With K-means clustering method and Expectation Maximization (EM) Algorithm,an eigenvector was extracted to describe the traffic status of an intersection .

• 本文通过对区域内路口大量的检测器数据的分析,利用K均值聚类和EM算法相结合的方法,提取出表征路口交通流运行状况的特征向量。