General requirements for longitudinal slope design1. let the design meets the provisions of the standard, in general do not use limits2. based on the longitudinal stress to be gentle at the same time, reduce the continuous steep, long steep slopes and slope3. linear continuous, smooth, balanced, and reasonable combination of horizontal and vertical alignmentAccording to cars driving on the highway, with its comfortable vision, we are to avoid to do the following:Traveling short distances, should avoid the ups and downs, don't let the visually impaired;In the drive hollow road, driver easy to visually impaired, affected his driving safety and driving speed.Uphill in a row, shaking longitudinal slope to put at the bottom, the top surface to slow, small longitudinal changes.Longitudinal section shaped design should note and plane shaped of relationship, vehicles road dedicated design, longitudinal slope design should combined along natural conditions integrated consider, with often requirements situation, Xia minimum longitudinal slope to not is less than 0.5%, for Yu road at of ditches, and drainage, in by flood effect of river route and the plain, speed sections should to guarantee route of minimum elevation, and ensure subgrade of stable;Used to reduce debit and waste as far as possible, make excavation for the nearest filling, saving earthwork, reducing construction cost;
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