关键词: ITS, 交通数据, 质量控制, 自由流车速

Abstract: Theory hypothesis is the premise of this paper. The conclusion that “Free Flow Speed” is a stable value in a fixed section of a highway has been drawn depending on the theory hypothesis and analyzing by making use of statistics. This important result can help us move forward to screening questionable loop detectors which have some problems with them and produce distorted data. Threshold values limitation and clustering approaches are used in this paper to exclude and select questionable loop detectors relying on the stable traffic parameter. And initial criterions to screen questionable loop detectors come into being with the help of these approaches and common practice. Experiments have been designed to approve the validity of these initial criterions. Then several necessary experiments in different situations are successfully carried out to validate and adjust the initial criterions. At last, the reliable determinant criterion is concluded after analyzing the results of the experiments. The results of the experiments show that this method is feasible and proper in screening questionable loop detectors based on the mass archived traffic data.

Key words: ITS, traffic data, quality control, free flow speed