Source: United Nations, Department of Economic and Social Affairs, Population Division (2018). World Urbanization Prospects: The 2018 Revision, Online Edition.
Between 1950 and 2015, the global urban population more than tripled to reach 3.9 billion. While urbanization has considerably slowed down in developed economies, the developing world is where cities are growing the most. This process was accompanied by significant surges in urban mobility demands.