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A single trip lasts 100 minutes from the first tap, with the exception of metro lines where it is valid only for a single journey. This means that your journey on the metro can include different lines, but without passing through the turnstiles if you change between lines A-B-B1; passing the turnstiles is permitted only to change between line A and C., the same as for a normal BIT ticket.
IIf you want to carry on your journey on Cotral surface vehicles (urban route) or urban railways (Metromare and Roma-Viterbo - urban section) remember to download the Atac Tap & go ® application (only on Android devices with NFC technology), necessary in case of on-board controls. If you want to carry on your journey on Trenitalia regional trains (second class urban route), in case of on-board controls you will have to display the credit card used for the payment or communicate part of its PAN (first six or last four digits of the card number).