An area within a city in a less developed country in which people illegally establish residences on land they do not own or rent and erect homemade structures.
Rush (or peak) hour
The four consecutive 15-minute periods in the morning and evening with the heaviest volumes of traffic
Gentrification
A process of converting an urban neighborhood from a predominantly lm,--income renter-occupied area to a predOlninantly middle-class owner-occupied area.
Public housing
Housing owned by the government; in the United States, it is rented to low-income residents, and the rents are set at 30 percent of the families' incomes.
Peripheral model
A model of North American urban areas consisting of an inner city surrounded by large suburban residential and business areas tied together by a beltway or ring road.
Urbanized area
In the United States, a central city plus its contiguous built-up suburbs.
Urbanization
An increase in the percentage and in the number of people living in urban settlements.
Greenbelt
A ring of land maintained as parks, agriculture, or other types of open space to limit the sprawl of an urban area.
Concentric zone model
A model of the internal structure of cities in which social groups are spatially arranged in a series of rings.
Filtering
process of change in the use of a house, from single-family owner occupation to abandonment.
