Interchange Traffic Safety Evaluation Model Based On Traffic Conflict Technology

Highway interchanges exports are often the "bottleneck" section of the whole highway system, the vehicle near the export frequently change lanes, traffic flow state of mixed operation or close to mixed operation. Because of the complexity of the driving behavior, interchanges export area is a traffic accident prone locations, therefore, to ensure the safety of export transport interchanges, has become a problem urgently to be solved in our countryFirstly, combined with the conditions of our country exit ramp combination classification and statistics each combination of common, clear the focus of this article research object; Through the measured data and research results, using the combination of subjective and objective method, classifying traffic conflict, and threshold values of traffic conflict; Respectively from the triage area, middle and downstream traffic volume, speed, parameters such as lane change behavior research, distribution characteristics of different cross section parameters were analyzed, and calculated the interchanges export; the change rule of traffic flow characteristics By analyzing the simulation results of different traffic flow parameters and road geometry design index and the traffic conflict relationship, based on the curve regression and multivariate nonlinear regression analysis method, set up all kinds of traffic conflict regression model; Comprehensive risk index as to evaluate the comprehensive indicators of traffic conflict, and apply the concept of safety service level of the safety status of interchanges export for grading. Through the classification of sigma theory approach are per level security services division standard of water and its qualitative description,provides a new method for the interchanges export evaluation, to improve the safety of the highway interchanges, improve the traffic capacity and service levels provided technical support.