Green Wave Coordinated Design Method for One-way Traffic Network

To improve the operation efficiency of one- way traffic networks, this paper proposed a green wave coordinated control method. Firstly, the characteristics of different one-way traffic loops were analyzed. Considering the pedestrian phase, the constraint between the link traveling time and the signal timing parameters in the one-way traffic loop was established, and the calculation formulas of the bias-split were derived. The common signal cycle optimization algorithm was proposed by minimizing the average bias-split of all roads. Then, the relationship between the bias-split and the bias-time of each road was analyzed, and the bias-split was allocated to each one-way road according to the constraint relationship, and the calculation method of green wave bandwidth was derived. Next, the split of the intersection was optimized with the goal of maximizing the bandwidth percentage. The offset calculation method was proposed, and the signal coordination control scheme of the one-way traffic network was obtained. Finally, taking a 3×3 one-way traffic network as an example, the results show that the signal timing scheme obtained by this method has an obvious green wave effect, and it has the proportion of bandwidth of all intersections more than 70%, which is better than the SYNCHRO scheme. The VISSIM simulation results of the three different flow conditions in the unsaturated state show that compared with the SYNCHRO scheme, the average delays of through vehicles in the traffic network are reduced by 9.0%, 16.4%, and 26.1% respectively, and the average stops of through vehicles arereduced by 31.2%, 48.8%, and 41.6%, respectively. The service level of the traffic network is significantly improved, which shows the feasibility and superiority of this method.