Complexity analysis on public transport networks of 97 large- and medium-sized cities in China

The traffic situation in Chinese urban areas is continuing to deteriorate. To make a better planning and designing of the public transport system, it is necessary to make profound research on the structure of urban public transport networks (PTNs). We investigate 97 large-and medium-sized cities' PTNs in China, construct three types of network models bus stop network, bus transit network and bus line network, then analyze the structural characteristics of them. It is revealed that bus stop network is small-world and scale-free, bus transit network and bus line network are both small-world. Betweenness centrality of each city's PTN shows similar distribution pattern, although these networks' size is various. When classifying cities according to the characteristics of PTNs or economic development level, the results are similar. It means that the development of cities' economy and transport network has a strong correlation, PTN expands in a certain model with the development of economy.