原文传递
Speed flow and density of motorway traffic
| 题名： | Speed flow and density of motorway traffic |
| 责任者： | S O Notley, N Bourne, N B Taylor |
| 关键词： | not available |
| 学科分类： | 公路工程 |
| 摘要： | It seems intuitively obvious that the more traffic that tries to use a given section of road, the slower it must move, but the precise mechanisms behind this relationship are surprisingly elusive. The availability of large amounts of data collected automatically raises the possibility of validating theories and models. This Insight Report examines the features of some actual data and speed–flow–density relationships, and “classical” models of speed, flow and density in the context of the wealth of detailed traffic data now available. Data from detectors support the idea that average speed decreases with increasing traffic density, although the data suggest that this decrease is only significant above a certain density. Below this, speed is virtually independent of density. This is not a feature of “classical” macroscopic models, suggesting that none of them fully describes traffic over the full range of possible densities. The role of speed, flow and density in queuing theory is also examined, including a case study of modelling a moving bottleneck. |
| 出版机构： | Transport Research Laboratory |
| 提交日期： | 17 September 2009 |
| 总页数： | 38 |
| 报告类型： | 科技报告 |
| 资源类型： | 科技（咨询、行业）报告 |
| 初始创建时间： | 17 September 2009 |
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