苜蓿叶形枢纽互通设置集散车道的必要性论证

由于全苜蓿叶或相邻象限设置环形匝道的部分苜蓿叶互通存在距离很近的相邻进出口,互通内主线存在交织区且交织长度短,交织车辆易对主线直行车辆造成影响。为提高主线的通行能力与行车安全,经验上一般在存在交织区的主线设置集散车道。考虑设置集散车道后,互通的占地与工程造价会较大幅度增加,设计阶段需对设置集散车道的必要性进行论证。利用美国《道路通行能力手册》（HCM2000）中对高速公路交织区通行能力的计算方法,介绍了全苜蓿叶枢纽互通是否需要设置集散车道的论证过程与方法。

Demonstration Procedure of its Necessity in Setting up Auxiliary Lanes in Cloverleaf Type Interchange

Because of its short distance of weaving sections which exist in cloverleaf type interchange,traffic flow in weaving sections affect the safety of major lanes' traffic flow.In order to increase the safety of traffic flow in major lanes,auxiliary lanes were been used as a matter of experience.However,the R-O-W and cost of cloverleaf type interchange were increased in vast scale with the addition of auxiliary lanes,so the necessity of setting auxiliary lanes need to be demonstrate in design stage.By the use o...