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Defining, Measuring, and Modeling Capacity for the Highway Capacity Manual
| 题名： | Defining, Measuring, and Modeling Capacity for the Highway Capacity Manual |
| 其他题名： | Bertini,R.L.,and Leal,M.T.(2005)."Empirical study of traffic features at a freeway lane drop."J.Transp.Eng.,10.1061/(ASCE)0733-947X(2005)131:6(397),397–407. |
| 正文语种： | 英文 |
| 作者： | Alexandra Kondyli |
| 关键词： | Traffic capacity;Urban areas;Rural areas |
| 摘要： | The highway capacity manual (HCM) is the publication used most often to estimate capacity. Field measurements in previous research have shown that the capacities at several freeway bottlenecks are noticeably lower than the values recommended in the HCM (highway capacity manual), by an order of a few hundred vehicles per lane. In addition, several articles have shown that maximum freeway throughput may differ between undersaturated and oversaturated conditions. This paper assembles capacity flows before and after the initiation of oversaturation, discusses recommended definitions of capacity, and provides capacity values and capacity prediction models for various types of freeway segments. It is recommended to define prebreakdown capacity as the 85th percentile of the 15-min average prebreakdown flow and the postbreakdown capacity as the 85th percentile of the 15-min average discharge flow. A clear drop in throughput between prebreakdown and discharge capacity values was observed. The paper concludes by providing recommended capacity values as a function of the number of lanes and the segment type. These values are significantly lower than those recommended in the HCM (highway capacity manual) for basic freeway segments. |
| 出版年： | 2017 |
| 论文唯一标识： | P-72Y2017V143N03007 |
| 英文栏目名称： | TECHNICAL PAPERS |
| doi： | 10.1061/JTEPBS.0000017 |
| 期刊名称： | Journal of Transportation Engineering |
| 拼音刊名(出版物代码)： | P-72 |
| 卷： | 143 |
| 期： | 03 |
| 页码： | 50-61 |
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