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随着城市中心商业区的快速发展，其造成的城市交通拥堵已经成为影响居民出行和城市发展的严重障碍.本文以城市中心商业区的混合交通流为研究对象，建立了基于动态分配的交通流诱导优化模型.首先，基于总体费用函数的路径选择概率对城市中心商业区的交通流进行动态交通分配.然后，根据分配结果确定拥堵路段，据此给出不同交通诱导措施，再应用所建模型选择最佳方案.最后，采用VISSIM交通仿真软件，对天津市滨江道商业区的混合交通流进行动态仿真，并针对不同的交通诱导措施，应用所建模型对诱导方案进行仿真和评价，确定最优方案，从而有效地减少交通拥堵.

Optimizing Model and Simulation for Mixed Traffic Flow Guidance Measures of Urban CCD

As the city’s economic and cultural center, the urban central commercial districts (CCDs) will undergo dramatic changes, which will also bring heavy traffic jams to the city. In this paper, the mixed traffic flow of CCDs is analyzed, and the traffic flow guidance optimizing model is formulated. According to the route selection probability based on the overall travel cost function, the traffic flow is allocated to the road network of the CCDs by dynamic assignment model, and the heavy traffic roads are identified. Then, the mixed traffic flow guidance measures are presented, and the proposed model is applied to select the optimal measure. Finally, with the VISSIM simulation software, the model is applied to the mixed traffic flow of the Tianjin Binjiangdao CCD, which proves the effectiveness of the satisfied guidance measure.