基于实际诱导效用最大化的可变信息板优化布设新方法

A new method for variable message sign layout based on the actual guidance effect maximization

为了合理地对城市交通流进行诱导,在现有诱导效用最大化模型的基础上,提出了一种新的基于实际诱导效用最大化的可变信息板优化布设方法.该方法主要是对原有的效用最大化模型进行改进,通过对可变信息板诱导效用的复杂性进行分析,增加了重复诱导的效用与浪费的效用参与实际效用的计算,并对诱导覆盖率和诱导重复率进行重新定义,最后设计了基于贪婪算法的信息板优化布设的函数求解方法.通过36个路段的网络实例测试,验证了该方法简单有效,可以通过分析交通流的复杂状况对信息板进行优化配置,在区域道路复杂状况和交通需求点相对确定的条件下,提高整个系统的诱导效率,因而更符合实际交通流诱导的需要.

In order to induce the urban traffic flow properly, a new optimization layout method for variable message signs based on maximization of the actual guidance effect was proposed. The repeated induction utility and the wasted induction utility were added in the calculation of the actual utility, which improved utility of repeated induction and calculation of the wasteful utility participation in actual utility. Tbis method also redefined inductive coverage rate and inductive repetition rate. Finally, a method of solving the optimum layout function of message sign based on the greedy algorithm was designed. Evidence collected from 36 road＇ segments verify that the method is simple and efficient, and capable of optimizing the allocation of the plate through the analysis of complex situations of traffic flow to increase the inductive efficiency of the whole system. Hence, it is more suitable for the needs of the actual traffic flow guidance.