| CIVIL ENGINEERING |
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Two-lane freeway intermittent release measures in heavy fog |
| TAN Jinhua, SHI Jing |
| Department of Civil Engineering, Tsinghua University, Beijing 100084, China |
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Abstract Rear-end collisions easily occur on freeway during heavy fog. This paper presents a cellular automaton traffic model for two-way intermittent release of freeway traffic during heavy fog to quantify the influence of various measures on traffic accident reduction. Simulations show that the rear-end collision probability,fa, is reduced with longer time intervals,ht between released cars in heavy fog conditions. Then, different speed limits have different critical time intervals,hmax. Intermittent release measures can guarantee that no rear-end collisions occur when ht>hmax. However, both fa andhmax increase as the fog zone area expands and with asynchronous release in the two lanes. Therefore, freeway management can effectively control the rear-end collision risk through adopting suitable intermittent release measures from this study.
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| Keywords
intermittent release
driving behavior in heavy fog
cellular automaton
rear-end collision probability
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Issue Date: 15 September 2016
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2016,
Vol. 56
