What requirements should longitudinal slope design meet?

(1) The design of longitudinal slope must meet the provisions on longitudinal slope in Technical Standards for Highway Engineering. (2) In order to ensure traffic safety, the longitudinal slope should have certain smoothness, and the ups and downs should not be too big or too frequent. Try to avoid using the limit slope value. The longitudinal slope where roads pass in mountainous areas should be slowed down as much as possible. When going uphill or downhill continuously, avoid going downhill as much as possible. (3) Natural conditions such as topography, soil geology, hydrology and climate along the longitudinal slope should be considered comprehensively. And deal with it according to the specific situation, so as to ensure the stability of subgrade and smooth road traffic to the maximum extent. (4) The balance of filling and excavation is an important control factor in longitudinal slope design, so as to reduce the borrower, save earthwork and other quantities and reduce the project cost. (5) When designing the longitudinal slope, we should fully consider the needs of irrigation and water conservancy, and try our best to take care of the requirements of transportation conditions such as local folk means of transportation and agricultural machinery; (6) Minimize the impact on the ecological environment. modify