Just found this great 6-Part series that clearly explains a lot about the practicalities of driving a car in Italy for foreigners. I found it really helpful - have not seen anything better really.
Part 1 - Overview
Part 2 - You and the Autostrada
Part 3 - Understanding the Signage on the Autostrada
Part 4 - Autostrada Rest Areas
Part 5 - Paying Tolls on the Autostrada
Part 6 - Buying Gas for Your Car
