中文摘要：

随着智能交通运输系统对道路实时交通信息的迫切需求，布设高密度、全方位的交通检测器已成为共识，但是高密度的检测器布设带来的是硬件投资的急剧增加，因此有必要进行检测器布设密度的优化。利用快速路行程时间估计方法分析了检测器布设密度优化问题，认为从行程时间估计误差和合理投资的角度出发，检测器布设并不是密度越大效果越好，而是存在一个合理范围，该范围可以指导工程中实际检测器数目的选择。

英文摘要：

With the urgent demand for real-lime traffic information in Intelligent Transportation System, the high-density layout of detectors has been adopted, while the amount of investment has been sharply increased, So optimum detector layout density is necessary. The optimum method based on travel time estimation has been expounded.The major conclusions could be summarized as follows： considering the appropriate estimation error for travel time and reasonable investment, the space between detectors should have a suitable range and the high-density layout of detectors is not always good for ITS system.The method for selecting suitable range could be introduced to determine detector density and detector amount in practical apphcations, then according to this range the optimum detector layout density can be achieved.