Which contactless payment innovation was first widely implemented in public transportation, revolutionizing how commuters pay for transit in major cities?

The transportation industry has been rapidly evolving its payment systems to enhance passenger convenience and streamline operations. From contactless payments on public transit to automated toll collection and mobile apps for ride-hailing services, payment technology is transforming how we pay for getting from point A to point B. Test your knowledge about one of the most innovative payment developments in modern transportation systems!

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QR code mobile ticketing
RFID smart cards (like London's Oyster card and Hong Kong's Octopus card)
NFC-enabled credit card direct payments
Facial recognition payment systems