1.Key Laboratory of Transport Industry of Big Data Application Technologies for Comprehensive Transport,Ministry of Transport,Beijing Jiaotong University,Beijing 100044,China
2.Municipal Engineering Department,China Academy of Urban Planning & Design Shenzhen Branch,Shenzhen 518040,China
3.Institute of Highways,Planning and Research Institute of the Ministry of Transport,Beijing 100028,China
Based on truck and private car trajectory data, a trip group classification method using Clustering by fast search and find of density peaks(CFSFDP) was proposed, in which seven trip indicators—including trip start time, trip end time, and total operation duration—were employed as feature variables. The trucks and private cars were respectively divided into three trip groups. A BP neural network-based vehicle trip group identification model was subsequently established, with trip characteristic indicators serving as inputs and the density clustering algorithm's classification labels as outputs, thereby enabling rapid identification of different trip groups within the same vehicle type.The results indicated that the proposed CFSFDP-BP-based trip group classification and identification method demonstrated satisfactory prediction accuracy and reliability. An identification accuracy of 0.991 was achieved for truck trip groups, while 0.988 was obtained for private car trip groups, with superior performance observed for truck trip group identification compared to private cars. Three distinct truck trip groups were identified: flexible-low intensity, traditional-medium intensity, and traditional-high intensity. Meanwhile, three private car trip groups were classified as commute-low intensity, commute-medium intensity, and flexible-high intensity. These findings are expected to support traffic management authorities in formulating refined traffic management strategies and improving traffic operational efficiency.
Rodriguez等[18]于2014年在《Science》上提出了基于密度峰值的聚类算法(Clustering by fast search and find of density peaks),即CFSFDP聚类算法。该算法可以一次性找出聚类中心,且对数据形状的适应性较高。与其他基于密度的聚类算法相比,该算法需要输入的指标更少,不需要迭代,运行效率更高。因此,本文采用CFSFDP聚类算法,用于货车与私家车的出行群体分类。
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