Abstract

Info

Author(s):: LI Shu-guang; WEI Jing-ya; SHE Sheng-jun; School of Electronic and Control Engineering, Chang’an University, Xi’an 710064, Shaanxi, China

Keywords:: traffic engineering; bus priority; physical queue; adaptive control; genetic algorithm

Abstract:: Regarding the green traffic control problem at single point intersections, an adaptive bus priority signal control method was presented with consideration of the physical queues of cars and buses on links. Firstly, a dynamic traffic model that could simulate the physical queues of vehicles was described considering the interaction between cars and buses. The flow conditions on link were divided into two classes: one was the un-congested condition, where buses and cars were in flow state; the other was congested condition, where buses and cars were intertwined together. Furthermore, the calculation method of buses and cars delay was proposed, and on this basis, the optimal green ratio was calculated according to average person delay. Finally, the optimized result of bus priority signal was given under several congested conditions. The results show that it is meaningless to consider bus priority under low congested condition. The signal method can improve the passengers’ travel time and link queue under mid-congested conditions. The optimal green ratio is better than fixed green ratio under over-congested conditions. Optimal green ratio considering the effects of accidents can obtain more benefits than the fixed green ratio under different congested conditions.