The Pan-American Highway is the longest motorable road in the world, stretching from Prudhoe Bay, Alaska in North America to Ushuaia, Argentina in South America. It is 19,336 miles (31,115 km) long and passes through 14 countries: Canada, the United States, Mexico, Guatemala, Belize, Honduras, El Salvador, Nicaragua, Costa Rica, Panama, Colombia, Ecuador, Peru, Bolivia, Chile, and Argentina.
The Pan-American Highway is not the busiest road in the world. That title belongs to the G4 BeijingâHong KongâMacau Expressway, which is a 2,200-mile (3,540-km) expressway that connects Beijing, China to Hong Kong and Macau. The G4 is the busiest road in the world in terms of both traffic volume and annual passenger traffic.
The Pan-American Highway is also not the highest road in the world. That title belongs to the Karakoram Highway, which is a 1,300-mile (2,100-km) highway that connects Pakistan and China. The Karakoram Highway is the highest paved international road in the world, with its highest point at 15,500 feet (4,700 m) above sea level.
Therefore, the correct answer to the question "Pan - American Highway, north-west Alaska to Southernmost Chile is the worlds" is:
The Pan-American Highway is the longest motorable road in the world, stretching from Prudhoe Bay, Alaska in North America to Ushuaia, Argentina in South America. It is 19,336 miles (31,115 km) long and passes through 14 countries: Canada, the United States, Mexico, Guatemala, Belize, Honduras, El Salvador, Nicaragua, Costa Rica, Panama, Colombia, Ecuador, Peru, Bolivia, Chile, and Argentina.