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Improved Volume-Delay Function for Two-Lane Rural Highways with Impact of Road Geometry and Traffic-Flow Heterogeneity
| 题名： | Improved Volume-Delay Function for Two-Lane Rural Highways with Impact of Road Geometry and Traffic-Flow Heterogeneity |
| 正文语种： | eng |
| 作者： | Saric, Ammar;Lovric, Ivan |
| 作者单位： | Univ Sarajevo Fac Civil Engn Patriotske Lige 30 Sarajevo 71000 Bosnia & Herceg;Univ Mostar Fac Civil Engn Mostar 88000 Bosnia & Herceg |
| 摘要： | Two-lane rural highways represent the absolute majority of road networks globally, but there is a noticeable lack of research on this type of road for traffic planning purposes. This paper presents the relationship between average flow speed on two-lane rural highways and traffic volume and composition, and roadway horizontal and vertical geometric characteristics, expressed in the form of a volume-delay function. A new volume-delay function was developed through a combination of field research and traffic microsimulation. Field research was conducted on the main road network in Bosnia and Herzegovina. In total, more than 1 million simulations of different traffic situations were performed in an automated process. The results showed that a combination of traffic composition and geometric features (bendiness and longitudinal grade) has a crucial impact on average flow speed. The new proposed model predicts average flow speed in various traffic situations with high reliability (R-2 = 0.77), compared with R-2 = 0.26 for the widely used Bureau of Public Roads (BPR) volume-delay function. (C) 2021 American Society of Civil Engineers. |
| 出版年： | 2021 |
| 期刊名称： | Journal of Transportation Engineering |
| 卷： | 147 |
| 期： | 10 |
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