均衡流量和饱和度的交通瓶颈控制

Traffic bottleneck control with flow equilibrium and saturation equilibrium

为快速疏散交通瓶颈,提出一种均衡流量和饱和度的交通控制方法.首先,利用过车数据获得各路段与瓶颈的关联度,据此得到相关路段,并依据路段剩余空间和排队增长趋势确定可控与不可控路段;其次,依据瓶颈的流量和排队长度,确定总消散量,并分配到可控路段上;可控路段再依据约束条件动态调节分配量,并进行绿灯时长优化;同时不可控路段将多余流量均衡到周边路段;然后,以饱和度均衡为目标进行配时优化.从而,该方法可消散已识别瓶颈,消除潜在瓶颈.最后,通过仿真实验对所提方法的有效性进行了验证.

In order to evacuate traffic bottleneck, a traffic control method aims at flow equilibrium and saturation equilibrium is proposed. Firstly, the relevancies between the other roads and bottleneck are calculated by analyzing passing record of vehicles, according to which the related roads are obtained, and the controllable and uncontrollable roads are identified based on the remaining capacity of the related roads and the growth trend of queuing;Secondly, by calculating queue length and flow of bottleneck, total flow that need to be adjusted is obtained and assigned to controllable roads. For each controllable road, real allocation of flow is adjusted dynamically taking consideration of constraints, and green time is optimized;At the same time, for each uncontrollable road, extra traffic flow is assigned to surrounding roads;Then green time is optimized to achieve saturation equilibrium. Thus, this method can dissipate the identified bottlenecks and eliminate the potential bottlenecks. Finally, the effectiveness of the proposed method is verified by simulation experiments.