Coupling Analysis And Control Strategy Of Signalized Intersection And Its Adjacent Bus Stop

In recent years, urban traffic condition is worsening, traffic congestion has become a serious urban problem. The bottleneck in the urban road network influences the normal operation of traffic, the formation of traffic congestion is often relevant to the bottleneck. The signalized intersection with its adjacent bus stop constitutes a combined bottleneck, it is very meaningful for alleviating traffic congestion to investigate this combined bottleneck.By using a two-lane NaSch model, the combined bottleneck model has been built considering operation characteristics of car and bus on the combined bottleneck of the signalized intersection with its adjacent bus stop. The effect of the split on the coupling effect of the combined bottleneck is studied, with respect to the location of bus stop, the traffic structure and the lane-changing behavior of bus before reaching the stop. The relative control strategy of the combined bottleneck is researched. The main results are derived from above researches:(1)For the case that the bus stop is set at the upstream of the signalized intersection(Case 1), the split is the key influential factor of the formation of the combined bottleneck, the location of bus stop and the traffic structure affect average speed and congestion scale of the combined bottleneck significantly, the bus changes lane ahead of schedule before reaching the stop can improve traffic condition of the combined bottleneck effectively. The distribution of straight vehicles is chiefly effected by the percentage of the turn car, and is not basically linked with the split, the location of bus stop and the percentage of the straight vehicle.(2)For the case that the bus stop is set at the downstream of the signalized intersection(Case 2), the coupling effect of the combined bottleneck is essentially the same as the Case 1. Compared with the Case 1, average speed and congestion scale of the combined bottleneck increases and decreases remarkably when the split is small(?=0.3), respectively. But there is no significant change in average speed and congestion scale of the combined bottleneck with the decrease of the location of bus stop or the length of lane-changing area before reaching the stop.(3)Taking the bus before reaching the stop as the controlled object, the two control strategies of the combined bottleneck are presented and validated by the simulation.