文章编号： 1672-5328（2015）01-0060-06

周涛，但媛，朱军功
(重庆市交通规划研究院，重庆400020)

摘要： 道路网连通性是评价城市道路网是否合理的重要指标之一。首先，对既有城市道路网连通性 评价指标“连接度指数”进行深入解读，认为其实质上反映了路网中十字形交叉口、T 字形交叉 口等各类型交叉口的比例关系；其次，针对该指标无法体现交叉口转向限制对路网连通性的影响， 改进建立了“连通度指数”计算方法，能够较好地描述道路交叉口存在的“非完全互通立交、转向 限制、单向交通”等实际交通设计和管理条件下的方向连通性。最后，针对重庆市三个典型片区进 行了应用分析。

关键词： 交通规划；城市道路网；规划指标；连通性；连接度指数；连通度指数

中图分类号： U491

文献标识码：A

Assessment of Urban Roadway Network Connectivity

Zhou Tao, Dan Yuan, Zhu Jungong
(Chongqing Transport Planning Institute, Chongqing 400020, China)

Abstract： Connectivity is one of the most important indices to assess the appropriateness and efficiency of urban roadway network. By reviewing existing criteria for urban roadway network connectivity evaluation, this paper identifies that most connectivity indices in fact reflect the proportions of intersections with various layouts (e.g. four-leg and T-shape) in roadway network. Realizing the deficiency of existing indices to consider the impact of turning restrictions on roadway network connectivity, this paper proposes a new connectivity index, which can better reflect the directional connectivity under different traffic design and management conditions, such as interchange, turning restrictions, one-way street, and etc. Finally, the paper illustrates the performance of the proposed index in three typical areas in Chongqing.

Keywords： transportation planning; urban roadway network; planning indices; connectivity; connection index; connectivity index