The Spline Curve Study Of Highway Horizontal Alignment Design

As our social progress and economic development, rhe roads in integrated transport system played an increasingly important role. How developped of a local road is almost a direct impact on other aspects of the development of local. Highway designed and operation of the entire process played a key role because of the Line also as the backbone of highway designed. Our country is now the main design using linear design of the road alignment, the straight line, curve, vertical alignment, and other linear combination to achieve highway's alignment design.But in some places geometric layout and alignment are more difficult, the traditional linear design will appear some combination is not ideal, and poor coordination of adverse environmental factors. Thus providing a good linear design provides a beautiful environment, and it can guarantee the road with a reasonable technical and economical.This reality, combined with all the basic properties of splines, and after a formula comparing the characteristics of a variety of formulas to find the best of a spline curve, the Cardinal spline curve to the application of the road alignment design .This article provides a tCardinal spline curve on the road alignment design some of the specific methods, main contents and results are as follows.First, in many spline curve, through a variety of comparison to determine the nature of the Cardinal spline Why we choosed the road alignment design of the application. Second, the tension in the choice of how to determine the spline curve for each point on the curve to solve the curve radius of curvature high corners, widening and other issues and to calculate the coordinates of the error precision.Third, using the Cardinal spline curve on the road horizontal and vertical sections of a number of specific design aspects.Fourth, the use of how to calculate the Cardinal spline curve of the control points in the pile coordinates, the coordinates of the side stake i and the corresponding stake. KEY WORDS: cardinalspline curve,the road alignment design,...