[2] Metrebus (an acronym composed of the words "Metro", "Train" and "Bus") is an integrated fare system active in the city of Rome and in much of the Lazio region.

The system includes the three main companies that manage local public transport in the Lazio region, namely ATAC, Cotral and Trenitalia.

There is also a single ticket "BIT” (Biglietto Integrato a Tempo), which sells for only €1.50, allowing travel on any bus and one trip on the metro or urban trains.

Access to buses, trams, trolleybuses and metro lines is possible also with digital cards on NFC-enabled devices (smartphones, smartwatches, wearables).

[8][9][10] In June 2018, the Red Metrebus Card was replaced by a new one, which allowed Pay&Go in car parks and to reload it and purchase transport titles in PARC meters as well as with an NFC smartphone.