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| | }} The highway system in Puerto Rico is composed of approximately 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. ==Route number shields== 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of highways in Puerto Rico」の詳細全文を読む スポンサード リンク
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