Infrastructure
the basic physical and organizational structures and facilities (e.g. buildings, roads, power supplies) needed for the operation of a society or enterprise. A good infrastructure is needed to keep an urban area up and running, cities are planned by a city planner. Cities are planned in 4 main ways, urban sprawl, growing along with transpiration, satellite development, and building a new city center. Mass transit also is a very important effect on moving people around. Carrying capacity is another part of good infrastructure.