Urban regions have come under increasing pressure to adapt to the imperatives of mobility, including greater freedom of travel, rising trade volumes and global economic networks. Whereas urbanization was once characterized by the concentration of services and facilities, urban areas now have to ensure the exchange of goods, services and information in a much more complex, interrelated, highly competitive, and spatially dispersed environment. As a consequence, cities are challenged to ensure the functionality of infrastructure while mitigating negative environmental and social impacts. ...