The Philippine highway network is a network of national roads owned and maintained by the Department of Public Works and Highways (DPWH) and organized into three classifications according to their function or purpose: national primary, secondary, and tertiary roads. The national roads connecting major cities are numbered from N1 to N83. They are mostly single and dual carriageways linking two or more cities. As of October 15, 2019, it has a total length of 21,646.10 kilometers (13,450.26 mi) of concrete roads, 10,440.98 kilometers (6,487.72 mi) of asphalt roads, 889.21 kilometers (552.53 mi) of gravel roads, and 41.96 kilometers (26.07 mi) of earth roads, with a grand total of 33,018.25 kilometers (20,516.59 mi). According to a 2011 report from the Asian Development Bank, the extent of the road network in the Philippines is comparable with or better than many neighboring developing countries in Southeast Asia. However, in terms of the quality of the road system, i.e., the percentage of paved roads and the percentage of those in good or fair condition, the country lagged behind its neighbors as of 2012. (en)