UN-Habitat - SDG 11.3 Sustainable urbanization
A defining feature of many of the world’s cities is an outward expansion far beyond formal administrative boundaries, largely propelled by the use of the automobile, poor urban and regional planning and land speculation. A large proportion of cities both from developed and developing countries have high consuming suburban expansion patterns which often extend to even further peripheries. Cities need to accommodate new and thriving urban functions such as transportation routes, etc. as they expand.