The results of the analysis show that the highway longitudinalgrade had little influence on pavement performance.
分析结果表明，公路纵坡对路面结构受力的影响不明显。
2
The existing highway design criterion only takes setting pavement longitudinalgrade, side ditch and drainage ditch into account in order to eliminate surface water.
现有的公路设计中，考虑较多的仅仅是通过设置道路的纵坡、边沟及排水沟等设施来排除地表水。
3
By analyzing the relationship between speed loss, speed discount in different gradient and grade length, the paper also brings forward the maximum longitudinal gradient and grade length limit.