SO this paper rely on Zhu-Xin express highway and divides the area that is encircled by AC13 AK13 SMA13 SAC13 into five small areas so we have six gradations.

• 为此,本文以京珠高速公路驻马店至信阳路段为依托,把AC13、AK13、SMA13、SAC13级配曲线所包围的区域细分成5个小区域,从而得到6条级配曲线。