Hyper-mobility ― the notion that more travel at faster speeds covering longer distances generates greater economic success ― seems to be a distinguishing feature of urban areas, where more than half of the world’s population currently reside. By 2005, approximately 7.5 billion trips were made each day in cities worldwide. In 2050, there may be three to four times as many passenger-kilometres travelled as in the year 2000, infrastructure and energy prices permitting. Freight movement could also rise more than threefold during the same period. Mobility flows have become a key dynamic of urbanization, with the associated infrastructure invariably constituting the backbone of urban form. Yet, despite the increasing level of urban mobility worldwide, access to places, activities and services has become increasingly difficult. Not only is it less convenient ― in terms of time, cost and comfort ― to access locations in cities, but the very process of moving around in cities generates a number of negative externalities. Accordingly, many of the world’s cities face an unprecedented accessibility crisis, and are characterized by unsustainable mobility systems.