文章编号：1672-5328（2012）05-0001-05

杨小文，李克平
（同济大学交通运输工程学院，上海 201804）

摘要：《城市道路交叉口规划规范》第3.4.2条强制性条文规定：“新建、改建交通工程规划中的平面交叉口规划，必须对交叉口规划范围内规划道路及相交道路的进口道、出口道各组成部分作整体规划。”为了说明该条文对于充分、高效利用交叉口进口道“时空资源”、提高交叉口整体通行效益的意义，从交叉口进口道“时(绿信比)空(车道数量与宽度)资源”转化的基本理念及量化解析两方面入手，详细分析了该条文的基本原理，并利用实例进行定量计算。结果显示，若新建或改建的主要道路进口道不具备增加车道的条件，而相交次要道路进口道具备该条件，则通过增加次要道路进口道车道数，转换各进口道间的“时空资源”，不但能提高其本身的通行能力，还能同时提高主要道路的通行能力。

关键词：城市道路交叉口规划规范；通行能力；饱和流量；绿信比

中图分类号：U412.35

文献标识码：A

Significance of Specifying Intersection Planning Scope in the Nation Standard

Yang Xiaowen, Li Keping
(School of Transportation Engineering, Tongji University, Shanghai 201804, China)

Abstract：Section 3.4.2 the mandatory provision in the national standard "Code for Planning of Intersections on Urban Roads" clearly states: “Intersection planning in newly-built and rebuilt transportation infrastructure planning should take planning roads, approaches and exits of intersecting roads as integrated”. For proving the importance of this section in efficient use of “time and space resources” of approaches and improvement of overall traffic effectiveness of the intersection, this study comprehensively analyzes the basic principle of this provision from the basic idea and concise quantization of "time (green ratio) and space (number and width of lanes) resources" transformation. Quantitative calculation example shows that when it is impossible to increase number of lanes in the planning newly-built or rebuilt main road, only increasing the number of approaches in intersecting minor roads can increase not only the capacity of the minor roads but also the capacity of the main road by the means of“ time and space resources” transformation of approaches in the intersection.

Keywords：Code for Planning of Intersections on Urban Roads; capacity; saturation; green ratio