A Central Business District
The typical CBD (Central Business District) dominates the commercial and the cultural activity of a city. In many large cities it is immediately recognizable by the tall skyscrapers, the neon lights at night and the high density of traffic, buildings and people. The CBD is usually highly accessible. It is the focus of roads with many bus and railway stations nearby. The largest urban areas often have a mass rapid transport system such as the London Underground. The CBD has the highest density of bus and taxi services in the whole of the urban area. The CBD is crowded with people day and night, working, shopping or for entertainment, although the residential population is very small due to high property prices.