Despite Italy's reputation for wild drivers, Americans who have spent time keenly observing Italy's roads have come to learn that Italian drivers are more skilled and more alert than the average American road warrior. But driving in Italy is different, and knowing the ropes can make the trip a pleasure. The autostrade are highways with relatively narrow lanes and plenty of curves that require attention.
Speeds are high and road manners important.
Keep right at all times except to pass. It's the law, and a socially enforced practice. Always signal when passing. Don't worry about passing trucks in Italy. Trucks and buses are restricted to much lower speeds than cars and they generate very little turbulence.