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The highway system in Puerto Rico is composed of approximately 14,400 kilometers of roads and is maintained by Puerto Rico's Department of Transportation and Public Works or DTOP. The highway system in Puerto Rico is divided into four networks: primary, urban primary, secondary or inter-municipal, and tertiary or local . Highways may change between networks and retain their same numbers. In addition, there is a fifth network of local roads called Municipal Roads and they are maintained by the local Municipalities. Theses roads are not numbered and they do not have kilometer markers.

Puerto Rican Highway System
PR primary 1.svg PR urban primary 1.svg PR secondary 1.svg Circle sign 1.svgPre-1999 Puerto Rico highway shield Forest Highway 191 shield
Top row: Highway shields for Primary, Urban primary, Secondary and Tertiary sections of PR-1
Bottom row: Example of the pre-1999 and forest highway shields
Highway names
Interstates: Interstate PRnn (PRI-nn)
Commonwealth: Puerto Rico Highway nn (PR-nn)
System links
Puerto Rico Highways
Route number shields on Puerto Rico Highway 191 in 2009. On the left is the current tertiary highway shield, in the middle, a Forest Highway shield, and, on the right, a pre-1999 shield.
PR-52 highway in Puerto Rico, en route from Juana Diaz to Santa Isabel, eastbound.

The highway system in Puerto Rico is composed of approximately 14,400 kilometers (8,900 mi) of roads and is maintained by Puerto Rico's 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, primaria urbana, secundaria o intermunicipal, and terciaria o local, respectively). Highways may change between networks and retain their same numbers. In addition, there is a fifth network of local roads called Municipal Roads and they are maintained by the local Municipalities. Theses roads are not numbered and they do not have kilometer markers.