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【多选题】
缓和曲线的作用有 ( )
A.
可作为超高过渡段,起到超高缓和的作用
B.
可作为加宽过渡段,起到加宽缓和的作用
C.
使离心加速度逐渐变化,起到行车缓和的作用
D.
通过其曲率的逐渐变化,使整个公路线形能更好地适应汽车转向操作的需要
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