For immediate information see http://www.noleggio-auto-roma.it/
Caution!
If you book a certain type of car and upon delivery you get a larger one, the Rental Company cannot require an additional cost !
Limited Traffic Zones in Rome Capitale have the purpose to protect the huge historical and archaeological heritage of our City , safeguard life of life and improve the use of public trasportation, thus reducing pollution.
ZTL is forbidden to cars without a special permit.
http://www.agenziamobilita.roma.it/it/servizi/orari-ztl/
The so called parking exchange are situated near subway stations, city trains stations or near bus terminus. Parking exchange could be or not automated. Payment methods are different for each category, also for a possible exemption.
Parkings with not bound rate are situated in particular attraction areas and are subject to different rates. For instance Auditorium Parking, Partigiani(near Ostiense Station), Metronio, Trieste and Trastevere.
On white stripes parkings, stopover is free.
On blue stripes parkingsa stopover is subject to payment on an hourly free.