You can buy bus tickets and one-week passes from automated machines, many tobacco shops and newsstands as well as agency offices. A single trip is ITL1,500, daily pass ITL6,000. The weekly pass covers buses, the Metropolitana and some suburban train lines and costs ITL24,000. The price is equal to 16 trips, or four days of out and back twice each day. The also operate an InfoPoint service.
Bus stops are well marked.
Signs list the busses that stop there, their endpoints, and major intermediate stops. You can easily determine which bus you want, perhaps sometimes requiring the use of a map. Many city maps show bus routes, and bus information can be obtained from the ATAC offices. Board the bus at the rear, and validate your ticket in the machine by the door. Disembark at the center or front doors, not the rear.