针对干线协调交叉口多个相位有公交车到达的情况，为降低公交车延误，建立了以不破坏协调绿波带为前提的多相位公交优先控制策略．在该策略中，提出了“就近原则”以解决多个相位的公交优先申请冲突，对公交优先级别进行排序，并建立了多相位公交优先控制流程; 考虑最高优先级别公交车的不同相位属性，采用绿灯延长和绿灯提前起亮两种优先方式，分别建立了协调相位公交优先算法以及非协调相位公交优先算法．最后以某市两个干线相邻交叉口为例，在VISSIM 中编程验证了所建算法的有效性，并与无公交优先、单相位公交优先算法进行对比，结果表明: 多相位公交优先更有利于降低路网所有公交车延误，并限制社会车流延误的增加．

In order to reduce the bus delay due to the meeting of several buses from different phases at an intersection with arterial coordination,a multiple-phase bus signal priority ( MPBSP) strategy without damaging the coordination of green wave band is proposed. In this strategy,“proximity principle”is presented to settle the conflicts among priority requests for multiple phases and determine the optimal priority sequence. Then,a multiple-phase bus
priority control procedure is established. As the bus with highest priority may belong to different phases,the green extension and the green-early-start are adopted to respectively establish the coordination phase and non-coordination phase BSP( Bus Signal Priority) algorithms. Finally,by taking two neighboring intersections on arterial roads in a city as case studies,the effectiveness of the proposed strategy is verified through VAP in VISSIM. In addition,the MPBSP strategy is compared with the non-BSP and single phase BSP ones. It is found that the MPBSP strategy can reduce all the bus delays of road networks more efficiently and limit the increase of average delay of general traffic.