Urban sprawl or suburban sprawl describes the expansion of human populations away from central urban areas into previously remote and rural areas, often resulting in communities reliant upon heavy automobile usage. Urban sprawl is a multifaceted concept of community planning especially relevant to developed nations (and primarily the United States, Canada, and Australia), involving topics that range from the outward spreading of a city and its suburbs to exurbs, to low-density and often auto-dependent development on rural land. The term also involves examination of impact of high segregation between residential and commercial uses, and analysis of various design features to determine which may encourage car dependency. The term "sprawl" is most often associated with land use in the English-speaking world; in Continental Europe the term "peri-urbanisation" is often used to denote similar dynamics and phenomena. Urban sprawl has over the last couple of decades become the subject of analysis about how to manage urban growth.