<P> Italy is one of the countries with the most vehicles per capita, with 690 per 1000 people in 2010 . Italy has a total of 487,700 km of paved roads, of which 6,758 km are motorways with a general speed limit of 130 km / h (81 mph), which since 2009 was provisioned for extension up to 150 km / h (93 mph). The speed limit in towns is usually 50 km / h (31 mph) and less commonly 30 km / h (19 mph). </P> <P> Italy has 2,400 km (1,491 mi) of navigable waterways for various types of commercial traffic, although of limited overall value . </P> <P> In the northern regions of Lombardy and Venetia, commuter ferry boats operate on Lake Garda and Lake Como to connect towns and villages at both sides of the lakes . The waterways in Venice, including the Grand Canal, serve as the vital transportation network for local residents and tourists . Frequent shuttle ferries (vaporetta) connect different points on the main island of Venice and other outlying islands of the lagoon . In addition, there are direct shuttle boats between Venice and the Venice Marco Polo Airport . </P> <Table> <Tr> <Th> show List of ports in Italy </Th> </Tr> <Tr> <Td> <Ul> <Li> Ancona </Li> <Li> Arbatax </Li> <Li> Augusta </Li> <Li> Bari </Li> <Li> Brindisi </Li> <Li> Cagliari </Li> <Li> Catania </Li> <Li> Civitavecchia </Li> <Li> Genoa </Li> <Li> Gioia Tauro </Li> <Li> La Spezia </Li> <Li> Livorno </Li> <Li> Messina </Li> <Li> Milazzo </Li> <Li> Naples </Li> <Li> Olbia </Li> <Li> Palermo </Li> <Li> Porto Torres </Li> <Li> Ravenna </Li> <Li> Salerno </Li> <Li> Savona </Li> <Li> Taranto </Li> <Li> Trieste </Li> <Li> Venice </Li> </Ul> </Td> </Tr> </Table>

What is the main form of transportation in italy