The camber is the curvature of the cross section and the crown is the highest point of the camber. A vertical curve, clothoidic or parabolic, occurs at a change of gradient.

• 图中向上倾斜部分是路拱,该部分的最高点是路脊。坡度变化时,出现了一个回旋曲线式的或者抛物线式的垂直曲线。