Becaue of the locality and flexibility of B-spline, this method not only makes the treat of the constraint conditions very smart, and simulates intelligently the manull design of vertical alignment as well.

• 用这种方法作纵断面设计,不仅使约束条件的处理极其灵巧,而且可以进行人工拉坡定线的智能模拟,设计出符合习用的纵断面线形。