1. Number of lanes: G6 expressway with 6 lanes and G7 expressway with 4 lanes.

2. Route length: The total length of G6 Expressway is about 3,724 kilometers, starting from Beijing and ending in Lhasa, Xizang Autonomous Region, passing through seven provinces including Beijing, Hebei, Inner Mongolia, Ningxia, Gansu, Qinghai and Tibet. The total length of G7 Expressway is about 2,540 kilometers, starting from Beijing and ending in Urumqi, Xinjiang, passing through Beijing, Hebei, Shanxi, Inner Mongolia, Gansu and Xinjiang.

3. Organizational meaning: G7 is also the abbreviation of G7. Its member countries include the United States, Britain, France, Germany, Japan, Italy and Canada. Founded in 1973, G7 is an international economic alliance composed of seven western industrial countries.