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为了在交通分配中直接得到转向流量而不是通过事后推算或网络扩展获取,对常规的交通分配算法稍作修改后提出了转向流量的2种直接计算方法.第1种方法基于转向路径关系,其原理类似于路段流量的计算,适用于给出具体路径构成的交通分配算法.第2种方法利用了转向路段关系及其衍生的路段上流量守恒律,是一种改进型Dial算法.这2种方法能避免传统的诸如Fur ness,Frator模型的事后推算法以及网络扩展法在精度、稳定性和计算量等方面的缺陷,其有效性通过算例分别得到了验证.
In order to directly obtain the steering traffic in the traffic assignment instead of ex post or network extension, two kinds of direct calculation methods of the steering traffic are put forward after slightly modifying the conventional traffic assignment algorithm.The first method is based on the steering path relationship, which The principle is similar to the calculation of road traffic, which is suitable for giving traffic assignment algorithm of specific route structure.The second method makes use of the relationship of turning road and its derived traffic conservation law, and is an improved Dial algorithm. This method can avoid the shortcomings of traditional methods such as Fur ness and Frator model, as well as the network expansion method in terms of accuracy, stability and computational efficiency. The validity of the method is validated by examples.