Urban road networks are typical complex systems, which are crucial to our society and economy. In this study, topological characteristics of a number of urban road networks purely based on physical roads rather than routes of vehicles or buses are investigated in order to discover underlying unique structural features, particularly compared to other types of transport networks. Based on these topological indices, correlations between topological indices and small-worldness of urban road networks are also explored. The finding shows that there is no significant small-worldness for urban road networks, which is apparently different from other transport networks. Following this, community detection of urban road networks is conducted. The results reveal that communities and hierarchy of urban road networks tend to follow a general nature rule.

中文翻译：

---

城市道路网的统计特征与社区分析

城市道路网络是典型的复杂系统，对我们的社会和经济至关重要。在这项研究中，研究了纯粹基于物理道路而不是车辆或公共汽车路线的许多城市道路网络的拓扑特征，以便发现潜在的独特结构特征，特别是与其他类型的交通网络相比。基于这些拓扑指标，还探讨了拓扑指标与城市道路网络小世界性之间的相关性。调查结果表明，城市道路网没有明显的小世界，这显然与其他交通网络不同。随后，对城市道路网络进行社区检测。结果表明，城市道路网络的社区和等级往往遵循一般的自然规律。