A network of free flow toll highways connects the various areas of the city. They include the Vespucio Norte and Vespucio Sur highways, which surround the city completing a nearly full circle; Autopista Central, the section of the Pan American highway crossing the city from north to south, divided in two highways  apart; and the Costanera Norte, running next to the Mapocho River and connecting the international airport with the downtown and with the wealthier areas of the city to the east, where it divides into two highways.