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There are three officially designated Interstate Highways in Puerto Rico. As with Interstate Highways in Alaska, these routes do not connect to the United States Interstate Highway system, but still receive funding in a similar fashion to the Interstates in the conterminous US.
As with Interstate routes in Alaska and not Hawaii, they are unsigned Interstate routes. The designated routes of the four routes - officially PR-1, PR-2, and PR-3 - run along various combinations of Puerto Rico routes. They do not follow the rules of even and odd numbers determining direction.
Puerto Rico's interstate highways are not entirely controlled-access. Speed limits are limited to 55 MPH. Puerto Rico's superhighways are the Autopistas, which are not funded by the Eisenhower Interstate System, but by a system of tolls.
Length
| Route | miles | km | Terminus |
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| PR-1 | 71.08 | 114.39 | Ponce, PR-2 to San Juan, PR-2 (PR 22/PR 18 interchange) |
| PR-2 | 138.13 | 222.30 | Ponce, PR-1 to San Juan, PR-3 (PR 1/PR 26 interchange) |
| PR-3 | 40.56 | 65.27 | Ceiba/Roosevelt Roads Naval Air Station to San Juan, PR-2 (PR 1/PR 26 interchange) |
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