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当道路通过跨线桥下为凹形竖曲线时，应校核设计净空能否满足行车视距的要求．为此，根据技术标准要求，推导了所需凹形竖曲线的最小半径，并给出了计算示例。
When the road through the overpass under the concave vertical curve, you should check the design clearance can meet the requirements of driving range. Therefore, according to the requirements of technical standards, the minimum radius of the required concave vertical curve is deduced and an example of calculation is given.