Transport in Puerto Rico includes a system of roads, highways, freeways, airports, ports and harbors, and railway systems, serving a population of approximately 4 million inhabitants year-round. It is funded primarily with both local and federal government funds. Puerto Rico has an extensive system of roads and highways featuring tolled freeways (autopistas). Some are designated as Interstate Highways; although these routes do not connect to the contiguous United States, and are unsigned as such, they still receive funding in a similar fashion to the other Interstates on the U.S. mainland. In total, there are more than 8,950 miles (14,400 km, 1999 est.) of paved road. transport in Puerto Rico is heavily dependent on automobile transport. Nevertheless, the government has increased investment in public transport in an attempt to decrease vehicle dependency and road congestion. Most cities and towns also have a Jitney-type taxi system locally called Carros Públicos. Each town has a central taxi terminal usually within walking distance of the town’s central plaza where taxis are stationed, and they provide transport through local and islandwide routes. In February 2014, the islandwide system of Carros Públicos consisted of over 3,000 vehicles authorized by the "Comission de Servico Público" (Public Service Commission), and it covered almost 500 routes.