While the total roadway network covers more than 30,000 km (24,600 mi), the National Highway System is about 16,000 km (9,942 mi). Of this total, 4,300 km (2,672 mi) or 27 percent is under a PPP arrangement. An additional 1,500 km (932 mi) of network enhancements and upgrades are under construction through PPP contracts, which will increase the percentage of the National Highway System under PPPs to 33 percent. PPPs are also used by Spain's Autonomous Communities (Communidad). While the national government does not initiate these arrangements, it may lend funding and management assistance to the autonomous jurisdictions.
Since 2000, the level of investment in roads, airports, railways, and ports via concessions has risen to roughly 20 percent of total transport investment, as depicted in figure 3. The vast majority of the concessions during this period were for roads. In the future, Spain expects to continue this approach to transport financing, as shown in table 2.