一、简述路面平整度指标是公路路面单项质量评定的主要指标中的一个。我国以往一直是沿用三米直尺与相应的超差指标。它虽有仪具轻便、使用简单、价格便宜等优点,但是,它也有测量效率低,劳动强度大,精度差等严重弱点。而更重要的是三米直尺的间断超差指标存在着原理上的问题,即汽车行驶是连续的、运动的,而三米直尺超差指标则是 First, a brief description of the road surface roughness index is one of the main indicators of highway pavement quality assessment. In the past, China has always followed the three-meter ruler and the corresponding index of tolerance. Although it has the advantages of light weight, easy to use and low price, it has some serious weaknesses such as low measuring efficiency, labor intensity and poor precision. More importantly, there is a problem with the principle of intermittent overshooting of the three-meter ruler, that is, the driving of a car is continuous and sporty while the index of the three-meter ruler is