Simulation and Evaluation of Typical Scenarios of Smart Expressway based on Multi-level Traffic Cooperative Control Strategy
In order to deal with traffic congestion and vehicle delays caused by occasional traffic accidents on expressways,in the paper,fully considering the capability of smart highway to sense traffic flow and traffic events,a multi-modal collaborative hierarchical control strategy is proposed to be applied to different traffic scenarios,with Variable Speed Limit(VSL),Hard Shoulder Running(HSR)dynamic control,dynamic ramp control and upstream remote cut-off as the core.According to the proposed strategy,two typical scenarios of traffic accidents and road construction are selected,and based on VISSIM simulation software,the secondary development and parameters setting of these two events are carried out.Then the time and space occupancy indicators are used to describe the attributes of the events,including the number of occupied lanes,the location of occupied lanes and the duration of the events.By combining different background traffic,the evaluation indexes such as possible maximum queue length and delay are extracted,and the effectiveness of the control strategy is verified by simulation extrapolation.The logical framework of multi-level collaborative control strategy proposed can be used as a unified technical process oriented to the decision-making needs of highway managers in dealing with different traffic events,thus providing technical support for collaborative control of traffic in a multi-dimensional and high-density sensing environment of smart highway,which is important for improving traffic efficiency and ensuring traffic safety of highway.
smart expresswaymuti-level cooperative control strategyvariable speed limithard shoulder runningramp controlsecondary development of VISSIM
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