Interstate PR1

Puerto Rican Highway System
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

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.

Puerto Rico roads are classified according to the network they belong to. Thus there are four types:

In this regard, a primary road is one which is part of the Primary Network, an urban primary road is part of the Urban Primary Network, etc. Generally, the same highway may change between networks, but the highway will continue to have the same number. For example, PR-1, connecting Ponce and San Juan, is signed as Urban Primary inside the Ponce city limits, then it is signed as Secondary in Ponce's rural barrio Capitanejo, and then it is again signed as Urban Primary on its entry into the town of Santa Isabel.

Primary roads are numbered 1 through 99, secondary roads are numbered 100 to 299, and tertiary roads are numbered 300 to 9999.

Until 1999, all non-tolled numbered highways in Puerto Rico had the same route shield, a square with a white-on-black half-circle with the route number in the bottom two thirds and a map of Puerto Rico with the words "Puerto Rico" written inside in the top third.

All Puerto Rico Highway System roads, regardless of the network they belong to are maintained by the centralized, Commonwealth-level, Departmento de Transportacion y Obras Publicas (DTOP). Municipal governments are not responsible for maintenance of the Puerto Rico Highway System roads within their territory whether or not the municipal government is an autonomous government or not; DTOP is the responsible agency. The DTOP maintains a network of regional offices throughout the island which carry out DTOP work within their multi-municipality region. Municipal governments are only responsible for maintenance of the non-numbered (Municipal Roads), as well as the city and town streets within their jurisdictions. On occasion, the central government has entered into MOAs with municipal governments for the collaborative maintenance of some Puerto Rico Highway System roadways within their municipalities.