Foreign vehicles do not enter Baiyin city, do not stay, bypass. Take the 109 national highway vehicle and bypass the 34 1 line. Vehicles hauling epidemic prevention and control materials and production and living materials enter and leave the urban area with "two codes and two certificates" (health code, boarding code, negative proof of nucleic acid detection within 24 hours, vehicle pass certificate issued by the medical material support group and traffic quarantine group of the county epidemic prevention and control leading group).