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；

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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。

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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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