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Different applications (best price calculation, check-in/check-out, walk-in/walk-out, …) with different media (contact and contact less smart cards, mobile phone, combination of payment and fare functionality on one single medium,…) have been introduced into the market or are in the process of being introduced.
Mi duda es si walk in /walk out se referirá a entrada / salida (¿de los vehículos?)o puede tener otro sentido. Se trata de nuevas tecnologías aplicadas al transporte público. Al no desarrollarse más el concepto, tengo una idea demasiado abstracta.