转向比例与合理干路网密度研究

建立了居民平均出行距离、转向比例、交叉口间距之间的基本关系，结合交通信号控制系统的特性，对合理的交叉口间距、路网密度进行了分析。将街区尺度、路网密度、居民平均出行距离联系在一起，指出大的街区尺度会造成较大的转向比例和绿波交通控制体系效益下降，对其他学者提出的合理交叉口间距进行了补充解释，并进一步缩小了合理干路网密度的取值范围。最后提出在规范修编中加大干路网密度的建议指标。

Discussion on Ratio of Turning and Density of Urban Arterial Street Network

Relations between average trip distance, ratio of turning, distance between intersections were put forward. According to the traffic signal controls, the reasonable distance between intersections of arterial streets and the reasonable density were analyzed. The relation of distance between intersections, density of arterial streets and average trip distance are pointed. It reinforced the conclusion of other scholars. The scope of reasonable density of arterial streets was made smaller. At last, the advice to the modification of the index for transport planning on urban road is given.