通过对三个层次的评价，形成道路安全评价的体系。
By evaluating the three courses' safety condition, the system for road safety evaluation will be formed.
道路单元划分是建立道路安全评价方法的必要前提。
Dividing road cell is the necessary precondition to develop road safety evaluation method.
面层次的评价是指大区域内不同地区的道路安全评价。
The evaluation for sections and courses refers to the road safety evaluation to the different zones in the big areas.
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