重大突发事件下路段中断状态判断方法

Judgment Method of Road Interrupted State Under Major Emergencies

中断率是公路网运行监测与服务的重要指标,针对现有研究中依据高速公路饱和度、设计车速和平均车速仅能判断路段缓慢或拥堵状态的问题,以及基于交通突发(阻断)事件信息判断路段中断状态时存在漏报、误报、上报不及时的问题,本文提出1种新的重大突发事件下路段中断状态判断方法.首先,提取路段一定时间段内的历史交通流量,并按照节假日、星期、小时等特征将数据进行分类;其次,计算路段交通流量在不同特征条件下的边界阈值;然后,基于高速公路电子不停车收费系统采集的车辆行驶轨迹数据,计算路段的实时交通流量;最后,判断路段是否为中断状态,如果路段的实时交通流量等于零,且路段的实时交通流量低于边界阈值,则判断路段为中断状态.以辽宁中部环线高速公路的1起重大突发事件为例,验证本文提出方法的有效性.研究结果表明,本文提出的方法能判断重大突发事件下路段的中断状态,解决了依据饱和度、设计车速和平均车速仅能判断路段缓慢或拥堵状态的问题,克服了基于交通突发(阻断)事件信息判断路段中断状态时存在的漏报、误报、上报不及时的问题,避免了路段没有中断但流量为零而被错误地判断为中断状态的情况,提高了路段中断状态判断的准确性.

Interruption rate is an important indicator of the operation monitoring and service of road network.In the existing research,the problem of slow or congested road sections can only be judged based on expressway saturation,design speed and average speed,and traffic emergencies(blocking)events.There are problems of missed reporting,false reporting,and untimely reporting when judging the interruption status of road sections by information.This paper proposes a new method for judging the interruption status of road sections under major emergencies.First,extract the historical traffic flow of the road section within a certain period of time,and classify the data according to the characteristics of holidays,weeks,hours,etc.;secondly,calculate the boundary threshold of the traffic flow of the road section under different characteristic conditions;then,based on the highway electronic non-stop the vehicle trajectory data collected by the toll collection system calculates the real-time traffic flow of the road section;finally,it is judged whether the road section is in an interrupted state,if the real-time traffic flow of the road section is equal to zero,and the real-time traffic flow of the road section is lower than the boundary threshold,then it is judged that the road section is in an interrupted state.Taking a major emergency incident on the Central Ring Expressway in Liaoning as an example,the effectiveness of the method proposed in this paper is verified.The research results show that the method proposed in this paper can effectively judge the interruption state of road sections under major emergencies,solve the problem that only the slow or congested state of road sections can be judged based on saturation,design vehicle speed and average vehicle speed,and overcome the problem based on traffic emergencies(blocking)event information to judge the interruption state of the road section,the problems of missed reporting,false reporting,and untimely reporting,avoiding the situation that the road section is not interrupted but the traffic is zero and is mistakenly judged as the interruption state,and improves the judgment of the interruption state of the road section accuracy.