Abstract: Based on interchange ramp, this paper puts forward a method of interchange ramp elemetn i. e., disposing interchange into indepeadent ramp unit of each other by it.It is first used to make each ramp unit, then combine them into one, finally make interchange by proper editor.It is easy to make complex interchange system and to program.

Key words: interchange ramp element method, construction design, ramp unit, AutoLISP &, ADSRX system

摘要： 根据互通式立交匝道的特点,提出立交匝道线元法,即将复杂的立交分解为相互独立的匝道单元,利用AutoLISP和ADSRX系统生成各个匝道单元,再根据匝道的内在联系组合在一起,经过适当的剪辑,形成立交.利用这种方法可以生成复杂的立交系统,而且非常适宜编程.

关键词: 立交匝道线元法, 构造设计, 匝道单元, AutoLISP和ADSRX系统