The history of access control in Rome began in 1989 when restrictions were placed on vehicle entrances for the historical centre. These restrictions were not systematically enforced until 1994, when municipal police were used to block entry into the area. Permission to enter is given free of charge to residents of the area. Other users may obtain permission to circulate and park in the area if they belong to certain categories, such as doctors with offices in the centre or shopkeepers.
In 1998 this authorization became more complicated, as authorized non-residents are now required to pay yearly the equivalent of 12 monthly public transport passes for a permit to access the controlled area.
The pricing zone has an area of 4.6km2 and is controlled through 22 entrance gates. The area contains about 42,000 residents and over 116,000 workers.
The access control was operated automatically from October 2001 using the IRIDE system. Enforcement is active during the weekdays from 6.30am to 6.00pm, and on Saturday from 2.00-6.00pm.