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Phase based jam warnings: an analysis of synchronized flow with floating car data
| 题名： | Phase based jam warnings: an analysis of synchronized flow with floating car data |
| 正文语种： | 英文 |
| 作者： | Sven-Eric Molzahn;B. S. Kerner;H. Rehborn |
| 作者单位： | Daimler AG |
| 关键词： | Empirical traffic flow; floating car data (probe vehicle data); jam warning; synchronized flow; three-phase traffic theory |
| 摘要： | Based on an empirical study of floating car data (probe vehicle data), we have found the following microscopic features of empirical synchronized flow that are releva nt for jam warning methods: (i) In accordance with Kerner's three-phase traffic theory, the empirical speed decrease (speed drop) denoted by Av that occurs due to vehicle deceleration at the upstream front of synchronized flow is a complex time function. (ii) The empirical function Av can be considered a "jam at which different vehicles exhibit sometimes very differ-ent speed drops Av occurring at different road locations. Because each of the vehicles decelerates within the "jam wall" at different road locations, the "jam wall" moves in space and in time, (iii) The spatiotemporal structure of the empirical "jam wall" is determined by alternations of the synchronized flow and wide moving jam traffic phases at the upstream front of a congested traffic pattern, (iv) During some time intervals, the "jam wall" can disappear and then it can appear once more, and so on; during "jam wall" disappearance, one or a few vehicles can pass a bottle neck while moving in free flow. These empirical findings can be importa nt for the development of reliable jam warning methods as well as other ITS-applications. |
| 出版日期： | 2020 |
| 出版年： | 2020 |
| 期刊名称： | Journal of Intelligent Transportation Systems Technology Planning and Operations |
| 卷： | Vol24 |
| 期： | No01-06 |
| 页码： | 569-584 |
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