【摘要】 根据数值计算方法的研究成果,提出了一种新的行程时间确定方法——最小二乘拟合法,即利用最小二乘拟合原理,以两调查地点的流量偏差平方和最小为目标来确定两调查地点间的行程时间。利用北京快速路系统调查数据检验了该方法的实际效果,分析了该方法的适用性:该方法适用于交通流比较稳定或者变化比较均匀的状态。最后在综合对比分析各种行程时间调查方法的基础上,对定点调查确定行程时间应采取的方法给出了具体的建议。更多还原

【Abstract】 On the base of research results about numerical calculation,a new method: least square method fit is put forward.According to the least-square principle,the time difference,which minimizes the sum of squares of deviations between the flow volumes obtained at two traffic survey stations become the least,is just the travel time between the two traffic survey stations.By applying the field data from the expressway in Beijing,the new method is verified and its application conditions are analyzed.The method is suitable for the conditions that the traffic stream runs stably or changes evenly.With an overall comparison of the different the traffic survey methods for calculating travel time,some proposals are made for the fixed spot survey.更多还原