Adjustable slope is mainly based on

Adjustable slope is mainly based on the following two aspects: ⑴ combines selected lines with intent. Will try when considering the slope of the line and line selection compare, they should match. If any touch with reality or ill-considered, you should conduct a comprehensive analysis to find out the causes, the pros and cons, decide; b control standard. Detailed examination of maximum longitudinal slope design, slope length and gradient reduction and whether the combination of horizontal and vertical alignment in accordance with the requirements of technical standards, with particular attention to steep slopes and flat curve, vertical curve with the horizontal curves, bridge junction, the road intersection, the tunnel and the ferry terminal of reasonable local slope, identify problems and adjust the correction.
Adjust the grade line method to raise, lower, extend, shorten, longitudinal lines, and increase or decrease in longitudinal gradients and so on. Less adjustment should be based on the principle of out of control, fewer changes to fill, try to adjust the longitudinal slope and slope are equally matched.