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Coordinated control strategy between entrance ramp of city expressway and upstream intersection

For the purpose of relieving the jamming problem in the connection area between the entrance ramp of urban expressway and the upstream intersection, this paper proposes an optimized coordinated control model coupled with the traffic flow prediction model of the connection area. The model is divided into three sub-models: traffic flow model of the connection area, traffic flow prediction model of the connection area and optimized coordinated control model of the connection area, respectively. The case simulation shows that, compared with the fixed-cycle control model, the optimized coordinated control model coupled with the traffic flow prediction model of the connection area optimizes the queue length of the on-ramp, the average queue length of the east entrance and others of the upstream intersection, and the average delay of the connection area by 31.58%, 40.14% (11.63%), and 27.04%, respectively. Compared with the optimized coordinated control model not coupled with the traffic flow prediction model of the connection area, the model is optimized by 13.33%, 26.09% (8.43%), and 3.96%, respectively. Therefore, the optimized coordinated control model coupled with the traffic flow prediction model of the connection area greatly improves the operation efficiency of the connection area.