首先分析了路段和交叉口两种类型交通事故对路网的影响。

First, this paper analyzes the impacts of traffic accidents that occur both on street segments and within intersections.

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然后，提出了禁左交通效果评价的主要指标，分别考虑路段和交叉口两种情况。

Then, it investigates the most effective evaluation index of left-turning traffic forbiddance system, discusses of two cases a section of a road and an intersection, separately.

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然后在对路段和交叉口的运行可靠性分析的基础上，结合GO法来得到路网中各OD对子系统的可靠性指标值。

Based on the above reliability analysis of road section and intersection, the paper calculates all od pair subsystems reliability index value using GO methodology.

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