Around the world there are about 3.5 billion people living in cities, but their areal extension covers only 2 % of the Earth’s land surface. This indicates that a large number of people live in a small area, resulting in overcrowding. In such a situation, the challenge lies in the management of safety and facilitation of needs for people to live comfortably. Towards this direction, there is continuous improvement in transportation, energy distribution, construction, technology development, provision of facilities and utilities. In recent years, the negative impacts of rapid urbanization are recognized, as many problems are being faced by cities. For example, traffic congestion, poor services of facilities, high cost of housing, etc.