介绍高等级公路平面线形设计、纵断面线形设计，以及平、面线形的组合设计。
Combined with the alignment design of Taichang Expressway, the paper introduced some experience of horizontal and longitudinal alignment combination.
纵断面设计是道路线形设计中的重要组成部分，纵断面线形的设计质量在很大程度上决定着道路的安全性与使用功能的好坏。
Vertical section design is a important part in road line design, the quality of vertical section line determine the security and function of the road.
而山区公路分离式断面路线设计的重点是纵断面设计，在纵断面线形设计中通常使用两项控制参数：容许最大纵坡和最大容许坡长。
The emphasis of montane highway design is vertical alignment's design, there are usually two controls parameters: concessional maximal longitudinal and concessional maximal length of grade.
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