The public buses in Rome run frequently from about 5.30am to midnight daily. The major bus terminus is in front of the Termini station, however you may catch the bus throughout Rome
The signs indicate the routes which are detailed with the major stops along the way.
At many of the bus stops there are electronic displays which display the estimated arrival time and routes of the buses. This information is quite accurate as it is updated by the actual buses through tracking devices.
The bus ticket costs 1.50 euro and can be purchased from tabacci, bars, vending machines at metro stations and at major bus stops. This is a flat fare, whether you travel for 1 stop or till the end of the line.
These tickets are valid for 100 minutes from the time you swipe them in the yellow machine which is on the bus or tram.
There is no need to swipe your ticket when leaving the bus nor is there any need to swipe your ticket again when continuing your journey on another bus or tram.
It usually is a mad scramble to get on to the bus, as most people will disregard any form of queue. It is basically, make sure you get on the bus regardless. And, do not expect to get a seat, as these buses are always so crowded unless you are getting on the bus at the starting point.
Tickets for both the bus system and Metro can be purchased from tobacconists, bars, or vending machines at metro stations and major bus stops. There are many tabacci/kiosks at the bus station and around Termini who are familiar with dealing with tourists and most often speak English
All the public transport in Rome is integrated.
You must purchase your tickets before you board the bus or any public transport. The tickets must also be validated. From time to time ticket inspectors will check all passengers to make sure they have a valid ticket, if not they will incur a heavy fine.
If you are brave, there are some automatic ticket vending machines with instructions in English at Termini Station