Transport in South America is basically carried out using the road mode, the most developed in the region.
Brazil has more than 1.7 million km of roads, of which 215,000 km are paved, and about 14,000 km are divided highways. The two most important highways in the country are BR-101 and BR-116.
Argentina has more than 600,000 km of roads, of which about 70,000 km are paved, and about 2,500 km are divided highways. The three most important highways in the country are Route 9, Route 7 and Route 14. 
Colombia has about 210,000 km of roads, and about 2,300 km are divided highways. 
Chile has about 82,000 km of roads, 20,000 km of which are paved, and about 2,000 km are divided highways. The most important highway in the country is the Route 5 (Pan-American Highway)
These 4 countries are the ones with the best road infrastructure and with the largest number of double-lane highways.