http://www.citylab.com/design/2015/02/the-bright-future-of-dar-es-salaam-an-unlikely-african-megacity/385801/

"New York City added roughly 4 million residents over the past 100 years. Dar es Salaam will add 21 million over a similar span."

"According to Jacque Morisset, the World Bank's lead economist for Tanzania, residents of Dar es Salaam are generally more well-off than rural residents. Dar es Salaam has a poverty rate of only 4.1 percent, compared to 33.3 percent in rural Tanzania. According to a 2013 report by Oxford Economics, no African city will lift more residents into the middle class by 2030 (earning $5,000 to $20,000 per year) than Dar es Salaam. Even in terms of urban planning, the future megacity seems to be getting its act together.

More than 16 miles of commuter train lines running in and out of downtown opened in 2012, according to the BBC. By the end of this year, a $150 million Bus Rapid Transit (BRT) network is expected to be up and running. Both projects have the potential to rapidly reduce traffic congestion. But, most importantly, they show a city that realizes it's finally coming to the fore. And Dar es Salaam seems poised to make the most of it."