Which contactless payment innovation was first widely adopted by public transportation systems to reduce boarding times and improve operational efficiency?

Modern transportation systems are evolving rapidly with innovative payment solutions transforming how passengers access and pay for mobility services. From traditional cash and tickets to contactless cards and mobile apps, the way we pay for transportation has undergone significant changes. This trivia question explores a key innovation in transportation payment systems that has revolutionized urban mobility in recent years.

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Transit-specific mobile wallet apps with QR code scanning
Contactless EMV bank card acceptance (tap-to-pay) on fare readers
Bluetooth-enabled automatic fare collection gates
Facial recognition payment systems linked to passenger accounts