Description: With the opening and reform of further thorough, the people s living standards improved, the highway traffic tools more advanced, highway should have high speed, request comfortable, safe, economic and other requirements, so highway proud rapid development. At the same time as the rapid development of high grade highway, road surface flatness requirement for more and more high, road surface roughness of the qualified rate reflects both driving comfort levels, and they reflect the level of construction team. In highway construction, many factors can affect the road surface roughness, such as construction personnel quality, roadbed construction quality, the bridge culvert two paragraphs and bridge the expansion joint treatment, pavement subbase construction, and the road construction machinery choose and pavement materials quality, etc. Because the quality of highway in testing index, a very important index is flatness, it reflects the comprehensive use of the road performance, improve t
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