Rapid allocation of large-scale dynamic traffic flow under enclosure construction conditions

In order to solve the problems of long single dynamic allocation time, high memory occupation, and high DDR in traditional traffic flow allocation methods, a rapid allocation method of large-scale dynamic traffic flow under enclosure construction conditions is proposed. Analyze the characteristics of traffic flow in the construction area and its spatiotemporal impact mechanism on path impedance, construct a fusion BPR function and an improved cellular transmission model to calculate the mixed impedance, and then establish a dynamic user optimal allocation model with the goal of minimizing the total impedance of the system. Design a heuristic iterative algorithm for fast solution and achieve rapid flow allocation. The experimental results show that after the proposed method is applied, the single dynamic allocation calculation time in a medium-sized road network is less than 312s, the memory occupation is 4.2GB, and the DDR always remains at a low level, proving its good adaptability.