Accounting for almost 40% of total subnational investment, transport and economic affairs are the largest investment sectors in the OECD.
Economic affairs and transport were the priority sectors for subnational government investment in 2015, accounting for 39% of SNG investment on average in the OECD. Under this heading are transport, communications, economic development, energy, construction, etc. Transport systems, facilities and public transportation make up the bulk of investment in this category (around three-quarters), which comprises construction of roads (highways, local roads, bicycle paths, etc.), railways, water transport, air transport and airports, pipelines and other transport systems such as funiculars, cable cars, etc. In Australia, Ireland, Estonia and Greece, investment in economic affairs/transport represented more than 50% of subnational investment in 2015. By contrast, this sector is under-represented in Denmark, Slovenia, Sweden, Latvia and Hungary (less than 20% of subnational investment and even 12% in Hungary) ( 5.14).