In general, there are two sorts of strategies of energy saving and CO2 emissions reduction in transportation systems using wireless sensor network for transportation. They are single-level optimization solutions and the bi-level optimization ones. The bi-level optimization solutions are considered a sort of optimization in both road side unit (RSU) side and on-board unit (OBU) one. However, the single-level optimization solutions are considered optimization only in RSU or OBU side. A bi-level optimization model with Genetic Algorithm/Particle Swarm Optimization (GA/PSO) hybrid algorithm is proposed to improve performance instead of non-hybrid algorithms. The upper-level optimization model considers the real-time traffic characteristics of the traffic flows near the signalized road intersection. At the same time, vehicles in the lower-level optimization model retrieve the real-time traffic signals using vehicular networks. Then, the traffic signals update the schedule and the vehicles motion states for greener environment factor respectively. Simulation results indicate that the GA/PSO hybrid algorithm performs much better than non-hybrid ones especially when the traffic is heavy. The fuel consumption and CO2 emissions are greatly reduced.
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