Off ramp and suburban freeway and street terminal of a freeway interchange is a crucial component of crossroad for traffic flow transmitting, and an appropriate channelization design method is significant for the improvement of suburban freeway performance and capacity. The traffic flow characteristics and driver behaviors for an off ramp and street terminal of a suburban overpass freeway interchange were first analyzed based on investigation. Then, the channelization design methods of the off ramp~and streettermianl for a typical interchange was addressed in this paper.%互通立交出口匝道与地面道路衔接部是高速公路与地面衔接道路交通流转换的枢纽，研究其渠化设计方法对优化互通立交及其周边路网的交通流运行状态，提高区域路网服务水平具有重要的意义。本文首先在现场调查的基础上，分析了上跨式互通立交出1：3匝道与地面道路衔接部的交通流运行特性，然后提出了典型互通立交出口匝道与地面道路衔接部的渠化设计方法。
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