The trade-offs are practical. Rolling out readers, gates and a clearing back-end is a large fixed cost, and cities can end up locked into one vendor. E-ticketing can also exclude people without a smartphone or bank account unless a cash top-up survives — and every tap generates a travel record, so who holds that data, and for how long, matters.