Chengdu-Mianyang expressway double-track project is an important part of Sichuan expressway planning network and the first expressway construction project for post-disaster reconstruction. Its main functions are: to meet the future traffic demand of Chengdu-Mianyang Corridor, to strengthen the economic radiation of Chengdu as a hub megacity to surrounding large and medium-sized cities, to strengthen regional economic ties, to promote economic development along the route, to incubate new industries and to form new industrial belts.