page_title: List of Interstate Highways
section_title: Puerto Rico
hierarchical_section_title: List of Interstate Highways / Interstates outside of the mainland / Alaska and Puerto Rico / Puerto Rico
context_page_description: Primary Interstate Highways are the major interstate highways of the United States and have a one or two-digit route number. Even route numbers are given to east/west routes, with the smaller numbered routes in the south and bigger numbered routes in the north. Similarly, odd route numbers are given to north/south routes, with the smaller numbered routes in the west and the bigger numbered routes in the east.
  There are five sets of numbers that are used more than once throughout the system; the highways whose numbers are used more than once are separated by big distances to avoid confusion. Below, these are made separate from each other by West and East.
  Three-digit Interstates are spur or loop Interstates that usually are in big cities and areas outside of cities. The last two digits of a three-digit Interstate are always the number of the route it is related to. If the first digit is odd, the Interstate is usually a spur route while if the first digit is even, the Interstate is usually a loop route.
context_section_description: Like Alaska, Puerto Rico signs its Interstates as territorial routes, and the numbers are not the same as their official Interstate designations.  Many of the territory's routes are freeway-standard toll roads.
   Interstate PR-1
   Interstate PR-2
   Interstate PR-3
caption: Map of the Interstates in Puerto Rico