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为了对高速公路交通事故条件下的行车安全作出合理评估,通过对交通事故下的变换车道行为进行分析,发现恰好满足不与前车追尾又不与后车相撞即临界条件下的变换车道行为更容易引发交通事故,故选取临界条件下的变车道行为即交通冲突作为交通事故下行车安全的评估指标;采用改进的换车道规则和NaSch模型的跟车规则进行车辆位置和速度更新,根据交通流状况采用相应的车辆到达规律,分别输入不同的大车比例和饱和度仿真参数,从而对交通事故下高速公路混合车流进行仿真。研究结果表明:不同的大车比例和饱和度下的交通冲突数反映了高速公路行车安全状态,据此将交通事故下高速公路行车安全等级划分为较危险、危险、安全、较安全4个等级;最终得出一种交通事故中车辆变换车道行为下的行车安全的评估方法。
In order to make a reasonable assessment of the traffic safety under the traffic accident conditions, by analyzing the lane changing behavior under the traffic accident, it is found that the lane change behavior that meets the critical condition that does not collide with the rear-end collision or the rear-end collision Traffic accidents are more likely to be caused. Therefore, traffic lane changes under the critical condition are selected as traffic safety indicators in traffic accidents. Vehicle position and speed are updated by using lane changing rules and follow-up rules of NaSch model. According to traffic The flow conditions adopt the corresponding law of vehicle arrival, and enter the different simulation parameters of the ratio and saturation of the cart respectively, so as to simulate the mixed traffic flow of the expressway under the traffic accident. The results show that the number of traffic conflicts under different truck proportions and saturations reflects the driving safety status of expressways. Based on this, the driving safety levels of expressways under traffic accidents can be classified into four levels: dangerous, dangerous, safe and safer Finally, a traffic safety assessment method of traffic safety under the condition of changing lanes is obtained.