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Assessment of freeway work zone safety with improved cellular automata model 被引量:4
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作者 Guohua Liang fengjing wang +2 位作者 Wei wang Xiaoduan Sun Wugong wang 《Journal of Traffic and Transportation Engineering(English Edition)》 2014年第4期261-271,共11页
To accurately assess the safety of freeway work zones, this paper investigates the safety of vehicle lane change maneuvers with improved cellular automata model. Taking the traffic conflict and standard deviation of o... To accurately assess the safety of freeway work zones, this paper investigates the safety of vehicle lane change maneuvers with improved cellular automata model. Taking the traffic conflict and standard deviation of operating speed as the evaluation indexes, the study evaluates the freeway work zone safety. With improved deceleration probability in car-following rules and the addition of lanechanging rules under critical state, the lane-changing behavior under critical state is defined as a conflict count. Through 72 schemes of simulation runs, the possible states of the traffic flow are carefully studied. The results show that under the condition of constant saturation traffic conflict count and vehicle speed standard deviation reach their maximums when the mixed rate of heave vehicles is 40%. Meanwhile, in the case of constant heavy vehicles mix, traffic conflict count and vehicle speed standard deviation reach maximum values when saturation rate is 0.75. Integrating all simulation results, it is known the traffic safety in freeway work zones is classified into four levels: safe, relatively safe, relatively dangerous, and dangerous. 展开更多
关键词 work zone cellular automata model conflict count safety classification speed standard deviation
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