I’m preparing for another trip (#12j to Italy - it never gets boring - and came across this very helpful website not only with links to ZTL Google maps, but has a lot of detailed information about hours in effect, parking, hotels. Just click on this link. As far as regions and cities, just scroll down the page for a complete list.
ZTLs in Italy are not my problem. It is those pesty radar cameras that get on my nerves. Many are in low traffic, out of the way places and they are a big revenue source. You get a letter asking for € wire transferred to the city's checking account a year later--and a charge from the rental company who told them who had the car and your address.
This is very helpful, thanks!
Speed limits (contrary to ZTLs) are very well signed in Italy.