高速公路的选线一般分三步进行,首先在初步规划中确定路线的范围(可称为路线规划带);其次,在选线阶段确定路线的基本位置;最后,通过线形设计确定路线的最终位置。其中对确定路线位置影响最大的则是选线工作。在地形变化较大的山区,路线位置主要用1/5,000的地形图选定,局部路线的调整可 The highway route selection is generally divided into three steps. First, the scope of the route is defined in the preliminary planning (which may be called the route planning zone). Secondly, the basic position of the route is determined during the route selection stage. Finally, the final design of the route position. One of the most influential to determine the location of the route is the line selection work. In mountainous areas where the terrain changes greatly, the location of the route is mainly selected by a 1 / 5,000 topographic map, and the adjustment of the local route may be