| 1. | Traditional four - stage method divides traffic requirement forecasting into four stages . at present each model that every stage developed , generally include variables of the level of service , especially in the stages of model split and traffic assignment 传统四阶段法将交通需求预测分成四个阶段进行,针对各个阶段开发的模型,特别是方式划分和交通分配阶段,一般都包含反映交通服务水平的变量。 |