互通立交桥是城市快速路系统的重要组成部分，其通行能力直接影响到快速路主线的服务水平以及快速路疏散、分流城市交通的能力。

Interchange is an important part of urban expressway system, whose capacity has immediate influence on the level of service of expressway and the ability of evacuating urban traffic.

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第五步：看看第三条主线，一般是从水平线倾斜到垂直线，也就是生命线。

Step 5: Examine the third major line, which usually slopes from horizontal to vertical, the life line.

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该计算方法以快速路主线车道数、主线流量、出入口流量、辅道流量为输入条件，计算满足一定服务水平下的出入口最小间距值。

Using expressway's number of lanes and traffic volume, and volumes on entrance, exit, and service road as input, the methods gives the minimum separation distance based on the given level of service.

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