Background: This massive expressway runs southeast and northwest through the heart of Brasilia, providing access to some of the country's most important government, financial and cultural institutions.
How It's Unique: Brazil's capital city, Brasilia, was built in the late 1950s, allowing engineers and architects to incorporate large, urban-friendly structures into the highways, which were an important part of the city planning. The open space in the center of the higway, which some claim is the world's largest median, divides the twelve total lanes of eastbound and westbound avenues. Mahmassani likens the structure to the National Mall in Washington, D.C. "You have a lot of green space where you can do activities and people can go for big events, like presidential inaugurations."
Excerpt from http://www.popularmechanics.com/technology/engineering/architecture/4338387
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