•  National transport systems and infrastructures, including road, railway, water, air transport;
• National airports and air transport systems;
• Traffic planning;
• Highways and national roads, and 
• Traffic regulation;

Concurrent competences with the Regions are:

• Civil ports and airports;
• Large-scale transport and navigation networks, and
• Communications.
  

Regional authorities are responsible for:

• Regional public transport;
• Maritime transport;
• Ports and other infrastructure for maritime transport;
• Internal navigation;
• Railway of regional interest;
• Inter-regional roads (with the unified Conference), and
• Public works of regional interests (highways, waterworks, etc.).

Provincial authorities are responsible for:

• Provincial transport;
• Construction and maintenance of provincial roads;
• Provincial highways and public transport, and
• Driving schools.
   
  

Municipal authorities are responsible for:

• Local public transport;
• Urban transport;
• Municipal territorial planning;
• Construction and maintenance of local roads;
• Urban traffic control;
• Aqueducts, and
• Motorways.
  
  

Sources

Constitution, Article 117.

Decreto Legislativo 18 agosto 2000, n. 267 "Testo unico delle leggi sull'ordinamento degli enti locali" (G.U. n. 227 del 28 setembre 2000 - Supplemento Ordinario n. 162) [Legislative Decree 267/2000 on the organisation of local authorities], Articles 13 and 19.

Decreto Legislativo 31 marzo 1998, n. 112 "Conferimento di funzioni e compiti amministrativi dello Stato alle regioni ed agli enti locali, in attuazione del capo I della legge 15 marzo 1997, n. 59" (G.U.  n. 92 del 21 aprile 1998 - Supplemento Ordinario n. 77

(Rettifica G.U. n. 116 del 21 maggio1997) [Legislative Decree 112/1998].

Legge 7 aprile 2014, n. 56, recante: “Disposizioni sulle città metropolitane, sulle province, sulle unioni e fusioni di comuni" (G.U. Serie Generale n. 81 del 7 aprile 2014. [Law 56/2014 on Metropolitan Cities, the provinces and on the union and merging of municipalities].