A coordinated control framework and algorithm used for relieving traffic congestion in the scope of exit-ramp of the expressway and its downstream intersection

The paper proposed a new coordinated control framework and algorithm used for relieving traffic congestion in the scope of exit-ramp of the expressway and its downstream intersection. The queue of auxiliary convergence road is selected as monitoring variable in the coordinated control algorithm, and downstream intersection cycle, split and auxiliary road green time are calculated. The control variables small-step adjustment algorithm is presented. The throughput flow duration of exit-ramp by the coordinated control strategy decreases at least 10% than by the fixed control algorithm. Combined with road network delay data, the simulation results show the effectiveness of the coordinated control algorithm.