基于交通冲突技术的匝道交织区交通安全评价

Traffic Safety Evaluation of Ramp Intertwined Areas Based on Traffic Conflict Technique

为分析山西省晋城东互通匝道交织区的交通安全状况,基于交通冲突技术,采用VISSIM交通微观仿真与安全替代评价模型SSAM相结合的方法,对交织区安全性进行评价,结果表明,随着交通量的增长,交通冲突数不断增加,交通冲突率初期呈同步上升态势,在交织区服务水平趋于饱和后,交通冲突率出现下降趋势。最后提出利用周边路网合理分流、增加交织区长度、增设交织区辅助车道和限速的措施来改善设计方案,以提高行车安全性,为其他公路安全性设计提供借鉴。

To analyze the traffic safety situation in the ramp-intertwined area of East Jincheng Interchange in Shanxi Province,based on the traffic conflict technique,this paper combined VISSIM traffic micro-simulation and Safety Alternative Assessment Model(SSAM)to evaluate the safety in the intertwined area.The results showed that,with the increase in the traffic volume,the traffic conflict number increased,and the traffic conflict rate initially showed a simultaneous increase and then a decrease after the service level in the intertwined area became saturated.Finally,to improve driving safety,this paper proposed measures to enhance the design scheme such as reasonable diversion by utilizing the surrounding road network,increasing the length of the intertwined area,and adding auxiliary lanes and speed limitations in the intertwined area,expecting to provide a reference for the design of the safety of other highways.