A single trip lasts 100 minutes (1 BIT). You begin your journey on the metro or on one of the three regional railways (Roma-Lido, Termini-Centocelle, Roma-Viterbo urban section) and then you can continue also on surface vehicles up to the 100 minutes of validity.

If you want to continue your journey on Cotral vehicles, you must have downloaded the Atac tap & go ® application (only on Android devices with NFC technology), necessary in case of on-board controls. At the moment you cannot use tap & go ® on Trenitalia trains.