关键词: 公路竖曲线设计, 竖曲线长度, 公式推导, 停车视距

Abstract: The highway vertical curve design formulas for both crest and sag vertical curves with the consideration of stopping sight distance are first analytically derived. Driver height, object height, and vehicle headlamp height are explicitly considered as the key elements for stopping sight distance determination. Based on these formulas, the minimum vertical curve length values, as recommended in the China Road Alignment Design Guide are then shown to be inadequate, especially for crest vertical curve during nighttime operations with no illumination. It is suggested that vertical curve length design should consider the limitations of vehicle headlamps, and the recommended values in the China Road Alignment Design Guide should be increased.

Key words: highway vertical curve design , vertical curve length , derivation , stopping sight distance ;