Introduction: [highway]: As of 1996, the Republic of Trinidad and Tobago had 8,320 kilometers of roads, and in 1993 there were 153,271 registered motor vehicles. [Waterway transportation]: The Republic of Trinidad and Tobago is mainly for sea transportation. There are four main ports: Port of Spain, Cape Lisa, Chaguaramas and Cape Tabalado, of which Port of Spain is the largest. There are shipping lines to major ports in the world, with a total throughput of 20.583 million tons in 1990. There are 6 merchant ships, including 1 passenger ship, 4 passenger and cargo ships, and 1 oil boat. [air transport]: There are 6 airports in Trinidad and Tobago. Trinidad and Tobago each have an airport for large passenger aircraft such as Boeing 747. Piacco International Airport, located in the capital, Port of Spain, is the most modern airport in the English-speaking Caribbean, with direct flights to Europe, the United States, Canada, and Latin America.