Recently, the Graphical Report of Road Network Structure of Key Cities in China, produced by the Road Traffic Safety Research Center of the Ministry of Public Security, Beijing Cennavi Technologies Co., Ltd. and China Academy of Urban Planning and Design, was officially released. The "Report" selects 36 key cities in China for research, and it consists of four parts, i.e. Overview, Urban Road Network Figures, Urban Road Network Figure and Traffic Safety, and Road Network Figures of Key Cities.