Photo taken on Dec. 17, 2018 shows the Taihang Mountain expressway in Xingtai, north China's Hebei Province. The Taihang Mountain expressway linking Hebei with Beijing started operation Friday. The expressway, with a total length of 650 km, connects Hebei's mountainous region with the capital and its neighboring provinces including Shanxi and Henan, benefiting a total of 7.4 million people living in the mountainous areas. (Xinhua/Yang Shiyao)