In Sao Paulo, Brazil, planners are challenged with untangling traffic jams that stretch for over 120 miles.
"In Brazil's financial capital of Sao Paulo, the traffic is so bad that vendors line its major highways during rush hour, selling cold beer and snacks to motorists.
Traffic jams around the city can total more than 200 km (124 miles), and on a good day it can take more than two and a half hours to cross town.
The gridlock underscores a broader challenge facing the Latin American giant. As the economy booms, the country's creaky infrastructure is bursting at the seams, forcing public officials to scramble for ways to compensate for decades of poor planning.
"For too long, the prevailing mind-set in this country has been to tackle problems with temporary solutions that bring a short-term fix," said Candido Malta Campos, an urban planner at the University of Sao Paulo.
"If we keep doing that, Sao Paulo is going to grind to a halt in four or five years." "