中文摘要：

文章以相关有向环图的结论为基础，建立了一种能够获取路网上各路段的流量的检测器布设方法。该方法首先通过模糊综合评价方法确定优先顺序集合，从而在有向环上选取最优的弧进行检测器布设。该方法具有弧的选择指导性强、能充分考虑交通系统中每条路线内部的交通状况等优点。

英文摘要：

Based on some conclusions of directed circle,a detector placement method that can get segment volume on-line is established.This method first determines priodty in the collection through fuzzy evaluation, in order to select the optimal arc in directed circle.In addition, this method has arc directivity, and can take full account of advantages of every segments n transportation system.