十二、纵坡 1.最大纵坡的确定公路设计应使汽车在全路线均匀地运行。运用计算行车速度,将各项公路几何特征相互联系,就是达到这一目的的手段。对许多公路特征都已定出一些设计数据,并取得比较一致的认识,但在行车道纵坡与计算行车速度的关系方面却没有定论。 12, longitudinal slope 1. Determination of the maximum longitudinal slope Highway design should make the car running evenly throughout the route. Calculating the speed of travel and linking the geometrical features of the various roads with each other is a means to this end. Some design data have been set for many road features and have gained a relatively common understanding. However, there is no conclusion as to the relationship between the longitudinal gradient of the driving lane and the calculation of driving speed.