For highway, cement concrete surface quality assessment can be used three meters straightedge method to test pavement flatness, asphalt concrete surface is not allowed to use three meters straightedge method to test pavement flatness(对于高速公路，水泥混凝土面层质量评定可以用三米直尺法检测路面平整度，沥青混凝土面层不允许采用三米直尺法检测路面平整度)。