Trinidad and Tobago, a country that relies heavily on industrialisation and tourism, has various transport systems. Air service Trinidad is the larger island, with a business-oriented economy and the seat of the country's government. Piarco International Airport serves the island of Trinidad with international flights to destinations in the Caribbean, South America, North America and Europe. The airport is located in the town of Piarco off the Churchill Roosevelt Highway, 30 km (19 miles) away from Port of Spain. It has been voted the best airport in the Caribbean on numerous occasions. A smaller number of international flights fly directly to Tobago's A.N.R. Robinson International Airport (formerly Crown Point International Airport). The airport is mostly kept active by the domestic airbridge, a heavily subsidized flight service between Trinidad and Tobago, operated as much as 20 times per day by Caribbean Airlines. There is also a small airfield named Camden Airstrip in Couva, which is mainly used for cropdusting planes. Public transport Public transport is provided by a bus service operated by government-owned Public Transport Service Corporation (PTSC), privately owned mini-buses (locally known as maxi-taxis) and privately owned cars. Maxi-taxis and some cars carry passengers along fixed routes for a fixed fare, although cars are slightly more expensive for similar routes carried by maxi-taxis because of their much smaller passenger capacities. Car taxis are not allowed to utilise the Priority Bus Route, and as such maxi-taxis and buses are preferable for speedily entering and exiting the cities (especially Port of Spain) during rush hour (7am–9am and 4pm–6pm). In downtown Port of Spain on a street referred to as South Quay is the historic site of the Trinidad Government Rail (TGR) building at #60 South Quay, Port of Spain. This former railway facility is now the current administrative and bus loading headquarters of the Public Transport Service Corporation (PTSC). The compound also houses the Maxi Taxi loading facility which is located in its north-eastern quadrant. The Maxi Taxi loading facility is utilized by both route two or red-banded Maxi Taxis and route three which are green-banded. The red-banded Maxi Taxis ply for hire from Port of Spain eastward to as far as the town of Sangre Grande. Green-banded Maxi Taxis ply for hire from Port of Spain in a southern direction to either Chaguanas which is considered central Trinidad or to the region of San Fernando located along the south-western coast of