省级干线公路在省公路网中具有重要的作用，因而其技术等级和技术标准一般不小于二级公路标准。当混合交通量较大时，可由双车道加两侧慢车道组成，宽度24.5米以下。
国省干线公路网络不断完善，连接了全国县级及以上行政区。
The national and provincial trunk highway network has been improved, connecting administrative regions at and above the county level nationwide.
本文首先根据调查统计数据，建立了河北省干线公路上载货车辆轴重分布模型；
First, the axle-load distribution model of heavy vehicles are constructed on the basis of statistical data.
通过对比分析数值得出辽宁省干线公路网络的分维数比较低，网络直通度比较高的结论。
The results have deminstrate that the Hausdorff fractal dimension is comparatively low and the space relation fractal dimension is high according to the ratio.
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