通过大量的交通调查 ,对成绵高速公路建成通车以来的运营情况进行了后评价。分析了实际交通量与预测值产生偏差的主要原因 ,研究确定了道路的服务交通量和服务水平 ,并计算了有关运营情况的指标。对高速公路后评价理论与方法的不断完善和成绵高速公路的后评价工作具有一定的指导意义。 Through a large number of traffic surveys, the operation of Chengmian Expressway since its completion and opening to traffic has been post-evaluated. The main causes of deviation of actual traffic volume from the predicted value are analyzed. The service traffic volume and service level of the road are determined and the indicators about the operation are calculated. It is instructive to improve the theories and methods of expressway post-evaluation and the post-evaluation of Cheng-Mian Freeway.