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In this paper, upgrade section was classified based on linear combination form and whether or not constructing the climbing lane. Traffic accident characteristics on the upgrade section were analyzed from the viewpoint of vehicle type, accident type and time distribution. For in-depth study of accident causes, the paper analyzed traffic flow operation characteristics and discussed main influencing factors of traffic flow situation. In addition, the influence zone of upgrade section was put forward and defined. This laid good foundation for follow-up study on influence mechanism between microscopic traffic flow operation characteristics and traffic safety. Finally, the corresponding safety improvement measures were proposed

Research on Traffic Safety of Freeway Upgrade Section