城市快速路施工区行车环境复杂,不仅是城市道路的瓶颈区域,亦是城市道路的事故多发点,因此存在较大的安全隐患.本文通过应用仿真方法,设计施工区的警示系统,以达到合理警示车流、提高施工区的安全和效率的目的.首先分析施工区的危险因素,再选取冲突率和交通量分别作为安全和效率指标,最后应用vissim仿真平台设计试验,探索不同因素对施工区的安全和效率的影响.试验结果表明,施工区的交通需求、大车率和驾驶员对限速值的服从率对施工区的通行效率和安全都具有较大的影响.基于仿真试验结果,应用模糊C均值聚类对警度的阈值进行确定,进而对施工区的警示系统进行设计.%The construction area of urban expressway traffic environment is complex, it' s not only the bottleneck area of urban road, but also the accident black point, and therefore it involves security problems. The simulation method was used and the warning system was designed in order to warn traffic reasonably and enhance the safety and efficiency of construction area. First risk factors in construction area were analyzed, then collision rate and traffic volume were selected as the safety and efficiency index respectively, finally the vissim simulation test plat-form was applied to explore the influence of different factors on the safety and efficiency of construction area. The simulation results show that traffic demand, the large vehicle mix rate and driver' s compliance rate have great influence on the traffic efficiency and safety of construction area. Based on the simulation results, the fuzzy C-means clustering was used to determine alarm grade threshold, and the warning system of construction area was designed finally.
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