Runners exercise at Rodovia dos Imigrantes (official designation SP-160), a highway that connects the city of Sao Paulo to the Atlantic coast and with the seaside cities of Sao Vicente and Praia Grande. The expressway has several viaducts, bridges and tunnels, along its 58.5 km stretch, and it is considered one of the most audacious feats of Brazilian highway engineering, with extremely long tunnels and high strutting six-lane bridges constructed over the tropical rain forest, which covers the steep faces of the Serra do Mar, the cliff range that separates the Sao Paulo plateau from the seaside lowlands.