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每条公路将随着交通量的不断增长而逐级提高其技术等级,因而,有必要注意在远景发展中路型的衔接性,以便今后提高时可以最充分地利用原路。其中,纵断面和平面线形的局部改线毕竟是难以避免的,而绝大部分平直路段是可供利用的,故节约的关键是横断面型式能否便于利用。《公路工程技术标准(JTJ1-81)》规定二级路路面宽为9m及12m两种,一级路为2×7.5m且设中央分隔带。因而当二级路升级改建时,无论如何布置,原路中央部份及建筑物和两侧行道树等都不便利用,且施工
Each road will gradually increase its technical level as the volume of traffic increases. Therefore, it is necessary to pay attention to developing a road link in the long term so that the road can be fully utilized in the future. Among them, the longitudinal section and the plane line of the local line after the change is difficult to avoid, but most of the straight sections are available, so the key is saving the cross-section type can be easily utilized. “Highway Engineering and Technical Standards (JTJ1-81)” provides two road width of 9m and 12m two, a road for the 2 × 7.5m and set the central strip. Therefore, when upgrading and rebuilding of the secondary road, no matter what the layout, the central part of the original road and the buildings and the sidewalk trees are inconvenient to use and the construction