关键词: 复曲线, 曲线半径, 辅助导线, 公路路线设计, 回头曲线, 平曲线最小长度, 圆曲线, 偏角法, 上定, 切线长

Abstract: If the compound curve is appropriate for the road line and it can not be designed with general compound curve, because of the objective conditions, we may use design of special compound curve. #br#This paper has derived the "Jia-Lin" formula which describes the character of special compound curve and the law of development for it. This formula can be used in the design of general compound curve too. At the same time this paper provides a simple procedure which can be used in the road construction.