This list of roads in Metro Manila summarizes the major thoroughfares and the numbering system currently being implemented in Metro Manila, Philippines. Metro Manila's major road network comprises six circumferential roads and ten radial roads connecting the cities of Caloocan, Las Piñas, Makati, Malabon, Mandaluyong, Manila, Marikina, Muntinlupa, Navotas, Parañaque, Pasay, Pasig, Quezon City, San Juan, Taguig, and Valenzuela, and the municipality of Pateros. Route classification This list only covers roads that are listed as National Primary, National Secondary, or National Tertiary Roads on the Department of Public Works and Highways's Infrastructure Atlas, as well as the previous Circumferential and Radial Road system prior to 2014. These road classifications are defined as follows: National Primary Roads – Contiguous road sections extending that connect major cities. Primary roads make up the main trunk line or backbone of the National Road System. National Secondary Roads – Roads that directly connect major ports, major ferry terminals, major airports, tourist service centers, and major government infrastructure to National Primary Roads. Both Primary and Secondary roads may be named as Bypass Roads or Diversion Roads, which divert pass-through traffic away from city or municipality business centers with affirmative feasibility studies, or roads that would connect or fill the gap between adjoining National roads. National Tertiary Roads – Other existing roads under the Department of Public Works and Highways that perform a local function. Any roads not classified as National Primary, National Secondary, or National Tertiary may be classified as follows: Expressways – Limited-access roads, normally with interchanges that may include facilities for levying tolls for passage in an open or closed system. Provincial Roads – Roads that connect barangays through rural areas, major provincial government infrastructure, and/or cities and municipalities without traversing any National Roads. Municipal and City Roads – Roads within a poblacion or roads that connect Provincial and National Roads or provide inter-barangay connections to major Municipal and City Infrastructure without traversing Provincial Roads Barangay Roads – Any other public roads within a barangay not covered by other classifications. Numbered routes Circumferential and radial roads The first road numbering system in the Philippines was adapted in 1940 by the administration of President Manuel Quezon, and was very much similar to U.S. Highway numbering system. Portions of it are 70 roads labeled Highway 1 to Highway 60. Some parts of the numbering system are Admiral Dewey Boulevard (Highway 1), Calle Manila (Highway 50) and