Abstract: Mixed traffic is one of the most remarkable characteristics of transportation in Chinese cities. In order to study the phase strategies of urban signalized intersection and carry out the mixed traffic simulation of the intersection, this paper proposes a novel definition of the mixed traffic order based on the “time-space resource using” of the intersection, and establishes the mixed traffic order model. It proposes the conflicting area model based on the space resource, and the conflicting time model based on the time resource of the intersection， and the order degree of the mixed traffic is taken as a new index of evaluation for the signal control optimization. Finally, it takes the order degree and the vehicle delay as the indexes of evaluation for the optimization, uses the simulation method. A real signalized intersection is illustrated to get the optimal strategy, and it gets an optimal result after an optimal process. The result indicates that the optimal strategy evaluated by the order degree of mixed traffic and the vehicle delay is better than the former strategy evaluated by the vehicle only，and it fits to describe the mixed traffic phenomenon of China.

Key words: urban traffic, mixed traffic;signalized intersection;order degree;pedestrians and bicycles conglomeration

摘要： 混合交通是我国城市信号交叉口最为显著的交通特点之一. 为了便于研究混合交通信号控制策略，并进行混合交通流仿真，从信号交叉口“时空资源”有效利用角度，提出了信号交叉口混合交通秩序度的概念，并建立了混合交通秩序度模型. 从信号交叉口的“空间资源”利用角度，建立行人自行车聚集群与机动车冲突区域模型；从信号交叉口的“时间资源”利用角度，建立行人自行车与机动车冲突时间模型，可以作为优化混合交通信号控制策略的一个重要评价指标. 最后，以混合交通秩序度和机动车延误作为评价指标，通过仿真的方法，对实际交叉口进行了混合交通信号控制策略优化，经过方案比选得到一个优化控制方案. 研究结果表明，以混合交通秩序度和机动车延误为评价指标优化的控制方案，比以往单一考虑机动车为评价指标优化的控制方案，效果得到明显改善，更能够表征我国信号交叉口混合交通流的运行状况.

关键词: 城市交通;混合交通, 信号交叉口, 秩序度, 行人自行车聚集群