1 should choose a larger vertical curve radius. Vertical curve design, the first to determine the appropriate radius. Not too much in the increase of the number of projects under the condition of suitable vertical curve radius is bigger, generally should use a value greater than the general minimum radius of vertical curve, especially algebra two adjacent longitudinal slope difference before and after hours, the vertical curve should with large radius, in order to facilitate the vision and view of Lu Rongmei. Only when the terrain restrictions or other special difficulties may not have been allowed to use the limit of the minimum radius.2 the same curve should avoid "broken curve". In the same direction, the vertical curve, especially in the vertical curve of the same direction, is not long, and it should be combined into a single curve.3 between the reverse curve, generally straight slope section of the continuous, can also be directly connected to each other. A straight slope section is arranged between the reverse vertical curve, and the length of the straight slope section is generally not less than the length of the travel time of the 3S time of the traveling speed. If the conditions can also be directly connected to each other, after the insertion of a short straight line.4 should meet the requirements of drainage.
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