Airports - with unpaved runways: total: 13 1,524 to 2,437 m: 1 914 to 1,523 m: 2 under 914 m: 10 (2006)
Railways: total: 96 km narrow gauge: 96 km 1.000-m gauge (2005)
Roadways:
total: 25,645 km
paved: 24,363 km (including 426 km of expressways)
unpaved: 1,282 km (2004)
Merchant marine:
total: 3 ships (1000 GRT or over) 77,177 GRT/50,138 DWT
by type: roll on/roll off 3
foreign-owned: 3 (US 3)
registered in other countries: 1 (Saint Vincent and the Grenadines
1) (2006)
Ports and terminals:
Las Mareas, Mayaguez, San Juan
Military Puerto Rico
Military branches:
no regular indigenous military forces; paramilitary National Guard,
Police Force
Military - note:
defense is the responsibility of the US
Transnational Issues Puerto Rico
Disputes - international: increasing numbers of illegal migrants from the Dominican Republic cross the Mona Passage to Puerto Rico each year looking for work