Collaborative Optimization Model for Bus Eco-speed Guidance and Transit Signal Priority Strategy
Due to the difference of optimization objectives between transit signal priority and eco-driving,the research gap of effectively integrating the two strategies for improving both operational the efficiency and environmental benefits exists.To address such issue,a joint model for simultaneously optimizing bus eco-speed guidance and timing plan of transit signal priority is proposed.To this end,the objective is to minimize the intersection delay for both buses and general traffic,bus fuel consumption,and deviation between the actual bus arrival time and timetable.Then,a rolling horizon-based approach is employed to solve the proposed model by including the constraints of the vehicle motion state,bus stop operation,and traffic signal.Simulations and real-world tests are both conducted to verify the effectiveness of the proposed model,while the sensitivity analysis is performed on transit flow and general traffic flow where the results reveals the merits of proposed models in general.Specifically,varying from bus flow and general traffic flow,the reduction of intersection delay per bus can be up to 31.99％and 23.13％respective,while the decrease of fuel consumption per bus can reach to 12.66％and 9.61％respectively,meanwhile,the averaged intersection delay for general traffic can also reduce by 8.23％.The results of a real-world test in Chongqing city suggest that the proposed model ensures bus punctuality and significantly reduces the fluctuation of bus speed,while the fuel consumption,bus delay,and general traffic delay are improved by 7.04％,32.61％,and 4.37％,respectively.Consequently,the proposed model can maximize the integrated benefits of transit priority and low-carbon transit system while ensuring stability of bus operation,as well as to mitigate the side effects of transit priority on general traffic to some extent.
traffic engineeringeco-drivingrolling planningconnected bustransit signal priority
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