List of highways in Puerto Rico
Number Length ( mi ) Length ( km ) Southern or western terminus Northern or eastern terminus Formed Removed
PR-301 - - Los Morrillos Light in Cabo Rojo PR-101 in Cabo Rojo - -
PR-339 - - PR-105 in Mayagüez PR-119 in Mayagüez - -
PR-344 - - PR-345 in Hormigueros PR-348 in Mayagüez - -
PR-365 - - PR-368 in Sabana Grande PR-105 in Maricao - -
PR-366 - - PR-120 in Sabana Grande PR-365 in Maricao - -
PR-385 - - PR-127 in Peñuelas PR-132 in Peñuelas - -
PR-413 - - PR-115 in Rincón PR-115 in Rincón - -
PR-435 - - PR-119 in San Sebastián PR-124 in Lares - -
PR-500 - - Barrio Canas in Ponce PR-132 in Ponce - -
PR-501 - - PR-123 in Ponce Barrio Marueño in Ponce - -
PR-502 - - PR-132 in Ponce PR-501 in Ponce - -
PR-503 - - PR-14R in Ponce PR-143 in Utuado - -
PR-504 - - PR-503 in Ponce PR-505 in Ponce - -
PR-505 - - PR-139 in Ponce PR-503 in Ponce - -
PR-506 - - Urbanización Hacienda Juliana in Ponce PR-14 in Ponce - -
PR-510 - - PR-1 in Ponce PR-14 in Juana Díaz - -
PR-511 - - PR-14 in Ponce PR-143 in Ponce - -
PR-515 - - PR-123 in Ponce PR-10 in Ponce - -
PR-516 - - Sector Santas Pascuas in Ponce PR-123 in Ponce - -
PR-518 - - PR-131 in Adjuntas PR-123 in Adjuntas - -
List of highways -- Tertiary highways
`` For your safety '' driving in Puerto Rico sign Tertiary highways also follow a general grid . Towns which do not border the Atlantic Ocean or the Caribbean Sea , especially in the mountainous area , may overlap this grid , for example Ciales may have both highways in the 600-699 grid and the 500-599 grid , depending where they begin further north or further south . Generally along the areas where the highways are , the lower the number , the more south it is . Culebra is the only town in Puerto Rico that does not fall in any of the regions , for only PR-250 and PR-251 are the main routes . The entire immediate metropolitan area of San Juan with the exception of Caguas falls in the 800 region , while the entire east coast ( north and south ) east of San Juan , Caguas and Patillas fall in the 900 region . This is because the eastern portion of Puerto Rico has a southeastern coast which goes to the west from Humacao , which roughly defines where the Vieques Passage and the Caribbean Sea meet along the coast . Yabucoa is in the exact south-southeast area and lies in the 900 region , while Maunabo overlaps the 700 's and 900 's regions . Vieques , an offshore island-municipality , has some highways in the 900 order . PR-1 and PR-8834 in Guaynabo , Puerto Rico Some roads are numbered using four digits . For example , PR-5506 . These are branches , or spurs , of tertiary roads by the same last three digit number . Thus , PR-5506 is a branch of PR-506 . They are often dead end branches , and are common in the mountain regions of the main island . Sometimes they are loops branching off the main road and eventually connecting back to the same main tertiary road . The “ fourth ” digit is generally a repeat of the first digit of the main tertiary road in question . Thus , a branch of PR-301 would be signed PR-3301 , with the added 3 prefixing the number of the main tertiary road associated with the spur , 301 , because 3 is the first digit of the main road . When the road has more than one distinct spur , an additional unrelated digit is used ( example , PR-4301 ) .
The highway system in Puerto Rico is composed of approximately of roads in Puerto Rico, maintained by the Puerto Rico Department of Transportation and Public Works (Spanish: Departmento de Transportación y Obras Públicas) or DTOP. The highway system in Puerto Rico is divided into four networks: primary, urban primary, secondary or inter-municipal, and tertiary or local (Spanish: red primaria, red primaria urbana, red secundaria o intermunicipal, and red terciaria o local). Highways may change between networks and retain their same numbers.