Diversity of Building Blocks Unity of Construction Rule for Transportation Networks

The identification of local structure composition may help understand the network construction law from a bottom-up view. Focusing on structure, subgraph approach was applied to systematically analyze 3- 7-node subgraphs in several transportation networks China. Results show that number and forms increase as scale increase, but rate are different, which indicates diversity building blocks networks. Moreover, both rank can be divided into two kinds, each corresponding one transport geographical service kinds reflect unity rule or due similarity cost, technical space constraints. methods results used standards planning, evaluation optimization