The determination of the rational highway grade structure is one part of highway network planning, it also is an important content of highway network layout optimization.
公路网合理等级结构的确定，是公路网规划的组成内容之一，也是公路网布局优化的重要组成内容之一。
The determination of the rational highway grade structure is one part of highway network planning, it also is an important content of highway network layout optimization.
公路网合理等级结构的确定，是公路网规划的组成内容之一，也是公路网布局优化的重要组成内容之一。
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