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A Risk-Based Multiobjective Optimization Framework to Enhance the Safety of Horizontal Curves with Limited Sight Distance
| 题名： | A Risk-Based Multiobjective Optimization Framework to Enhance the Safety of Horizontal Curves with Limited Sight Distance |
| 正文语种： | eng |
| 作者： | Khalil, Mohamed Gamal;Hussein, Mohamed |
| 作者单位： | McMaster Univ Dept Civil Engn 1280 Main St West Hamilton ON L8S 4L7 Canada;McMaster Univ Dept Civil Engn 1280 Main St West Hamilton ON L8S 4L7 Canada |
| 关键词： | Reliability analysis;Multiobjective optimization;Redimensioning of cross-sectional elements;Limited sight distance |
| 摘要： | This study introduces a multiobjective optimization framework for the redimensioning of the cross-sectional elements of rural horizontal curves with limited sight distance. The optimization aims at minimizing both the risk associated with the limited sight distance and the expected collision frequency corresponding to the cross-sectional elements' dimensions. The risk component was assessed using an index known as P-nc, which is developed based on reliability theory using the First-Order Reliability Method (FORM). The change in collision frequency corresponding to the change in the cross-sectional elements was extracted from the literature. The risk and the safety components were then combined into one measure, a combined crash modification factor (CMFcombined), to develop a direct measure of the safety impacts of the optimization. The proposed framework was applied to five restricted curves in British Columbia, Canada, considering various scenarios. The results showed a considerable reduction in the P-nc, value (ranging from 12% to 73%), the expected collision frequency (ranging from 10% to 31%), and the estimated combined collision reduction CMFcombined (ranging from 48% to 76%). The framework presented in this study would support transportation engineers in selecting optimal dimensions of cross-sectional elements of restricted horizontal curves, understanding the safety consequences of selecting a specific cross-sectional configuration, and assessing the economic viability of different design options. (C) 2022 American Society of Civil Engineers. |
| 出版年： | 2022 |
| 期刊名称： | Journal of Transportation Engineering |
| 卷： | 148 |
| 期： | 3 |
| 页码： | 04022002.1-04022002.10 |
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