通过速度折减量与坡长之间的关系曲线，提出基于运行速度差和满足公路服务水平要求的各级公路最大纵坡坡度与坡长限制值。
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 .
最大纵坡度