(1) it should enable the alignment of the driver's line of sight naturally to the driver's attention, and maintain the continuity of the vision.(2) the combination of plane, longitudinal and cross section limit values should be avoided.(3) plane and vertical plane alignment should be corresponding to each other, and the size of technical index is balanced and continuous and the balance and continuity of the technical indexes of the adjacent sections.(4) the condition is limited by the choice of plane, vertical section of the close or the maximum, minimum and combination, should be taken into consideration before and after the terrain, the use of technical indicators, such as the impact of the actual operating speed.(5) the transverse and longitudinal slopes should be combined properly, and should be conducive to the safety of road drainage and road traffic.
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