交通流在平面交叉口区域形成冲突点、合流点和分流点，交通流在这些点的运行特性存在特殊性。
Traffic flow interweave mutually and bring out conflict points, merging points and diverging points in intersection area, which makes a great difference with that of basic segment of a highway.
互通式立体交叉是高速公路的重要组成部分，而互通式立交减速车道和分流点又是互通式交线形设计的重要指标。
Interchange is an important part of expressway, and the deceleration lane of interchanges and the diversion point are important indexes of alignment design of interchanges.
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