Because the line is controlled by persons, errors are easily produced in the vertical direction, causing errors of the highway line and width.
由于人工掌握路线,竖直方向容易产生误差,进而引起公路线形和宽度有误差;
2
Sometimes it is considered that the increasing of highway cross-section width is helpful for highway safety, so some wider highways are built, especially in plain areas.
In the construction of the highway project, the highway line is generally controlled by the middle stakes and the width of highway is measured with a steel ruler from the middle stakes to both sides.