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本文详尽地推演了公路凸型曲线中的缓和曲线长度Ｌ_(0)和圆曲线半径Ｒ的计算公式。使公路凸型曲线计算大为简捷．提高了公路凸型曲线计算、测设效率．为公路勘察设计增补了凸型曲线实用计算方法。
In this paper, the formulas of the length L 0 (0) of the curve and the radius R of the circular curve are deduced in detail. Highway convex curve calculation is simple. Improve the highway convex curve calculation, measuring efficiency. For highway survey and design added convex curve practical calculation method.