Main control points: (Zhejiang) Zhoushan (Putuo), Ningbo, Cixi, Shangyu, Lin 'an, (Anhui) Ningguo, Xuancheng, Wuhu, Chaohu, Dingyuan, Fengyang, Bengbu, Huaiyuan, Mengcheng, Lixin, Jieshou, (Henan) Shenqiu, Xiangcheng, Shangshui, Luohe, Yexian and Lulu.
National highway refers to the main trunk highways with national political and economic significance, including important international highways and national defense highways, highways connecting the capital with the capitals of provinces, autonomous regions and municipalities directly under the Central Government, and highways connecting major economic centers, port hubs, commodity production bases and strategic locations. Inter-provincial highways in national highways are built, maintained and managed by specialized agencies approved by the Ministry of Communications.
National highways in China are numbered by numbers, which can be divided into four ways. One way is radial, and the sorting of these expressways begins with the word "1". The second category is the north-south direction, starting with the word "2"; The third category is east-west, starting with "3", and the fourth category is "five vertical and seven horizontal" trunk lines, starting with "0".