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MONITORING FREEWAY CONGESTION USING SINGLE-LOOP MEASUREMENTS.
| 题名： | MONITORING FREEWAY CONGESTION USING SINGLE-LOOP MEASUREMENTS. |
| 作者： | Wang-Yinhai; Zhang-Xiaoping; Nihan-Nancy-L |
| 关键词： | Freeway-management-systems; Loop-detectors; Traffic-congestion |
| 摘要： | Two of the most effective approaches to the solution of congestion problems, Advanced Traffic Management Systems (ATMS) and Advanced Traveler Information Systems (ATIS) have been developing rapidly since the 1980s. Single-loop detectors are major data sources for such systems. In this study, the authors propose an approach that takes in nine consecutive 20-second interval measurements from a single-loop detector, processes these measurements, estimates speeds for 3-minute periods, and produces congestion information based on the estimated speeds. The entire procedure includes three steps: loop data preprocessing, traffic speed estimation, and congestion detection. To automate the procedure, a Freeway Congestion Monitoring System (FCMS) has been developed in C++. The FCMS can produce both speed and congestion severity curves in real time. Site data from a loop station on Southbound I-5 were applied to demonstrate the FCMS system. The system performed consistently well under both congested and un- congested conditions. After further tests, the FCMS system may be incorporated into current ATMS and ATIS systems to provide more reliable and more intuitive traffic information to transportation professionals and road users. |
| 总页数： | ITS America. Meeting (12th : 2002 : Long Beach, Calif.). Securing our future : ITS America 12th Annual Meeting and Exposition 2002 : conference proceedings. 2002. pp15 |
| 报告类型： | 科技报告 |
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