一、交通分配理论的发展 自从20世纪50年代美国对底特律大都市圈、芝加哥都市圈相继进行交通调查与规划的研究,开发了交通产生、交通分布、方式划分、交通分配四阶段的交通需求预测方法,由此开辟了城市交通规划之先河以后,交通规划理论与方法在全世界范围内迅速展开,并得到了快速发展。尤其在交通流分配这一核心技术环节上, I. Development of Traffic Assignment Theory Since the 1950s, the United States conducted research on traffic investigation and planning for the Detroit metropolitan area and the Chicago metropolitan area one after another, and has developed four-phase traffic demand forecast for traffic generation, traffic distribution, mode division and traffic distribution Method, which opened up the first precedent for urban transport planning, traffic planning theory and method in the rapid development of the world, and has been rapid development. Especially in the traffic flow distribution of this core technology,