关于城市道路合理间距理论推导的讨论

城市路网是城市交通与城市发展的骨架,对合理路网间距的认识是路网规划的关键。但对合理路网间距的认识存在若干观点,致使路网间距的合理取值范围较大。目前城市规划与交通工程专业书籍中经常提及的是路段通行能力的交叉口间距折减系数法和最佳公交线网密度分析法。本文采用逻辑推理的方法,指出路段通行能力的交叉口间距折减系数分析存在逻辑错误,公交最佳路网密度缺乏应有的应用前提分析,这些不足是导致我国城市路网密度不足的重要原因之一。

Discussion on Theory about Reasonable Distance between Road Intersections

Road network is important for the development of city. Reasonable distance between road intersections is important to design a good road network. But different points exit in China. The advised spacing value of urban road network has a big range. In professional books on urban planning and traffic engineering, the theory about capacity of road section that is affected by the distance between intersections. The theory of best density of public transport network was often mentioned. But the theory about capacity of road section that is affected by the distance between intersections has logistic mistake. The use of best density of public transport network lack of premise analysis in the theory to find reasonable spacing between road intersections. It is one of the important reasons why the road network is so sparse in most cities of China.