Abstract: It is very important of share ratio of freeway and other parallel highway in the same transportation corridor for the traffic forecast. This paper analyzed from the basic mechanism and it’s pursue goal, the action object and the highway properties are analyzed, including the economic level, the vehicle difference, the length difference between freeway and parallel highway, the grade difference, the traffic flow level, the traffic fee and so on. The factors analyze is very directive to define the ratio in practice.

Key words: Traffic Forecast, Share Ratio, parallel highway

摘要： 在公路可行性研究或项目评估时，同一通道内高速公路与平行辅路交通量分担比例在交通量预测中非常重要，本文以交通运输的基本机理和追求的目标为分析的出发点，系统的分析了交通运输行为主体和公路属性的各方面对该比例的影响，包括地区的经济水平、不同车型的差异性、高速公路与平行辅路的里程差、等级和路况的对比、通道的交通饱和程度、收费水平等因素，这些因素的分析对实践中该比例的确定具有较强的指导意义。

关键词: 交通量预测, 分担比例, 平行辅路