Construction mileage: K88+958.82 ~ K96+600
With the total length of 97.7km, Simao ~ Xiaomengyang Expressway is a section of Chongqing ~ Kunming Expressway (M51), one of the nine longitudinal ways in the planned national “7918” expressway network as well as the first demonstration expressway in China crossing tropical rainforest. When inspecting Simao ~ Xiaomengyang Expressway, Secretary-General Hu Jintao favorably commented that “as long as the idea of scientific development is carefully implemented, we may realize not only win-win in development and environmental protection, but also completely harmonious coexistence of man and nature”. The project was commenced on June 20, 2003 and open to traffic on April 6, 2006. The project was awarded the National Superior Project Silver Medal.