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.
并运用单纯形方法对各规划年度的公路网等级结构进行了优化，通过综合分析得出客运需求高于货运的结论。
The grade structure of a road network in annual planning is optimized with the simplex method. Conclusions are reached through synthetic analysis.
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