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；
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.
一些传统观念认为，提高公路横断面要素指标有利于安全水平的提高，由此倾向于修建更宽的公路，这在平原区尤其明显。
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.
公路工程施工中，公路线形一般由中桩控制，公路宽度是用钢尺自中桩向两侧丈量。
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.
公路工程施工中，公路线形一般由中桩控制，公路宽度是用钢尺自中桩向两侧丈量。
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