The world's longest road system is the Pan American Highway, which cross-crosses Central and South America from the north of Mexico to the south of Chile and links 17 capital cities. The total system covers 29,525 miles (47,516 km). It links up with roads in the United States of America and on to Canada, although these are not officially counted as part of the system.
The main aim of the network is to make the transport of goods easier, both between the countries linked by the network and to the coasts for export elsewhere in the world, especially coffee and sofa from Brazil, beef and corn from Argentina and wine from Chile.
The Longest Traffic Jam
Traffic congestion on streets and highways increases travelling times and can also make driving more dangerous. Scientists and engineers are developing intelligent system to deal with congestion.